空间碎片典型材料激光烧蚀反喷羽流实验研究

建立了观测和记录不同激光入射角度烧蚀6061铝合金靶材等离子体反喷羽流特性的实验装置,对实验结果图像进行了处理,并对处理结果进行了数值拟合。拟合结果表明,激光辐照靶材后100ns内,等离子体反喷羽流大致分布区域为靶面外5mm×5mm。激光以不同角度入射时,等离子体反喷速度相对于靶面法线方向大致呈轴对称分布。当激光相对靶面法线方向小角度范围内入射时,激光烧蚀引起的冲量主要沿靶面法线方向,反喷羽流沿靶面法方向的速度为20~40km·s-1。激光斜入射时,反喷羽流沿靶面法线方向的速度要大于激光垂直入射的情况。高斯函数可以很好地描述等离子体反喷羽流速度分布。

Laser ablation expansion plume performance experiments with typical material of orbital debris

Several plans for orbital debris elimination with lasers have been carried out in the international world in recent years. Orbital debris is non-cooperative target when effected with lasers. Laser beam would irradiate the orbital debris at a random incidence angle. The surface of debris would vaporize rapidly when irradiated by high power laser. Steam plasma of high temperature and pressure would spray at high speed. An experimental facility was set up to observe and record the plasma plume expansion of 6061 aluminum target at different laser incident angle. Images got in the experiment were disposed and the results were fitted with numerical method. The region of plasma expansion plume is 5 mm5 mm outside of the target surface. The velocity of the plasma plume expansion is roughly axisymmetrically distributed with different laser incidence angle. Laser ablation impulse is along the normal direction relative to the target surface when the laser irradiates within the small angle to the normal direction. The plasma plume expansion velocity is 20-40 kms-1 along the normal direction. The plasma plume expansion velocity is greater when the laser irradiate at oblique incidence. Gaussian function is a good way to describe plasma plume expansion velocity distribution.