Study on influence of pyramid baffle on PEMFC performance
The flow channel structure of a proton exchange membrane fuel cell(PEMFC)has a significant impact on gas flow,diffusion and electrochemical reaction.By building the proposed three-dimensional PEMFC model of a pyramid-shaped baffle and running numerical simulations,the effects of different pyramid baffle ratios and baffle numbers on mass transfer and output performance of fuel cells were investigated.The results show that incorporating a pyramid baffle into the flow path can increase the vertical velocity component of the gas by up to 93.7%when compared to a flow path without baffle,thereby improving gas transfer performance from the flow path to the catalytic layer.When the pyramid baffle ratio is 0.25 and the number of baffles is 1,the net power of the fuel cell can reach a maximum of 0.107 W.Furthermore,increasing the baffle ratio and number of baffles can continuously improve mass transfer performance,but the flow path pressure drop can increase by up to 18.5%,which will reduce PEMFC output performance.
proton exchange membrane fuel cell(PEMFC)pyramid bafflemass transferpressure dropnet power
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万方数据
维普
