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Surface Decontamination of Chemical Agent Surrogates Using an Atmospheric Pressure Air Flow Plasma Jet 认领 引用 被引量：3
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作者 李战国 李颖 +1 位作者 曹鹏 赵红杰 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第7期696-701,共6页
An atmospheric pressure dielectric barrier discharge （DBD） plasma jet generator using air flow as the feedstock gas was applied to decontaminate the chemical agent surrogates on the surface of aluminum, stainless st... An atmospheric pressure dielectric barrier discharge （DBD） plasma jet generator using air flow as the feedstock gas was applied to decontaminate the chemical agent surrogates on the surface of aluminum, stainless steel or iron plate painted with alkyd or PVC. The experi- mental results of material decontamination show that the residual chemical agent on the material is lower than the permissible value of the National Military Standard of China. In order to test the corrosion effect of the plasma jet on different material surfaces in the decontamination pro-cess, corrosion tests for the materials of polymethyl methacrylate, neoprene, polyvinyl chloride （PVC）, polyethylene （PE）, phenolic resin, iron plate painted with alkyd, stainless steel, aluminum, etc. were carried out, and relevant parameters were examined, including etiolation index, chroma- tism, loss of gloss, corrosion form, etc. The results show that the plasma jet is slightly corrosive for part of the materials, but their performances are not affected. A portable calculator, computer display, mainboard, circuit board of radiogram, and a hygrometer could work normally after being treated by the plasma jet. 展开更多
关键词 surface decontamination chemical agents atmospheric pressure plasma jet,dielectric barrier discharge （DBD） air flow dischargeDAF＇~. co ~ ＂
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Design and performance of air flow-assisted ionization imaging mass spectrometry system 认领 引用 被引量：3
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作者 Fei Tang Yi Chen +3 位作者 Jiu-Ming He Zhi-Gang Luo Zeper Abliz Xiao-Hao Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第5期687-692,共6页
The imaging mass spectrometry（IMS） technology has experienced a rapid development in recent years.A new IMS technology which is based on air flow assisted ionization（AFAI） was reported.It allows for the convenient... The imaging mass spectrometry（IMS） technology has experienced a rapid development in recent years.A new IMS technology which is based on air flow assisted ionization（AFAI） was reported.It allows for the convenient pretreatment of the samples and can image a large area of sample in a single measurement with high sensitivity.The AFAI in DESI mode was used as the ion source in this paper.The new IMS method is named AFADESI-IMS.The adoption of assisted air flow makes the sample pretreatment easy and convenient.An optimization of the distance between the ion transport tube and MS orifice increases the sensitivity of the system.For data processing,a program based on MATLAB with the function of numerical analysis was developed.A theoretical imaging resolution of a few hundred microns can be achieved.The composite AFAI-IMS images of different target analytes were imaged with high sensitivity.A typical AFAI-IMS image of the whole-body section of a rat was obtained in a single analytical measurement.The ability to image a large area for relevant samples in a single measurement with high sensitivity and repeatability is a significant advantage.The method has enormous potentials in the MS imaging of large and complicated samples. 展开更多
关键词 Imaging mass spectrometry Air flow assisted ionization imaging mass spectrometry Whole-body imaging Large and complicated sample imaging
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Vacuum and Air Flow for 2QXP-1 Vacuum Precision Seed Metering 认领 引用 被引量：2
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作者 Su Wei Wang Fu-lin +1 位作者 Chen Hai-tao Lai Qing-hui 《Journal of Northeast Agricultural University(English Edition)》 CAS 2013年第2期61-64,共4页
Vacuum precision seed metering is the key part of vacuum seed planter. Planting performance of planter is affected by vacuum and air flow which are important parameters for choosing fan. Effects of qualification perce... Vacuum precision seed metering is the key part of vacuum seed planter. Planting performance of planter is affected by vacuum and air flow which are important parameters for choosing fan. Effects of qualification percent and miss percent on air chamber vacuum 3, 4, 5 and 6 kPa were studied at different operating speeds. The results showed that operating performance of the seed metering was excellent when air chamber vacuum was 5 and 6 kPa, which air flow was 7.4-8.0 m3·s-1 and 8.0-8.8 m3·s-1 , respectively. 展开更多
关键词 seed planter precision seed metering vacuum degree air flow
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Air flow control based on optimal oxygen excess ratio in fuel cells for vehicles 认领 引用 被引量：1
