Experimental investigation of the polarityswitching process with different bipolar ionic liquid thruster operating frequencies  

作　　者：吴湘蓓 杨铖 罗嘉伟 沈岩 Xiangbei WU;Cheng YANG;Jiawei;Yan SHEN(School of Aeronautics and Astronautics,Sun Yat-sen University,Shenzhen 518107,People’s Republic of China;Shenzhen Key Laboratory of Intelligent Microsatellite Constellation,Shenzhen 518107,People’s Republic of China)

机构地区：[1]School of Aeronautics and Astronautics,Sun Yat-sen University,Shenzhen 518107,People’s Republic of China [2]Shenzhen Key Laboratory of Intelligent Microsatellite Constellation,Shenzhen 518107,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第6期1-13,共13页等离子体科学和技术（英文版）

基　　金：co-supported by the National Key R&D Program of China(No.2020YFC2201001);the Shenzhen Science and Technology Program(No.20210623091808026).

摘　　要：The bipolar ionic liquid thruster employs ionic liquid as a propellant to discharge positively and negatively charged high-energy particles under an alternating current(AC)power source,effectively suppressing electrochemical reaction and ensuring charge neutrality.Determining an optimal AC supply power source frequency is critical for sustained stable thruster operation.This study focuses on the emission characteristics of the ionic liquid thruster under varied AC conditions.The AC power supply was set within the frequency range of 0.5-64 Hz,with eight specific frequency conditions selected for experimentation.The experimental results indicate that the thruster operates steadily within a voltage range of±1470 to±1920 V,with corresponding positive polarity current ranging from 0.41 to 4.91μA and negative polarity current ranging from−0.49 to−4.10μA.During voltage polarity switching,an emission delay occurs,manifested as a prominent peak signal caused by circuit capacitance characteristics and a minor peak signal resulting from liquid droplets.Extended emission test was conducted at 16 Hz,demonstrating approximately 1 h and 50 min of consistent emission before intermittent discharge.These findings underscore the favorable impact of AC conditions within the 8-16 Hz range on the self-neutralization capability of the ionic liquid thruster.

关 键 词：space electric propulsion ionic liquid thruster bipolar operation mode FREQUENCY 

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]