强激光与粒子束, 2018, 30 (2): 021002, 网络出版: 2018-03-14  

蒸气压对激光辐照靶材烧蚀速率的影响

Impact of vapor pressure on ablation rate of laser-irradiated ablate target
作者单位
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
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。
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.

姜学东, 陈纪然, 王彧, 王超. 蒸气压对激光辐照靶材烧蚀速率的影响[J]. 强激光与粒子束, 2018, 30(2): 021002. Jiang Xuedong, Chen Jiran, Wang Yu, Wang Chao. Impact of vapor pressure on ablation rate of laser-irradiated ablate target[J]. High Power Laser and Particle Beams, 2018, 30(2): 021002.

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