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作者 Ai Guo Weirong Chen +2 位作者 Qi Li Zhixiang Liu Haidan Que 《Journal of Modern Transportation》 2013年第2期79-85,共7页
Air flow control is one of the most important control methods for maintaining the stability and reliability of a fuel cell system,which can avoid oxygen starvation or oxygen saturation.The oxygen excess ratio(OER)is o... Air flow control is one of the most important control methods for maintaining the stability and reliability of a fuel cell system,which can avoid oxygen starvation or oxygen saturation.The oxygen excess ratio(OER)is often used to indicate the air flow condition.Based on a fuel cell system model for vehicles,OER performance was analyzed for different stack currents and temperatures in this paper,and the results show that the optimal OER was affected weakly by the stack temperature.In order to ensure the system working in optimal OER,a control scheme that includes an optimal OER regulator and a fuzzy control was proposed.According to the stack current,a reference value of air flow rate was obtained with the optimal OER regulator and then the air compressor motor voltage was controlled with the fuzzy controller to adjust the air flow rate provided by the air compressor.Simulation results show that the control method has good dynamic and static characteristics. 展开更多
关键词 Fuel cells Oxygen excess ratio Air flow Fuzzy control
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Air flow calculation of reverse circulation drilling technique with air DTH hammer 认领 引用 被引量：1
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作者 HUANG Yong ZHU Lihong +1 位作者 YIN Kun BO Kun 《Global Geology》 2010年第3期165-170,共6页
Air DTH hammer has been successfully applied in minor-caliber solid mineral exploration,water-well drilling and other drilling areas. In order to expand the applications of the technology,the authors further studied t... Air DTH hammer has been successfully applied in minor-caliber solid mineral exploration,water-well drilling and other drilling areas. In order to expand the applications of the technology,the authors further studied the principle and analyzed the mechanism of reverse circulation drilling technique with air DTH hammer to get the perfect assembles of equipments by optimizing working parameters. No parameter seemed more important than the air volume because it could maintain the working performance stability. The minimum air volume is related to the parameters such as depth and pressure,which was calculated under the actual conditions. It was solved for the air injection flow tables of the air DTH Hammer working at the different pressures. According to the data tables,operators could adjust the air volume to meet the demand on this technique,which had a realistic guiding significance. So it could build up a set of systematic and complete hi-technique. 展开更多
关键词 air DTH Hammer reverse circulating bit CFD simulation derivation equation air flow calculation
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Influence of Air Flow Rate on Functional Evaluation of Semicircular Canals 认领 引用
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作者 WANG Li-zhi LIU Dong-liang MA Xiu-lan 《Journal of Otology》 CAS 2010年第2期101-103,共3页
Objective To study the influence of unilateral air flow rate change on the result of caloric test.Materials and Methods The unilateral weakness(UW) index was calculated when the air flow rate was set at 6 L /min in bo... Objective To study the influence of unilateral air flow rate change on the result of caloric test.Materials and Methods The unilateral weakness(UW) index was calculated when the air flow rate was set at 6 L /min in both ears(called symmetric stimulation) and again when it was set at 6 L /min in left ear and 3 L /min in the right ear(called asymmetric stimulation).Each individual subject was tested with both symmetrical and asymmetrical stimulations.Paired t test was used to examine the differences between results from symmetrical and asymmetrical stimulations.Result UW index decreased in response to asymmetrical stimulation.Conclusion Unilaterally decreased air flow rate can produce indices suggesting ipsilateral UW,which can be misleading. 展开更多
关键词 caloric test air flow rate
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A CFD study on optimal venting volume and air flow distribution in a special designed hood system for controlling dust flow 认领 引用 被引量：5
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作者 Song Gaoju Yang Lei Shen Henggen 《China Foundry》 SCIE CAS 2011年第3期316-320,共5页
