摘要
质子膜内水分和阴极多孔电极中液态水含量是PEM燃料电池正常运行的控制因素。本文给出了一个用于研究PEM燃料电池内水迁移的稳态、等温、两相流模型。模型耦合了连续方程、动量守恒方程和物质守恒方程,以及水在质子膜中传递方程。运用试验结果验证了模型的有效性。分析模拟结果表明,增大系统操作压力、升高电池操作温度和降低加湿温度将会使质子膜中水的净迁移通量增大;增大操作压力、降低操作温度和升高加湿温度会增加阴极CTL与GDL界面上液态水含量。
Water content in the membrane and liquid water content in the porous cathode have significant effects on the performance of PEM fuel cells. A steady state isothermal two-phase flow model is presented in this paper to study water transport in PEM fuel cells. This model couples the conservation of mass, momentum and species equations as well as water transport equation in the membrane. Simulation results indicate that the polarization curves agree well with experimental data, and that higher operating pressure and temperature of a PEM fuel cell as well as lower humidification temperature of reactants lead to the increase of net water transport flux across the membrane; higher operating pressure, higher humidification temperature and lower operating temperature result in the increase of liquid water content at the interface of CTL and GDL.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2005年第2期257-260,共4页
Journal of Engineering Thermophysics
基金
国家杰出青年科学基金B类(No.50228606)国家自然科学基金项目资助(No.90210027)
关键词
质子交换膜
燃料电池
水迁移
操作参数
proton exchange membrane
fuel cell
water transport
operating parameter
