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首页> 外文期刊>The International Journal of Environmental Studies >Flow uniformity in and its effect on the performance of polymer electrolyte membrane fuel cell stacks
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Flow uniformity in and its effect on the performance of polymer electrolyte membrane fuel cell stacks

机译：流动均匀性及其对高分子电解质膜燃料电池堆性能的影响

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摘要

In this work the effect of flow uniformity on a PEM fuel cell stack performance has been investigated to optimize the stack design. Based on the hydraulic resistance network method, a correlation for the ratio of pressure drop in flow channel, to that in stack manifold, has been derived analytically as a measure of flow uniformity among the cells in the stack. It has been shown that the amount of flow variation can be predicted via the pressure drop ratio, and is found that they are inversely proportional to each other. The results indicate that the output voltage degrades rapidly as the amount of flow variance is increased. Sufficient flow uniformity is crucial to minimize the cell-to-cell voltage variation. However, the space available for the manifold is limited on bipolar plate and excessive flow uniformity may result in net performance degradation either due to a reduction in the active cell area or excessive pumping power. Optimization has been carried out based on net output power which is obtained by subtracting the pumping powers for the anode and cathode streams from the stack output power. The effect of minor loss on cell-to-cell voltage variation as well as stack output voltage has been investigated and it may become considerable when the number of flow channels per bipolar plate is small.
机译：在这项工作中，已经研究了流量均匀性对PEM燃料电池堆性能的影响，以优化堆设计。基于水力阻力网络方法，已通过分析得出了流道中压降与电池组歧管中压降之比的相关性，以此作为电池组中电池间流动均匀性的量度。已经表明，可以通过压降比来预测流量变化量，并且发现它们彼此成反比。结果表明，随着流量变化量的增加，输出电压迅速下降。足够的流动均匀性对于最小化电池间电压变化至关重要。但是，可用于歧管的空间限制在双极板上，并且过大的流量均匀性可能会导致有源单元面积减少或泵浦功率过大而导致净性能下降。基于净输出功率进行了优化，该净输出功率是通过从电池组输出功率中减去阳极和阴极流的泵浦功率而获得的。已经研究了微小损耗对电池间电压变化以及电池组输出电压的影响，当每个双极板的流道数量较小时，这种影响可能会变得相当大。

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