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Operando characterization of the internal multi-fields of industrial-scale fuel cells and mechanistic insight 认领 引用
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作者 Weichen Ji Xin Cai +3 位作者 Yunyang Ma Xin Liu Andreas Friedrich Rui Lin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第3期667-675,共9页
Despite significant progress in fuel cell technology,its large-scale industrial application is still challenged by the frequently encountered performance failure during long-term operation.Clarifying the failure mecha... Despite significant progress in fuel cell technology,its large-scale industrial application is still challenged by the frequently encountered performance failure during long-term operation.Clarifying the failure mechanism is the key to extending the lifecycle and enhancing stability.Herein,we have developed a time and space resolved multi-field characterization,including electrochemical impedance spectroscopy,to unveil its underlying mechanism.With this operando and non-destructive characterization,the dynamic evolution of the internal mass transport,heat,and electricity field distribution is fully depicted within an industrial-scale fuel cell in operation.Thus,it is revealed that hydrogen starvation occurs in the outlet region due to the excessive hydrogen consumption during the loading-down process.This can induce local low current density and carbon corrosion,which may subsequently cause severe damage to the structure of the catalyst layer and membrane,ultimately leading to performance failure.With this understanding,we further identify a descriptor for early diagnosis to prevent any potential degradation.The methodology is of significance,which can bring fuel cell technology a step further towards industrial applications. 展开更多
关键词 Operando characterization Internal multi-fields Industrial-scale fuel cell Local Electrochemical impedance spectroscopy Stability mechanism
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Mass Transfer Modeling in Pervaporation Based on Multi-fields Synergy Theory 认领 引用 被引量：6
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作者 雷震 吴莹莹 +1 位作者 路士庆 杨伯伦 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2008年第1期79-83,共5页
Toprovide a theoretical basis for optimizing the pervaporation procedure, a mass transfer model for pervaporation for binary mixtures was developed basedon the multi-fields synergy theory. This model used the mechanis... Toprovide a theoretical basis for optimizing the pervaporation procedure, a mass transfer model for pervaporation for binary mixtures was developed basedon the multi-fields synergy theory. This model used the mechanism of sorption-diffusion-desorption and introduced a diffusion coefficient, which was dependent on the feed concentration and temperature. Regarding the strong coupling effect in the mass transfer, the concentration distribution in membrane was predicted using the Flory-Huggins thermodynamic theory. The batch experiments and other experiments with constant composition-were conducted-using a modified chitosan pervaporatioffmembrane to separate tert-butyl alcohol （TBA）-water mixtures. The parameters of the mass transfer model were obtained from the flux of the experiments with a constant composition and the activity coefficients available through phase equilibrium equation, using the Willson equation in the feed side and the Flory-Huggins thermodynamic theory within the membrane The simulation results of the experiments .are in good agreement with the results, of the experiments. 展开更多
关键词 pervaporatlon membrane mass transter model multi-fields synergy theory coupling effect
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Building Digital Twin for 3D Multi-Field Reconstruction and Optimization of Industrial-Scale Combustion Systems 认领 引用
3
作者 Linzheng Wang Yaojun Li Sili Deng 《Engineering》 SCIE EI CSCD 2026年第4期197-214,共18页
In pursuit of a low-carbon energy transition,biomass and other carbon-neutral fuels are increasingly utilized in modern combustion facilities.However,controlling these systems remains challenging due to their complex ... In pursuit of a low-carbon energy transition,biomass and other carbon-neutral fuels are increasingly utilized in modern combustion facilities.However,controlling these systems remains challenging due to their complex geometries,dynamic interactions,and diverse operating conditions.Data-driven digital twins have emerged as powerful tools for optimizing performance and minimizing emissions in industrial combustion systems.Their core functions include reconstructing multi-physical combustion fields and predicting and optimizing key performance metrics,such as efficiency and pollutant emissions.Despite recent advancements,existing approaches typically treat reconstruction and optimization as separate tasks,limiting their efficiency and scalability.Furthermore,developing digital twins for real-world industrial applications requires extensive high-fidelity data,which is often impractical to obtain.To address these limitations,we propose the multi-field reconstruction net(MFRNet)framework,which integrates dimension expansion,variable extension,and feature fusion techniques to enhance data efficiency and predictive accuracy.Using an industrial-scale biomass grate furnace as a case study,we construct a comprehensive dataset,consisting of 288 low-fidelity 2D cases(covering eight physical fields)and 48 high-fidelity 3D cases(covering eleven physical fields).The MFRNet achieves high-precision multi-field reconstruction under complex conditions while significantly reducing the reliance on costly 3D simulations.By leveraging intermediate features pre-trained during reconstruction,the model enhances scalar predictions,notably improving CO and NO emission accuracy,even with limited high-fidelity data.The trained model is then directly applied for multi-objective optimization under varying operating conditions,demonstrating robust predictive accuracy and reliable optimization guidance.This scalable and data-efficient digital twin framework is easily adapted for other combustion systems,offering an intelligent paradigm for active control,real-time optimization,and enhanced operational efficiency in modern combustion facilities. 展开更多
