科研之友
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摘要
In order to effectively improve the performance of proton exchange membrane fuel cell（PEMFC），a new flow field（FF）design with pentagonal baffle at the cathode is proposed. In order to fully understand the influence of the addition of pentagonal baffles on the mass transfer process within the fuel cell（FC），a three-dimensional，multiphase and non-isothermal steady-state model is developed，embedding the anisotropic transport properties caused by the porous layer structures and the heterogeneous model of the actual agglomerate structure of the catalyst layer in the model，studying the changes in FC performance when the height of the baffles changes. The results show that the pentagon baffle enhances the mass transfer performance and gas distribution uniformity. With the increase of the baffle height，the mass transfer performance，drainage performance and gas distribution uniformity of the flow channel increase. The baffle with a height of 100%（H100）blocks the drainage channel due to its direct contact with the gas diffusion layer，so its water retention performance is the best. Under the condition of relative humidity of 50%，the FF structure with H100 baffle has the maximum net power density，which is 17.778% higher than the original FF（H0）. ? 2023 SAE-China.
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