烧蚀模式激光推进的数值模拟  

Simulation of ablation mode laser propulsion

作　　者：童慧峰[1] 唐志平[1] 张凌[1] 

机构地区：[1]中国科学技术大学力学和机械工程系中科院材料力学行为与设计重点实验室

出　　处：《爆炸与冲击》2007年第2期165-170,共6页Explosion and Shock Waves

摘　　要：采用针对高温气体(等离子体)电离度的一种近似计算方法,以及具有五阶精度的广义Godunov差分格式-加权本质无振荡格式WENO(weighted essentially non-oscillatory schemes),给出了高温气体状态方程的简便描述,并考虑激光与等离子体的相互作用,模拟了强激光与固体靶相互作用时激光支持靶面等离子体流场的动态物理过程,并给出了不同参数条件下激光烧蚀固体靶的推进效应参数(冲量耦合系数等)。计算结果及与实验结果的对比表明,靶材料和激光参数(功率密度、波长、脉冲宽度等)是影响推进效应的主要因素,并且计算结果具有较高的精确度。A general Godunov finite difference schemes-WENO schemes which had fifth-order accuracy was used to make a numerical calculation for 2-dimensional axis symmetrical laser-supported plasma flow field under laser ablated solid target and laser ablated propulsion efficiency parameters（mechanical coupling coefficient etc. ） was obtained by the simulation. The models of the calculation of ionization degree of plasma and the interaction between laser beam and plasma and the simplified cos（equation of state） of plasma were considered in the simulation. Comparision of simulation and calculation results shows that the different materials of target and the laser parameters （intensity, wave length etc. ） and the geometry of target are the main factors which influence the laser propulsion efficiency.

关 键 词：固体力学 推进效应 激光支持等离子体流场 激光烧蚀推进 

分 类 号：O346[理学—固体力学] O532.25[理学—力学]