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建立了激光打孔过程的固/液/气三相三维数值计算模型,采用水平集(level-set)方法处理能量输入边界并追踪气液(L/V)界面发展,从而对激光打孔过程中的孔壁变化进行描述.模型综合考虑了材料气化、熔融液体溅射两种效应,涉及熔化潜热、气化潜热吸收及辐射散热损失等因素.基于有限体积法,编制计算程序,对激光打孔过程中的温度场、孔型演化过程进行了数值模拟,探讨了不同激光参数对打孔过程的影响.该模型对认识和研究激光打孔行为具有参考价值,也可以扩展至其他高能束流在材料表面的打孔描述.
A solid / liquid / gas three-phase three-dimensional numerical model for laser drilling was set up. The level-set method was used to process the energy input boundary and trace the development of gas-liquid interface. The laser drilling process The pore wall changes are described in the paper.The model considers two effects of material gasification and molten liquid sputtering, including the latent heat of fusion, the absorption of latent heat of vaporization and the heat loss of radiation.According to the finite volume method, The influence of different laser parameters on the drilling process was discussed by numerical simulation of the temperature field and pore evolution during drilling.The model can be used to recognize and study the laser drilling behavior and can be extended to other high energy beam Flow on the surface of the material described in the hole.