多通道蛇形流场PEMFC内传递现象的数值模拟

电极板上的流场构型对质子交换膜燃料电池的流动特性和电池效率有重要的影响。为研究多通道蛇形流场设计质子交换膜燃料电池的局部流场、电流密度和组分浓度等的空间分布,应用作者前期发展的基于计算流体力学的三维稳态数学模型,对一个小型电池单体(电极面积大小为5.9cm×6.1cm)进行了详细的数值模拟,讨论和分析了该设计的流动特性和传输机理。结果表明:电池的电流密度分布比较均匀,阴极的压力损失要比阳极大得多,阳极氢的质量分数从流动入口到出口基本呈现增大趋势。

Numerical simulation of transport phenomena in PEMFC with multi-channel serpentine flow fields

The flow field structure in the bipolar plates has an important effect on the flow characteristics and cell efficiency. In order to investigate spatial distribution of local gas flow field, species concentration and local current density in the PEMFC (proton exchange membrane fuel cell) with multi-channel serpentine flow field, a steady three-dimensional mathematical CFD based model presented in the author's previous paper was applied to conduct numerical study on a small-scaled single proton exchange membrane fuel cell (the electrode active area 5.9 cm × 6.1 cm) in this paper. The flow characteristics and transport mechanism were discussed and analyzed. It indicates that current density is uniform, the pressure loss in the cathode is much higher than that of anode, and the mass fraction of anode hydrogen increases from inlet towards outlet.