蛇形流场PEMFC性能影响因素的数值模拟

为了研究蛇形流场质子交换膜燃料电池(PEMFC)的输出性能,分析其性能的影响因素,寻找改善其性能的方法和途径。基于多物理场直接耦合分析软件COMSOL Multiphysics,建立了包括阴阳极流道、扩散层、催化层及质子交换膜在内的完整的PEM燃料电池三维全流场稳态模型,在COMSOL中利用该模型对蛇形流场PEMFC进行了数值模拟和分析。模拟结果得出了在工作电压为0.7 V的条件下,蛇形流场的流型以及质子交换膜的电导率对PEMFC输出性能的影响。分析表明三蛇形流场的性能优于单蛇形流场;随着质子交换膜电导率的增大,膜内传质得以改善,可以降低传质过程中的电阻损耗,提高燃料电池的性能。模拟结果对于改善PEMFC整体性能有着重要的指导意义。

Numerical simulation of influencing factors on performance of PEMFC with serpentine flow field

In order to study the output performance of the PEMFC with serpentine flow field,the influence factors of its performance were analyzed,and then ways and means were looked for to improve its performance.Based on the multi-physics field direct coupling analysis software COMSOL Multiphysics,a complete 3D whole flow field steady model of PEMFC was established,which included anode and cathode flow field,gas diffusion layer,catalyst layer and proton exchange membrane.By using the model,PEMFCs with serpentine flow field were simulated and analyzed in COMSOL.The simulation results show that when the working voltage is 0.7 V,the influence of flow pattern and membrane conductivity on the output performance of the PEMFCs.The analysis indicate that the performance of three-channel serpentine flow field is superior to the single serpentine flow field.With the increasing of membrane conductivity,the mass transfer in membrane could be improved,then the resistance loss was reduced in the process of mass transfer,and the performance of the fuel cells was improved.It had an important guiding significance for improving the overall performance of PEMFCs.