为了研究气流条件下强激光对金属靶的熔蚀效应,采用有限体积方法建立了数值模型,并开发了三维Fortran计算程序.综合考虑强激光与材料耦合规律、光束能量空间分布、材料高温热物理性能以及熔蚀界面移动等关键影响因素,模拟了激光辐照下金属靶板升温、熔化和剥蚀的复杂物理过程.最后,将计算结果与试验数据进行了比较,验证了计算模型和程序的有效性.结果表明,计算模型能够反映强激光熔蚀金属平板的基本规律,熔蚀深度和后表面温度计算值与试验吻合较好,并且自编计算程序简单高效.

In order to investigate the melt removal effects of the metal plate under laser irradiation,a three-dimensional thermal model based on finite volume method(FVM) was constructed.The model employs a database of material properties,such as the heat capacity,the thermal conductivity,and the absorptivity.An important feature of these properties is their temperature dependence.As molten metal would be carried out of the surface by the airflow,the boundary condition control volumes and iterative algorithm were modified and the finite volume equation could be solved in irregular domain.Also a three dimensional program code was developed with Fortran language.It was found that the program can perform a high-accuracy simulation of airflow-induced melt removal effects of metal plate under laser irradiation.