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首页> 外文期刊>Renewable energy >Effects of vortexes in feed header on air flow distribution of PEMFC stack: CFD simulation and optimization for better uniformity
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Effects of vortexes in feed header on air flow distribution of PEMFC stack: CFD simulation and optimization for better uniformity

机译：涡流在PEMFC堆栈空气流分布上的饲料标题中的影响：CFD仿真和优化以获得更好的均匀性

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Distribution uniformity is critical to achieve high performance for proton exchange membrane fuel cell (PEMFC) stacks. In this work, air flow distribution of a 30 kW "U-type" stack of 100 unit cells is investigated by computational fluid dynamics (CFD) simulation, Burgers vortex model is introduced to describe the mechanism of flow maldistribution. Three cases are presented to evaluate the effects of vortexes on the distribution uniformity under various average current densities, and obtain optimized design for better uniformity. The results show that the vortexes usually generate in the feed header, the flow vortex structures are governed by the feed header's configuration. The distribution uniformity reduces dramatically with the increase of current density and the generation of vortexes. The cells that locate in the positions of vortexes get less flow allocation than other cells, distribution uniformity can improve by optimizing the feed header's configuration to change the vortex structure of flow field. (C) 2021 Published by Elsevier Ltd.
机译：分布均匀性对于实现质子交换膜燃料电池（PEMFC）堆叠的高性能至关重要。在这项工作中，通过计算流体动力学（CFD）仿真研究了30 kW“U型”叠加的30kW“U型”堆叠的空气流量分布，介绍了汉堡涡流模型，以描述流动效果的机制。提出了三种案例来评估涡旋对各种平均电流密度下的分布均匀性的影响，并获得优化的设计，以获得更好的均匀性。结果表明，涡旋通常在进料标题中生成，流量涡流结构由进料标题的配置管理。随着电流密度的增加和涡旋的产生，分布均匀性显着降低。定位在涡旋位置的细胞比其他电池的流量分配更少，可以通过优化进料头的配置来改变流场的涡流结构来改善分布均匀性。 （c）2021由elestvier有限公司出版

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