PEMFC微流道内液滴运动的数值分析

Numerical analysis of droplet moved in micro-channel of proton exchange membrane fuel cell

将质子交换膜燃料电池(PEMFC)中产物水通过扩散层(GDL)排入流道的过程简化为二维模型,并采用流体体积模型(VOF)的方法进行仿真研究。从流道内液滴形态、压力分布、液相体积分数以及排出微流道所需时间来分析重力、微孔数量以及微孔间距对流道排水性能的影响。研究结果表明燃料电池的气体扩散层相关参数对排水性能有一定的影响。因此,在质子交换膜燃料电池扩散层的设计中应考虑其表面微孔数量及微孔间距,以保证电池良好的排水性能。

The process of water generated in PEMFC were removed into the micro-channel through the gas diffusion layer(GDL)was simplified to a two dimensional model in this thesis.The fluid volume model(VOF)method was used to simulate the process in this paper.The influence of the gravity,the quantity of micropores and the spacing of micropores on the performance of removing water were analyzed by simulating the droplet morphology,pressure distribution,liquid volume fraction and time required to remove the microchannels.The results show that the parameters of the gas diffusion layer in proten exchange membrane fuel cell have a certain influence on the performance of removing water.Therefore,the quantity and the spacing of micropores in the design of GDL in PEMFC should be taken into consideration to ensure the optimal performance of removing water in the proten exchange fuel cell.