激光水推进技术的实验研究

激光水推进技术是一种新概念的推进技术,其原理是以水作为推进工质,通过强激光辐照后水的爆炸、反喷进行驱动,具有很高的冲量耦合系数Cm。本文介绍了以硬铝LY12、黄铜、45号钢和石墨作为基板,通过改变基板表面蓄水槽的深度(0mm,3mm,5mm)进行了较系统的激光水推进实验,研究了不同材质基板和不同水槽深度对推进效能的影响,结果表明,蓄水槽深度为3mm的铝基板的Cm最高,达到了350dyne/w,比直接烧蚀提高了2个量级。通过分析实验数据还初步总结出:推进过程中,基板喷射产物颗粒越细,水推进的Cm就越大;对于金属基板,Cm随板材原子量的增加而减小。

The Experimental Investigation of Laser-driven Water Vehicle

Laser propulsion is new conceptual propulsion,when laser ablated a target covered with water,it will generate much higher coupling coefficient Cm than it is ablated directly.In this article,the materials Al,Cu,Fe and C are used as the target plates,and every plate has three water channel depth(0mm,3mm and 5mm) respectively.The Al plate with 3mm water channel depth achieved the highest value of Cm(350dyne/W).After experimental investigations,some conclusions have been drawn and analyzed.The Cm value of target plate under rocket mode measured by laser impulse pendulum is 100 times less than the result with water layer.It seems that the value of Cm will decrease with the increase of atomic mass for the metal target,and the Cm value also has some relations with the size of ejection particles for target plate under rocket mode,the smaller ejection particles can generate higher value of Cm.