建立了气流作用下激光辐照金属的数值模型,利用CFD软件模拟了不同气流速度、不同厚度金属锡板的激光辐照熔化烧蚀过程,并对比了实验结果。通过研究液态金属迁移机理及对流散热机理,分析了气流速度对不同厚度金属板的辐照效应的影响。研究结果表明,较厚金属板的辐照过程中会形成较深的熔坑,使得相同气流速度下熔化的液态金属较难移除,导致熔穿时间随气流速度增大而减小;较薄金属板的熔坑较浅,液态金属容易移除,由于移除的金属液滴混合在空气中增强了对流换热效果,因此熔穿时间随气流速度增大而增大。 The numerical model of laser irradiated metal under air flow was established. The laser ablation process of metal tin plates with different air velocity and thickness was simulated by CFD software, and the experimental results were contrasted. By studying the mechanism of liquid metal migration and the mechanism of convection and heat dissipation, the influence of air velocity on the irradiation effect of metal plates with different thicknesses was analyzed. The results show that the thicker metal plate will form deeper craters during the irradiation process, which makes it difficult to remove the molten liquid metal at the same gas velocity, resulting in the decrease of penetration time with the increase of gas flow rate. The metal plate has a shallow melting pit and liquid metal can be easily removed. As the metal droplets are removed and mixed in the air to enhance the convective heat transfer effect, the melting time increases with the increase of the air flow velocity.