A novel hood structure has been designed for the dust control system in the foundry in order to improve the working environment. A composite strategy has been applied for comparative analysis of the optimal venting vo... A novel hood structure has been designed for the dust control system in the foundry in order to improve the working environment. A composite strategy has been applied for comparative analysis of the optimal venting volume and the airflow distribution between the conventional hood and the novel one in this study. A Computational Fluid Dynamic (CFD) method is used to simulate the airflow fields and dust-polluted air moving paths. The CFD results show that a two-outlet hood, with one outlet located on the left of the hood, is better for improving dust-polluted air than the hood with one outlet only. It can be concluded that the number of the outlets as well as their location on the hood has a significant influence on the air flow pattern in the hood. The optimal venting volume is also a major consideration that is discussed in the study. The venting volume should be designed by considering both the effective level of air flow velocity around the dust source and the energy saving. The optimal airflow distribution may reduce the turbulence in the hood system. 展开更多
关键词 venting volume air flow distribution hood flask shaker CFD
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The Modified Envelope Orography and the Air Flow over and around Mountains 认领 引用 被引量：8
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作者 李龙 朱抱真 《Advances in Atmospheric Sciences》 SCIE CAS 1990年第3期249-260,共12页
By use of the two-layer adiabatic globe spectral model and the zonally averaged climatic data of winter season as initial values, 10-day integrations are carried out based on three kinds of model topography (i.e., (1)... By use of the two-layer adiabatic globe spectral model and the zonally averaged climatic data of winter season as initial values, 10-day integrations are carried out based on three kinds of model topography (i.e., (1) the averaged topography; (2) the envelope topography; (3) the modified envelope topography). The results show that the orography of the Northern Hemisphere plays an important role in the simulation of large-scale weather patterns in winter season. The simulation based on the envelope topography developed by Wallace et al. has some improvements in the Rocky Mountains area. But this scheme causes very serious horizontal expansion around the Tibetan Plateau (hereafter referred to as the TV). A modified envelope topography scheme has been worked out that increases the slope of the TP by decreasing the horizontal expansion while keeping the maximum altitude. The results show some improvements of the scheme around the TP. By analysis of the mechanical effects of the large-scale orography on the currents, the different forcings of the air flow over and around the TP and the Rocky Mountain (the RM) are investigated. 展开更多
关键词 AVE ENV The Modified Envelope Orography and the Air Flow over and around Mountains over
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Improvement of uniformity in cultivation environment and crop growth rate by hybrid control of air flow devices 认领 引用 被引量：1
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作者 BAEK Min-Seon KWON Sook-Youn LIM Jae-Hyun 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第12期4702-4708,共7页
A complete control type plant factory has high efficiency in terms of cultivation area by constructing vertical multiple layered cultivation beds.However,it has a problem of irregular crop growth due to temperature de... A complete control type plant factory has high efficiency in terms of cultivation area by constructing vertical multiple layered cultivation beds.However,it has a problem of irregular crop growth due to temperature deviation at upper and lower beds and increases in energy consumption by a prolonged cultivation period.In this work,air flow rate inside a facility was improved by a hybrid control of air flow devices like air conditioning and air circulation fan with an established wireless sensor network to minimize temperature deviations between upper and lower beds and to promote crop growth.The performance of proposed system was verified with an experimental environment or Case A wherein air conditioning device was operated without a control algorithm and Case B wherein air conditioning and circulation fans were alternatively operated based on the hybrid control algorithm.After planting leafy vegetables under each experimental condition,crops were cultivated for 21 days.As a result,Case B wherein AC(air conditioning) and ACF(air-circulation fan) were alternatively operated based on the hybrid control algorithm showed that fresh mass,number of leaves,and leaf length for the crops grown were increased by 40.6%,41.1%,and 11.1%,respectively,compared to Case A. 展开更多
关键词 air flow devices hybrid control cultivation environment uniformity growth rate
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Air flow patterns and noise analysis inside high speed angular contact ball bearings 认领 引用 被引量：4
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作者 翟强 闫柯 +2 位作者 张优云 朱永生 王亚泰 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3358-3366,共9页
