水滴烧蚀多脉冲激光推进性能

用实时的推力测试方法研究了水滴烧蚀模式多脉冲TEA CO2激光推进的推进性能。用纹影法研究了伴随水滴烧蚀产生的激波等流场变化过程。多脉冲激光推进的比冲和冲量耦合系数等性能参数随激光脉冲重复频率的变小和脉冲数目的增加而逐渐下降。与激光传输相反和相同方向的激波传播最大速度分别为10 km/s和7 km/s。与纹影法结果同步获得的推力曲线表明：汽化过程对推力的形成过程贡献最大，激波也对推力的形成过程有一定贡献。

Abstract

Time-resolved force sensing technique was applied to the study on propulsive characteristics of water droplets for multi-pulse TEA (transversely excited at atmospheric pressure) CO2 laser propulsion. Laser-driven blast waves and associated flow dynamics in impulse generation processes of ablation of water droplets were studied through schlieren visualization. Experimental results show that coupling coefficient and specific impulse decrease as the interval between laser pulses and pulse numbers increase. The maximum speed of blast wave in the opposite and same direction of laser propagation is 10 km/s and 7 km/s, respectively. Time-resolved force and schlieren visualization results indicate that vaporization and blast waves dominate the impulse generation processes of water droplets for laser propulsion.

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李修乾, 洪延姬, 文明, 叶继飞, 崔村燕, 陈正. 水滴烧蚀多脉冲激光推进性能[J]. 强激光与粒子束, 2011, 23(7): 1731. Li Xiuqian, Hong Yanji, Wen Ming, Ye Jifei, Cui Cunyan, Chen Zheng. Propulsive characteristics of water droplets for multi-pulse laser propulsion[J]. High Power Laser and Particle Beams, 2011, 23(7): 1731.

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