PEMFC扩散层中气体组分反应和传递格子Boltzmann模拟  

Lattice Boltzmann Simulation of Gas Component Reaction and Transfer in PEMFC Diffusion Layer

作　　者：邬芊申 魏光华[1] 王思茗 张朝阳[1] WU Qianshen;WEI Guanghua;WANG Siming;ZHANG Chaoyang(SJTU-Paris Tech Elite Institute of Technology,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学巴黎卓越工程师学院,上海200240

出　　处：《新能源进展》2024年第3期276-284,共9页Advances in New and Renewable Energy

基　　金：国家自然科学基金青年项目(52306262);上海交通大学深蓝计划项目(SL2022MS005)。

摘　　要：通过格子Boltzmann方法中的多组分Shan-Chen模型对燃料电池气体扩散层与双极板流道特征结构进行模型构建,探究不同孔隙率、压缩比以及积水液滴位置对质子交换膜燃料电池(PEMFC)内气体组分传递的影响。模拟结果发现小孔隙率会造成气体的堵塞,影响传质效率,而气体扩散层的压缩效应导致结构变形进而造成气体在流道进口处的堵塞;压缩导致气体通道变得狭窄,促进氧气接触下部的催化层发生反应,流道附近的反应强度会随着压缩比的增加而增加;当积水液滴位于扩散层中部时,其能够将部分的反应气体引导到催化层处,从而增加反应气体的浓度;而位于底部的液滴会将催化剂覆盖从而阻碍催化反应的进行。The multi-component Shan-Chen model in the lattice Boltzmann method is used to model the characteristic structures of the gas diffusion layer and the bipolar plate flow channel of the fuel cell,and the effects of different porosities,compression ratios,and the location of the waterlogged droplets on the transfer of the gas components in the proton exchange membrane fuel cell(PEMFC)are investigated.The simulation results show that the small porosity will cause the blockage of gas,which affects the mass transfer efficiency,and the compression effect of the gas diffusion layer leads to the deformation of the structure and then causes the blockage of gas at the inlet of the flow channel;the compression leads to the narrowing of the gas channel,which promotes the oxygen to contact the catalytic layer in the lower part of the catalytic layer for the reaction,and the intensity of the reaction in the vicinity of the flow channel increases with the compression ratio;when the water droplets are located in the middle of the diffusion layer,they can direct part of the reacting gas to the catalytic layer,thus increasing the concentration of the reacting gas;while the droplets located at the bottom will cover the catalyst and thus hinder the catalytic reaction.

关 键 词：质子交换膜燃料电池 气体扩散层 格子BOLTZMANN方法 压缩效应 积水液滴 

分 类 号：TK91[动力工程及工程热物理] TM911.4[电气工程—电力电子与电力传动]