Abstract: Experimental study on performance of laser-generated ablation propulsion is carried out with a set of system with which information of both flux-field and thrust loading can be gathered at the same time. Two phenomenons with obvious different characters are observed,which are water ablation and laser-induced air-breakdown with water as an induction. Developing speed is faster with water ablation than that with air-breakdown. Amplitude of thrust curve,impulse coupling coefficient and rate of energy conversion are about 10 times higher gained by water ablation compared with those obtained by air-breakdown. But special impulse of both phenomenons is close to the same value. The results are valuable for development of laser-induced ablation propulsion with water propellant.

Key words: Laser propulsion;Ablation;Breakdown;Propulsion performance

摘要： 利用所建流场信息与推力信号同步采集的实验系统,开展了水烧蚀激光推进性能实验研究。研究发现,实验中随机出现两种特征差别明显的现象,即水烧蚀和水诱导的空气击穿。对两种现象获得的气蚀空穴发展、推力特征、冲量耦合系数、比冲和能量利用率进行了分析。结果表明,与水诱导空气击穿相比,水烧蚀获得的气蚀空穴发展较快、推力幅值、冲量耦合系数和能量利用率都高约10倍,比冲比较接近。研究结果对于水烧蚀激光推进的发展有重要意义。

关键词: 激光推进;烧蚀;击穿;推进性能