质子交换膜燃料电池阳极内流动与传质特性模拟

Simulation of flow and mass transfer characteristics in anode of PEMFC

针对直流道质子交换膜燃料电池阳极,建立二维稳态的数学模型研究流道和电极内的流动和传质特性。模型采用通用D arcy定律来描述多孔介质与非多孔介质区域的流体流动,可以模拟沿流动方向上的物质变化情况,并探讨进口速度、进口氢气质量分数和催化层厚度对质量传输的影响。结果表明:增大进口速度、增加进口氢气质量分数、降低催化层厚度有利于氢气的质量传递。

A two-dimension, steady-state, multi-component transport model is presented to investigate the anodic flow and mass transfer processes of a proton exchange membrane fuel cell. Darcy law is used to describe the gas flow of the calculational domain. The model can predict the change of mass component in the direction of flow and explore the effect of inlet velocity, inlet hydrogen content and catalyst layer thickness on the mass transfer of hydrogen. The results show that： increase inlet velocity, inlet hydrogen content and decrease catalyst layer thickness make the mass transfer of hydrogen easily.