中文摘要：

对树状分形流场的质子交换膜燃料电池（PEMFC）进行了三维数值模拟。建立了三维稳态两相等温模型来研究树状分形流场燃料电池内的流体流动、多组分的传递过程和电化学反应过程。分别从PEMFC在大电流密度时和小电流密度时的氧气浓度、水蒸气浓度、液态水浓度和膜中的水含量、电流密度来进行了讨论。结果表明：在大电流密度下物质的传输速度变大,阴极生成更多的液态水,流场和扩散层中的氧气浓度要比低电流密度时要小。膜中的水含量在流道入口处最小,故此处膜对质子的传递性能最差。

英文摘要：

Three dimensional numerical analysis of proton exchange membrane fuel cell with fractal tree-like field was made. A three-dimensional, steady-state, gas-liquid two phase, isothermal model was developed to investigate the fluid flow, multi-component transport and electrochemical reaction. Oxygen concentration, water vapor concentration,liquid water concentration, water content in PEM, current density were described emphatically. The results show that reactants transport velocity is bigger and there＇s more liquid water at cathode when the fuel cell works at high current density. At the entrance of channel the water content of PEM was to a minimum.