强激光水下爆炸推进的物理机制

吴先前; 王一伟; 黄晨光

doi:10.6052/0459-1879-14-253

强激光水下爆炸推进的物理机制

中国科学院力学研究所, 流固耦合系统力学重点实验室, 北京100190

基金项目: 国家自然科学基金资助项目(11402277, 11332011, 11202215).

详细信息

通讯作者:
黄晨光, 研究员, 主要研究方向: 冲击动力学、激光与物质的相互作用以及结构动力学. E-mail: huangcg@imech.ac.cn

中图分类号: O38
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出版历程
- 收稿日期: 2014-08-28
- 修回日期: 2014-12-30
- 刊出日期: 2015-07-17

PHYSICS OF LASER PROPULSION UNDERWATER: EXPERIMENTS AND MODELING

Key Laboratory of Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Funds: The project was supported by the National Natural Science Foundation of China (11402277, 11332011, 11202215).

摘要

摘要: 对激光水下聚焦爆炸推进的作用机理开展了实验测量和数值模拟研究. 实验观察到激光水下聚焦爆炸推进分为两个物理过程: (1) 强激光与铝膜相互作用诱导等离子体演化, 产生短脉冲、高幅值的等离子体压力, 并对航行体做功; (2) 激光爆炸产物气泡脉动, 对航行体继续提供推力. 另外, 实验还对不同介质中的激光推进效率以及气泡与约束壁面/自由水面相互作用的物理机制进行了研究. 发现在高阻抗环境介质、气泡受约束脉动以及近自由水面条件下, 激光爆炸推进的效率更高. 在实验的基础上, 建立了激光水下聚焦爆炸推进的物理模型, 发展了相应的耦合数值计算方法. 计算得到的气泡脉动规律及航行体运动规律与实验测量结果一致, 验证了计算的模型和方法, 为强激光水下聚焦爆炸推进机理的研究提供了一种有效的方法.
- 激光水下聚焦爆炸推进 /
- 激光诱导等离子体 /
- 气泡脉动 /
- 物理模型 /
- 数值模拟
Abstract: In the present research, physics of laser propulsion underwater was investigated by experiments and numerical simulation. Two physical processes of laser propulsion were observed in experiments. One is laser-matter interaction during laser irradiating propelled object, in which the laser induced plasma with short duration and high amplitude was generated. The object was propelled under the pressure of plasma. Another is bubble pulsation after the annihilation of plasma, resulting in the movement of object under bubble pressure with relative long duration. In addition, high speed of object was also observed for high impedance medium around the object and for propulsion near free surface of water. Based on the experiments, a physical model as well as simulation method were developed, by which the characteristics of laser propulsion underwater, including applied pressure and resistance histories, laser induced bubble pulsation, etc. were obtained. The simulated results agreed well with experiments, providing a valuable insight into the physics of laser propulsion underwater.
- laser propulsion /
- laser induced plasma /
- bubble pulsation /
- physical model /
- numerical simulation

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