A Note on Translational Velocity Oscillations of Piston Generated Vortex Rings

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: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Vortex rings;Instability
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    Division/Department: Computational and Theoretical Fluid Dynamics Division, Other, Computational and Theoretical Fluid Dynamics Division
    Depositing User: Mr. N A
    Date Deposited: 28 Jun 2006
    Last Modified: 24 May 2010 09:42
    URI: http://nal-ir.nal.res.in/id/eprint/1533

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