基于数值模拟研究渗透率对HT-PEMFC性能的影响  

Effects of the Permeation Rate on HT-PEMFC Performance Based on the Numerical Simulation

作　　者：陈士忠[1] 刘健[1] 夏忠贤[1] 张旭阳[2] 吴玉厚[1] 

机构地区：[1]沈阳建筑大学机械工程学院,辽宁沈阳110168 [2]迈阿密大学工程学院,佛罗里达州迈阿密33101

出　　处：《沈阳建筑大学学报（自然科学版）》2015年第4期706-713,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51176131);辽宁省博士启动基金项目(20121050);辽宁省教育厅基金项目(LJQ201205);沈阳市科技计划项目(F12-277-1-30)

摘　　要：目的研究气体扩散层多孔介质渗透率对高温质子交换膜燃料电池(HTPEMFC)性能的影响,优化PEMFC的结构参数,提高电池的整体性能.方法采用多物理场直接耦合分析软件COMSOL Multiphysics,以直通道流场结构的PEMFC在工作电压为0.4V的条件下,对气体扩散层渗透率分别设定为1.18×10-12m2、1.18×10-11m2、1.18×10-10m2以及1.18×10-9m2的HT-PEMFC进行数值模拟和结果分析.结果模拟结果得出了流道内沿流道方向的阴极压力变化、电池电流密度以及阴极气态水浓度的分布情况.结论随着气体扩散层渗透率的增大,能有效降低电池阴极流道内的压降,进而改善电池内部传质、降低额外的功耗,提高电池电流密度以及增强阴极的排水能力.对HT-PEMFC结构的优化和设计具有重要的指导意义.In order to optimize parameters of fuel cell and improve its overall performance, affects of the gas diffusion layer porous medium permeation rate on the high temperature proton exchange membrane fuel cell（HT-PEMFC） were studies in this paper. Based on the software COMSOL Mul- tiphysics, the HT-PEMFC was simulated and analyzed under the working voltage of 0. 4V and dif- ferent gas diffusion layer permeation rates of 1.18 × 10^-12 m2,1.18 ×10^-11 m2,1.18 ×10-^10 m2 and 1.18 ×10^-9 m2. Pressure variations along the flow field in cathode,current densities of the fuel cell and distributions of the vaporous water concentration in cathode were obtained. It is found thatwith the increase of permeability of the gas diffusion layer, current density of the fuel cell and ca- pability of the drainage in cathode increase and the pressure drop in the flow field of the fuel cell reduces effectively, thereby the internal mass transfer of the fuel cell can be improved;the extra power consumption can be declined. Conclusion is that the simulation in this paper has an impor- tant guiding significance for structure optimization and design of the HT-PEMFC.

关 键 词：燃料电池 COMSOL 渗透率 压力变化 电流密度 水浓度分布 

分 类 号：TM911.4[电气工程—电力电子与电力传动]