闵春华 李飞 王坤

摘要 电池流道结构对电池性能有直接影响，有必要对电池流道结构进行研究。在质子交换膜燃料电池流道内放置堵块可以增强反应气体的传质进而增强电池性能，但不同堵块对电池性能影响不同。采用数值模拟的方法，建立了三维、稳态的单直流道质子交换膜燃料电池数值模型。对阴极流道内放置不同堵塞率堵块的质子交换膜燃料电池进行研究，重点分析堵块产生的二次流对电池性能的影响。研究发现在流道内放置堵块产生的二次流可以增强电池性能，堵块堵塞率为0.8时电池净功率最大。反应气体在流道内受到堵块扰流作用，在堵块后方产生二次流增强了反应气体传质是电池性能增强的主要原因。

关 键 词 质子交换膜燃料电池；堵块；二次流；数值模拟；堵塞率

中图分类号 TM911.4     文献标志码 A

文章编号：1007-2373（2023）03-0060-09

DOI：10.14081/j.cnki.hgdxb.2023.03.006

Effect of secondary flow in PEMFC flow field plate on cell performance

MIN Chunhua1，2， LI Fei2， WANG Kun1，2

（1. School of Energy and Environmental Engineering，Hebei University of Technology，Tianjin 300401，China；2. Hebei Key Laboratory of Thermal Science and Energy Clean Utilization， Hebei University of Technology， Tianjin 300401， China）

Abstract The channel structure of cell has a direct impact on the performance of cell， so it is necessary to study the channel structure of cell. Place blocks in the channel of proton exchange membrane fuel cell can enhance the mass transfer of reaction gas and enhance the performance of the cell， but different blocks have different effects on the performance of the cell. A three-dimensional， steady-state single channel proton exchange membrane fuel cell model was established by numerical simulation. Proton exchange membrane fuel cell with different blockage ratio blocks in the cathode channel was studied， and the effect of secondary flow generated by the block on the performance of the cell was emphatically analyzed. It is found that the secondary flow generated by block in the channel can enhance the performance of the cell， and the net power of the cell is the maximum when the blockage ratio is 0.8. The reacting gas is disturbed by the block in the channel， and the secondary flow behind the block enhances the mass transfer of the reacting gas is the main reason for the enhanced cell performance.

Key words proton exchange membrane fuel cell; block; secondary flow; numerical simulation; blockage ratio

0 引言

質子交换膜燃料电池可以直接将燃料中的化学能转换为电能，并且不受卡洛定理的制约[1]，其因启动速度快、工作温度低、功率密度高、对环境友好无污染等优点，受到了广泛的关注与研究[2]。质子交换膜燃料电池的主要部件包含质子交换膜、催化层、气体扩散层和双极板。双极板是质子交换膜燃料电池的重要组成部分，不仅为电池提供支撑，并且承担着排水、收集电流、向电池提供反应物等功能[3]，其流场结构直接决定了电池性能的好坏。因此，研究流场结构对提升电池性能是十分必要的。

近年来，许多研究者通过在电池流场内增加堵塞物来提升电池性能。……