关键词 Digital twin Multi-field reconstruction Multi-objective optimization Biomass combustion Machine learning
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Photovoltaic effects of Sm/Co-modified BNKT ferroelectric semiconductor ceramics under tunable multi-fields 认领 引用 被引量：1
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作者 Shanmingg Yang Baohua Zhu +7 位作者 Changlai Yuan Qingyuan Gao Xiao Liu Jingtai Zhao Changrong Zhou Jiwen Xu Guanghui Rao Wen Lei 《Journal of Advanced Ceramics》 SCIE EI CAS CSCD 2025年第6期55-66,共12页
Recent studies have highlighted the significant influence of external electric fields on the photovoltaic effects of ferroelectric materials.Here,the ferroelectric semiconductor(1-x)Bi0.5Na0.4K0.1TiO3-xSmC... Recent studies have highlighted the significant influence of external electric fields on the photovoltaic effects of ferroelectric materials.Here,the ferroelectric semiconductor(1-x)Bi0.5Na0.4K0.1TiO3-xSmCoO3(abbreviated as xmCo,where x ranges from 0.00 to 0.1)was synthesized using the solid-state method,achieving a narrowed optical band gap of 2.20-3.09 eV.Under the combined action of electric and light fields,the short-circuit photocurrent density(Jsc)increases from 44 to 269 nA·сm-2.When thermal fields are also applied,Jsc.further rises to 924 nA·cm-2.However,the appllcation of additional mechanical or magnetic fields reduces Jto 165 and 92 nA cm-2,respectively.The mixed valence states of Co2+/Co3+introduce a high density of oxygen vacancies,facilitating band gap narrowing.The substitution of Sm3+ions at the A-site preserves the ferroelectric properties.In ferroelectric ceramics,the remnant polarization(P)establishes a strong internal electric field,which is crucial for photo-induced charge carrier dynamics.Thesefindings demonstrate that external fields-light,electric,thermal,mechanical,and magnetic-affect spontaneous polarization strength,internal field stability,and charge carrier transitions within the electronic bands.This study provides new insights into the interplay of multiple field interactions and their effects on the photovoltaic properties(Usc/Vo)of ferroelectric oxide materials. 展开更多
关键词 multi-field actions photovoltaic effect Bi0.5Na0.4K0.1TiO3(BNKT)ceramics ferroelectric semiconductors
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Progress on Multi-Field Coupling Simulation Methods in Deep Strata Rock Breaking Analysis 认领 引用 被引量：3
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作者 Baoping Zou Chenhao Pei +3 位作者 Qizhi Chen Yansheng Deng Yongguo Chen Xu Long 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第3期2457-2485,共29页
The utilization of multi-field coupling simulation methods has become a pivotal approach for the investigation of intricate fracture behavior and interaction mechanisms of rock masses in deep strata.The high temperatu... The utilization of multi-field coupling simulation methods has become a pivotal approach for the investigation of intricate fracture behavior and interaction mechanisms of rock masses in deep strata.The high temperatures,pressures and complex geological environments of deep strata frequently result in the coupling of multiple physical fields,including mechanical,thermal and hydraulic fields,during the fracturing of rocks.This review initially presents an overview of the coupling mechanisms of these physical fields,thereby elucidating the interaction processes ofmechanical,thermal,and hydraulic fields within rockmasses.Secondly,an in-depth analysis ofmulti-field coupling is conducted from both spatial and temporal perspectives,with the introduction of simulation methods for a range of scales.It emphasizes cross-scale coupling methodologies for the transfer of rock properties and physical field data,including homogenization techniques,nested coupling strategies and data-driven approaches.To address the discontinuous characteristics of the rock fracture process,the review provides a detailed explanation of continuousdiscontinuous couplingmethods,to elucidate the evolution of rock fracturing and deformationmore comprehensively.In conclusion,the review presents a summary of the principal points,challenges and future directions of multi-field coupling simulation research.It also puts forward the potential of integrating intelligent algorithms with multi-scale simulation techniques to enhance the accuracy and efficiency of multi-field coupling simulations.This offers novel insights into multi-field coupling simulation analysis in deep rock masses. 展开更多
关键词 Multi-field coupling numerical simulation multi-scale information transfer discontinuity
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Analysis of multi-field coupling behaviors of sandwich piezoelectric semiconductor beams under thermal loadings 认领 引用 被引量：1
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作者 Dejuan KONG Zhuangzhuang HE +1 位作者 Chengbin LIU Chunli ZHANG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第8期1571-1590,共20页
