Experimental Study of Aerodynamics and Wingtip Vortex of a Rectangular Wing in Flat Ground Effect
| Autor: | Tim Lee, Vincent Tremblay-Dionne, A. Lu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
020301 aerospace & aeronautics Wing Mechanical Engineering 02 engineering and technology Aerodynamics Mechanics 01 natural sciences 010305 fluids & plasmas Vortex Physics::Fluid Dynamics Ground effect (aerodynamics) 0203 mechanical engineering Inviscid flow Condensed Matter::Superconductivity 0103 physical sciences Wingtip vortices Wake turbulence Wind tunnel |
| Zdroj: | Journal of Fluids Engineering. 141 |
| ISSN: | 1528-901X 0098-2202 |
| DOI: | 10.1115/1.4043593 |
| Popis: | The ground effect on the aerodynamics and tip vortex flow of a rectangular wing is investigated experimentally at Re = 2.71 × 105. The results show that there is a large lift increase with reducing ground distance. By contrast, only a small drag increase is observed in ground effect except in close ground proximity for which a great drag increase appears. The tip vortex also moves further outboard and upward with reducing ground distance. Near the ground, there is the presence of a corotating ground vortex (produced by the rolling up of the boundary layer developed on the ground surface), leading to an increased vortex strength. In extreme ground proximity, a counterrotating secondary vortex (SV) (induced by the crossflow of the tip vortex), relative to the tip vortex, appears which causes a reduced vortex strength and a lowered lift-induced drag, as well as a vortex rebound. The impact of ground effect on the vortex flow properties is also discussed. The lift-induced drag, computed based on the crossflow measurements via the Maskell wake integral method, in ground effect is also compared against the inviscid-flow predictions and wind tunnel total drag force measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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