摘要
水管理是影响质子交换膜燃料电池(PEMFC)工作性能以及工作效率的关键技术,是国内外研究热点。PEMFC中的阴极流道存在较为复杂的水淹问题,需要从机理层面分析解决。利用流体体积函数(VOF)模型对液态水在电池流道内的气液两相流动问题进行深入的模拟研究,结果表明:疏水性壁面由于附着力小,更适合作为气体扩散层(GDL)表面;侧壁需要比GDL表面更为亲水的壁面材料,以加快生成的液态水脱离GDL表面,但是过于亲水的壁面反而会形成环状流,阻碍反应气的输运。GDL表面使用疏水性较强的材料、流道侧壁使用亲水性材料能够提高燃料电池水管理的效率。
Water management is a key technology that affects the performance and efficiency of PEMFC fuel cell,which is a research hotspot at home and abroad.There is a complicated flooding problem in the cathode passage of PEMFC,which needs to be analyzed and solved from the mechanism level.In this paper,the VOF model was used to conduct in-depth simulation research on the gas-liquid two-phase flow of liquid water in the battery channel.The results show that the hydrophobic wall surface is more suitable as the surface of GDL.The side wall needs more hydrophilic wall material than the surface of GDL,so as to accelerate the separation of generated liquid water from the surface of GDL and improve the working efficiency and performance of the battery.However,excessively hydrophilic wall will instead form annular flow and hinder the transport of reaction gas.The surface of GDL was made of materials with strong hydrophobicity,and the side wall of the flow channel was made of materials with hydrophilicity,which would improve the efficiency of fuel cell water management.
作者
胡弦
黄豪中
雷涵
HU Xian;HUANG Hao-zhong;LEI Han(College of Mechanical Engineering,Guangxi University,Nanning Guangxi 530004,China)
出处
《电源技术》
CAS
北大核心
2020年第11期1616-1618,1633,共4页
Chinese Journal of Power Sources
基金
国家自然科学基金项目(51966001)。
