Study on the influences of ionization region material arrangement on Hall thruster channel discharge characteristics  

作　　者：胡翔 段萍 宋继磊 李文庆 陈龙 边兴宇 

机构地区：[1]College of Science,Dalian Maritime University [2]Transportation Engineering Postdoctoral Research Station,Dalian Maritime University

出　　处：《Plasma Science and Technology》2018年第2期47-55,共9页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.11275034,11605021,11375039);the China Postdoctoral Science Foundation(Grant No.2017M621120);the Key Project of Science and Technology of Liaoning Province(Grant No.201601074);‘the Fundamental Research Funds for the Central Universities’(Grant No.3132017070)

摘　　要：There exists strong interaction between the plasma and channel wall in the Hall thruster,which greatly affects the discharge performance of the thruster.In this paper,a two-dimensional physical model is established based on the actual size of an Aton P70 Hall thruster discharge channel.The particle-in-cell simulation method is applied to study the influences of segmented low emissive graphite electrode biased with anode voltage on the discharge characteristics of the Hall thruster channel.The influences of segmented electrode placed at the ionization region on electric potential,ion number density,electron temperature,ionization rate,discharge current and specific impulse are discussed.The results show that,when segmented electrode is placed at the ionization region,the axial length of the acceleration region is shortened,the equipotential lines tend to be vertical with wall at the acceleration region,thus radial velocity of ions is reduced along with the wall corrosion.The axial position of the maximal electron temperature moves towards the exit with the expansion of ionization region.Furthermore,the electron-wall collision frequency and ionization rate also increase,the discharge current decreases and the specific impulse of the Hall thruster is slightly enhanced.There exists strong interaction between the plasma and channel wall in the Hall thruster,which greatly affects the discharge performance of the thruster.In this paper,a two-dimensional physical model is established based on the actual size of an Aton P70 Hall thruster discharge channel.The particle-in-cell simulation method is applied to study the influences of segmented low emissive graphite electrode biased with anode voltage on the discharge characteristics of the Hall thruster channel.The influences of segmented electrode placed at the ionization region on electric potential,ion number density,electron temperature,ionization rate,discharge current and specific impulse are discussed.The results show that,when segmented electrode is placed at the ionization region,the axial length of the acceleration region is shortened,the equipotential lines tend to be vertical with wall at the acceleration region,thus radial velocity of ions is reduced along with the wall corrosion.The axial position of the maximal electron temperature moves towards the exit with the expansion of ionization region.Furthermore,the electron-wall collision frequency and ionization rate also increase,the discharge current decreases and the specific impulse of the Hall thruster is slightly enhanced.

关 键 词：Hall thruster segmented electrode particle-in-cell wall material 

分 类 号：V439.4[航空宇航科学与技术—航空宇航推进理论与工程]