In proton exchange membrane fuel cell (PEMFC), the cathode flow field structure affects the performance of PEMFC. In a previous study, we proposed a new tapered slope flow field (TSFF). In this study, Ansys Fluent software was used to simulate a PEMFC with a tapered slope cathode flow field structure. The results show that the performance of the TSFF is superior, the drainage efficiency is higher, and the oxygen mass fraction distribution is more uniform. Furthermore, comparing double-sided TSFF with different lengths, the PEMFC performance first increases and then decreases as the length of the tapered slope increases. In particular, the oxygen mass fraction and current density distributions are more uniform in the double-sided TSFF with L = 1.2 mm and the PEMFC performance is the best, and compared with the serpentine flow field, the maximum power density of PEMFC is increased by 5.89%. A detailed analysis of the geometric structure of the flow field can help us understand the reasons why the TSFF structure improves the performance of PEMFC and comprehensively evaluate the flow field performance. The TSFF enhances the flow rate of reactant diffusion to the CL and enhances the mass transfer downstream of the flow field. In particular, when L = 1.2 mm, the relative magnitude of the reactant flow resistance loss in the double-sided TSFF was 1.86% smaller than that of the serpentine flow field.

在质子交换膜燃料电池 (PEMFC) 中，阴极流场结构影响 PEMFC 的性能。在之前的研究中，我们提出了一种新的锥形斜坡流场 (TSFF)。在本研究中，Ansys Fluent 软件用于模拟具有锥形斜率阴极流场结构的 PEMFC。结果表明，TSFF性能优越，排水效率更高，氧质量分数分布更均匀。此外，比较不同长度的双面 TSFF，PEMFC 性能随着锥形斜面长度的增加先增加后降低。特别是，L = 1.2 mm 的双面 TSFF 中氧质量分数和电流密度分布更均匀，PEMFC 性能最好，与蛇形流场相比，PEMFC的最大功率密度提高了5.89%。详细分析流场的几何结构可以帮助我们理解TSFF结构提高PEMFC性能的原因，并综合评估流场性能。TSFF 提高了反应物扩散到 CL 的流速，并增强了流场下游的传质。特别是当 L = 1.2 mm 时，双面 TSFF 中反应物流阻损失的相对大小比蛇形流场小 1.86%。TSFF 提高了反应物扩散到 CL 的流速，并增强了流场下游的传质。特别是当 L = 1.2 mm 时，双面 TSFF 中反应物流阻损失的相对大小比蛇形流场小 1.86%。TSFF 提高了反应物扩散到 CL 的流速，并增强了流场下游的传质。特别是当 L = 1.2 mm 时，双面 TSFF 中反应物流阻损失的相对大小比蛇形流场小 1.86%。