巡航导弹排气系统红外辐射数值模拟

巡航导弹排气系统的红外辐射严重影响其红外隐身突防能力。首先建立导弹发动机排气系统计算模型,对其巡航状态下的流场进行了计算；其次,基于逆向蒙特卡洛法编写的红外辐射特性计算程序模拟了导弹排气系统空间探测点的红外辐射特性；最后分析了空间红外成像及光谱辐射强度分布情况。结果表明：巡航导弹红外辐射具有从正前向到正后向气体辐射向固体辐射逐渐过渡的特点,正后向45°锥形空间辐射较强；模拟红外辐射对指导改进导弹隐身突防能力具有较强的军事应用价值。

Numerical simulation of infrared radiation for cruise missile exhaust system

Infrared radiation of exhaust system seriously affects the defense penetration ability of infrared stealthy cruise missile.Firstly,the calculation model of the cruise missile exhaust system was established,and the flow filed was calculated under the cruising state.Secondly,based on reverse Monte Carlo method,one program to calculate infrared radiation characteristics was written,and then based on the program,infrared radiation characteristics of the detecting points around the exhaust system were calculated.Finally,the infrared imaging and the distribution of spectral radiation intensity were analyzed.The results show that the infrared radiation of the missile presents transitional characteristic from gas radiation at the front detecting point to solid radiation at the end detecting point and the infrared radiation intensity in 45 degree cone space is strong,the simulation of infrared radiation has an important military value for improving defense penetration ability of infrared stealthy missile.