战斗机3～5μm波段红外特征空间分布及低发射率材料隐身效果分析

Numerical Study on Spatial Distribution of 3～5 mm Infrared Signature and Stealth Effect of Low Emissivity Material for Fighter Aircraft

对典型战斗机在3～5μm波段范围内的红外辐射强度空间分布进行了数值计算,研究了红外搜索跟踪系统对目标的探测距离计算方法,考虑了大气透过率的影响,并分析了采用低发射率材料后战斗机的隐身效果。红外辐射特征的计算采用自开发软件NUAA-IR进行,探测距离的计算通过自编程完成,计算结果表明采用低发射率材料后战斗机在3～5μm波段机身正后向小角度范围内的红外辐射特征降低的量值比较大,3～5μm波段的红外搜索跟踪系统对战斗机正后向小角度范围内的探测距离明显减小。采用低发射率材料后,红外隐身效果提高了。

Taking a typical fighter aircraft as a model,the spatial distribution of infrared signature in 3～5 mm is calculated.The method of detection range is given and the stealth effect of low emissivity material of fighter aircraft is analyzed.The spatial distribution of infrared signature is calculated by the self-developed software NUAA-IR,and the detection range is calculated by the self-developed program.The result shows that in 3～5 mm,after the low emissivity material is used,the integral radiant intensity in the small-angle direction of the back fuselage is obviously reduced,and the detection range in the small-angle direction of the back fuselage is also obviously reduced.The radiant intensity in other direction is reduced a little.In a word,the stealth effect of low emissivity material is improved.