摘要
采用CO2激光器和固体推进剂对三种构形的抛物型激光推力器模型进行了烧蚀模式下的单脉冲、多脉冲连续推进的对比实验,单脉冲实验获得的最高冲量耦合系数达到2.7×10-4N/W,对多脉冲连续推进时的冲量耦合系数有较大幅度的下降进行了分析,尝试采用PVDF薄膜传感器,测量了推力器内壁的瞬态压强,并采用热像仪对推力器的外壁温升进行了连续记录,为进一步研究激光能量转化为推力的机理以及热力冲击的影响提供了直接的数据。
With a high power TEA-CO2pulsed laser （20 J/pulse, 66 - 150 Hz） , both single-and multi-pulse propulsion experiments are conducted for three kinds of parabolic thrusters with 3 solid propellants POM, PMMA and PVC, respectively. The single pulse experiments give the maximum momentum coupling coefficient Cm 2. 7 × 10^-4 N/W （thruster A with POM）. The C for multi pulse experiments is much lower than the single pulse case. The PVDF stress gauges and infrared camera are used to measure the pressure and temperature distribution and evolution on the wall of the thrusters. The maximum temperature increase for 49 pulses and peak pressure measured are 110 ℃ and 2.3 MPa, respectively. It suggests the therrnomechanical impact effect should be taken into account in the laser thruster study.
出处
《推进技术》
EI
CAS
CSCD
北大核心
2008年第3期371-376,共6页
Journal of Propulsion Technology
关键词
激光推进
烧蚀模式
CO2激光器
冲量耦合系数
抛物型推力器
Laser propulsion
Ablation mode
TEA-CO2pulsed laser
Momentum coupling coefficient
Parabolic thruster