Sandwich piezoelectric semiconductor(PS)structures have significant applications in multi-functional semiconductor devices.The analysis of multi-field coupling behaviors of PS structures is of fundamental importance i... Sandwich piezoelectric semiconductor(PS)structures have significant applications in multi-functional semiconductor devices.The analysis of multi-field coupling behaviors of PS structures is of fundamental importance in developing novel PS devices.In this paper,we develop a general temperature-deformation-polarization-carrier(TDPC)coupling model for sandwich-type PS beams involving pyroelectricity under thermal loadings,based on three-dimensional(3D)basic equations of the thermo-piezoelectric semiconductor(TPS).We derive analytical solutions for extensional,bending,and buckling deformations of simply-supported sandwich n-type PS beams subjected to open-circuit and electrically isolated boundary conditions.The accuracy of the proposed model in this paper is verified through finite element simulations implemented in the COMSOL software.Numerical results show that the initial electron concentration and the thickness ratio of the PS layer to the beam's total thickness have a significant effect on thermally induced extensional and bending responses,as well as critical buckling mechanical and thermal loadings.This study provides a theoretical framework and guidance for designing semiconductor devices based on sandwich PS beam structures. 展开更多
关键词 piezoelectric semiconductor(PS) sandwich beam multi-field coupling behavior critical buckling thermal loading analytical solution
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Insights into the intelligent multi-field response of nonlinear permittivity in the canonical antiferroelectric ceramics 认领 引用
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作者 Yizheng Bao Xuefeng Chen +4 位作者 Kunjie Lou Canyu Che Fei Cao Shiguang Yan Genshui Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第1期10-17,共8页
Due to the atomic-level centrosymmetric spontaneous polarization,antiferroelectric materials exhibit a sensitively nonlinear capacitive response to plural physic fields(mainly electric field and temperature)in a certa... Due to the atomic-level centrosymmetric spontaneous polarization,antiferroelectric materials exhibit a sensitively nonlinear capacitive response to plural physic fields(mainly electric field and temperature)in a certain range,consequently leading to some superb material properties,e.g.,ripple suppression,elec-trocaloric cooling,and dielectric energy storage.However,there are many cognitive blanks about how this exotic multi-field relationε(EDC,T)is influenced and manipulated via microscopic structures in the anti-ferroelectrics.In this work,the classic antiferroelectric ceramics PLZT were selected to see this intelligent effect,based on a quad-parameterizedε(EDC)relation on the dependence of T.εrelations were studied under different material compositions,temperature,frequency,AC electric field,and DC electric field,re-vealing lattice/domain structure evolution and the underlying mechanism.The inherent phase stability,introduced random field,and hierarchical hysteresis states were found to co-dominate this multi-field nonlinear relation.This work would not only contribute to future progress in the current applications(ripple suppression/electrocaloric cooling/dielectric energy storage)but imply the possibility of co-sensing temperature and electric potential simply and smartly. 展开更多
关键词 Antiferroelectric ceramic Nonlinear permittivity Positive bias-field permittivity Multi-field response Temperature-electric potential co-sensing
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Thermo-hydro-mechanical coupling analysis of dynamic responses of green sandstone subjected to high-strain rates:Experimental study and damage-based modeling 认领 引用 被引量：1
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作者 Shi Liu Zewei Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期542-565,共24页
Deep rock engineering is affected by coupled thermo-hydro-mechanical(THM)-dynamic fields,necessitating the elucidation of the dynamic mechanical behavior and failure mechanisms.This study utilized a Multi-field Couple... Deep rock engineering is affected by coupled thermo-hydro-mechanical(THM)-dynamic fields,necessitating the elucidation of the dynamic mechanical behavior and failure mechanisms.This study utilized a Multi-field Coupled Controlled Split Hopkinson Pressure Bar(MCC-SHPB)system to elucidate the cross-scale dynamic responses of rocks and the boundaries of failure modes under THM coupling.Impact tests were conducted on green sandstone under coupled conditions of temperature(25℃-80℃),confining pressure(0-15 MPa),and seepage water pressure(0-15 MPa).Scanning electron microscopy(SEM)microstructural characterization and COMSOL Multiphysics numerical simulations were conducted,and a dynamic constitutive theoretical framework and failure-prediction methodology were established.We investigated the impact toughness index(It),dynamic modulus(Ed),dynamic triaxial compressive strength(TCSd),fragmentation degree(W),and failure modes of green sandstone under thermo-confining pressure-seepage-impact loading conditions.The key findings reveal that the(It)reflects different energy regulation mechanisms across different confining pressure regimes.Thermal-microcrack interactions dominate at low pressure,and energy absorption prevails at high pressure.A triphasic dynamic modulus model captures stiffness evolution under energy-driven conditions,revealing cross-scale crack nucleation-propagation and fragment reorganization.The TCSd inflection point signifies energy dissipation shifts,causing nonlinear skeleton bearing-capacity degradation.A critical criterion based on the W was established to distinguish between the two failure modes and predict the unstable failure initiation.Numerical simulations were used to elucidate the effects of inertia-dominated crack propagation and stress wave interference,validating the critical criterion and the predictive accuracy of the theoretical model during cross-scale failure.This study provides a theoretical foundation for assessing the dynamic stability of rock masses subjected to multi-field coupling during deep resource exploitation. 展开更多
