为提高质子交换膜燃料电池系统引射器的引射性能，基于一款燃料电池系统的阳极氢气循环需求设计了一款引射器，并通过搭建CFD仿真模型，以引射器的5个关键参数为变量，结合燃料电池系统氢气子系统实际工况，分析引射器的关键尺寸参数变化对引射器性能的影响，获得了最优的引射器尺寸参数。以仿真优化结果为基础试制了一个样件，同时试制了4个对比样件进行对比测试。结果表明：混合段直径、喷嘴与混合段距离、混合段长度3个设计参数对引射器性能的影响最大，混合段直径、喷嘴与混合段的距离对应不同工况都有一个最优值；引射器二次侧入口氢气中含有的大量氮气和水蒸气，对引射器的计量比有很大的影响；相比之下，仿真优化后的引射器在不同工况都具有最优引射性能。

In order to improve the ejector performance of proton exchange membrane fuel cell system, an ejector was designed based on the requirements of anode hydrogen cycle of fuel cell. By building a CFD simulation model, the influence of the key size parameters of the ejector on the performance of the ejector was analyzed by taking five key parameters of ejector as variables and combining with the actual conditions of hydrogen subsystem of fuel cell system, and the optimal size parameters of the ejector were acquired. Based on the results of simulation optimization, one reference sample was manufactured, and four comparative samples were produced for comparative testing. The results show that the mixing section diameter, the distance between the nozzle and the mixing section, and the mixing section length have the greatest influence on the performance of ejector, and there always exists an optimal value under different working conditions for the mixing section diameter and the distance between the nozzle and the mixing section. A large amount of nitrogen and water vapor in the secondary inlet hydrogen of ejector has a great influence on the metering ratio of the ejector. In contrast, the optimized ejector has the best ejector performance under different working conditions.