In order to solve the problems of non-uniform gas concentration distribution and serious flooding in the parallel flow field of traditional PEMFC, a stepped flow field of PEMFC bipolar plate is proposed in this paper. The gas concentration distribution, velocity distribution, liquid water distribution and current density distribution of traditional parallel flow field and stepped flow fields are studied by computational fluid dynamics (CFD) simulations. The results suggest that the fuel cells with stepped flow field are superior than the traditional fuel cell with parallel flow field. Compared with fuel cell with parallel flow field, the net power of fuel cell with stepped flow field is increased by 21.5%. Moreover, the stepped flow fields can improve the uniformity of gas concentration and current density distribution, accelerate the discharge of liquid water, alleviate water flooding phenomenon.

中文翻译：

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PEMFC双极板阶梯式流场设计的性能研究

针对传统质子交换膜燃料电池平行流场中气体浓度分布不均匀、水泛严重的问题，提出一种质子交换膜燃料电池双极板阶梯式流场。通过计算流体动力学（CFD）模拟研究传统平行流场和阶梯流场的气体浓度分布、速度分布、液态水分布和电流密度分布。结果表明，阶梯流场燃料电池优于传统平行流场燃料电池。与平行流场燃料电池相比，阶梯流场燃料电池的净功率提高了21.5%。此外，阶梯式流场可以改善气体浓度和电流密度分布的均匀性，加速液态水的排出，缓解水淹现象。