Gurney flaps of different heights have been fitted to a generic double-element wing, and the effects at two typical flap angles have been observed using force and pressure measurements, and by performing flow surveys using Laser Doppler Anemometry. At a low flap setting angle of 20 deg the suction-surface flow remains attached to the trailing edge of the flap, and vortex flow features and perturbation velocities are all similar to those observed when Gurney flaps are fitted to single element wings. At a high flap deflection of 50 deg there is an extensive region of separated flow over the flap, yet the Gurney flap still alters the flow structure. The measurements suggest that the wake flow behind the Gurney flap consists of a von Karman vortex street of alternately shed vortices. The effects of the Gurney flap on the lift, zero-lift drag, and pressure distributions are reported, and the differences between the trends observed for single-element wings are discussed.
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March 2001
Technical Papers
Some Aspects of the Aerodynamics of Gurney Flaps on a Double-Element Wing
David Jeffrey, Penske Research Student,
David Jeffrey, Penske Research Student
School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
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Xin Zhang, Professor in Aerodynamics,
Xin Zhang, Professor in Aerodynamics
School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
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David W. Hurst, Senior Lecturer
David W. Hurst, Senior Lecturer
Department of Aerospace Engineering, Glasgow University, Glasgow, United Kingdom
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David Jeffrey, Penske Research Student
School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
Xin Zhang, Professor in Aerodynamics
School of Engineering Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
David W. Hurst, Senior Lecturer
Department of Aerospace Engineering, Glasgow University, Glasgow, United Kingdom
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division February 3, 2000; revised manuscript received August 28, 2000. Associate Editor: D. Williams.
J. Fluids Eng. Mar 2001, 123(1): 99-104 (6 pages)
Published Online: August 28, 2000
Article history
Received:
February 3, 2000
Revised:
August 28, 2000
Citation
Jeffrey, D., Zhang, X., and Hurst, D. W. (August 28, 2000). "Some Aspects of the Aerodynamics of Gurney Flaps on a Double-Element Wing ." ASME. J. Fluids Eng. March 2001; 123(1): 99–104. https://doi.org/10.1115/1.1334376
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