波形流道增强质子交换膜燃料电池性能

Wavy channels to enhance the performance of proton exchange membrane fuel cells

质子交换膜燃料电池(PEMFC)的性能和耐久性受到燃料的输送和水管理等的限制,流道对PEMFC的质量传输起着至关重要的作用。该文设计了一个三维波形流道,建立了与实验条件一致的单根直流道模型,对比研究了直流道和波形流道对PEMFC性能提升的机理,分析了两种流道内氧气、液态水、速度以及电流密度分布。研究结果表明:在较高电流密度下,三维波形流道强化了狭窄通道部分氧气向催化层的传输,提高了氧气的供应,有效地去除了流道内的液态水,使峰值功率密度提高了10.16%。

The performance and durability of proton exchange membrane fuel cells(PEMFCs) are limited by factors related to fuel delivery and water management with the flow channel significantly affecting these factors. This study investigated flow in a three-dimensional wavy channel using a single straight channel model consistent with the experimental conditions. The model was used to analyze the performance of PEMFCs with straight channels and wavy channels and the oxygen, liquid water, velocity and current density distributions in the two channels. The results show that for high current densities, the three-dimensional wavy channel enhances the oxygen transfer from the narrow channel to the catalytic layer, improves the oxygen supply, effectively removes the liquid water in the channel, and increases the peak power density by 10.16%.