基于拓扑优化的PEMFC波形流场性能研究OA

s:Aiming at the problems of uneven mass transfer and water flooding in the traditional flow field of proton exchange membrane fuel cell(PEMFC),a waveform flow field design method based on topology optimization was proposed for the first time.A two-dimensional porous medium model was established to generate the waveform flow channel,and the performance was verified by a three-dimensional multiphase model after smooth reconstruction of Bessel curves.The results show that the topology-optimized waveform flow field(Case 3)improves the average current density by 3.4%,the maximum power density by 3.6%,and the uniformity of the current density distribution by 12.7%at a voltage of 0.6 V.The waveform structure enhances the transverse mass transfer,the oxygen concen-tration in the catalytic layer is increased by 2.4%(Case 1),and the liquid water concentration in the flow channel is reduced by 11.2%(Case 3).In addition,although topological cell optimization reduces the local diffusion power consumption,multiple bends in series lead to a dramatic increase in the ac-tual pressure drop,revealing a contradiction between cell optimization and flow evolution.This study provides new ideas for the application of topology optimization in flow field design.