关键词 Multi-field coupled controlled split Hopkinson pressure bar(MCC-SHPB) Impact toughness index Modulus evolution model Fragmentation degree Thermo-hydro-mechanical failure criterion
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Numerical Simulation of Damage Behavior in Graphene-Reinforced Aluminum Matrix Composite Armatures under Multi-Physical Field Coupling 认领 引用
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作者 Junwen Huo Haicheng Liang +1 位作者 Weiye Dong Xiaoming Du 《Computers, Materials & Continua》 SCIE EI 2026年第2期381-400,共20页
With the rapid advancement of electromagnetic launch technology,enhancing the structural stability and thermal resistance of armatures has become essential for improving the overall efficiency and reliability of railg... With the rapid advancement of electromagnetic launch technology,enhancing the structural stability and thermal resistance of armatures has become essential for improving the overall efficiency and reliability of railgun systems.Traditional aluminum alloy armatures often suffer from severe ablation,deformation,and uneven current distribution under high pulsed currents,which limit their performance and service life.To address these challenges,this study employs the Johnson–Cook constitutive model and the finite element method to develop armature models of aluminum matrix composites with varying heterogeneous graphene volume fractions.The temperature,stress,and strain of the armatures during operation were analyzed to investigate the effects of different graphene volume fractions on the deformation and damage behavior of aluminum matrix composite armatures under the multi-field coupling of electromagnetic,thermal,and structural interactions.The results indicate that,compared to the 6061 aluminum alloy matrix,the graphene-reinforced aluminum matrix composite armature significantly suppresses ablation damage at the tail and throat edges.The incorporation of graphene notably reduces the temperature rise during the armature emission process,increases the muzzle velocity under identical current excitation,and mitigates directional deformation of the armature.The 1 wt.% graphene-reinforced aluminum matrix composite armature demonstrates better agreement with experimental results at a strain rate of 2000 s-1,while simultaneously improving stress-strain response,reducing temperature rise,and improving velocity performance. 展开更多
关键词 Aluminum matrix composites multi-field direct coupling heterogeneous armature deformation
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Fluid Flow in Fractured Rocks:From Multiphysics Paradigms to AI-Driven Predictive Modeling 认领 引用
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作者 Zhuo Pan Lin Zhu +1 位作者 Yi Xue Hao Xu 《Fluid Dynamics & Materials Processing》 EI 2026年第2期42-105,共64页
Fluid flow through fractured rock masses is a key process controlling the safety and performance of deep geoengineering systems,shaped by the complex interactions of thermal,hydraulic,mechanical and chemical(THMC)fiel... Fluid flow through fractured rock masses is a key process controlling the safety and performance of deep geoengineering systems,shaped by the complex interactions of thermal,hydraulic,mechanical and chemical(THMC)fields.This paper presents a systematic review of this subject with special emphasis on the multi-physics governing it.First,we elucidate the interdependent mechanisms and governing equations,highlighting the nonlinear,path-dependent,and evolving nature of the relationship between stress and permeability.Next,mainstream modeling approaches,including equivalent continuum,discrete fracture network(DFN),and dual-porosity/dual-permeability methods,are critically evaluated,and a strategy for model selection based on project scale and geological context is proposed accordingly.Moreover,experimental insights from single-fracture and triaxial flow studies are synthesized,revealing how effective stress,shear displacement,and fracture roughness control permeability evolution.In particular,the practical significance of THMC coupling is demonstrated through case studies on nuclear waste disposal,Enhanced Geothermal Systems,and tunneling projects.The reviewfurther explores AI-and machine learning-driven innovations,particularly physics-informed neural networks and hybrid modeling,which address limitations in computational efficiency,data scarcity,and physical consistency.Finally,persistent challenges,including multi-scale coupling,parameter uncertainty,and complex fracture network representation are identified and critically discussed while paying attention to future developments. 展开更多
关键词 Fractured rock mass seepage flow multi-field coupling(THMC) DFN equivalent continuum model(ECM) AI ML PINN EGS geological disposal of nuclear waste
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Experimental research and numerical simulation of the multi-field performance of cemented paste backfill:Review and future perspectives 认领 引用 被引量：12
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作者 Yong Wang Zhenqi Wang +4 位作者 Aixiang Wu Liang Wang Qing Na Chen Cao Gangfeng Yang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第2期193-208,共16页
