流线型挡板对PEMFC性能的影响
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河北大学质量技术监督学院

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国家自然科学基金项目(面上项目,重点项目,重大项目),


Effect of streamlined baffles on PEMFC performance
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School of Quality and Technical Supervision, Hebei University

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    摘要:

    优化质子交换膜燃料电池(Proton exchange membrane fuel cell, PEMFC)的流道结构是强化反应气体传输及提升输出性能的一种重要方法。在PEMFC直流道中添加了一种新型流线型挡板结构,然后与矩形挡板进行了对比,并分析了流线型挡板的尾部长度对PEMFC传质特性的影响。最后在平行流场中添加流线型挡板,研究了挡板的分布方式对PEMFC性能的影响。结果表明,在直流道内添加挡板提高了挡板下方反应气体的流动速度,增加了扩散层中的反应气体总通量,PEMFC电流密度得到提高。当流线型挡板的尾部长度增加时,有利于减小挡板后方的涡流大小。此外,在平行流场中添加流线型挡板并采用交错分布时,增大了平行流场中的反应气体压降,提高了催化层中的反应气体浓度。当工作电压V=0.5 V时,采用交错分布平行流场的PEMFC电流密度比常规平行流场提高了3.4 %。

    Abstract:

    Proton exchange membrane fuel cell (PEMFC) is a green and sustainable power generation technology. Optimizing the flow channel structure of PEMFC is an important method to enhance the reaction gas transport and improve the output performance. A new streamlined baffle structure was added in the straight flow channel of PEMFC and compared with a rectangular baffle. The effect of the streamlined baffle’s tail length on the mass transfer characteristics of PEMFC was also analyzed. Finally, the streamlined baffles were added in the parallel flow field, and the effect of the baffles’ distribution on the PEMFC performance was investigated. The results showed that adding baffles in the straight flow channel increased the reaction gas’s flow velocity below the baffles, increased the total flux of the reaction gas in the gas diffusion layer, and improved the PEMFC current density. It is beneficial to reduce the size of the vortex behind the baffle when the streamlined baffle’s tail length increases. In addition, the pressure drop of the reaction gas in the parallel flow field was raised and the concentration of the reacting gas in the catalytic layer was increased when streamlined baffles were added to the parallel flow field and the baffles were staggered. The current density of the PEMFC with the parallel flow field increased by 3.4 % compared with the conventional parallel flow field when the operating voltage is 0.5 V.

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  • 收稿日期:2022-06-29
  • 最后修改日期:2022-07-21
  • 录用日期:2022-07-20
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