Parametric analysis of swept-wing geometry with sheared wing tipsA computational parameter study is presented of potential reductions in induced drag and increases in lateral-directional stability due to sheared wing tips attached to an untwisted wing of moderate sweep and aspect ratio. Sheared tips are swept and tapered wing-tip devices mounted in the plane of the wing. The induced-drag results are obtained using an inviscid, incompressible surface-panel method that models the nonlinear effects due to the deflected and rolled-up wake behind the lifting surface. The induced-drag results with planar sheared tips are compared to straight-tapered tip extensions and nonplanar winglet geometries. The lateral-directional static-stability characteristics of the wing with sheared tips are estimated using a quasi-vortex-lattice method. For certain combinations of sheared-tip sweep and taper, both the induced efficiency of the wing and the relevant static-stability derivatives are predicted to increase compared to the wing with a straight-tapered tip modification.
Document ID
19900062046
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Fremaux, C. M. (Lockheed Engineering and Sciences Co. Houston, TX, United States)
Vijgen, P. M. H. W. (High Technology Corp. Hampton, VA, United States)
Van Dam, C. P. (California, University Davis, United States)