PEMFC阴极流道中阻块高度的敏度分析与优化

Sensitivity Analysis and Optimization of Blockages Height in PEMFC Cathode Flow Channel

在质子交换膜燃料电池(PEMFC)的阴极流道中安装阻块可以强化氧气传输,提升电池性能,但不同位置的阻块高度对电池性能的影响程度不同。本文建立了一个三维、两相、稳态的PEMFC数值模型,对阴极流道安装有阻块的PEMFC进行了数值模拟,并结合全因子设计法研究了不同位置的阻块高度对电池性能的影响程度。此外,基于敏度分析结果,采用遗传算法对阻块高度进行了优化。结果表明:越靠近出口位置的阻块,其高度变化对低电压下的电池功率的影响程度越大。增加靠近出口位置的阻块高度可以促进催化层反应物的均匀分布,提高催化剂的利用率,最大程度地提升电池性能。当组块高度H1和高度增量ΔH分别为0.9537 mm和0.009 mm时,PEMFC性能最佳,与未安装阻块相比,电池最大净功率提高了18.45%。

Installing blockages in the cathode flow channel of PEMFC can enhance oxygen transport and improve cell performance.However,the effects of blockage height at different channel locations on the cell performance are obviously different.In this paper,a three-dimensional,two-phase,steady-state numerical model is established to simulate the PEMFC with blockages in the cathode flow channel,and full factorial design method is used to the sensitivity analysis of the effect of blockages height on cell performance.In addition,genetic algorithm is also used to optimize the blockages height.The results show that the closer to the outlet,the greater the effect of blockages height change on cell power.Increasing the blockages height near the outlet can significantly promote the uniform distribution of oxygen in the cathode catalyst layer,improve the utilization rate of catalyst and maximize the cell performance.In this study,the maximum cell performance can be achieved when H1 and ΔH are 0.9537 mm and 0.009 mm respectively.And,compared with the case without blockages in the cathode flow channel,the net maximal power is increased by 18.45%.