可调式引射器关键结构参数影响规律研究

Key structural parameters of an adjustable ejector and their influence on its performance

引射器可以提高燃料电池的效率,为提高引射器的性能及拓宽适用工况范围,本文围绕可调式引射器关键结构参数对引射器性能的影响规律展开研究,建立引射器的三维流动分析模型。基于验证后的模型研究了7种关键结构参数对引射器性能的影响规律,在此基础上对引射器结构进行优化,选取最佳结构参数。通过试验对比优化前后引射器的性能,结果表明:可调引射器的引射系数较原引射器提高了6.2%,工作区间从120~300 A拓展至60~300 A,有效拓宽了引射器的低负荷工况范围。本文的研究成果可为引射器的优化设计提供指导。

An ejector can significantly improve the efficiency of fuel cells.To improve the performance of an ejector and broaden the range of applicable working conditions,this paper highlights the influence of key structural parameters of an adjustable ejector on its performance.The ejector′s three-dimensional flow analysis model has been established for its study.Based on the verified model,the influence of seven key structural parameters on the performance of an ejector has been studied.Furthermore,the structure of the ejector has been optimized to work with the best structural parameters.The performance of the ejector,before and after optimization,has been compared with an experimental model.The results show that the ejector coefficient of an adjustable ejector increases by 6.2%in comparison to the original ejector.The working range of the adjustable ejector also extends from 120~300 A to 60~300 A,effectively broadening the range of low load conditions of the ejector.The results of this study can assist in the optimization of ejector design.