Off-surface aerodynamic measurements of a wing in ground effect
Off-surface aerodynamic measurements of a wing in ground effect
The off-surface aerodynamic characteristics of a wing in ground effect are investigated using a number of methods including laser Doppler anemometry and particle image velocimetry. The study focuses on two aspects of the flow: turbulent wake and edge vortex. These features are closely associated with the behavior of the aerodynamic force in ground effect. The size of the wake increases in proximity to the ground. A downward shift of the path of the wake is also observed. Discrete vortex shedding is seen to occur behind the wing. As the wing height is reduced, separation occurred on the suction surface of the wing, and the spanwise vortex shedding is found to couple with a flapping motion of the wake in the transverse direction. An edge vortex is also observed off the edge of the end plate of the wing, which contributes to force enhancement and helps to define the force behavior in the force enhancement region. The rate of change in the downforce vs height curve is linked to the strength of the edge vortex. The vortex breakdown signals a slowdown in the force enhancement. When the maximum downforce height is reached, the edge vortex breaks down completely.
716-725
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Zerihan, Jonathan
c71e1585-69bf-4085-8d62-8826452cfc7d
2003
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Zerihan, Jonathan
c71e1585-69bf-4085-8d62-8826452cfc7d
Zhang, Xin and Zerihan, Jonathan
(2003)
Off-surface aerodynamic measurements of a wing in ground effect.
Journal of Aircraft, 40 (4), .
Abstract
The off-surface aerodynamic characteristics of a wing in ground effect are investigated using a number of methods including laser Doppler anemometry and particle image velocimetry. The study focuses on two aspects of the flow: turbulent wake and edge vortex. These features are closely associated with the behavior of the aerodynamic force in ground effect. The size of the wake increases in proximity to the ground. A downward shift of the path of the wake is also observed. Discrete vortex shedding is seen to occur behind the wing. As the wing height is reduced, separation occurred on the suction surface of the wing, and the spanwise vortex shedding is found to couple with a flapping motion of the wake in the transverse direction. An edge vortex is also observed off the edge of the end plate of the wing, which contributes to force enhancement and helps to define the force behavior in the force enhancement region. The rate of change in the downforce vs height curve is linked to the strength of the edge vortex. The vortex breakdown signals a slowdown in the force enhancement. When the maximum downforce height is reached, the edge vortex breaks down completely.
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Published date: 2003
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Local EPrints ID: 22608
URI: http://eprints.soton.ac.uk/id/eprint/22608
ISSN: 0021-8669
PURE UUID: 81ca0723-7ef8-40af-97c2-d34d3626172a
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Date deposited: 13 Mar 2006
Last modified: 08 Jan 2022 18:53
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Author:
Xin Zhang
Author:
Jonathan Zerihan
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