PEM电池二相流流动压降建模、验证及应用研究

Modeling,Verification and Application of Two-phase Flow Pressure Drop in PEM Cells

质子交换膜燃料电池(proton electrolyte membrane fuel cell,PEMFC)流体压降对电池设计与运行管理极其重要,但因运行过程中复杂的二相流影响,压降的准确计算非常困难.文中考虑电池膜电极水传输、混合气体多组分因素、双极板流道结构因素,以及电池装夹力影响,以经验型二相流压降模型为基础,建立了PEMFC流体压降计算模型;以25 cm 2多蛇单流道流场进行了实验验证,认为模型计算值与实测值吻合良好;随后应用于5 kW及25 kW电堆的多流道大面积流场设计,进一步进行了理论计算与实验测试对比分析.

The fluid pressure drop of proton exchange membrane fuel cell(PEMFC)is extremely important for cell design and operation management.However,due to the complex two-phase flow during operation,accurate calculation of pressure drop is very difficult.In this paper,considering the influence of membrane electrode water transport,mixed gas multicomponent factors,bipolar plate flow channel structure factors and battery clamping force,a PEMFC fluid pressure drop calculation model was established based on an empirical two-phase flow pressure drop model.The flow field in a single channel with more than 25 cm 2 snakes was verified by experiments.The calculated values of the model are in good agreement with the measured values.Finally,the above method was applied to the multi-channel large-area flow field design of 5 kW and 25 kW reactors,and the theoretical calculation and experimental test were compared and analyzed.