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Vortex growth in jets

Published online by Cambridge University Press:  29 March 2006

Gordon S. Beavers  and
Theodore A. Wilson
Gordon S. Beavers
Affiliation:
Department of Aerospace Engineering and Mechanics, University of Minnesota
Theodore A. Wilson
Affiliation:
Department of Aerospace Engineering and Mechanics, University of Minnesota
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Abstract

Observations are reported on the growth of vortices in the vortex sheets bounding the jet emerging from a sharp-edged two-dimensional slit and from a sharp-edged circular orifice. A regular periodic flow is observed near the orifice for both configurations when the Reynolds number of the jet lies between about 500 and 3000. The two-dimensional jet produces a symmetric pattern of vortex pairs with a Strouhal number of 0·43. Vortex rings are formed in the circular jet with a Strouhal number of 0·63. Computer experiments show that a growing pair of vortices in two parallel vortex sheets produces a symmetric pattern of vortices upstream from the original disturbance.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 44 , Issue 1 , 21 October 1970 , pp. 97 - 112
Copyright
© 1970 Cambridge University Press

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