在不改变霍尔推力器特征尺寸的条件下为了提高其低功率时的性能,采用缩小通道局部通流面积的方法,利用增加电离区原子密度来提高工质利用率。实验结果表明,该方法能有效拓展低功率放电范围,控制工质电离过程,增加工质利用率,并提高霍尔推力器在低功率下的推力、比冲和效率性能。羽流发散角优化是后续变截面研究中需要重点关注的问题。 In order to improve its performance under low power without changing the characteristic size of Hall thruster, a method of reducing the local flow area of ​​the channel is adopted to increase the utilization ratio of the working substance by increasing the atomic density of the ionization region. The experimental results show that this method can effectively expand the range of low power discharge, control the ionization process of working fluid, increase the utilization ratio of working fluid and enhance the thrust, specific impulse and efficiency performance of Hall thruster under low power. Plume flow divergence optimization is the focus of attention in the follow-up study of variable section.