蒸气压对激光辐照靶材烧蚀速率的影响

姜学东; 陈纪然; 王彧; 王超

doi:10.11884/HPLPB201830.170271

蒸气压对激光辐照靶材烧蚀速率的影响

doi: 10.11884/HPLPB201830.170271

姜学东^1,,
陈纪然^1, ,,
王彧¹,
王超²

1.
北京交通大学电气工程学院, 北京 100044
2.
北京交通大学工程力学研究所, 北京 100044

基金项目:

国家自然科学基金项目 11472037

国家自然科学基金项目 1272042

中央高校基本科研业务费专项资金 2015JBM085

详细信息

作者简介:
姜学东(1970－), 男，硕士，从事开关电源以及等离子体方面研究；xdjiang@bjtu.edu.cn

通讯作者:
陈纪然(1993-), 女，硕士研究生，从事开关电源以及等离子体方面研究；15121395@bjtu.edu.cn

中图分类号: O536;O552.3
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- 被引次数: 0
出版历程
- 收稿日期: 2017-06-30
- 修回日期: 2017-09-26
- 刊出日期: 2018-02-15

Impact of vapor pressure on ablation rate of laser-irradiated ablate target

1.
School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China

摘要

摘要: 研究了强激光辐照碳/碳复合材料靶材引起的烧蚀现象及蒸气压对烧蚀速率的影响。基于傅里叶定律，建立了强激光辐照靶材的热传导模型，模拟了忽略蒸气压影响时烧蚀速率随功率的变化；通过Mott-smith近似方法描述了Knudsen层间断区域，分析了间断两侧表面粒子状态参数；结合质量连续方程和蒸气压与温度关系方程，并由气体状态方程描述蒸气流状态，对蒸气压条件下激光烧蚀碳/碳复合材料靶材的速率随功率变化的关系进行了数值模拟。结果表明，在高能激光对靶材的烧蚀过程中，蒸气压力变化会导致靶材的饱和蒸气温度发生变化，进而影响烧蚀速率且使其随功率呈非线性变化，与忽略蒸气压作用时的线性变化规律相差较大，从理论上解释了忽略蒸气压导致的实验数据与理论结果的差异。
- 激光 /
- 蒸气压 /
- 烧蚀速率 /
- Knudsen层
Abstract: The ablation phenomena induced by high energy laser irradiation of carbon/carbon composites and the effect of vapor pressure on the ablation rate are investigated.First, the heat conduction model of the target irradiated by high power laser is set up based on Fourier law. The discontinuous region of Knudsen layer is described and the state parameters of the particles on both sides of discontinuities are analyzed by the Mott-smith approximation method. Then, combined with the mass continuity equation and the relation equation between vapor pressure and temperature equations, and the gas state equation to describe the vapor flow state, the numerical simulation about the relationship of the laser ablation rate of C/C composite material under the condition of vapor pressure with the power change is carried out. The results show that vapor pressure change will lead to the change of target vapor temperature in the process of high energy laser ablation of target, which will affect the ablation rate and make the rate change with power nonlinearly. It is very different from the linear variation when ignoring the vapor pressure. And this theoretically explains the difference between experimental data and theoretical results caused by ignoring the vapor pressure.
- laser /
- vapor pressure /
- ablation rate /
- Knudsen layer

HTML全文

图 1 激光致等离子体示意图

Figure 1. Schematic diagram of laser induced plasma

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图 2 热传导模型示意图

Figure 2. Model of thermal conduction

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图 3 烧蚀速率随激光功率密度变化规律

Figure 3. Ablation velocity varies with along laser power density

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图 4 Knudsen层压力随激光功率密度的变化

Figure 4. Pressure of Knudsen layer vs laser power density

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图 5 表面温度随激光功率密度的变化

Figure 5. Surface temperature vs laser power density

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图 6 蒸气压对烧蚀速率的影响

Figure 6. Effect of vapor pressure on ablation velocity

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