强激光与粒子束, 2013, 25 (4): 807, 网络出版: 2013-03-27
激光作用铝靶爆轰波流场观测与理论分析
Experimental observation and theoretical analysis of detonation wave evolution induced by laser ablating aluminum target
爆轰波 纹影照相法 点爆炸 流场演化 detonation wave schlieren photography technique point explosion flow field evolution
摘要
进行了强激光作用铝靶实验, 采用纹影照相法, 观察爆轰波流场演化过程, 分析了爆轰波衰减规律。根据冲击波运动的自相似性, 采用点爆炸模型描述了激光作用下爆轰波流场的演化, 计算了波阵面速度、压力和温度。结果显示: 爆轰波阵面沿迎着激光光源方向较快传播, 波阵面形状由最初的半椭球形逐渐向半球形转变, 在演化过程中扰动区结构复杂, 存在多个密度间断层。在爆轰波开始传播阶段, 波阵面的压力和温度较高但下降很快。
Abstract
A experiment of laser ablating aluminum target was conducted. A schlieren photography technique was employed for visualizing temporal evolution of detonation waves and analyzing detonation wave attenuation law. Based on similitude theory of shockwave motion, a point explosion model was used to describe detonation-wave evolution induced by laser ablating aluminum target. The propagation speed, pressure and temperature of the wave front were calculated. The results show that the detonation wave has a high speed towards laser source. The wave front transform from half-elliptical in early evolution stage into half-spherical. The disturbed zone has a complicated structure and multi-density discontinuities during the flow-field evolution. In the initial stage of detonation-wave propagation, the shockwave has a high pressure and temperature, but they decrease rapidly.
王飞, 陈朗, 伍俊英, 孙崔源. 激光作用铝靶爆轰波流场观测与理论分析[J]. 强激光与粒子束, 2013, 25(4): 807. Wang Fei, Chen Lang, Wu Junying, Sun Cuiyuan. Experimental observation and theoretical analysis of detonation wave evolution induced by laser ablating aluminum target[J]. High Power Laser and Particle Beams, 2013, 25(4): 807.