质子交换膜燃料电池五边形挡板流场结构优化与性能改进  

Flow Field Structure Optimization and Performance Improvement with Pentagon Baffle for Proton Exchange Membrane Fuel Cell

作　　者：陈吉清[1,2] 曾常菁 周云郊[1,2] 兰凤崇[1,2] 刘青山 Chen Jiqing;Zeng Changjing;Zhou Yunjiao;Lan Fengchong;Liu Qingshan(School of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou 510640;South China University of Technology,Guangdong Province Key Laboratory of Vehicle Engineering,Guangzhou 510640)

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640 [2]华南理工大学,广东省汽车工程重点实验室,广州510640

出　　处：《汽车工程》2023年第10期1862-1875,共14页Automotive Engineering

基　　金：广东省自然科学基金(2021A15150912)资助。

摘　　要：为有效提高燃料电池(fuel cell,FC)的性能,提出一种在阴极处具有五边形挡板的新型流场(flow field,FF)设计。为了解五边形挡板的加入对FC内部传质过程的影响,开发了一个三维、多相、非等温稳态模型,将多孔层结构引起的各向异性传输性质和催化层实际团聚体结构的非均质特性耦合到模型中,研究了挡板高度变化时FC性能的变化。结果表明,五边形挡板增强了流道的传质性能与气体分布均匀性。随着挡板高度增加,流道的传质性能、排水性能以及气体分布均匀性增加,高度100%(H100)的挡板由于与气体扩散层直接接触,堵塞了排水通道,因此其保水性能最好。在相对湿度为50%情况下,H100的FF结构具有最大的净功率密度,与原始FF(H0)相比,净功率密度增加17.778%。In order to effectively improve the performance of proton exchange membrane fuel cell(PEM‐FC),a new flow field(FF)design with pentagonal baffle at the cathode is proposed.In order to fully understand the influence of the addition of pentagonal baffles on the mass transfer process within the fuel cell(FC),a three-dimen‐sional,multiphase and non-isothermal steady-state model is developed,embedding the anisotropic transport proper‐ties caused by the porous layer structures and the heterogeneous model of the actual agglomerate structure of the cat‐alyst layer in the model,studying the changes in FC performance when the height of the baffles changes.The results show that the pentagon baffle enhances the mass transfer performance and gas distribution uniformity.With the in‐crease of the baffle height,the mass transfer performance,drainage performance and gas distribution uniformity of the flow channel increase.The baffle with a height of 100%(H100)blocks the drainage channel due to its direct contact with the gas diffusion layer,so its water retention performance is the best.Under the condition of relative hu‐midity of 50%,the FF structure with H100 baffle has the maximum net power density,which is 17.778%higher than the original FF(H0).

关 键 词：质子交换膜燃料电池 五边形挡板 挡板高度 各向异性 催化层团聚体模型 非等温 

分 类 号：TM911.4[电气工程—电力电子与电力传动]