Visualization and PIV study of wing-tip vortices for three different tip configurations |
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Authors: | Myong Hwan Sohn Jo Won Chang |
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Institution: | 1. Defence Science & Technology Group, Victoria 3207, Australia;2. Australian Maritime College, University of Tasmania, Tasmania 7248, Australia;3. School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, United Kingdom |
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Abstract: | The planform, profile, and cross-sectional views of the wing-tip region of a half-wing model with an aspect ratio of 3.2 and three different wing configurations, namely, square-cut, simple fairing, and Whitcomb?s full winglet wing-tip, were visualized at various angles of attack using smoke-wire visualization technique. Visualization pictures clearly show that the wing-tip vortices at different angles of attack and wing-tip configurations had distinct formation and structure characteristics. A comparison of simple fairing and Whitcomb?s winglet configurations shows that the wing-tip vortices of the Whitcomb?s winglet configuration were reduced in strength and displaced outboard and upward, at least in the near-wake region. This resulted in an increased lift-to-drag ratio for the Whitcomb?s winglet configuration. The changes in the wing-tip vortex characteristics and the improved aerodynamic performance of the winglet were confirmed by Particle Image Velocimetry (PIV) measurements of the cross-flow velocity of the wing-tip trailing regions and the force measurement of the model. |
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