低功率霍尔推力器阳极供气环工程设计关键参数仿真

为了提高低功率霍尔推力器放电通道内中性原子分布均匀性,采用有限元方法对阳极供气环关键结构参数进行优化研究。针对双腔式阳极供气环结构,重点分析了缓冲腔容积比以及缓冲腔隔板导流小孔数量等关键参数对阳极供气均匀性的影响。研究结果表明:随着缓冲腔容积比的增大,阳极供气环出气孔差异率先快速减小后趋于稳定,其中当容积率k=1.0时,平均差异率和最大差异率分别为1.77%和3.79%；隔板间导流小孔数量从8增加到14时,出气孔差异率呈现浴盆曲线特性,其中导流孔数量为10时,平均差异率和最大差异率分别为1.8%和3.8%。研究结果可为霍尔推力器阳极供气环工程设计提供理论支撑。

Simulation of key parameters in engineering design of anode gas distribution ring of low-power Hall thruster

In order to improve the uniformity of the neutral atom distribution in the discharge channel of the low-power Hall thruster, the finite element method was used to optimize the key structural parameters of the anode gas distribution ring. Aiming at the double-chamber anode gas distribution ring structure, the influence of key parameters such as the volume ratio of the buffer chambers and the number of diversion holes between the buffer chamber partitions on the uniformity of anode gas supply was analyzed. The research results show that with the increase of the volume ratio, the difference of the anode gas distribution ring outlet pores decreases rapidly and then stabilizes. When the ratio k=1.0, the average difference rate and the maximum difference rate are 1.77% and 3.79%, respectively; when the number of diversion holes between the buffer chamber partitions increases from 8 to 14, the difference rate of the air outlets shows the characteristics of the bathtub curve, and when number of the diversion holes is 10, the average difference rate and the maximum difference rate are 1.8% and 3.8%, respectively. The research results can provide theoretical support for the engineering design of the anode gas distribution ring of the Hall thruster.