PEM燃料电池内部水传递的数值模拟

MODELLING OF WATER TRANSPORT IN PEM FUEL CELL

水的传递和分布对PEM燃料电池的性能具有重要影响,本文建立了一套分区域求解、两相流、非等温数学模型对此进行了研究,首次清晰地展示出二维空间的水传递和分布特性,得到如下有价值的详细信息:沿流动方向阳极侧的总水分浓度不断降低,而阴极侧的却不断升高,阴极流道末端易发生水淹;阴极GDL中的液态水分布随电流大小而不同:小电流时从内到外逐渐减少,而大电流时则逐渐增多。

A mixed-domain, two-phase flow, non-isothermal model is developed to study the water transport phenomena, which has significant effects on the performance of PEM fuel cells. Modelling results show that： the total water concentration is decreasing along the channel in anode, while it is increasing in cathode, flooding is most likely to occur at the end of cathode flow channel; liquid water in cathode GDL presents opposite distribution at high current density and low current density, the saturation of liquid water is decreasing from inner side to outer side across the GDL at low current density while it is increasing at high current density.