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Delay of vortex ring pinchoff by an imposed bulk counterflow

Dabiri, John O. and Gharib, Morteza (2004) Delay of vortex ring pinchoff by an imposed bulk counterflow. Physics of Fluids, 16 (4). L28-L30. ISSN 1070-6631. http://resolver.caltech.edu/CaltechAUTHORS:DABpof04

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Abstract

The Kelvin–Benjamin variational principle has been previously used to predict that vortex ring pinchoff can be delayed if the energy of the leading vortex ring is decreased during formation and/or the energy delivered by the vortex generator is increased. We present experimental results in which the former and latter energy effects were simultaneously accomplished by imposing a bulk axisymmetric counterflow during vortex ring formation. Measurements indicate that the formation number is retarded sufficiently to allow increased ingestion of fluid circulation by the leading vortex ring. This serves as a first demonstration of artificial manipulation of vortex ring formation for potential propulsive benefits in starting jets.


Item Type:Article
Additional Information:©2004 American Institute of Physics. (Received 23 October 2003; accepted 21 January 2004; published online 8 March 2004) This research is supported under National Science Foundation Grant No. 0309671.
Subject Keywords:vortices; variational techniques; jets; flow simulation
Record Number:CaltechAUTHORS:DABpof04
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:DABpof04
Alternative URL:http://dx.doi.org/10.1063/1.1669353
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2068
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:06 Mar 2006
Last Modified:26 Dec 2012 08:47

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