The infrared integral radiant intensity of a typical fighter within the waveband between 8μm and 14μm and its detection range detected by infrared search/tracking system was calculated by taking into account the influence of the atmospheric transmissivity. The infrared stealth effect of the fighter with use of low emissivity materials was also analyzed. The flow field was calculated by Flunt software

while the infrared radiation characteristics and detection range were simulated by using self-developed software NUAA-IRSE. The results show that the infrared integral radiant intensity increases with the increasing of circumference angle and pitch angle. When applying low emissivity materials

the infrared integral radiant intensity decreases in all directions

leading to an improved infrared stealth effect.