PEMFC流场板流体压降研究

Study on pressure drop of gas flow in flow field plate of PEMFC

流体压降是质子交换膜燃料电池(proton electrolyte membrane fuel cell,PEMFC)流场板设计的一个重要指标。以25 cm2单蛇形流场板为研究对象,选取单相流及不同的二相流模型,同时考虑膜电极(membrane electrode assembly,MEA)在组装后压缩变形凸进流道中对流通有效截面积的影响,模拟计算流体压降,并与流阻实测值进行比较。结果表明:在低于1 500 m A/cm2的常用工况下,基于English-Kandlikar二相流模型,同时考虑MEA组装变形影响的流体压降计算值与实测值最为接近。该结论对流场设计具有参考意义。

Pressure drop is an important parameter for designing the flow field plate of proton exchange membrane fuel cell. A 25 cm2 single serpentine flow field plate was chosen, the flow pressure drop was calculated with different single-phase flow and two-phase flow models, and compared with the measured values. The effect of the deformation of membrane electrode assembly on the pressure drop of the gas flow caused by compression was also considered. The results show that when current density is lower than 1 500 mA/cm2, the fluid pressure drop calculated with English-Kandlikar model and considering the compression deformation of MEA is the closest to the measured value. The conclusion is helpful for the flow field design.