该文基于仿生思想设计一种耦合螺旋线结构与花瓣分形的新型仿生流场（BFF）,并将提出的BFF与传统单蛇流场（1SFF）、五蛇流场（5SFF）和平行流场（PFF）的PEMFC峰值功率密度、水气传输特性、电流密度分布以及压降等性能指标进行对比分析。研究结果表明：0.6 V工作电压下,BFF的氧气质量分数平均值比PFF高67.9%,水质量分数平均值相较于PFF降低23.9%,两项均匀性指数达到0.9高于其他3种流场;BFF各界面层的平均膜态水含量小于其余3种流场,有效地去除生成产物水;BFF显著地降低压降,整体压降仅为PFF的16.7%。BFF峰值功率密度分别比1SFF高3.7%、比5SFF高5.5%、比PFF高30.1%。
Abstract
This paper proposs a new bionic flow field （BFF） that integrates a spiral structure and petal-like fractals based on biomimetic principle, and compares the proposed BFF with the traditional single serpentine flow field （1SFF）, five snake flow field （5SFF） and parallel flow The performance indicators of PEMFC such as peak power density, water vapor transmission characteristics, current density distribution and pressure drop are compared and analyzed. The research results show that： under the operating voltage of 0.6 V, the average oxygen mass fraction of BFF is 67.9% higher than that of PFF, the average water mass fraction is 23.9% lower than that of PFF, and the uniformity index is higher than that of the other three flow fields, reaching 0.9; The membrane water content of each interface layer of BFF is less than that of the other three flow fields, effectively removing the product water; BFF significantly reduces the pressure drop, and the overall pressure drop is only 16.7% of PFF. The peak power density of BFF is 3.7% higher than 1SFF, 5.5% higher than 5SFF, and 30.1% higher than PFF.
关键词
质子交换膜燃料电池（PEMFC） /
流场 /
数值模拟 /
仿生设计 /
水管理
Key words
proton exchange membrane fuel cell （PEMFC） /
flow field /
numerical simulation /
bionic design /
water management
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