Abstract: The two dimensional， two-phase mathematical model was developed for the cathode of proton exchange membrane fuel cell with conventional flow field operated with air. The governing equations included conductive equation, continuity equation in porous media, the convection-diffusion equations for O₂ and water vapor, and the transfer equation for liquid water.The concentration of O₂ and water vapor, the current density and liquid water saturation in the diffuser were calculated.The mechanism of H₂O transport in the cathode diffuser and the gaseous species concentration distribution in the diffuser were studied.

Key words: 质子交换膜燃料电池, 两相流, 数值模拟, 条形流场

摘要： 对采用常规条形流场的H₂-Air PEMFC阴极建立了二维两相流模型，控制方程耦合了电传导方程、O₂和气态H₂O的对流-扩散方程、多孔介质连续性方程以及液态H₂O输运方程.利用模型计算了阴极扩散层中O₂浓度、气态H₂O浓度、电流密度以及液态水饱和度的分布，分析了扩散层中H₂O的传递方式及各组分浓度分布的特点.

关键词: 质子交换膜燃料电池, 两相流, 数值模拟, 条形流场