The flow field structure has an important influence on the comprehensive performance of the proton exchange membrane fuel cell (PEMFC). This research investigates the effects of combined flow fields on the distribution of species concentration, the pressure drop, and the overall performance of PEMFC based on the polarization curve and power consumption ratio (PCR). Obstacles are arranged in different areas to study the mass transfer of the gas inside the combined flow field. The results show that the combined serpentine flow field improves the concentration distribution of species and the performance of the cell is enhanced with the increase of the proportion of the single-channel serpentine structure in the combined flow field, but the PCR is decreased. The energy efficiency conversion in the low voltage region is better when the obstacles are arranged in the entire flow field. Moreover, the vortex effect generated by the obstacles enhances the convection ability under the rib parallel to the inlet direction, while the transverse vortex and secondary flow perpendicular to the inlet direction are weakened by the flow field structure so that the mass transfer of gas is enhanced.

中文翻译：

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组合流场和障碍物对质子交换膜燃料电池性能影响的数值研究

流场结构对质子交换膜燃料电池（PEMFC）的综合性能具有重要影响。本研究基于极化曲线和功耗比（PCR）研究了组合流场对物质浓度分布、压降以及质子交换膜燃料电池整体性能的影响。在不同区域布置障碍物，研究组合流场内气体的传质情况。结果表明，随着组合流场中单通道蛇形结构比例的增加，组合蛇形流场改善了物种浓度分布，反应池性能增强，但PCR性能下降。当障碍物布置在整个流场中时，低压区域的能量效率转换更好。此外，障碍物产生的涡流效应增强了肋下平行于入口方向的对流能力，而流场结构则削弱了垂直于入口方向的横向涡流和二次流，从而增强了气体的传质。