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。本文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180A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%。基于此，对系统控制策略进行优化，经优化后的吹扫策略能保证排气总管平均氮气浓度低于4.0%，同时氢气利用率达到98%。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。

The anode system based on hydrogen recirculation can improve the hydrogen utilization efficiency and output perfor-mance of proton exchange membrane fuel cell (PEMFC) systems. Anode purging can alleviate the effects of nitrogen concentration increase and liquid water accumulation on the performance of the fuel cell stack, but it can cause periodic fluctuations in the working characteristics of the fuel cell stack. This article investigates the working characteristics of a PEMFC anode system with an injector and a circulating pump in parallel. Research has shown that under high operating conditions, the injector working alone can ensure the stable operation of the fuel cell stack, while under low operating conditions, a hydrogen circulation pump needs to be involved in the recirculation process to compensate for the insuffi-cient recirculation capacity of the injector. When the working current is less than 180A, start the circulating pump and the injector to work together. Compared with the injector mode, the anode inlet flow rate increases by 2.4% during the purging process, and the flow rate decreases by 71.5% after the purging is completed. To ensure a high hydrogen recirculation ratio, the average nitrogen concentration in the exhaust manifold should be controlled below 6%. Based on this, the sys-tem purging strategy is optimized, and the optimized purging strategy can ensure that the average nitrogen concentration in the exhaust manifold is below 4.0%, while the hydrogen utilization rate reaches 98%. The utilization rate of hydrogen and the average mole fraction of nitrogen in the exhaust manifold show a mutually exclusive relationship, and the duration of purging exceeds 1.5% of the cycle to meet the usage requirements.