环境压力对胶体推力器喷雾过程的影响

Effect of Ambient Pressure on Droplet's Spray Process in Colloid Thruster

对应用于卫星微推进胶体推力器的喷雾过程进行模拟研究,采用拉格朗日粒子跟踪法计算带电液滴的运动轨迹,获得抽取极板前后液滴速度和密度的空间分布.分析推力器工作环境压力对喷雾扩散角、液滴轴向速度和推力器性能的影响.模拟结果表明:随着推力器工作环境压力的降低,液滴轴向速度增大,喷雾扩散角变化较小,推力器性能提高.当工作环境压力低于一定值时,其对喷雾过程的影响可以忽略,而推力器性能基本保持不变.

Modeling study of droplet＇ s in colloid thruster is conducted in this paper. Motion of droplets is investigated by using the Lagrange tracking method. Velocity distribution and spatial distribution of droplets are obtained. The effect of ambient pressure on spray angle, axial velocity distribution of droplets and performance of the thruster are analyzed. It is shown that the axial velocity of droplets and performance of the thruster increase and spray angle is less influenced with the decrease of the ambient pressure. While ambient pressure is less than the threshold pressure, the effect of ambient pressure on the spray process, velocity distribution of droplets and performance of the thruster can be ignored.