基于氢气再循环的阳极系统能够提高质子交换膜燃料电池（PEMFC）系统的氢气利用率和输出性能。阳极吹扫能缓解氮气浓度升高和液态水积累对电堆性能的影响，但会使电堆工作特性发生周期性波动。针对引射器与循环泵并联的PEMFC阳极系统工作特性进行了研究。研究表明，高工况下引射器单独工作即可保障电堆的稳定运行，低工况下则需氢气循环泵介入再循环过程从而弥补引射器再循环能力的不足。在工作电流小于180 A时启动循环泵与引射器共同工作，在吹扫过程中相比引射器模式阳极入口流速提升2.4%，吹扫结束后流速下冲减小71.5%。为保证较高的氢气再循环比，应控制排气总管平均氮气浓度低于6%。基于氢气利用率和氮气浓度对系统吹扫策略进行正交优化，结果表明，氢气利用率和排气总管平均氮气摩尔分数表现出互斥关系，吹扫持续时间超过吹扫周期的1.5%即可满足系统使用需求，经优化后的吹扫策略能保证氢气利用率达到98%的同时，排气总管平均氮气浓度在约4.0%。

The anode system based on hydrogen recycling can improve the hydrogen utilization and output performance of Proton Exchange Membrane Fuel Cell （PEMFC） system. The effect of increasing nitrogen concentration and liquid water accumulation on the performance of the reactor can be alleviated by anode purge， but the working characteristics of the reactor will fluctuate periodically. In this paper， the operational？ characteristics of PEMFC anode system with ejector and circulating pump in parallel are studied. The results show that the ejector alone can guarantee the stable operation of the reactor under high working conditions， and the hydrogen circulating pump was required to intervene in the recirculation process to make up for the insufficient recirculation capacity of the ejector under low working conditions. When the working current was less than 180 A， the circulating pump and ejector work together. During the purge process， the inlet velocity of the anode in the ejector mode was increased by 2.4%， and after the purge， the flow rate was reduced by 71.5%. To ensure a high hydrogen recirculation ratio， the average nitrogen concentration in the exhaust pipe should be controlled below 6%. In this study， the orthogonal optimization of the purge strategy of the system was carried out based on the hydrogen utilization rate and nitrogen concentration. The results showed that the hydrogen utilization rate and the average nitrogen molar fraction of the exhaust pipe showed a mutually exclusive relationship， and the purge duration exceeded 1.5% of the purge cycle to meet the needs of the system. The optimized purge strategy can ensure that the hydrogen utilization rate reached 98%. The average nitrogen concentration in the exhaust manifold was about 4.0%.