Cemented paste backfill(CPB)technology is a green mining method used to control underground goaves and tailings ponds.The curing process of CPB in the stope is the product of a thermo-hydro-mechanical-chemical multi-f... Cemented paste backfill(CPB)technology is a green mining method used to control underground goaves and tailings ponds.The curing process of CPB in the stope is the product of a thermo-hydro-mechanical-chemical multi-field performance interaction.At present,research on the multi-field performance of CPB mainly includes indoor similar simulation experiments,in-situ multi-field performance monitoring experiments,multi-field performance coupling model construction of CPB,and numerical simulation of the multi-field performance of CPB.Because it is hard to study the in-situ multi-field performance of CPB in the real stope,most current research on in-situ multi-field performance adopts the numerical simulation method.By simulating the conditions of CPB in the real stope(e.g.,maintenance environment,stope geometry,drainage conditions,and barricade and backfilling rates),the multi-field performance of CPB is further studied.This paper summarizes the mathematical models employed in the numerical simulation and lists the engineering application cases of numerical simulation in the in-situ multi-field performance of CPB.Finally,it proposes that the multi-field performance of CPB needs to strengthen the theoretical study of multi-field performance,form the strength design criterion based on the multi-field performance of CPB,perform a full-range numerical simulation of the multi-field performance of CPB,develop a pre-warning technology for the CPB safety of CPB,develop automatic and wireless sensors for the multi-field performance monitoring of CPB,and realize the application and popularization of CPB monitoring technology. 展开更多
关键词 cemented paste backfill multi-field performance in situ mathematic model numerical simulation
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From Stress Redistribution to Energy Accumulation:Lateral Pressure-Driven Chain Evolution in Gas-Bearing Coal 认领 引用
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作者 Wenqi Zheng Feng Gao +6 位作者 Hanpeng Wang Xin Wang Bing Zhang Yue Niu Wei Wang Li Ming Chunbo Zhou 《Fluid Dynamics & Materials Processing》 EI 2026年第4期172-194,共23页
As coal extraction advances to greater depths,a refined understanding of the coupled evolution of involved physical effects and mechanisms in gas-bearing coal under excavation-induced disturbances becomes indispensabl... As coal extraction advances to greater depths,a refined understanding of the coupled evolution of involved physical effects and mechanisms in gas-bearing coal under excavation-induced disturbances becomes indispensable.In this context,“chain evolution”characterizes the progressive and interdependent interplay among stress redistribution,damage propagation,and seepage adjustment.Building upon a seepage–stress–damage coupling model for gas-bearing coal,and supported by triaxial compression tests for validation,this study explores multifield evolution during roadway excavation across lateral pressure coefficients(ξ)of 0.5,0.8,1.0,1.2,and 1.5.The results reveal that the lateral pressure coefficient fundamentally regulates both the orientation and intensity of this coupled process by reshaping the initial stress regime and associated unloading constraints.At relatively low values(ξ1.2),damage localization and permeability enhancement are concentrated in the roof and floor,accompanied by pronounced vertical energy accumulation.These findings underscore that the lateral pressure coefficient not only governs the spatial distribution of individual physical fields but also orchestrates the pathways of their coupled evolution.The study thus provides a robust,mechanism-oriented basis for optimizing support design and implementing targeted hazard mitigation strategies in deep gas-bearing coal seams. 展开更多
关键词 Deep mining lateral pressure coefficient chained multi-field evolution differentiated hazard prevention numerical simulation
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Numerical analysis of stability for mined-out area in multi-field coupling 认领 引用 被引量：7
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作者 罗周全 谢承煜 +3 位作者 周吉明 贾楠 刘晓明 徐海 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第2期669-675,共7页
There were differences between real boundary and blast hole controlling boundary of irregular mined-out area in underground metal mines. There were errors in numerical analysis of stability for goaf, if it was analyze... There were differences between real boundary and blast hole controlling boundary of irregular mined-out area in underground metal mines. There were errors in numerical analysis of stability for goaf, if it was analyzed as regular 3D mined-out area and the influence of coupling stress-seepage-disturbance was not considered adequately. Taking a lead zinc mine as the background, the model was built by the coupling of Surpac and Midas-Gts based on the goaf model precisely measured by CMS.According to seepage stress fundamental equations based on the equivalent continuum mechanical and the theory about equivalent load of dynamic disturbance in deep-hole blasting, the stability of mined-out area under multi-field coupling of stress-seepage-dynamic disturbance was numerically analyzed. The results show that it is more consistent between the numerical analysis model based on the real model of irregular 3D shape goaf and the real situation, which could faithfully reappear the change rule of stress–strain about the surrounding rock under synthetic action of blasting dynamic loading and the seepage pressure. The mined-out area multi-field coupling formed by blasting excavation is stable. Based on combination of the advantages of the CMS,Surpac and Midas-Gts, and fully consideration of the effects of multi-field coupling, the accurate and effective way could be provided for numerical analysis of stability for mined-out area. 展开更多
关键词 mined-out area measured actually multi-field coupling stress-seepage-disturbance stability for mined-out area
