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 |
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| 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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