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Investigation of the Instability Phenomena in Hall Thrusters for Practical Application

霍尔推进器不稳定现象的研究及其实际应用

基本信息

批准号：
09450367
负责人：
ARAKAWA Yoshihiro
金额：
$ 10.11万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The purpose of this study is to clarify the factor of discharge vibration and oscillating current as a problem in the durability on the Hall-current type thruster for space rocket propulsion with compact, light-weight and high thruster performance.The 1kW-class Hall thruster was designed and fabricated to investigate the oscillation problem by measuring discharge voltage and discharge current, and using by electrostatic probes, ion collectors, spectrum analyzers. The dependence of power level, propellant mass flow 'rate on vibration strength and vibration frequency was examined.As the result of the experiment, discharge voltage and space potential were found to be nearly constant in time and oscillatory phenomenon on 10〜30kHz band was observed mainly on the discharge current. In addition, both the experimental and numerical results indicated that this discharge oscillatory phenomenon originates from vibration of the ion beam current, vibration of the plasma production rate. Also, the plasma density oscillation at the similar frequency was indicated as a result of the vibration measurement of ion saturation current in the acceleration channel.The theoretical model was newly constructed by the assumption of a small disturbance which propagates on the basis of conservation formula of neutral particle density and plasma density in having a wave number at the starting point.From both the experimental and theoretical results, it was found that the oscillation phenomena in Hall thrusters are caused mainly by ionization instability occurred in the plasma acceleration channel.

为解决小型、轻量、高性能的空间火箭推进用霍尔电流型推力器存在的放电振动和电流振荡问题，设计并制作了1 kW级霍尔推力器，通过测量放电电压和电流，利用静电探针、离子收集器、频谱分析仪实验结果表明，放电电压和空间电位随时间变化基本恒定，放电电流主要在10 ~ 30 kHz频段出现振荡现象。此外，实验和数值计算结果表明，这种放电振荡现象源于离子束流的振荡，等离子体产生率的振荡。通过对加速通道中离子饱和电流的振动测量，发现了等离子体密度在相似频率下的振荡现象，并根据中性粒子密度和等离子体密度守恒公式，假设小扰动在起始点有一个波数传播，建立了新的理论模型，从实验和理论两个方面分析了等离子体密度振荡现象。结果表明，霍尔推力器中的振荡现象主要是由等离子体加速通道中的电离不稳定性引起的。