气流环境中激光烧蚀铝靶的数值模拟研究  

Numerical simulation on laser ablation of aluminum target under tangential airflow

作　　者：焦路光[1] 杨在富[1] 王嘉睿[1] 

机构地区：[1]军事医学科学院放射与辐射医学研究所,北京100850

出　　处：《激光与红外》2016年第2期145-149,共5页Laser & Infrared

摘　　要：建立了切向气流环境中连续激光烧蚀金属靶的二维轴对称物理模型,利用有限元软件ANSYS中的参数化设计语言APDL编制程序进行数值求解,使用"杀死"单元的方法实现靶目标边界退移的烧蚀和热传导耦合计算,从而对烧蚀尺寸的变化给出了定量描述。计算结果表明,相比于均匀分布,当激光呈高斯分布时,目标靶中心能够得到更高的温升,也就更容易发生烧蚀,靶的熔穿时间也就越短。本文建立的模型可以方便地推广至三维情形。A two-dimensional axial symmetry physical model is built for laser ablation of a metal target under tangential airflow. Based on the parametric design language of the finite element software ANSYS and using the method of killing elements,the temperature field distribution and the ablation of the target are calculated,and the ablation dimension is described quantitatively. The results show that when the energy distribution of the laser is Gaussian distribution,the temperature rise of the target center becomes higher,the ablation becomes easier,and the burn-through time becomes shorter. The two-dimensional model in this paper could extend to the three-dimensional situation.

关 键 词：激光与物质相互作用 温度场 烧蚀 切向气流 有限元模拟 

分 类 号：TN249[电子电信—物理电子学]