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Influences of bipolar plate channel blockages on PEM fuel cell performances

机译：双极板通道阻塞对PEM燃料电池性能的影响

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摘要

In this paper, the effect of partial- or full-block placement along the flow channels of PEM fuel cells is numerically studied. Blockage in the channel of flow-field diverts the flow into the gas diffusion layer (GDL) and enhances the mass transport from the channel core part to the catalyst layer, which in turn improves the cell performance. By partial blockage, only a part of the channel flow is shut off. While in full blockage, in which the flow channel cross sections are fully blocked, the only avenue left for the continuation of the gas is to travel over the blocks via the porous zone (GDL). In this study, a 3D numerical model consisting of a 9-layer PEM fuel cell is performed. A wide spectrum of numerical studies is performed to study the influences of the number of blocks, blocks height, and anode/cathode-side flow channel blockage. The results show that the case of full blockage enhances the net electrical power more than that of the partial blockage, in spite of higher pressure drop. Performed studies show that full blockage of the cathode-side flow channels with five blocks along the 5 cm channel enhances the net power by 30%. The present work provides helpful guidelines to bipolar plate manufacturers. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在本文中，数值研究了沿PEM燃料电池流动通道的部分或全部块体放置的影响。流场通道中的阻塞将流转移到气体扩散层（GDL）中，并增强了从通道核心部分到催化剂层的质量传输，进而提高了电池性能。通过部分阻塞，仅一部分通道流量被切断。在完全堵塞的情况下，其中的流动通道横截面被完全堵塞，剩下的唯一的气体继续通行途径是通过多孔区（GDL）越过块体。在这项研究中，执行了一个由9层PEM燃料电池组成的3D数值模型。进行了广泛的数值研究，以研究块数量，块高度和阳极/阴极侧流道阻塞的影响。结果表明，尽管压降较高，但完全堵塞的情况比部分堵塞的情况更能提高净电功率。进行的研究表明，沿5 cm通道的五个阻塞完全阻塞了阴极侧流动通道，可使净功率提高30％。本工作为双极板制造商提供了有用的指导。 （C）2016 Elsevier Ltd.保留所有权利。

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