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揭示束流随放电参数的变化规律是推力连续可调离子推力器研制工作的重要内容与理论基础。本文基于低温等离子体基本原理,结合Kaufman型离子推力器构型特点,面向束流调节技术,在充分考虑等离子体放电机制的基础上,从理论上建立描述束流与放电参数之间的函数关系的放电模型,清晰地阐述各放电参数对束流的影响;同时,开展针对性试验研究,用试验数据检验理论模型的正确性。结果表明:束流随放电电流变化较大且呈现线性特征;束流随磁场强度呈现非线性变化规律,且放电电流越大,非线性效应越明显;束流随工质流率变化呈现线性小幅变化。
It is an important content and theoretical basis to reveal that the beam variation with the discharge parameters is the development of thrust adjustable ion thruster. Based on the basic principle of low-temperature plasma and the configuration characteristics of Kaufman-type ion thrusters, this paper aims at the beam current regulation technology, and on the basis of fully considering the plasma discharge mechanism, establishes a theoretical description of the functional relationship between beam current and discharge parameters The discharge model clearly expounds the influence of each discharge parameter on the beam current. At the same time, we carry out targeted experiments and test the correctness of the theoretical model with the experimental data. The results show that the beam current changes linearly with the discharge current. The beam current shows a non-linear variation with the magnetic field strength. The larger the discharge current, the more obvious the nonlinear effect. The linearity of the beam current with the flow rate of the working fluid shows a small linearity Variety.