（School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430205, China）
Abstract: In order to investigate the effect of different flow field structures on the performance of proton exchange membrane fuel cell(PEMFC), a novel bionic flow field based on the improved capillary structure of human lungs was designed. In this paper, computational fluid dynamics software Fluent was used to carry out numerical simulation for the PEMFC in bionic flow field, parallel flow field, and single snake flow field respectively. The polarization curves, the pressure drop, the distribution of gas concentration and the distribution of the current density of three PEMFCs were compared, and the effects of relative humidity of cathode and anode on the performance of novel bionic flow field PEMFC were explored. The results showed that the distribution of hydrogen, oxygen and water in the bionic flow field is most uniform,the pressure drop value of the cathode channel is smallest, and the current density on the cathode catalytic layer is largest. At high voltage,with the increasing of cathode and anode humidity, the current density increases, resulting in improved cell performance, and the effect of anode gas humidity on cell performance is greater than that of cathode gas humidity. At low voltage, with the increasing of cathode and anode humidity, the current density decreases, resulting in decreased cell performance, and the effect of cathode gas humidity on cell performance is greater than that of anode gas humidity.
Key words: proton exchange membrane fuel cell; numerical simulation; relative humidity of cathode and anode; flow field structure
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