Abstract In this work, a three-dimensional multi-component transport CFD model is established to discuss the discrepancies of local distributions under channels and ribs based on the serpentine flow field. Globally, increment of activation loss in the gas diffusive layer takes more effects on catalytic activity than decrease of oxygen concentration. Locally, current density under the channels and ribs is more affected by activation loss and oxygen concentration, respectively. Then the performance of four serpentine flow fields with different bend layouts and flow directions were compared according to the mean value and variance of current density and membrane water content on the cathode membrane surface. The results show that the current density on the membrane surface of the serpentine flow field with non-overlapping bends is more uniform and the standard deviation is about 6.25% lower than that of the overlapping bend. Co-flow has some advantages in uniformity of water content distribution on the cathode membrane surface, and the standard deviation is about 12.6% lower than that of the counter-flow. For large-scale and multi-channels serpentine flow field, the serpentine flow field with non-overlapping bends and co-flow has better application than other three types.

中文翻译：

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不同弯曲布局和流向质子交换膜燃料电池全局和局部性能变化的数值分析

摘要 本文建立了三维多分量输运CFD模型，基于蛇形流场讨论了通道和肋下局部分布的差异。总体而言，气体扩散层中活化损失的增加对催化活性的影响大于氧浓度的降低。在局部，通道和肋下的电流密度分别更受活化损失和氧浓度的影响。然后根据阴极膜表面电流密度和膜含水量的均值和方差，比较了四种不同弯曲布置和流向的蛇形流场的性能。结果表明，具有非重叠弯曲的蛇形流场膜表面的电流密度更均匀，标准偏差比重叠弯曲低约6.25%。顺流在阴极膜表面水分分布的均匀性方面具有一定的优势，标准偏差比逆流低约12.6%。对于大规模、多通道的蛇形流场，非重叠弯道和合流蛇形流场比其他三种类型具有更好的适用性。