In order to clarify the gas-liquid flow law in the plate of hydrogen fuel cell,improve the output performance of hydrogen fuel cell,optimize the output characteristics of the battery from the flow field structure,the design scheme of radial flow snake flow field is proposed,and the influence of the flow field branch and area on the gas-liquid transfer and the output characteristics of the battery is simulated.The simulation results show that in the flow field with different number of branches,the flow field structure of the 3 branches has smaller water clogging area,which is more conducive to oxygen transportation,and the output performance is better.Compared with the 5 branches,the current output range can be widened by 14.1%.However,when the current density is large,the gas transmission inside the flow field is not timely,and the power output is greatly affected by the concentration polarization voltage.The flow fields area mainly affects the Ohm control region and the concentration control region.The output performance of the large area flow field is better in the Ohm control region,and the output performance of the small area flow field is better in the concentration control region.
关键词
氢燃料电池/流场设计/气液流动/极化特性
Key words
hydrogen fuel cell/flow field design/gas-liquid flow/polarization characteristics
维普
万方数据