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获取目标表面温度场是进行红外特征分析的重要前提。根据大气层外弹道式目标温度场的轴对称分布特点,在柱坐标系内建立了二维瞬态热传递的有限元模型。模型中的自然边界条件包括太阳辐射、地球辐射、地球反照辐射和空间辐射。最后应用ANSYS软件计算了一种大气层外弹道式目标的表面温度场分布,数值计算表明:在目标飞行全程中,其表面温度在白天和夜晚分别约为34K和14K。该模型对于大气层外弹道式目标的红外探测、隐身和成像仿真具有重要价值。
Obtaining the target surface temperature field is an important prerequisite for the infrared character analysis. According to the axisymmetric distribution of the ballistic target temperature field outside the atmosphere, a two-dimensional transient heat transfer finite element model is established in the cylindrical coordinate system. The natural boundary conditions in the model include solar radiation, earth radiation, earth’s albedo and space radiation. Finally, ANSYS software was used to calculate the surface temperature field distribution of an atmospheric outer-ballistic target. The numerical results show that the surface temperature of the target is about 34K and 14K at daytime and at night, respectively. The model is of great value for the infrared detection, stealth and imaging simulation of the ballistic target outside the atmosphere.