该研究建立质子交换膜燃料电池组合流场的三维模型,并探究流场的操作条件和几何参数对电池性能的影响。结果表明：斜坡流场的氧气和电流密度分布较平行和蛇形流场更均匀,电池输出功率密度分别比蛇形流场和平行流场提升了7.43%和12.05%。提高工作压力可增加流道的氧气浓度进而提升电池输出性能,而温度对电池性能的影响受流场结构的制约较小。当流场的流道数量过少会造成氧气分布不均从而降低电池输出性能,提高流道肋宽比能提升输出性能,但流道宽高比的提高对性能影响较小。
Abstract
This study developed a three-dimensional model of a composite flow field in proton exchange membrane fuel cells （PEMFCs） to investigate the effects of operating conditions and geometric parameters of the flow field on cell performance. The findings reveal that oxygen distribution and current density in the inclined flow field are more uniform compared to the parallel and serpentine flow fields. The cell’s power density output is improved by 7.43% and 12.05% in the inclined flow field relative to the serpentine and parallel configurations, respectively. Higher operating pressures increase oxygen concentration within the channels, leading to enhanced cell output performance, while temperature shows a relatively minor influence due to the structural limitations of the flow field. A reduced number of channels in the flow field leads to uneven oxygen distribution, thereby diminishing the cell's performance. Increasing the rib-to-channel width ratio improves output performance, while changes in the channel aspect ratio show minimal impact on performance.
关键词
质子交换膜燃料电池 /
流场 /
数值模型 /
结构优化
Key words
proton exchange membrane fuel cells /
flow field /
numerical model /
structural optimization
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基金
国家自然科学基金（52366014）; 海南省自然科学基金（521RC492）; 海南省教育厅项目（Qhys2023-86）
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