국내 최대 기계 및 로봇 연구정보

공학설계D/B

공학설계D/B 게시판 내용
Volume Title	Aerodynamics
Volume No	AEROFOILS AND WINGS - Wings - drag
DATA Title	Drag due to lift for non-planar swept wings up to high angles of attack at subsonic speeds.
DATA Item	96025
KEYWORD	camber, dependent, drag, edge, leading, lift, program, suction, twist, wing
ISBN	0 85679 989 0
ABSTRACT	ESDU 96025 introduces ESDUpac A9625 which provides a FORTRAN program, available on disc in the Software Volume, for the calculation of the lift and the drag due to lift for planar and non-planar wings with a turbulent boundary layer, alone or in combination with a body. The program is designed for use on PCs with the FORTRAN 5.1 compiler. The method, fully described in ESDU 96025, applies for angles of attack for which there is leading-edge vortex flow and partial or full loss of leading-edge suction but not widespread flow separation over the main part of the wing. The method of ESDU 95025 for planar wings has been extended to non-planar wings by using the theoretical distribution of the leading-edge suction for a planar wing of identical planform with a corrected local angle of attack deduced from a vortex lattice model. The method for calculating the attainable suction has been improved over that in ESDU 95025 and in calculating the vortex lift normal to the local surface allowance is made for the inboard migration of the leading-edge vortex. The resolved components of wing viscous axial force and of body axial and normal force are added to obtain total lift and drag due to lift. For the body contribution, the method of ESDU 90034 has been incorporated in the program with the assumption that the body can be approximated by an axisymmetric shape. The lift prediction is based on the leading-edge suction analogy and includes the non-linear contribution from leading-edge vortex flow together with the side-edge contribution. Sketches illustrate the quality of the prediction method when compared with experimental results extracted from the literature for wings with camber and twist in combination with bodies and the method predicts drag coefficient to within 0.01 of lift coefficient. The use of the program is fully described in ESDU 96025 and the input to and output from it illustrated by fully-worked examples.