摘要
采用Gurney理论,建立了激光作用复合膜体驱动飞片的理论计算模型。通过修正膜体材料的激光能量吸收系数,对激光作用复合膜体结构形成的飞片速度进行计算,分析了膜体材料和结构组成对飞片速度的影响,确定了形成高速飞片的复合膜体结构。进行了强激光作用复合膜体驱动飞片实验,采用压电薄膜测量了飞片到达不同距离的时间,计算得到飞片的速度和加速度。结果表明:不同激光能量作用下复合膜体飞片的加速特征基本相似,激光能量的变化对飞片加速时间的影响较小,飞片速度随着光爆层厚度的增加呈先增大后减小的趋势;对应于不同的激光能量,光爆层存在最优能量吸收厚度。
A calculation model of laser-driven multi-layer flyer velocity was established based on Gur- hey theory. By modifying laser energy absorption coefficient, the velocity of the multi-layer flyer driven by laser pulse beam was calculated. The effects of layer materials and layer configuration on the flyer velocity were analyzed. The multi-layer film configuration which was capable of forming high velocity flyer was decided. An intense laser driven multi-layer flyer experiment was conducted, in which piezoe- lectric film sensors were employed to measure the flight time of flyer traveling different distances. The velocity and acceleration of flyer were obtained. The results show that the acceleration characteristics of multi-layer flyer driven by different laser energies are similar. Laser energy has little influence on acceleration time. The flyer velocity increases at first and then decreases with the increase of ablation depth. Ablation layer has an optimal depth for energy absorption at different energies.
出处
《高压物理学报》
CAS
CSCD
北大核心
2014年第4期489-497,共9页
Chinese Journal of High Pressure Physics
基金
爆炸科学与技术国家重点实验室自主研究课题(QNKT14-01)
关键词
激光驱动
复合膜体
飞片
laser-driven
multi-layer film
flyer
