摘要
风冷燃料电池在无人机上应用具有较大的优势,但其仍然面临着性能低、水热管理复杂等问题。采用数值模拟研究了阴阳极流道顺流、逆流以及交叉流布置方式对风冷燃料电池性能的影响,讨论了各物理量之间的耦合机制。研究发现阴极流道布置对风冷燃料电池关键物理量分布影响显著,受水含量分布不均影响,交叉流布置催化层中电流密度呈现孤立点状分布,相较于顺流流道布置与逆流流道布置,交叉流流道布置具有较好的热管理特性,能够显著提高膜电极中水含量,继而提升风冷燃料电池性能,在0.6 V操作电压下,交叉流流道布置电流密度相比较顺流流道设计提升了约20%,此外研究还发现,环境相对湿度的降低会显著降低风冷燃料电池性能。
Air-cooled fuel cells have great advantages in unmanned aerial vehicle application,but they still face problems such as low performance and complex water and heat management.In this study,effects of co-flow,counter-flow and cross-flow gas channel arrangements on the performance of air-cooled fuel cell are studied.The coupling mechanism between various physical quantities is also discussed.It is found that gas channel arrangements have a significant influence on the distribution of key physical quantities of air-cooled fuel cells.Affected by the uneven distribution of dissolved water content,the current density distribution in the cathode catalytic layer of cross-flow arrangement presents an isolated point distribution.Due to good thermal management of cross-flow gas channel arrangement,it can significantly improve the water content of membrane electrode,and then improve the cell performance.Under the operating voltage of 0.6 V,the current density of cross-flow gas channel arrangement is 20%higher than that of co-flow gas channel arrangement.In addition,it is also found that the reduction of ambient humidity will significantly reduce the performance of air-cooled fuel cells.
作者
彭明
夏强峰
蒋理想
张瑞元
郭凌燚
陈黎
陶文铨
PENG Ming;XIA Qiangfeng;JIANG Lixiang;ZHANG Ruiyuan;GUO Lingyi;CHEN Li;TAO Wenquan(Key Laboratory of Thermal Fluid Science and Engineering of MOE,School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;Jiaxing Power Supply Company of State Grid,Jiaxing 314000,Zhejiang,China)
出处
《化工学报》
EI
CSCD
北大核心
2022年第10期4625-4637,共13页
CIESC Journal
基金
国家重点研发计划项目(2021YFB4001701)
陕西省杰出青年科学基金项目(2019JC-01)。
关键词
燃料电池
数值模拟
传递过程
流场设计
水热管理
fuel cells
numerical simulation
transport processes
flow field design
water and thermal management
