末敏弹减速减旋段表面温度与辐射特性

Surface temperature and radiation characteristics of terminal-sensitive projectile at deceleration and despinning stage

为了掌握末敏弹从母弹舱内抛出后表面的动态红外辐射特性,根据其结构特征、结合减速减旋段的动力学模型,建立了末敏弹在气动加热、内部热源及与环境热交换的综合作用下,表面温度场与辐射特性的物理模型。耦合求解弹道模型与热平衡方程组,得到了动态温度场与辐射亮度的分布规律,最后计算并分析了不同初始条件、不同光谱波段内的辐射强度随飞行时间的变化规律。研究结果可以为红外探测识别末敏弹提供参考。

For mastering the dynamic infrared radiation characteristics on the surface of terminal-sensitive projectile when it was projected from cabin of the carrier shell,according to the structure characteristics, combining with the dynamic model of the deceleration and despinning stage,the physical model of temperature field and radiation characteristics were established under the comprehensive effect of aerodynamic heating,internal heat source and the heat exchange with environment.Based on the coupled solution of thermal balance equations and trajectory model,the distribution law of surface temperature field and radiance were obtained.Finally,the infrared radiation intensity of different spectral bands varying with flying time were calculated and analyzed in different initial conditions.The results provide valuable reference for the infrared detection and recognition of terminal-sensitive projectile.