多直流道PEMFC系统仿真模拟研究  

Simulation Research on Multi-DC PEMFC System

作　　者：张少峰 ZHANG Shaofeng(College of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《当代化工》2025年第1期154-158,共5页Contemporary Chemical Industry

基　　金：国家自然科学基金项目(项目编号:51566010)。

摘　　要：利用有限元分析软件COMSOL Multiphysics研究了在不同的电压条件下,多直流道质子交换膜燃料电池(Proton Exchange Membrane Fuel Cell,PEMFC)温度的变化、水摩尔分数的变化以及膜中电流密度的变化,同时探究了扩散层孔隙率对燃料电池内部温度和水摩尔分数分布的影响。结果表明:工作电压与电池的输出电流密度成反比,工作电压越大,电池的电流密度越小,电池内部的温度越低,温差越小,质子交换膜越湿润,电池的输出性能越好,工作稳定性更强;对于多直流道的流场而言,电池中水摩尔分数对于电压的变化不敏感,但电压的变化会引起电池内水的再分布,电压越低,电池中水的分布越不均匀;扩散层孔隙率对电池温度的影响不大,不是电池温度分布均匀性的决定性因素,但是该因素在电池结构设计中不可忽视,综合考虑,扩散层孔隙率应保持在0.5左右最优。The change of temperature in the membrane,the change of water content in the cell and the change of current density in the membrane under different voltage conditions were studied by using the finite element analysis software COMSOL Multiphysics.At the same time,the influence of porosity in the diffusion layer on the distribution of temperature and water content in the fuel cell was also explored.The results showed that the working voltage was inversely proportional to the output current density of the battery,the higher the working voltage,the smaller the current density of the battery,the lower the internal temperature of the battery,the smaller the temperature difference,the wetter the proton exchange membrane,the better the output performance of the battery and the stronger the quality of working stability;for multi-channel flow field,the water content in the battery was insensitive to the change of voltage,but the change of voltage could cause the redistribution of water in the battery,and the lower the voltage,the more uneven the distribution of water in the battery;the porosity of the diffusion layer had little influence on the temperature of the battery,and was not the decisive factor for the uniform temperature distribution of the battery,but this factor could not be ignored in the design of the battery structure.Considering comprehensively,the porosity of the diffusion layer should be kept at about 0.5.

关 键 词：质子交换膜燃料电池 工作电压 扩散层孔隙率 数值模拟 

分 类 号：TM911[电气工程—电力电子与电力传动]