燃料电池氢气引射器运行性能研究
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1.中车青岛四方机车车辆股份有限公司;2.广东国鸿氢能科技有限公司

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TM911.4

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Numerical Analysis of Operation Performance for Using of Ejector in PEMFC System
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1.CRRC Qingdao Sifang Locomotive &2.Rolling Stock Co LTD;3.Guangdong SinoSynergy Hydrogen Power Technology Co,Ltd

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    摘要:

    为了研究氢气引射器在燃料电池系统中的匹配问题,本文针对某燃料电池系统运行工况,优化设计了氢气引射器的几何结构,建立了氢气引射器的二维数值CFD计算模型,研究了不同运行条件下的引射器性能,发现引射器在流体温度、湿度、压力、流量均对引射器的引射性能有影响,特别是二次流的温度、压力和相对湿度对引射器的性能更加敏感,环境温度也对引射率存在一定影响,环境温度越高,引射率越低,引射器效率。同时,分析了引射器与电堆运行工况的匹配性能,结果表明所设计的引射器可在燃料电池大部分功率范围内运行,引射率可以满足电堆需求,且效率均高于10%;相比于氢气循环泵,使用氢气引射器后系统效率在中、大电流下可提高0.1%以上,最大提高0.17%。

    Abstract:

    In order to explore performance of an ejector used in proton exchange membrane fuel cell system, a hydrogen ejector was optimized and the two-dimensional numerical CFD calculation model of the hydrogen ejector was established, based on the operating conditions of the PEMFC system. Then, the performance under different operating conditions was studied, it was found that fluid temperature, humidity, pressure and mass flow have a great effect on the performance of the ejector, especially those related to secondary flow. And the environmental temperature also affects the entrainment ratio,the higher environmental temperature, the lower the entrainment ratio. Furthermore, the matching performance of the ejector used on PEMFC is analyzed. The results show that the ejector can operate in a wide power range of the PEMFC system with the ejector, its entrained flow can meet the requirements of the stack, and the efficiency is higher than 10%. Comparing with the conventional hydrogen recirculating pump, the system efficiency can be increased by more than 0.1% at medium and large currents by using the ejector, and the maximum increase is 0.17%.

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张文超,卜庆元. 燃料电池氢气引射器运行性能研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-06-23
  • 最后修改日期:2021-11-18
  • 录用日期:2021-11-22
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