波形流道对高温PEMFC性能的影响

Effect of waveforms on the performance of high temperature PEMFC

采用COMSOL Multiphysics软件建立高温质子交换膜燃料电池(PEMFC)三维稳态模型,并进行模拟计算,分析波形流道结构参数对阴极氧气、水的浓度分布及电流密度分布的影响。波形流道结构引起的俯冲效应,流场内物质在各方向上的流速分量增大,促进氧气向气体扩散层(GDL)扩散,有利于阴极中累积水分的排出。流道中波形数量的增加,使俯冲效应效果更显著,能获得更高的电流密度。当电势为0.4 V时,电流密度从无波形直流道时的9527.5 A/m^2提升到波形数量为10时的9758.9 A/m^2,提高了燃料电池的性能。

COMSOL multiphysics software was used to establish a three-dimensional steady-state model of high temperature proton exchange membrane fuel cell(PEMFC),the simulation calculation was carried out.The influences of structural parameters of the wave channel on concentration distribution,current density distribution of cathode oxygen and water were analyzed.The subduction effect caused by the wavy channel structure increased the velocity component of the material in all directions,the diffusion of oxygen to the gas diffusion layer(GDL)was promoted,the discharge of accumulated water in the cathode was facilitated.When the potential was 0.4 V,the current density increased from 9527.5 A/m 2 when there was no waveform straight channel to 9758.9 A/m 2 when the waveform number was 10,the performance of fuel cell was improved.