대기환경을 고려한 항공기 배기플룸의 IR 신호해석에 관한 연구

Technologies associated with aircraft survivability and susceptibility are of considerable importance in modern warfare. In order to enhance the aircraft survivability, it is necessary to reduce the IR signature level of the hot plumes exhausted from an aircraft and analyze the IR signature detected in heat seeking or IR homing missiles or IR seeker on the ground. In this work, numerical method is adopted to attack the thermal flowfield and IR signature level of the exhaust plume from a subsonic aircraft. Also, atmospheric transmissivities with different air mass, visibility range, season, and observation angle are investigated by using the LOWTRAN 7. Finally, the IR signature level, which is emitted from the hot plume exhausted from subsonic aircraft, is analyzed according to flight altitude and observation angles from the view of IR seeker on the ground. It can be found that the Blue and Red spikes are appeared due to the atmospheric effects caused by CO₂ and H₂O. Also, it was confirmed that the IR signature level is reduced as the aircraft altitude was high and the observation angles on the ground increased.