An analytic and experimental effort was undertaken to assess the effectiveness and efficiency of three winglets mounted chordwise to the tip of a rectangular wing. The winglets, with an aspect ratio of 4.6, were mounted on a half-span wing having an effective aspect ratio of 6.29. 13 configurations of varying dihedral arrangements were analyzed with a vortex lattice method and tested in a low-speed wind tunnel at a Reynolds number of 600,000. While the analytic method provided fair agreement with the experimental results, the predicted trends in lift, drag, and (to a lesser degree) pitching moment were in good agreement. The analytic distributions of wake velocity, circulation, and downwash angle verified that highly nonplanar configurations tended to reduce and diffuse the regions of highest circulation and to create more moderate downwash angles in the wake. This was manifest as an overall drag reduction. More specifically, the results showed that the winglets could be placed in various optimum orientations to increase the lift coefficient as much as 65% at the same angle of attack, decrease the drag coefficient as much as 54% at the same lift coefficient, or improve the maximum by up to 57%. The most dramatic findings from this study show that positioning the winglet dihedral angles had the result of adjusting the magnitude and slope of the pitching moment coefficient. These observations suggest that multiple winglet dihedral variations may be feasible for use as actively controlled surfaces to improve the performance of aircraft at various flight conditions and to “tune” the longitudinal stability characteristics of the configuration.
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July 2008
Research Papers
Analytic and Experimental Investigation of Dihedral Configurations of Three-Winglet Planforms
David S. Miklosovic, MS
David S. Miklosovic, MS
Assistant Professor
Mem. AIAA
Aerospace Engineering Department,
United States Naval Academy
, 590 Holloway Road, MS 11-B, Annapolis, MD 21402-5042
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David S. Miklosovic, MS
Assistant Professor
Mem. AIAA
Aerospace Engineering Department,
United States Naval Academy
, 590 Holloway Road, MS 11-B, Annapolis, MD 21402-5042J. Fluids Eng. Jul 2008, 130(7): 071103 (10 pages)
Published Online: July 2, 2008
Article history
Received:
September 12, 2007
Revised:
March 16, 2008
Published:
July 2, 2008
Citation
Miklosovic, D. S. (July 2, 2008). "Analytic and Experimental Investigation of Dihedral Configurations of Three-Winglet Planforms." ASME. J. Fluids Eng. July 2008; 130(7): 071103. https://doi.org/10.1115/1.2948372
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