꼬리날개가 없는 BWB 형태의 무인전투기에 대한 기본 공력 실험을 수행하였으며, 본 연구는 국방과학연구소의 중형 아음속 풍동에서 수행되었다. 실험 형상은 UCAV 1303 기반의 lambda wing configuration이다. 실험 데이터는 6분력 내장 저울을 통해 획득하였으며, 레이놀즈 수 효과의 데이터 또한 확인하였다. 실험 풍속은 20 m/s에서 70 m/s까지 10 m/s 간격으로 수행되었으며, 받음각 범위는 -3°~25°이다. 풍속 증가에 따른 양력 계수, 항력 계수 그리고 피칭 모멘트 계수의 변화를 확인하였으며, 풍속 증가에 따라 최대 양력 계수의 증가와 항력 계수의 감소를 확인하였다. 또한 특정 받음각에서 피칭 모멘트가 급격하게 변화하는 pitch-up (or pitch break)현상을 확인하였다.
The basic aerodynamic experiment about the tailless BWB UCAV configuration was conducted. This study was carried out at the low speed wind tunnel of the Agency for Defense Development(ADD-LSWT). The test model base is the lambda wing configuration of the UCAV 1303. The test data were acquired with the 6 component internal balance. The data of the Reynolds number effect were also identified. The range of the test wind speed is 20 m/s ~ 70 m/s and the tests were conducted with internals of 10 m/s. And the range of the angle of attack is -3°~25°. According to the wind speed increase, the changes of the lift coefficient, drag coefficient and pitching moment coefficient were identified in this study. And maximum lift coefficient was increased by the Reynolds number increase, drag coefficient was decreased by the Reynolds number increase. The pitch-up (or pitch break) phenomenon was also identified at the specific angle of attack.