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A technique for enhancing tight oil recovery by multi-field reconstruction and combined displacement and imbibition 认领 引用 被引量：6
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作者 LEI Zhengdong WANG Zhengmao +6 位作者 MU Lijun PENG Huanhuan LI Xin BAI Xiaohu TAO Zhen LI Hongchang PENG Yingfeng 《Petroleum Exploration and Development》 SCIE 2024年第1期152-163,共12页
A seepage-geomechanical coupled embedded fracture flow model has been established for multi-field coupled simulation in tight oil reservoirs,revealing the patterns of change in pressure field,seepage field,and stress ... A seepage-geomechanical coupled embedded fracture flow model has been established for multi-field coupled simulation in tight oil reservoirs,revealing the patterns of change in pressure field,seepage field,and stress field after long-term water injection in tight oil reservoirs.Based on this,a technique for enhanced oil recovery(EOR)combining multi-field reconstruction and combination of displacement and imbibition in tight oil reservoirs has been proposed.The study shows that after long-term water flooding for tight oil development,the pressure diffusion range is limited,making it difficult to establish an effective displacement system.The variation in geostress exhibits diversity,with the change in horizontal minimum principal stress being greater than that in horizontal maximum principal stress,and the variation around the injection wells being more significant than that around the production wells.The deflection of geostress direction around injection wells is also large.The technology for EOR through multi-field reconstruction and combination of displacement and imbibition employs water injection wells converted to production and large-scale fracturing techniques to restructure the artificial fracture network system.Through a full lifecycle energy replenishment method of pre-fracturing energy supplementation,energy increase during fracturing,well soaking for energy storage,and combination of displacement and imbibition,it effectively addresses the issue of easy channeling of the injection medium and difficult energy replenishment after large-scale fracturing.By intensifying the imbibition effect through the coordination of multiple wells,it reconstructs the combined system of displacement and imbibition under a complex fracture network,transitioning from avoiding fractures to utilizing them,thereby improving microscopic sweep and oil displacement efficiencies.Field application in Block Yuan 284 of the Huaqing Oilfield in the Ordos Basin has demonstrated that this technology increases the recovery factor by 12 percentage points,enabling large scale and efficient development of tight oil. 展开更多
关键词 tight oil complex fracture network energy increase by fracturing multi-field reconstruction displacement and imbibition combination EOR
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Multi-field coupling and free vibration of a sandwiched functionally-graded piezoelectric semiconductor plate 认领 引用 被引量：7
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作者 Xueqian FANG Qilin HE +1 位作者 Hongwei MA Changsong ZHU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第8期1351-1366,共16页
Sandwiched functionally-graded piezoelectric semiconductor(FGPS)plates possess high strength and excellent piezoelectric and semiconductor properties,and have significant potential applications in micro-electro-mechan... Sandwiched functionally-graded piezoelectric semiconductor(FGPS)plates possess high strength and excellent piezoelectric and semiconductor properties,and have significant potential applications in micro-electro-mechanical systems.The multi-field coupling and free vibration of a sandwiched FGPS plate are studied,and the governing equation and natural frequency are derived with the consideration of electron movement.The material properties in the functionally-graded layers are assumed to vary smoothly,and the first-order shear deformation theory is introduced to derive the multi-field coupling in the plate.The total strain energy of the plate is obtained,and the governing equations are presented by using Hamilton’s principle.By introducing the boundary conditions,the coupling physical fields are solved.In numerical examples,the natural frequencies of sandwiched FGPS plates under different geometrical and physical parameters are discussed.It is found that the initial electron density can be used to modulate the natural frequencies and vibrational displacement of sandwiched FGPS plates in the case of nano-size.The effects of the material properties of FGPS layers on the natural frequencies are also examined in detail. 展开更多
关键词 sandwiched piezoelectric semiconductor(PS)plate functionally-graded layer multi-field coupling free vibration Hamilton's principle
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A generalized multi-field coupling approach and its application to stability and deformation control of a high slope 认领 引用 被引量：6
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作者 Chuangbing Zhou Yifeng Chen +1 位作者 Qinghui Jiang Wenbo Lu 《Journal of Rock Mechanics and Geotechnical Engineering》 2011年第3期193-206,共14页
