| 引用本文: | 鄢昌渝,吴建军,刘洪刚,等.非平衡机制下激光与等离子体相互作用机理.[J].国防科技大学学报,2008,30(4):17-21.[点击复制] |
| YAN Changyu,WU Jianjun,LIU Honggang,et al.A Study on Laser and Plasma Interaction Effect Based on Non-equilibrium Mechanism[J].Journal of National University of Defense Technology,2008,30(4):17-21[点击复制] |
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| 非平衡机制下激光与等离子体相互作用机理 |
| 鄢昌渝, 吴建军, 刘洪刚, 何振 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 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5.0×106 W/cm2。 |
| 关键词: 激光等离子体 LSD波 热化学非平衡 逆韧致吸收 |
| DOI： |
| 投稿日期：2007-11-20 |
| 基金项目: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) |
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| A Study on Laser and Plasma Interaction Effect Based on Non-equilibrium Mechanism |
| YAN Changyu, WU Jianjun, LIU Honggang, HE Zhen |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073，China)
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| Abstract: |
| The controlled equations based on thermo-chemical non-equilibrium model under the condition of three temperatures were solved numerically by finite difference NND scheme. 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 5.0×106 W/cm2 at the initialized temperature 300K and the pressure is 1atm. |
| Keywords: laser plasma LSD wave thermo-chemical nonequilibrium inverse bremsstrahlung absorption |
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