脊下横流对PEMFC性能影响的数值分析  

Numerical effect analysis of cross flow under rib on performance of PEMFC

作　　者：黄宗辉[1] 刘金玲[1] 杨代军[1] 

机构地区：[1]同济大学汽车学院新能源汽车工程中心,上海201804

出　　处：《电源技术》2015年第11期2406-2408,2425,共4页Chinese Journal of Power Sources

基　　金：国家"863"计划项目(2012AA051903);国家科技部科技支撑项目(2013BAG15B00);汉高基金教席

摘　　要：针对脊下横流对质子交换膜燃料电池(PEMFC)性能的影响建立了一个三维数学模型,模型中考虑了传质、传热和电化学反应,主要考察了诱发脊下横流对阴极氧气传质性能的影响。结果表明,通过诱发脊下横流,提高了阴极扩散层的氧气浓度和分布的均匀性,尤其是脊下的氧气浓度有较大的升高,同时还降低了脊下和流道下水浓度,改善了电池的水管理。结果显示脊下横流可以提高电池在高电流密度区域的性能,但在低电流密度区域对电池性能的影响较小。A three-dimensional mathematical model aiming at cross flow under the rib in PEMFC was developed. Mass transfer, heat transfer and electrochemical reaction were considered in the model. The effect of cross flow on cathode mass transfer was analyzed and discussed .The results show that the concentration and uniformity of oxygen in the cathode diffusion layer, and gas flow velocity under the rib are improved by strengthening cross flow, especially the oxygen concentration under the rib improves significantly. At the same time, concentration of water under the rib and under the channel decreases, resulting in better water management of the battery. And the results show that cross flow can improve the performance of PEMFC at high current density, but has little influence on the cell performance at low current density.

关 键 词：脊下横流 质子交换膜燃料电池 数学模型 传质 

分 类 号：TM911.4[电气工程—电力电子与电力传动]