汽车工程 ›› 2023, Vol. 45 ›› Issue (10): 1862-1875.doi: 10.19562/j.chinasae.qcgc.2023.10.008
所属专题: 新能源汽车技术-动力电池&燃料电池2023年
陈吉清1,2,曾常菁1,2,周云郊1,2,兰凤崇1,2(),刘青山1,2
收稿日期:
2023-03-08
修回日期:
2023-03-28
出版日期:
2023-10-25
发布日期:
2023-10-23
通讯作者:
兰凤崇
E-mail:lfc1301@hotmail.com
基金资助:
Jiqing Chen1,2,Changjing Zeng1,2,Yunjiao Zhou1,2,Fengchong Lan1,2(),Qingshan Liu1,2
Received:
2023-03-08
Revised:
2023-03-28
Online:
2023-10-25
Published:
2023-10-23
Contact:
Fengchong Lan
E-mail:lfc1301@hotmail.com
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%。
陈吉清,曾常菁,周云郊,兰凤崇,刘青山. 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[J]. 汽车工程, 2023, 45(10): 1862-1875.
Jiqing Chen,Changjing Zeng,Yunjiao Zhou,Fengchong Lan,Qingshan Liu. Flow Field Structure Optimization and Performance Improvement with Pentagon Baffle for Proton Exchange Membrane Fuel Cell[J]. Automotive Engineering, 2023, 45(10): 1862-1875.
表5
PEMFC的操作条件和物理/电化学参数"
项目 | 参数 | 数值 | 参考文献 | 参数 | 数值 | 参考文献 |
---|---|---|---|---|---|---|
操作条件 | 操作温度/K | 353.15 | 阳极/阴极入口相对湿度/% | 50 | ||
阳极/阴极操作压力/atm | 1 | 阳极/阴极化学计量比 | 1.5, 2.0 | |||
物理/电化学参数 | 液态水黏度/(Pa·s) | 1.002e-3 | 液态水和水蒸气之间的 相变速率/s-1 | 100 | ||
液态水、干燥PEM密度/(kg·m-3) | 988, 2 000 | PEM的等效质量/ (kg·mol-1) | 1.1 | |||
表面张力/(N·m-1) | 0.062 5 | 阳极/阴极电荷转移系数 | 0.5, 0.5 | |||
膜膨胀系数 | 1.26e-2 | CC, CL的电导率/(S·m-1) | 2e4, 5 000 | |||
O2, H2, N2摩尔质量/(kg·mol-1) | 3.2e-2, 2e-3, 2.8e-2 | GDL, MPL, CL的 接触角/(°) | 120, 110, 100 | |||
CC, GDL, MPL, CL, PEM比热/(J·kg-1·K-1) | 875, 710, 710, 710, 2 000 | CL, PEM的固有渗透率/m2 | 1.0e-13, 2.0e-20 | |||
H2, O2的浓度指数 | 0.5, 1 | 阳极参考交换电流密度/(A·m-2) | 100 | |||
阻塞的水饱和度指数 | 2.5 | MPL的热导率/ (W·m-1·K-1) | IP: 1, TP: 0.6 | |||
传输电流的孔隙阻塞 | 2.5 | MPL的电导率/(S·m-1) | IP: 1 978, TP: 885 | |||
接触电阻/(Ω·m-2) | 2e-6 | 离聚物弯曲度 | 0.7 | |||
CC, GDL, MPL, CL, PEM密度/(kg·m-3) | 1 880, 490, 1 250, 2 010, 1 980 | O2, H2密度/(kg·m-3) | 1.29, 0.089 9 | |||
离聚物体积分数 | 0.4 | MPL的固有渗透率/m2 | IP: 1.0e-12, TP:3.3e-13 | [ | ||
阴极CL结块半径 | 1.0e-7 | 阴极/阳极Pt消耗/(kg·m-2) | 0.003, 0.001 | |||
O2, H2, N2, H2O热导率/(W·m-1·K-1) | 0.029 6, 0.204 0, 0.029 3, 0.023 7 | 阴极/阳极C消耗/ (kg·m-2) | 0.006 | |||
H2O 在阳极、阴极GCs内的扩散率/(m2·s-1) | 5.457e-5, 2.236e-5 | 可逆电势/V | 1.2 | |||
H2, O2, H2O(vapor)的 黏度/(kg·m-1·s-1) | 8.411e-6,1.919e-5, 1.34e-5 | 传热系数/ (W·m-2·K-1) | 20 |
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