Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287300
Title: An investigation into the aerodynamics of Gurney flaps
Author: Jeffrey, David Robert Michael
ISNI:       0000 0001 3589 7872
Awarding Body: University of Southampton
Current Institution: University of Southampton
Date of Award: 1998
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Abstract:
The Gurney flap is a simple device for increasing the normal force (lift or downforce) generated by a wing. This thesis presents results from different experimental and computational techniques, which are used to examine the aerodynamics of the Gurney flap. Time-averaged off-surface velocities, obtained using Laser Doppler Anemometry, confirm the hypothesis that the dominant features directly downstream of the Gurney flap are two counter-rotating vortices. The instantaneous flow structure actually consists of a wake of alternatively shed vortices, which form a von Karman vortex street. The vortex shedding and the deceleration of the flow caused by the upstream face of the Gurney flap centre a pressure difference acting across the trailing edge, and it is this that generates the increase in circulation. Arguments are put forward that explain the observed variations in shedding frequency, trailing-edge pressures and suctions, lift and drag in Gurney flap height, incidence and sectional properties. The effect of the Gurney flap on chordwise pressures can be simulated in a three-dimensional panel method by extending the trailing edge of the aerofoil.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.287300  DOI: Not available
Keywords: Aerofoils; Lift; Drag
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