국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Numerical and experimental study of drag characteristics of two-dimensional HLFC airfoils in high subsonic,high Reynolds number flow
저자	Yoji ISHIDA, Masayoshi NOGUCHI, Mamoru SATO, Hiroshi KANDA
Keyword	Hybrid Laminar Flow Control; Airfoil; Subsonic flow; High Reynolds number flow
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr1244t.pdf?id=NALTR0001244T
보고서번호	NAL TR-1244T
발행년도	1994.7
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	Hybrid laminar flow control(HLFC) is one of the most promising aircraft drag reduction technologies.However,very few experimental and theoretical studies have been reported.We have investigated both numerically and experimantally the aerodynamic characteristics of an HLFC airfoil and wing at high subsonic,High Reynolds number conditions.In this paper,we report the results of the wind tunnel test on drag characteristics,with and without suction,of two-dimensional HLFC airfoils with porous and slot suction approach under some adverse factors ageinst laminar flow,and a numerical analysis of the wind tunnel data,which is based on the boundary layer calculation with a new transition prediction method allowed for the adverse factors and the Squire-young drag formula.The HLFC models achieved total drag reduction of as high as 20％ at realistic flight condition and the numerical method has given satisfactory predictions.