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为计算末敏子弹在弹道诸点的瞬态红外辐射,根据末敏子弹外壁气动加热、辐射换热和内部导热耦合作用机理,利用流体仿真软件Fluent对完整弹道下末敏子弹的非稳态温度分布进行数值计算。在此基础上,计算分析了子弹弹体和降落伞在3~5μm和8~12μm波段的红外辐射特性及在弹道中的变化规律,并与对应探测视线方向的天空背景红外辐射特性进行对比。计算结果表明:降落伞辐射亮度有时为子弹弹体辐射亮度的一半,但辐射强度可达到子弹弹体辐射强度的21倍,在长波红外波段、弹道减速减旋阶段实现对末敏子弹的告警具有较强的可行性。
In order to calculate the transient infrared radiation of the terminal bullets at ballistic points, according to the mechanism of aerodynamic heating, radiation heat transfer and internal thermal conductivity coupling of the extremity-sensitive bullets, the unsteady temperature Distribution for numerical calculation. On this basis, the infrared radiation characteristics of the projectile body and the parachute in 3 ~ 5μm and 8 ~ 12μm band are calculated and analyzed in the trajectory, and compared with the infrared radiation characteristics of the sky background corresponding to the detection sight direction. The calculation results show that the radiance of the parachute is sometimes half that of the projectile, but the radiation intensity can reach 21 times the radiation intensity of the projectile. In the long-wave infrared band, Strong feasibility.