质子交换膜燃料电池的三维数学模型

Three-dimensional mathematical model for PEMFC

采用聚集体模型描述催化层结构,建立了包括蛇形流道、扩散层、催化层和电解质膜的质子交换膜燃料电池(PEM-FC)三维流体力学模型。模型方程借助Fluent 6.0求解。模拟极化行为与实验结果一致,证实了模型的有效性。给出了流场和工作电流密度等参数的空间分布。计算表明:在一定范围内增加催化层孔隙率和电解质含量,会降低燃料电池的性能。模型适合于考察催化层参数对PEMFC的影响。

A three-dimensional fluid dynamic model for a PEMFC was developed by taking into account the catalyst layer with agglomerate structure, which consisted of gas snake channels, gas diffusion layers, catalyst layers and the electrolyte membrane. Governing equations were solved by Fluent 6.0. The model was validated by the good agreement between predicted results and the experimental data. Spatial distributions of flow fields and current densities were presented. Simulation results revealed that the electrochemical performance degraded with increasing the porosity and the electrolyte content of the catalyst layer, which demonstrated the applicability of the present model to investigate the influence of the catalyst layer parameters on the performance of a PEMFC.