NUMERICAL STUDY ABOUT AIRCRAFT-SKIN INFRARED CHARACTERISTICS AND ITS SUPPRESSION EFFECTIVENESS

다국어 초록 (Multilingual Abstract)

In supersonic cruise the temperature of aircraft skin arises higher than 300K due to aerodynamic heating. Then aircraft-skin infrared suppression of minimizing the radiation contrast of the aircraft skin from its background becomes a crucial survival technology. In the present study, a technique for the effectiveness evaluation of infrared suppression of aircraft skin is proposed. For this purpose, a synthetic model to simulate the overall numerical procedure has been developed. The thermal status on the aircraft skin was obtained by a computational fluid dynamics(CFD) method. Then, an infrared (IR) signature model for complex aircraft geometries was proposed with the reverse Monte Carlo(RMC) technique. The infrared contrast was adopted as the performance indicators for the evaluation of aircraft infrared suppression. The influence of aircraft skin radiation related factors, such as the aircraft-skin emissivity and the aircraft-skin temperature distribution, on the infrared contrast was also studied theoretically. The method has been applied to clarify the contribution of each aircraft components to the IR suppression of the overall infrared radiation. The results show that aircraft-skin temperature control and emissivity control are an effective approach to reduce the infranred radiation and to achieve lower detection. The results can be used as a practical guide line for designing future stealth aircrafts.