非平衡机制下激光与等离子体相互作用机理  

A Study on Laser and Plasma Interaction Effect Based on Non-equilibrium Mechanism

作　　者：鄢昌渝[1] 吴建军[1] 刘洪刚[1] 何振[1] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2008年第4期17-21,共5页Journal of National University of Defense Technology

基　　金：国家部委资助项目(61328);教育部"新世纪优秀人才支持计划"项目(NCET-06-0927)

摘　　要：采用三温度热化学非平衡模型,考虑了激光能量在空气等离子体中的共振吸收和逆韧致吸收机制,用有限差分NND格式对控制方程组进行数值离散。对等离子体点火过程进行耦合计算,并研究了不同入射激光强度条件下等离子体吸收波的形成和演化机制,讨论了粘性扩散效应对等离子体吸收波的影响。结果表明,在初始温度300K,大气压力条件下,生成ZND模式的LSD波所需最小激光强度为5.0×106W/cm2。The controlled equations based on thermo-chemical non-equilibrinm model under the condition of three temperatures were solved numerically by finite difference NND soheme. The inverse bremsstrahlung absorption and plasma resonance absorption were considered when laser transmitted in air plasma. Plasma initiation process was simulated in coupling computation. The mechanism of formation and development of plasma absorbing wave were investigated under different incident laser intensity, while viscidity and diffuseness effects were considered. The results show that the minimum laser intensity needed to form LSD wave based on ZND model is 5.0× 10^6 W/cm^2 at the initialized temperature 300K and the pressure is latin.

关 键 词：激光等离子体 LSD波 热化学非平衡 逆韧致吸收 

分 类 号：V439[航空宇航科学与技术—航空宇航推进理论与工程] TN249[电子电信—物理电子学]