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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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.
|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|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||06 Mar 2006|
|Last Modified:||26 Dec 2012 08:47|
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