PEM燃料电池阴极三维数学模型

The three-dimensional model of cathode in a PEM fuel cell

通过耦合求解质量守恒方程、动量守恒方程和组份守恒方程,计算出点状、多蛇形和单蛇形三种不同流场阴极O2和H2O浓度的分布以及气体速度分布。电流密度为600mA/cm2时,催化层与扩散层交界面处点状、多蛇形和单蛇形流场中的最小O2浓度是逐步增加,约为1.5%;最大H2O浓度依次减小,大约1.5%;扩散层中间处气体速度依次增加。最后通过单电池实验得到三种流场的电池性能和模型中气体分布情况一致。

By coupling the continuity equation, momentum equation and mass transport equation, we can compute O2 and H2O concentration distribution and the gas velocity distribution at the cathode with pin flow field, multi meander flow field and single meander flow field. When current density was 600mA/cm^2, The rain O2 concentration increased by about 1.5% and max H2O concentration decreased by about 1.5% at the catalyst-GDL interface and the gas velocity at the middle of GDL was improved. At last, single cell test result showed that the performance of this three flow fields accorded with the gas distribution in the model.