大气层外弹道式目标表面温度场的有限元分析

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.

Finite element analysis of the surface temperature distribution on exoatmospheric ballistic target

Obtaining the surface temperature field of the target is an important prerequisite for studying the target's infrared characteristics. According to the axisymmetric distribution of the temperature field of the exoatmospheric ballistic target, a two-dimensional finite element model of transient heat transfer was developed in the cylindrical coordinate system. The natural boundary conditions in the model involved solar radiation, earth radiation, earth albedo radiation and space radiation. The temperature fields of a kind of exoatmospheric ballistic target were calculated by ANSYS. The numerical results show that the temperature differences on the target's surface in the daytime and nighttime are about 34K and 14K respectively during the flight period. The model used here is very valuable for the infrared detection, stealth and imaging simulation of the exoatmospheric ballistic target.