高速气流作用下激光加热金属平板数值模拟  

Numerical simulation of metal plates under laser irradiation in high speed air

作　　者：张黎[1] 李牧[1] 谭福利[1] 张永强[1] 贺佳[1] 赵剑衡[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2015年第6期86-90,共5页High Power Laser and Particle Beams

基　　金：中国工程物理研究院流体物理研究所发展基金项目(SFZ20110401)

摘　　要：数值模拟研究了高速气流作用下激光加热金属平板温度场。流体控制方程为三维雷诺平均Navier-Stokes方程,固体控制方程为能量方程,湍流粘性系数求解使用k-ε两方程模型。采用流固耦合计算方法,使用两相流模型模拟气流对烧蚀物的剥蚀,较完整地模拟了激光辐照金属材料的物理变化过程,计算得到了不同气流速度下金属平板的温度分布以及烧蚀形貌。分别使用两相流方法和动网格方法对高速气流作用下激光对金属板的烧蚀效应进行了计算,结果表明,两相流方法与动网格方法都能较好地模拟高速气流作用下激光加热金属平板的温度响应,由于两相流方法能够较全面地模拟对流换热、熔化与凝固过程以及金属液体在气流冲刷下的动力学过程,因此能获得比动网格方法更为合理的物理图像。The thermal field of metal plates in air flows under laser irradiation was computed. The numerical simulation was based on fluid-solid coupling method. The two phase flow model was used to simulate the scouring effect. It employed an implicit finite-volume, Gauss-Seidel scheme for solving the Reynolds averaged Navier-Stokes equations and solid energy equation in a cou- pled manner. The k-e turbulence model was used for turbulence simulation. The physical process of laser ablation was described commendably with this method. The results of the thermal field and morphologies at different flow speed are presented in this pa- per. The results of two phase flow model and dynamic mesh model are compared and discussed. The results indicate that although the two models have the same thermal field results, the two phase flow model is more fit for physical process of laser ablation characterization.

关 键 词：流固耦合 冲刷效应 动网格 两相流 

分 类 号：TN246[电子电信—物理电子学]