摘要
A high-speed charge-coupled device camera was used to capture images of the plume and acceleration channel of a Hall effect thruster during ignition at different discharge voltages.To better understand the influence of changes in the discharge voltage on the plasma parameters during thruster ignition,a particle-in-cell numerical model was used to calculate the distribution characteristics of the ion density and electric potential at different ignition moments under different discharge voltages.The results show that when the discharge voltage is high,the ion densities in the plume and acceleration channel are significantly higher at the initial phase of thruster ignition;with the gradual strengthening of the ignition process,the propellant avalanche ionization during thruster ignition occurs earlier and the pulse current peak increases.The main reason for these phenomena is that the change in the discharge voltage results in different energy acquisitions of the emitted electrons entering the thruster channel.
作者
Wenbo LI
Liqiu WEI
Hong LI
Yongjie DING
Jianning SUN
Haikuo CAI
Daren YU
Shangmin WANG
Ning GUO
李文博;魏立秋;李鸿;丁永杰;孙建宁;蔡海阔;于达仁;王尚民;郭宁(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,People's Republic of China;Key Laboratory of Aerospace Plasma Propulsion,Ministry of Industry and Information Technology,Harbin 150001,People's Republic of China;Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,People's Republic of China)
基金
funded by National Natural Science Foundation of China(Nos.51736003 and 51777045)
the Foundation of Science and Technology on Vacuum Technology and Physics Laboratory of Lanzhou Institute of Physics(No.6142207190305)
the Science and Technology Innovation Projects of Hunan Province(Project No.2018RS3146 and Project No.2019RS1102)。