Kumar, Manoj and Arakeri, JH and Shankar, PN (1994) A Note on Translational Velocity Oscillations of Piston Generated Vortex Rings. Technical Report. National Aerospace Laboratories, Bangalore, India.
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Abstract
Experimental results ar-e presented which chow that the13; translational velocities of pint on generated vortex rings often undergo oscillations, similar to those recently discovered for drop generated rings . An attempt has been made to minimize uncertainties by utilising both dye and - hydrogen bubbles for visualization and carefully repeating13; measurements on the same nominal piston conditions . The results unambiguously show that under most conditions, both for laminar and turbulent rings and for rings generated for pipes and orifices, the oscillations are present . The present results, together with the earlier results on drop generated rings, give support to the view13; that translational velocity oscillations are probably an13; inherent feature of translating vortex ring fields .
| Item Type: | Monograph (Technical Report) |
|---|---|
| Uncontrolled Keywords: | Vortex rings;Instability |
| Subjects: | ENGINEERING > Fluid Mechanics and Thermodynamics |
| Depositing User: | Mr. N A |
| Date Deposited: | 28 Jun 2006 |
| Last Modified: | 24 May 2010 04:12 |
| URI: | http://nal-ir.nal.res.in/id/eprint/1533 |
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