Synthetic jet을 이용한 스마트 무인기 익형 주위의 유동 제어 = Flow control of smart UAV airfoil using synthetic jet

In order to reduce the download around Smart UAV(SUAV) at hovering and transition mode, flow control using synthetic jet has been performed. Many of the complex tift rotor flow features are captured including wing leading and trailing edge separation, and the large region of separated flow beneath the wing. First, in order to control the trailing edge separation, synthetic jet is located at 30, 95% of flap chord length. The flow control using synthetic jet on flap shows that staff characteristics depending on several mode can be improved through separation vortices resizing. Also, a flap jet and a 0.01c jet which control the separation efficiently are applied at the same time at each test case because controlling the leading edge separation is essential for download reduction. As a result, time averaged download is reduced about 18% comparing with no control case at hovering mode and 48% at transition mode. These research results show that if flow control using leading edge jet and trailing edge jet is used effectively to the SUAV in overall flight mode, flight performance and stability can be improved.본 연구는 지식경제부 지원으로 수행하는 21세기 프론티어기술개발사업(스마트무인기기술개발) 및 방위사업청과 국방과학연구소의 지원(계약번호 UD070041AD)과 한국과학기술정보연구원 슈퍼컴퓨팅센터(KSC-2007-S00-1016), BK21 사업의 지원을 통해 수행되었음