Study on the distribution characteristics of different flow field structures of proton exchange membrane fuel cells
The flow field structure is an important factor affecting the performance and characteristic parameter distribution of proton exchange membrane fuel cell(PEMFC).Understanding the distribu-tion of various characteristics within PEMFC is a prerequisite for improving battery performance,stability and durability.Therefore,it is necessary to fully understand the distribution of performance parameters in fuel cells.In this paper,the differences in the performance of parallel,single and triple snake flow fields are studied by numerical simulation and simulation.The effects of the three flow fields on the distribution characteristics of fuel cells are compared.A novel criterion,impedance dis-tribution,is used to evaluate the influence of the flow field structure on the performance uniformity.The results show that the polarization curve performance of fuel cell with serpentine flow field is bet-ter than that of parallel flow field.Then,by analyzing the current density,impedance and tempera-ture distribution,we get the conclusion that the parallel flow field has better uniformity,and the three serpentine flow field takes into account the advantages of single serpentine and parallel flow field.By introducing the uniformity parameter(standard deviation)to describe the uniformity of characteristic parameter distribution,the impedance distribution uniformity parameters of parallel,single and multi-snake flow fields are 0.235,0.305 and 0.245 Ω·cm2,respectively.
proton exchange membrane fuel cellflow field structurenumerical simulationhomoge-neity research