【摘要】 为研究质子交换膜燃料电池内水对电池输出性能的影响,搭建了一维燃料电池气液两相流模型,该模型考虑了氧气、氢气、水蒸气和液态水在气体流道、气体扩散层和催化层中的流动以及膜结合水在聚合物中的传输过程,同时考虑了电池内部水的相变。采用该模型分析了进气相对湿度对燃料电池输出性能的影响,结果表明:在小电流密度工况下,高相对湿度入口气体能够降低电池内阻提高输出电压;在进气相对湿度较高和大电流密度条件下,阳极比阴极更容易发生水淹。更多还原

【Abstract】 For investigating the effect of water on the performance of polymer electrolyte membrane fuel cell(PEMFC),a transient isothermal one-dimensional model for analyzing the two-phase transport is developed in this work. The transports of oxygen,hydrogen,water vapor and liquid water in gas diffusion layer,catalyst layer and gas channels are considered. Phase change of water is also considered in this work. The influence of relative humidity of inlet gas on the cell performance is investigated and the results show that at low current density condition,high relative humidity gas can reduce the resistance to improve the output voltage and the flooding tends to happen in anode at high relative humidity gas and high current density condition.更多还原