环聚焦推进器聚焦点位置对激光推进性能的影响

针对进气口开放的环聚焦推进器,通过改变聚焦点的位置,数值模拟研究了推进器的推力、冲量耦合系数以及推进器整流罩承受的热冲击等问题。模拟结论表明聚焦点位置变化对激光推进性能有较大的影响,当聚焦点远离整流罩时,推进器获得推力的时间提前,冲量耦合系数增大,并且整流罩承受的热冲击降低。同时,模拟还表明在推进器构型设计中应该加大整流罩倾斜段的长度和倾斜角度,以限制逆流而上的冲击波冲出进气口,给推进器带来额外的阻力。

Influence of focus on propulsion performances of the ring focusing thruster

Aiming at open-inlet mode ring focusing thruster,issues including thrust,impulse coupling coefficient and thermal damage on the cowl are numerical simulating investigated by altering the focus location.The results indicate that the performance of thruster deeply depends on the focus location.When the focus is located far from the cowl,the thrust occurs earlier,the impulse coupling coefficient is larger and the thermal damage risk of the cowl is lower than those of laser focusing on the cowl.In addition,in o...