Human activities, such as blasting excavation, bolting, grouting and impounding of reservoirs, will lead to disturbances to rock masses and variations in their structural features and material properties. These engine... Human activities, such as blasting excavation, bolting, grouting and impounding of reservoirs, will lead to disturbances to rock masses and variations in their structural features and material properties. These engineering disturbances are important factors that would alter the natural evolutionary processes or change the multi-field interactions in the rock masses from their initial equilibrium states. The concept of generalized multi-field couplings was proposed by placing particular emphasis on the role of engineering disturbances in traditional multi-field couplings in rock masses. A mathematical model was then developed, in which the effects of engineering disturbances on the coupling-processes were described with changes in boundary conditions and evolutions in thermo-hydro-mechanical （THM） properties of the rocks. A parameter, d, which is similar to damage variables but has a broader physical meaning, was conceptually introduced to represent the degree of engineering disturbances and the couplings among the material properties. The effects of blasting excavation, bolting and grouting in rock engineering were illustrated with various field observations or theoretical results, on which the degree of disturbances and the variations in elastic moduli and permeabilities were particularly focused. The influences of excavation and groundwater drainage on the seepage flow and stability of the slopes were demonstrated with numerical simulations. The proposed approach was further employed to investigate the coupled hydro-mechanical responses of a high rock slope to excavation, bolting and impounding of the reservoir in the dam left abutment of Jinping I hydropower station. The impacts of engineering disturbances on the deformation and stability of the slope during construction and operation were demonstrated. 展开更多
关键词 generalized multi-field couplings engineering disturbance slope stability deformation control
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Analysis of a Water-Inrush Disaster Caused by Coal Seam Subsidence Karst Collapse Column under the Action of Multi-Field Coupling in Taoyuan Coal Mine 认领 引用 被引量：7
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作者 Zhibin Lin Boyang Zhang Jiaqi Guo 《Computer Modeling in Engineering & Sciences》 SCIE EI 2021年第1期311-330,共20页
Minin-induced water inrush from a confined aquifer due to subsided floor karst collapse column(SKCC)is a type of serious disaster in the underground coal extraction.Karst collapse column(KCC)developed in a confined aq... Minin-induced water inrush from a confined aquifer due to subsided floor karst collapse column(SKCC)is a type of serious disaster in the underground coal extraction.Karst collapse column(KCC)developed in a confined aquifer occurs widely throughout northern China.A water inrush disaster from SKCC occurred in Taoyuan coal mine on February 3,2013.In order to analyze the effect of the KCC influence zone’s(KCCIZ)width and the entry driving distance of the water inrush through the fractured channels of the SKCC,the stress,seepage,and impact dynamics coupling equations were used tomodel the seepage rule,and a numerical FLAC3D model was created to determine the plastic zones,the vertical displacement development of the rockmass surrounding the entry driving working face(EDWF),and the seepage vector and water inflow development of the seepage field.The hysteretic mechanism of water inrush due to SKCC in Taoyuan coal mine was investigated.The results indicate that a water inrush disaster will occur when the width of the KCCIZ exceeds 16 m under a driving,which leads to the aquifer connecting with the fractured zones of the entry floor.Hysteretic water inrush disasters are related to the stress release rate of the surrounding rocks under the entry driving.When the entry driving exceeds about 10 m from the water inrush point,the stress release rate reaches about 100%,and a water inrush disaster occurs. 展开更多
关键词 Karst collapse column multi-field coupling seepage mutation water-inrush
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Numerical Analysis on Multi-Field Characteristics and Synergy in a Large-Size Annular Combustion Chamber with Double Swirlers 认领 引用 被引量：2
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作者 Zaiguo Fu Huanhuan Gao +1 位作者 Zhuoxiong Zeng Jiang Liu 《Computer Modeling in Engineering & Sciences》 SCIE EI 2020年第3期805-830,共26页
In order to comprehensively evaluate the flow and heat transfer performance of a large-size annular combustion chamber of a heavy-duty gas turbine,we carried out numerical computation and analyses on the velocity,temp... In order to comprehensively evaluate the flow and heat transfer performance of a large-size annular combustion chamber of a heavy-duty gas turbine,we carried out numerical computation and analyses on the velocity,temperature and pressure fields in the chamber with double swirlers.The mathematical model of the coupling combustion,gas flow,and heat transfer process was established.The influences of the inlet swirling strength,fuel-air ratio and temperature of the premixed gas on the multi-field characteristics and synergy were investigated on the basis of field synergy theory.The results showed that the central recirculation zone induced by the inlet swirling flow grows downstream in the combustion chamber.The velocity and temperature in the outlet section of the chamber tend to be uniform due to the upstream improved synergy.The outer swirl number of the premixed gas flow has a great influence on the comprehensive flow and heat transfer performance of the combustion chamber.The synergy angles change towards benefiting the synergy between velocity and temperature fields with the increasing swirl numbers and inlet gas temperature while the velocity-pressure synergy becomes poor.The increasing fuel-air ratio of premixed gas leads to different trends of the velocity-temperature synergy and velocity-pressure synergy.The comprehensive synergy representing the low-resistance heat transfer performance is evidently dominated mainly by the velocity-temperature synergy. 展开更多
关键词 Annular combustor heat transfer multi-field synergy synergy angle swirling flow.
