地球静止轨道LIPS-300离子电推力器热设计与优化

Thermal design and optimization of LIPS-300 ion thruster in geosynchronous orbit

LIPS-300离子电推力器工作时产生的大量热耗会严重影响其工作性能,因此推力器的热控设计和在轨温度预计是推力器设计的关键技术之一。文章首先提出了地球静止轨道LIPS-300离子电推力器热设计,建立了离子电推力器热分析有限元模型。然后,针对典型的地球静止轨道位保工况开展了LIPS-300离子电推力器的在轨热分析,得到了LIPS-300离子电推力器重点部件在轨工作时的温度预计:下极靴、阳极筒、屏栅、下磁钢为主要的高温位置,且下磁钢温度可能超出材料温度上限。最后,基于热分析的结果结合离子电推力器的特点提出适当增加外壳散热面积是离子电推力器优化设计的有效方向,而增强阳极筒、极靴与屏栅筒间的内部换热是无效的设计优化方向。

The Large heat dissipation of LIPS-300 ion thruster seriously affects its performance.Therefore,the thermal design and analysis of LIPS-300 ion thruster in geosynchronous orbit were carried out.The simulation results show that under the hightemperature working condition,the downstream harness,downstream and upstream anode,screen grid,and downstream magnet are the positions with the highest temperature,and the temperature of the downstream magnet exceeds the temperature upper limit.In order to decrease the temperature of the downstream magnet,two optimization design measures were presented and tried.The analysis results indicate that increasing heat radiation area is an effective optimization design measure while enhancing the inner heat exchange is noneffective.