飞行器目标的尾焰红外辐射特性对目标的红外探测、识别和跟踪具有极其重要的作用。为了分析尾焰的红外辐射特性, 首先根据经验公式计算出尾焰的流场分布, 然后使用窄带模型计算出谱带的光谱吸收系数和透过率; 对于非均匀热气体, 考虑到碰撞展宽效应和多普勒展宽效应, 使用C-G谱带传输模型得到飞行器尾焰2~5 m的红外辐射分布。最后, 计算了不同组分的尾焰红外辐射特性, 分析了组分分布和大气传输对尾焰红外辐射特性的影响, 为探测波段的选择提供了参考依据。

The infrared radiation characteristics of a high-speed vehicle plume are of great importance to the infrared detection, identification and tracking of a target. To analyze the infrared radiation characteristics of the plume, the flow field of the plume is first partitioned according to the empirical formula. Then, the spectral absorption coefficient and transmittance in the band are calculated by using a narrowband model. For the non-uniform hot gas, in view of the Collided-broaden effects and the Doppler-broaden effects, the infrared radiation intensity of a high-speed aircraft plume in the wave band from 2 to 5 m is computed by using a C-G band transmission model. Finally, the infrared radiation characteristics of a plume containing different components are calculated and the influence of composition distribution on the infrared radiation characteristics of the plume is analyzed. At the same time, the influence of atmospheric transmission on the infrared radiation characteristics of the plume is analyzed. This study is of referential value to the selection of detection bands.