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Vortex ring pinchoff in the presence of simultaneously initiated uniform background co-flow

Krueger, Paul S. and Dabiri, John O. and Gharib, Morteza (2003) Vortex ring pinchoff in the presence of simultaneously initiated uniform background co-flow. Physics of Fluids, 15 (7). L49-L52. ISSN 1070-6631. http://resolver.caltech.edu/CaltechAUTHORS:KRUpof03b

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Abstract

Vortex rings were formed with a piston-cylinder mechanism in the presence of uniform background co-flow supplied through a shroud surrounding the cylinder. The jet and co-flow were started simultaneously. Ratios of the co-flow to jet velocity (Rv) in the range 0–1 were considered. The formation number (F) as a function of Rv was determined using the procedure of Gharib et al. [J. Fluid Mech. 360, 121 (1998)] and a generalized definition of formation time. The results show a sharp decrease in F as Rv increases from 0.5–0.75, suggesting possible performance limitations for pulsed-jet propulsion.


Item Type:Article
Additional Information:©2003 American Institute of Physics. (Received 16 January 2003; accepted 25 April 2003; published online 6 June 2003)
Subject Keywords:vortices; jets; external flows; laser velocimetry; flow visualisation
Record Number:CaltechAUTHORS:KRUpof03b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KRUpof03b
Alternative URL:http://dx.doi.org/10.1063/1.1584436
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2064
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:06 Mar 2006
Last Modified:26 Dec 2012 08:47

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