The vortex formed around the rolling ball and the high pressure region formed around the ball-raceway contact zone are the principle factors that barricades the lubricant entering the bearing cavity, and further cause... The vortex formed around the rolling ball and the high pressure region formed around the ball-raceway contact zone are the principle factors that barricades the lubricant entering the bearing cavity, and further causes improper lubrication. The investigation of the air phase flow inside the bearing cavity is essential for the optimization of the oil-air two-phase lubrication method. With the revolutionary reference frame describing the bearing motion, a highly precise air phase flow model inside the angular contact ball bearing cavity was build up. Comprehensive factors such as bearing revolution, ball rotation, and cage structure were considered to investigate the influences on the air phase flow and heat transfer efficiency. The aerodynamic noise was also analyzed. The result shows that the ball spinning leads to the pressure rise and uneven pressure distribution. The air phase velocity, pressure and cage heat transfer efficiency increase as the revolving speed increases. The operating noise is largely due to the impact of the high speed external flow on the bearing. When the center of the oil-air outlet fixes near the inner ring, the aerodynamic noise is reduced. The position near the inner ring on the bigger axial side is the ideal position to fix the lubricating device for the angular contact ball bearing. 展开更多
关键词 high speed angular contact ball bearing air phase flow heat transfer efficiency cage structure
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Air Flow Prediction and Evaluation of Ventilation Effectiveness with Different Zonal Configurations 认领 引用
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作者 Nasreddine Guerfala Hachimi Fellouah +1 位作者 Ahmed Daoud Nicolas Galanis 《Journal of Energy and Power Engineering》 CAS 2013年第2期277-282,共6页
This paper proposes a numerical method for the study of ventilation efficiency in buildings. The developed model is validated with the experimental results of Nielsen who tested the isothermal flow in a scaled model o... This paper proposes a numerical method for the study of ventilation efficiency in buildings. The developed model is validated with the experimental results of Nielsen who tested the isothermal flow in a scaled model of a ventilated room. A zonal method is used to predict airflow patterns in the same ventilated room. The different equations governing the flow in the room were coded in Matlab for different operating conditions, different zonal configurations of the room and different number of cells （control volumes）. The efficiency of the ventilation was determined by calculating the number of ACH （air changes per hour） for each cell. The present results show the importance of the inlet air flow rate, the space resolution and the jet inlet dimensions on the determination of air quality. 展开更多
关键词 Air flow zonal method numerical simulation ventilated room ventilation efficiency.
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Robust pre-departure scheduling for a nation-wide air traffic flow management 认领 引用
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作者 Jianzhong YAN Haoran HU +4 位作者 Yanjun WANG Xiaozhen MA Minghua HU Daniel DELAHAYE Sameer ALAM 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第4期484-500,共17页
Air traffic flow management has been a major means for balancing air traffic demandand airport or airspace capacity to reduce congestion and flight delays.However,unpredictable fac-tors,such as weather and equipment m... Air traffic flow management has been a major means for balancing air traffic demandand airport or airspace capacity to reduce congestion and flight delays.However,unpredictable fac-tors,such as weather and equipment malfunctions,can cause dynamic changes in airport and sectorcapacity,resulting in significant alterations to optimized flight schedules and the calculated pre-departure slots.Therefore,taking into account capacity uncertainties is essential to create a moreresilient flight schedule.This paper addresses the flight pre-departure sequencing issue and intro-duces a capacity uncertainty model for optimizing flight schedule at the airport network level.The goal of the model is to reduce the total cost of flight delays while increasing the robustnessof the optimized schedule.A chance-constrained model is developed to address the capacity uncer-tainty of airports and sectors,and the significance of airports and sectors in the airport network isconsidered when setting the violation probability.The performance of the model is evaluated usingreal flight data by comparing them with the results of the deterministic model.The development ofthe model based on the characteristics of this special optimization mechanism can significantlyenhance its performance in addressing the pre-departure flight scheduling problem at the airportnetwork level. 展开更多
