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首页> 外文期刊>Journal of power sources >Local transport phenomena and cell performance of PEM fuel cells with various serpentine flow field designs
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Local transport phenomena and cell performance of PEM fuel cells with various serpentine flow field designs

机译：具有各种蛇形流场设计的PEM燃料电池的局部运输现象和电池性能

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摘要

The flow field design in bipolar plates is very important for improving reactant utilization and liquid water removal in proton exchange membrane fuel cells (PEMFCs). A three-dimensional model was used to analyze the effect of the design parameters in the bipolar plates, including the number of flow channel bends, number of serpentine flow channels and the flow channel width ratio, on the cell performance of miniature PEMFCs with the serpentine flow field. The effect of the liquid water formation on the porosities of the porous layers was also taken into account in the model while the complex two-phase flow was neglected. The predictions show that (1) for the single serpentine flow field, the cell performance improves as the number of flow channel bends increases; (2) the single serpentine flow field has better performance than the double and triple serpentine flow fields; (3) the cell performance only improves slowly as the flow channel width increases. The effects of these design parameters on the cell performance were evaluated based on the local oxygen mass flow rates and liquid water distributions in the cells. Analysis of the pressure drops showed that for these miniature PEMFCs, the energy losses due to the pressure drops can be neglected because they are far less than the cell output power.
机译：双极板中的流场设计对于提高质子交换膜燃料电池（PEMFC）中的反应物利用率和去除液态水非常重要。使用三维模型来分析双极板中设计参数的影响，包括流道弯曲的数量，蛇形流道的数量和流道宽度比，对带有蛇形的小型PEMFC的电池性能的影响流场。模型中还考虑了液态水形成对多孔层孔隙率的影响，而忽略了复杂的两相流。预测表明：（1）对于单一的蛇形流场，单元性能随着流道弯曲数的增加而提高； （2）单蛇形流场的性能优于双蛇形和三蛇形流场。 （3）单元性能仅随着流道宽度的增加而缓慢提高。这些设计参数对电池性能的影响是根据电池中的局部氧气质量流速和液态水分布进行评估的。对压降的分析表明，对于这些微型PEMFC，由于压降引起的能量损失远小于电池的输出功率，因此可以忽略不计。

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