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Multi-field Coupling Simulation of Impact of Temperature and Density of Heat Injection Well on Carbon Budget during Hydrate Exploitation in Qilian Mountain Permafrost Region 认领 引用 被引量：1
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作者 Zhenhua Han Ruirui Li +2 位作者 Luqing Zhang Jian Zhou Song Wang 《Journal of Earth Science》 SCIE CAS CSCD 2024年第6期1934-1943,共10页
Permafrost regions of Qilian Mountains in China are rich in gas hydrate resources.Once greenhouse gases in deep frozen layer are released into the atmosphere during hydrate mining,a series of negative consequences occ... Permafrost regions of Qilian Mountains in China are rich in gas hydrate resources.Once greenhouse gases in deep frozen layer are released into the atmosphere during hydrate mining,a series of negative consequences occur.This study aims to evaluate the impact of hydrate thermal exploitation on regional permafrost and carbon budgets based on a multi-physical field coupling simulation.The results indicate that the permeability of the frozen soil is anisotropic,and the low permeability frozen layer can seal the methane gas in the natural state.Heat injection mining of hydrates causes the continuous melting of permafrost and the escape of methane gas,which transforms the regional permafrost from a carbon sink to a carbon source.A higher injection temperature concentrates the heat and causes uneven melting of the upper frozen layer,which provides a dominant channel for methane gas and results in increased methane emissions.However,dense heat injection wells cause more uniform melting of the lower permafrost layer,and the melting zone does not extend to the upper low permeability formation,which cannot provide advantageous channels for methane gas.Therefore,a reasonable and dense number of heat injection wells can reduce the risk of greenhouse gas emissions during hydrate exploitation. 展开更多
关键词 permafrost gas hydrates carbon budget methane emissions greenhouse gases environmental effects multi-field coupling simulation
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Drift characteristics and the multi-field coupling stress mechanism of the pantograph-catenary arc under low air pressure 认领 引用 被引量：1
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作者 许之磊 高国强 +6 位作者 钱鹏宇 肖嵩 魏文赋 杨泽锋 董克亮 马亚光 吴广宁 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第4期493-503,共11页
The fault caused by a pantograph-catenary arc is the main factor that threatens the stability of high-speed railway energy transmission.Pantograph-catenary arc vertical drift is more severe than the case under normal ... The fault caused by a pantograph-catenary arc is the main factor that threatens the stability of high-speed railway energy transmission.Pantograph-catenary arc vertical drift is more severe than the case under normal pressure,as it is easy to develop the rigid busbar,which may lead to the flashover occurring around the support insulators.We establish a pantograph-catenary arc experiment and diagnosis platform to simulate low pressure and strong airflow environment.Meanwhile,the variation law of arc drift height with time under different air pressures and airflow velocities is analyzed.Moreover,arc drift characteristics and influencing factors are explored.The physical process of the arc column drifting to the rigid busbar with the jumping mechanism of the arc root on the rigid busbar is summarized.In order to further explore the mechanism of the above physical process,a multi-field stress coupling model is built,as the multi-stress variation law of arc is quantitatively evaluated.The dynamic action mechanism of multi-field stress on arc drifting characteristics is explored,as the physical mechanism of arc drifting under low pressure is theoretically explained.The research results provide theoretical support for arc suppression in high-altitude areas. 展开更多
关键词 pantograph-catenary arc low pressure multi-field stress coupling model arc column drift
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