关键词 Air traffic flow management Airport and airspace network Capacity uncertainty Chance constraint Stochastic optimization
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The measurement error analysis when a pitot probe is used in supersonic air flow 认领 引用 被引量：3
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作者 ZHANG XiWen HAO PengFei YAO ZhaoHui 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第4期690-696,共7页
Pitot probes enable a simple and convenient way of measuring mean velocity in air flow. The contrastive numerical simulation between free supersonic airflow and pitot tube at different positions in supersonic air flow... Pitot probes enable a simple and convenient way of measuring mean velocity in air flow. The contrastive numerical simulation between free supersonic airflow and pitot tube at different positions in supersonic air flow was performed using Navier-Stokes equations, the ENN scheme with time-dependent boundary conditions （TDBC） and the Spalart-Allmaras turbulence model. The physical experimental results including pitot pressure and shadowgraph are also presented. Numerical results coincide with the experimental data. The flow characteristics of the pitot probe on the supersonic flow structure show that the measure- ment gives actually the total pressure behind the detached shock wave by using the pitot probe to measure the total pressure. The measurement result of the distribution of the total pressure can still represent the real free jet flow. The similar features of the intersection and reflection of shock waves can be identified. The difference between the measurement results and the actual ones is smaller than 10%. When the pitot probe is used to measure the region of L=0-4D, the measurement is smaller than the real one due to the increase of the shock wave strength. The difference becomes larger where the waves intersect. If the pitot probe is put at L=SD-10D, where the flow changes from supersonic to subsonic, the addition of the pitot probe turns the original supersonic flow region subsonic and causes bigger measurement errors. 展开更多
关键词 pitot probe supersonic air flow numerical simulation measurement error
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Numerical simulation and experimental verification on downwash air flow of six-rotor agricultural unmanned aerial vehicle in hover 认领 引用 被引量：39
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作者 Yang Fengbo Xue Xinyu +1 位作者 Zhang Ling Sun Zhu 《International Journal of Agricultural and Biological Engineering》 SCIE 2017年第4期41-53,共13页
Recently,multi-rotor unmanned aerial vehicle(UAV)becomes more and more significantly irreplaceable in the field of plant protection against diseases,pests and weeds of crops.The easy takeoff and landing performance,ho... Recently,multi-rotor unmanned aerial vehicle(UAV)becomes more and more significantly irreplaceable in the field of plant protection against diseases,pests and weeds of crops.The easy takeoff and landing performance,hover function and high spraying efficiency of UAV are urgently required to spray pesticide for crop timely and effectively,especially in dispersed plots and hilly mountains.In such situations,the current researches about UAV spray application mainly focus on studying the influence of the UAV spraying parameters on the droplet deposition,such as operation height,operation velocity and wind velocity.The deposition and distribution of pesticide droplets on crops which depends on installation position of nozzle and airflow distribution characteristics of UAV are directly related to the control effect of pesticide and crop growth in different growth periods.As a preliminary step,this study focuses on the dynamic development law and distribution characteristics of the downwash air flow for the SLK-5 six-rotor agricultural UAV.Based on compressible Reynolds-averaged Navier-Stokes(RANS)equations with an RNG k-εturbulence model and dynamic mesh technology,the efficient three-dimensional computational fluid dynamics(CFD)method was established to analyze the flow field distribution characteristics of UAV in hover.Then the unsteady interaction flow field of the wing was investigated in detail.The downwash wind speed of the marked points for the SLK-5 UAV in hover was also tested by weather tracker.It was found that the maximum velocity value of the downwash flow was close to 10 m/s;the z-direction velocity was the main body of the wind velocity in the downwash airflow,and the comparison of the wind velocity experiment test and simulation showed that the relative error was less than 12%between the experimental and simulated values of the z-direction velocity at the marked points.Then the flow characteristics of the longitudinal and cross section were analyzed in detail,the results obtained can be used as a reference for drift and sedimentation studies for multi-rotor unmanned aerial vehicle. 展开更多
关键词 UAV downwash air flow numerical simulation experimental verification pesticide spray wing interference
