流道脊宽对梯形流道质子交换膜燃料电池性能的影响

Performance influence on proton exchange membrane fuel cell with trapezoidal flow channel by ridge width

为研究流道脊宽对梯形截面流道质子交换膜燃料电池(proton exchange membrane fuel cell,PEMFC)性能的影响,通过流体动力学软件Fluent搭建PEMFC三维模型,分析单通道燃料电池宽度为2 mm,流道脊宽分别为0.6、0.8、1.4、1.6 mm时质子交换膜温度、阴极气体扩散层和催化层接触面的水饱和度及氧气的质量分数、输出平均电流密度等参数变化对PEMFC性能的影响。结果表明:增大流道脊宽可以提高电池内部的温度均匀性及水管理性能,会减少气体扩散层和催化层接触面的氧气的质量分数,进而降低输出平均电流密度,在应用中需提高进气量以改善电池内部的氧气供给。该研究可为PEMFC的结构设计提供指导。

To study performance influence on ridge width to proton exchange membrane fuel cell(PEMFC)with trapezoidal flow channel,the PEMFC three-dimensional model is built by the fluid dynamics software Fluent,which is is used to analyze the influence of parameter variation on PEMFC performance when the width of the single-channel fuel cell is 2 mm and ridge width of flow channel is 0.6,0.8,1.4 and 1.6 mm respectively.Parameters investigated include the temperature of proton exchange membrane,water saturation and oxygen mass fraction at the interface between cathode gas diffusion layer and catalytic layer,and average current density,etc.The results show that the larger ridge width of flow channel is,the higher temperature uniformity and the performance of water management inside the battery is.The less oxygen mass fraction at the interface between gas diffusion layer and catalytic layer is,the lower average current density is.To improve oxygen supply inside the battery,it is necessary to increase the flow of intake air in the application.This study can provide guidance for the structural design of PEMFC.