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Vortex–leading-edge interaction

Published online by Cambridge University Press:  20 April 2006

Samir Ziada  and
Donald Rockwell
Samir Ziada
Affiliation:
Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pa. 18015, U.S.A. Present address: Lab. for vibrations and acoustics, Sulzer Bros, Winterthur, Switzerland.
Donald Rockwell
Affiliation:
Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, Pa. 18015, U.S.A.
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Abstract

Visualization of successive vortices impinging upon the leading edge of a wedge reveals patterns of deformation of each incident vortex; for certain offsets of the edge with respect to the incident vortex there is pronounced vortex shedding from the leading edge, whereby the shed vortex has a vorticity orientation opposite to that of the incident vortex.

Simultaneous consideration of this visualization interaction and the force induced on the wedge gives the relation between the nature of the interaction mechanism and the relative magnitude and phase of the force exerted on the wedge. The amplitude of the induced force is found to be a strong function of the transverse offset of the leading edge with respect to the incident vortex and the degree of vorticity shedding from the leading edge. Application of Stuart's vortex model to the incident vortices provides a means for approximating the phase and relative amplitude of the induced force as a function of the transverse offset of the leading edge.

Information

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 118 , May 1982 , pp. 79 - 107
Copyright
© 1982 Cambridge University Press

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