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http://dx.doi.org/10.5139/JKSAS.2013.41.12.931

Study on the Aerodynamic Analysis for Wings with Various Shapes Using Lifting-line Methods  

Lee, Chang Ho (Aerodynamics Team, Korea Aerospace Research Institute)
Kang, Hyung Min (Aerodynamics Team, Korea Aerospace Research Institute)
Kim, Cheolwan (Aerodynamics Team, Korea Aerospace Research Institute)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.41, no.12, 2013 , pp. 931-939 More about this Journal
Abstract
In this paper, we try to find the lifting-line method which is applicable to the conceptual design of aircraft wings, and analyze the accuracy and coverage of the method. Two methods that are extended from the lifting-line theory of Prandtl are selected. One of the methods is Weissinger's method which imposes the velocity boundary condition at the control points located at the quarter chord, and the other is Phillips's method which combines the three-dimensional vortex lifting law. Calculations are performed for an elliptic wing, a swept back wing, and a tapered unswept wing with dihedral angle and geometric twist. The aerodynamic data of the potential flow such as spanwise distributions of circulation and downwash, lift and induced drag are obtained through calculations, and these data are compared with theoretical results and wind tunnel test data. As a result, Weissinger's method showed good accuracy and reliability regardless of wing shapes, but Phillips's method revealed inaccurate results for a swept back wing.
Keywords
Potential Flow; Lifting-line Theory; Lift; Induced Drag; Downwash; Circulation; Horseshoe Vortex;
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