EFFECTS OF OROGRAPHY AND AIR FLOW IN EKMAN BOUNDARY LAYER 认领 引用
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作者 伍荣生 《Acta meteorologica Sinica》 1991年第1期62-70,共9页
It is convenient to use σ-coordinates to discuss the dynamic effect of orography and the flow in Ekman boundary layer.In this paper,the theory of mixing length is generalized to the σ-coordinate system. Then the gov... It is convenient to use σ-coordinates to discuss the dynamic effect of orography and the flow in Ekman boundary layer.In this paper,the theory of mixing length is generalized to the σ-coordinate system. Then the governing equations,describing the motion in the boundary layer over the mountain regions are derived.The features of flow in the boundary layer,especially the effects of Ekman pumping,are discussed in details.It is pointed out that there are three factors affecting the vertical motion at the top of the boun- dary layer:(1)vorticity distribution in the boundary layer,which is directly related to the divergence and convergence of air flow caused by friction,(2)the upslope or downslope motion of flow over the mountain slopes,and(3)the mutual effect of orography and friction induced by the ageostrophic component climbing up- ward or downward in the boundary layer over mountain regions. 展开更多
关键词 effects of orography air flow boundary layer Ekman pumping
Intelligent prediction on air intake flow of spark ignition engine by a chaos radial basis function neural network 认领 引用 被引量：2
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作者 LI Yue-lin LIU Bo-fu +3 位作者 WU Gang LIU Zhi-qiang DING Jing-feng ABUBAKAR Shitu 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第9期2687-2695,共9页
To ensure the control of the precision of air-fuel ratio(AFR)of port fuel injection(PFI)spark ignition(SI)engines,a chaos radial basis function(RBF)neural network is used to predict the air intake flow of the engine.T... To ensure the control of the precision of air-fuel ratio(AFR)of port fuel injection(PFI)spark ignition(SI)engines,a chaos radial basis function(RBF)neural network is used to predict the air intake flow of the engine.The data of air intake flow is proved to be multidimensionally nonlinear and chaotic.The RBF neural network is used to train the reconstructed phase space of the data.The chaos algorithm is employed to optimize the weights of output layer connection and the radial basis center of Gaussian function in hidden layer.The simulation results obtained from Matlab/Simulink illustrate that the model has higher accuracy compared to the conventional RBF model.The mean absolute error and the mean relative error of the chaos RBF model can reach 0.0017 and 0.48,respectively. 展开更多
关键词 intake air flow spark ignition engine chaos RBF neural network
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Multi-faceted spatio-temporal network for weather-aware air traffic flow prediction in multi-airport system 认领 引用 被引量：2
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作者 Kaiquan CAI Shuo TANG +2 位作者 Shengsheng QIAN Zhiqi SHEN Yang YANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第7期301-316,共16页
As one of the core modules for air traffic flow management,Air Traffic Flow Prediction(ATFP)in the Multi-Airport System(MAS)is a prerequisite for demand and capacity balance in the complex meteorological environment.D... As one of the core modules for air traffic flow management,Air Traffic Flow Prediction(ATFP)in the Multi-Airport System(MAS)is a prerequisite for demand and capacity balance in the complex meteorological environment.Due to the challenge of implicit interaction mechanism among traffic flow,airspace capacity and weather impact,the Weather-aware ATFP(Wa-ATFP)is still a nontrivial issue.In this paper,a novel Multi-faceted Spatio-Temporal Graph Convolutional Network(MSTGCN)is proposed to address the Wa-ATFP within the complex operations of MAS.Firstly,a spatio-temporal graph is constructed with three different nodes,including airport,route,and fix to describe the topology structure of MAS.Secondly,a weather-aware multi-faceted fusion module is proposed to integrate the feature of air traffic flow and the auxiliary features of capacity and weather,which can effectively address the complex impact of severe weather,e.g.,thunderstorms.Thirdly,to capture the latent connections of nodes,an adaptive graph connection constructor is designed.The experimental results with the real-world operational dataset in Guangdong-Hong Kong-Macao Greater Bay Area,China,validate that the proposed approach outperforms the state-of-the-art machine-learning and deep-learning based baseline approaches in performance. 展开更多
关键词 Air traffic control Graph neural network Multi-faceted information Air traffic flow prediction Multi-airport system
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Ammonium Salt Deposition Characteristics in an Air Cooler System Based on the Coupling of Fluid Flow and Heat Transfer Simulation 认领 引用 被引量：5
