目标运动对激光辐照温度场的影响

摘要

Taking ground-based laser irradiating moving target as the background,the influence of parameter character-istics on temperature field irradiated by laser was analyzed.Firstly,the laser irradiating parameters were solved based on setting mutual scene.The parameter characteristics of laser irradiating moving target include the values of average power density changing with target moving.The spatial profile of laser beam on irradiating area is elliptic Gauss-func-tion.There is forced heat convection on the target surface.Then temperature field of moving target irradiated by laser was calculated by the finite volume method.Finally,the influence of parameter characteristics on temperature field ir-radiated by laser was analyzed.The results show that the values of average power density and the rate of temperature rising increase with target moving.The spatial profile of laser beam and area of laser irradiating are different because of the difference of angle between laser beam and target.There is forced heat convection on the surface of target which results in the decrease of the temperature rising rate.%以地基激光辐照运动目标为研究背景，分析运动目标辐照参数特性对激光辐照温度场的影响。首先，在设定交互场景的基础上，求解激光辐照参数，总结运动目标激光辐照参数的特点为：平均功率密度随目标运动不断变化；辐照面域光束强度空间分布为椭圆形高斯分布；目标表面存在强制热对流。其次，利用有限容积法求解激光辐照运动目标温度场分布。最后，分析运动目标辐照参数特性对温度场分布的影响。分析结果表明：随着目标的运动，激光辐照平均功率密度不断增加，目标温升速率不断增加；激光束辐照运动目标的角度不同，辐照面域的光束强度空间分布不同，温升区域也不相同；运动目标表面存在强制热对流形式的能量交换，减缓了表面温升。