高频感应等离子体流动模型与微型电推进器流场特性分析

Fluid Model of High-Frequency Induction Plasma and Flow Field Characteristics of Micro Electric Thruster

微型射频离子推力器具有结构简单、工作寿命长、推力动态范围大、性能调节响应灵敏等特点,是国际微电推进领域的研究热点之一.射频离子推力器电离室内的感性耦合放电等离子体特性和推力器的性能密切相关.为此,文章建立了低气压、小尺寸微型射频离子推力器电离室内感性耦合等离子体流体模型,开展了电磁场、流场、化学反应浓度场的多物理场耦合仿真分析,并研究了等离子体放电特征参数随推进剂工质气压、放电吸收功率、射频频率以及线圈匝数等因素的变化规律.结果表明,推进剂工质气压、放电吸收功率是调节微型射频离子推力器性能的主要因素,该研究为综合调控微型射频离子推力器的工作性能奠定了良好的基础.

The micro radio frequency(RF)ion thruster is one of the international research hotspots in the field of micro-electric propulsion because of its simple structure,long lifetime,large thrust range and quick response.The performance of RF ion thruster is closely related to the characteristics of plasma in discharge chamber.To this end,a fluid model of inductively coupled plasma in micro RF ion thruster with low pressure and small size was established.A multi-physical coupling simulation involving electromagnetic field,flow field and chemical reaction concentration field was carried out.The variations of characteristic parameters of plasma with propellant pressure,absorption power,RF frequency and coil turns were studied.The results show that the propellant pressure and the absorption power are the main factors to regulate the performance of micro RF ion thruster.This study lays a good foundation for comprehensively regulating the performance of micro RF ion thruster.