为降低导光镜镜面热变形, 采用有限体积法求解三维湍流传热方程, 获得了镜面激光辐照区的温度场。文中主要讨论了激光功率、辐照时间、冷却液流速、镜体材料、流道与镜面距离等因素对镜面温度场的影响, 并以辐照区平均温度和标准温度偏差作为主要指标进行冷却效果评价。结果表明, 激光功率越大, 各个方向上的温度越大; 激光辐照发生的初始阶段温升增加较快, 后期趋于平缓; 流速越大, 平均温度越低, 标准温度偏差越小; 镜体材料的性质对温度场也有不同影响; 流道与镜面距离对铜镜的温度场影响不大。

In order to reduce the thermal deformation of the light guide mirror, the finite volume method was employed to solve the three-dimensional turbulent heat transfer equation and the temperature field of the laser irradiated region was obtained. In this thesis, the effects of laser power, irradiation time, coolant velocity, mirror materials, the distance between channel and mirror on the temperature field were discussed. The average temperature and the standard deviation of temperature of irradiation zone were regarded as the main indexes to evaluate the cooling effect. It is found that the greater the laser power is, the greater the temperature in various directions is. The temperature rise is faster in the initial stage of laser irradiation and it tends to be gradual in the latter. The larger the coolant velocity is, the lower the average temperature and the standard deviation of temperature are. Different properties of the mirror materials also have influence on the heat transfer effect, but the distance between channel and mirror has little effect on the temperature field of the copper mirror.