靶结构对烧蚀模式激光推进效应影响的数值模拟

童慧峰; 唐志平

doi:10.11858/gywlxb.2011.03.006

靶结构对烧蚀模式激光推进效应影响的数值模拟

doi: 10.11858/gywlxb.2011.03.006

童慧峰^1,2,,
唐志平²

1.
中国工程物理研究院流体物理研究所，四川绵阳 621900；
2.
中国科学技术大学力学和机械工程系，中国科学院材料力学行为与设计重点实验室，安徽合肥 230026

详细信息

通讯作者:
童慧峰

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出版历程
- 收稿日期: 2010-03-16
- 修回日期: 2010-09-03
- 发布日期: 2011-06-15

Simulation of Ablation Mode Laser Propulsion Efficiency of Confined Target Geometry

TONG Hui-Feng^{1,2
,},
TANG Zhi-Ping²

1.
Institute of Fluid Physics, CAEP, Mianyang 621900, China;
2.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, Department of Mechanics and Mechanical Engineering, University of Science and Technology of China, Hefei 230026, China

More Information

Corresponding author: TONG Hui-Feng

摘要

摘要: 强激光辐照于固体平面靶产生高温、高压等离子体喷射，进而对固体靶产生力学推进效应，这是烧蚀模式激光推进的基本原理。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），对强激光烧蚀固体靶产生等离子体喷射推进效应进行数值模拟。计算了固体靶面横向尺寸与激光光斑大小对推进效应影响的耦合关系，以及不同靶面结构烧蚀压力随时间的变化及其推进效应参数变化。数值模拟结果表明，靶面横向尺寸与光斑大小具有最优耦合值；固体靶面增加约束喷管结构对激光推进效应明显增大，并且随着约束喷管位置的不同，对激光推进效应增大的影响也有较大差异。
- 激光烧蚀推进 /
- 推进效应 /
- 数值模拟
Abstract: Under the irradiation of high power laser, the surface matter of solid target can be vaporized and ionized instantly. The ejected high temperature and high pressure plume generates propulsion force, this is the fundamental of ablated laser propulsion. A general Godunov finite difference WENO (Weighted Essentially Non-Oscillatory) schemes which have fifth-order accuracy is used to conduct a numerical calculation for laser ablated solid target and its ablated propulsion efficiency. Simulation results show that the propulsion efficiency is dependent to varied degrees on the coupling of target cross direction radius with the laser spot size; the confined geometry of the target surface strengthens the propulsion efficiency dramatically.
- ablated laser propulsion /
- propulsion efficiency /
- numerical simulation

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