Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Investigation of the Effects of UAV Nozzle Configurations on Aircraft Lock-on Range

무인항공기의 노즐 형상 변화가 Lock-on Range에 미치는 영향에 관한 연구

  • Kim, Min-Jun (Department of Aerospace and System Engineering and ReCAPT, Gyeongsang National University) ;
  • Kang, Dong-Woo (Department of Aerospace and System Engineering and ReCAPT, Gyeongsang National University) ;
  • Myong, Rho-Shin (Department of Aerospace and System Engineering and ReCAPT, Gyeongsang National University) ;
  • Kim, Won-Cheol (Agency for Defense Development)
  • Received : 2014.08.06
  • Accepted : 2015.01.23
  • Published : 2015.03.01
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Abstract

The infrared lock-on range of target aircraft plays a critical role in determining the aircraft survivability. In this investigation, the effects of various UAV engine nozzle configurations on the aircraft lock-on range were theoretically analyzed. A virtual subsonic aircraft was proposed first, based on the mission requirement and the engine performance analysis, and convergent-type nozzles were then designed. After determining thermal flow field and nozzle surface temperature distribution with the CFD code, an additional analysis was conducted to predict the IR signature. Also, atmospheric transmissivity for various latitude and seasons was calculated, using the LOWTRAN code. Finally, the lock-on and lethal envelopes were calculated for different nozzle configurations, assuming the sensor threshold of the given IR guided missile. It was shown that the maximum 55.3% reduction in lock-on range is possible for deformed nozzles with the high aspect ratio.

표적 대상 항공기의 적외선 lock-on range는 항공기의 생존성을 결정하는데 있어 중요한 요소이다. 본 연구에서는 무인항공기의 엔진 노즐 형상이 lock-on range에 미치는 영향에 관한 이론적 연구를 수행하였다. 이를 위해 가상 아음속 항공기의 임무 요구조건과 엔진 성능분석을 통한 형상 변형노즐을 고려하였다. 먼저 열유동장과 노즐 표면 온도분포를 해석한 다음, 적외선 신호 해석을 수행하였다. 또한 대기전파 모델인 LOWTRAN 코드를 이용하여 고도와 계절변화에 따른 대기투과율을 계산하였다. IR 유도 미사일의 센서 특성값을 가정하여 여러 노즐형상에 대한 lock-on 및 lethal envelope 계산을 수행하였다. 높은 세장비를 갖는 변형노즐의 경우 최대 55.3%의 lock-on range 감소가 가능한 것으로 나타났다.

Keywords

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