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The effects of apex flap on the leading-edge vortex breakdown of a cropped double delta wing

Published online by Cambridge University Press:  04 July 2016

J. J. Wang ,
J. Y. Liu  and
Q. S. Li
J. J. Wang
Affiliation:
Fluid Mechanics Institute, Beijing University of Aeronautics and Astronautics, China
J. Y. Liu
Affiliation:
Fluid Mechanics Institute, Beijing University of Aeronautics and Astronautics, China
Q. S. Li
Affiliation:
Department of Building and Construction Engineering, City University of Hong Kong, China
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Abstract

The dye-injection flow visualisation technique was used to investigate the effect of the apex flap on the leading-edge vortex breakdown over a cropped 76°/40° double delta wing. The angle-of-attack of the experimental model varied from 20° to 40°, and the length of the apex flap was 25%c and 50%c respectively. By changing the angle of the apex flap, we found that the apex flap is an efficient method to control the leading-edge vortex breakdown, and that there exists an angle of the apex flap at which the value of the leading-edge vortex breakdown delay reaches maximum. Moreover, it is found that, for α < 28°, the small apex flap is a better choice for delaying the vortex breakdown; for α > 28°, the large apex flap is superior to the small one.

Type
Research Article
Information
The Aeronautical Journal , Volume 107 , Issue 1078 , December 2003 , pp. 739 - 742
Copyright
Copyright © Royal Aeronautical Society 2003 

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