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作者 Jin Haozhe Zhou Junfeng +2 位作者 Liu Wenwen Liu Xiaofei Ou Guofu 《China Petroleum Processing & Petrochemical Technology》 CAS 2019年第4期94-102,共9页
The ammonium salt corrosion is a typical failure mode for the hydrogenation reaction effluent air cooler(REAC) system. In order to investigate the corrosion characteristics in the REAC system, numerical simulations we... The ammonium salt corrosion is a typical failure mode for the hydrogenation reaction effluent air cooler(REAC) system. In order to investigate the corrosion characteristics in the REAC system, numerical simulations were performed by using the mixture model, the heating transfer model, and the particles tracking model. The results show that the differences between the temperature and the velocity at each cross section of the first-row and second-row tubes are small. The inertia of the particles plays an important role in the particle’s deposition, and the smaller particles distribute more uniformly in the air cooler. However, for larger particles, they prefer falling from the inner side of the vertical elbow, and preferentially depositing at the inlet header and pipes before saturation. In the heat exchanger tubes, the particle deposition number is larger in the second-row tubes than that in the first-row tubes, and the high-risk tubes mainly concentrate on the middle and right side of the air cooler. The kinetic parameters of the particles are in accordance with the blocking-prone position in many real operating conditions. 展开更多
关键词 hydrogenation air cooler multiphase flow ammonium salt corrosion particles drifting
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Analysis on Link Between the Macroscopic and Microscopic Air–Water Properties in Self-Aerated Flows 认领 引用 被引量：3
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作者 WEI Wang-ru XU Wei-lin +2 位作者 DENG Jun TIAN Zhong ZHANG Fa-xing 《China Ocean Engineering》 SCIE EI CSCD 2018年第5期614-623,共10页
Self-aeration in high-speed free surface flows occurs commonly and is of interest to ocean engineering, hydraulic engineering, and environmental engineering. For two-phase air–water flows, macroscopic air–water flow... Self-aeration in high-speed free surface flows occurs commonly and is of interest to ocean engineering, hydraulic engineering, and environmental engineering. For two-phase air–water flows, macroscopic air–water flow properties develop gradually, accompanied by the change of microscopic air–water structures. In this article, representational experimental studies on macroscopic and microscopic characteristics of self-aerated open-channel flows are summarized and compared. The isolated effect of the flow Reynolds number and air quantity on the differences in air count rate and chord size are analyzed and discussed. The results show that the characterized flow depth y, affected by the turbulence transfer, is a specific criterion to distinguish the interior air–water structure development. Two distinct linear trends of self-aeration are found, depending on the y/yvariation with a breaking point at Cmean =0.50. The air count rate and size scale in self-aerated flows are affected by the air quantity of self-aerated flows, even with identical flow Reynolds numbers. Thus, a specific parameter is proposed to assess the air–water structures and a series of self-similarity relationships in self-aeration properties are obtained. The link between macroscopic and microscopic air–water properties results in significant scale effect on air–water structures in self-aerated flows. 展开更多
关键词 self-aeration two-phase flows air concentration air bubble open channel
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Simulating the air flow in the conveying pipe of the foreign fiber detection device 认领 引用 被引量：3
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作者 Ting CHEN Ke WANG Lili WU 《Frontiers of Chemical Science and Engineering》 2010年第3期275-279,共5页
Cotton bales are frequently intermingled with foreign fibers which will interfere in the process of spinning,weaving and dyeing and will worsen the product quality.Nowadays,cotton fibers are sorted manually in most of... Cotton bales are frequently intermingled with foreign fibers which will interfere in the process of spinning,weaving and dyeing and will worsen the product quality.Nowadays,cotton fibers are sorted manually in most of the cotton textile mills with very low efficiency.There is a great demand for foreign fiber detection devices in Chinese cotton textile mills.The air flow in the conveying pipe of the device has an important effect on the image acquisition,image analysis and removal of foreign fibers.As a primary effort,the air flow in the conveying pipe of the foreign fiber detection device was simulated numerically.The effects of the inlet air velocity on the air turbulence intensity and air velocity along the detecting section were studied. 展开更多
关键词 foreign fiber conveying pipe air flow numerical simulation
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