弹头壁面温度场建模及红外辐射特性研究

Modeling of missile wall temperature field and its infrared radiation characteristics

空间目标红外信号难以进行实测,主要依靠建模仿真得到.通过建立飞行于弹道中段目标的壁面温度场模型,以弹头及两种诱饵为仿真对象,考虑表面材料及内热源对弹头温度的影响,采用有限体积法求解壁面空间温度场分布,得到了全弹道内表面平均温度及辐射度变化规律.进一步分析目标对环境辐射的反射,计算了目标的辐射光谱分布.仿真分析表明,弹头及诱饵间表面温度分布、辐射度变化率、光谱分布均有很大差异,为红外探测识别提供了基本参数和理论依据.

Space target infrared signal is hard to measure actually, and obtained mainly by simulation. This paper establishes the wall temperature field model of target in midcourse, choosing warhead and two sorts of decoys as simulation objects, and obtains the surface average temperature and its changing law of radiation degree, by considering the impact of surface material and its internal heat source on the warhead and using the finite volume method to solve the distribution of wall temperature field. The distribution of target’s radiation spectrum is computed by further analyzing the target’s reflection on the environmental radiation. By simulation analysis it can be seen the diversity among the surface temperature distribution between the warhead and decoys, changing rate of the radiation degree, and the spectrum distribution, thus offering the basic parameters and theoretical basis for infrared detection and identification.