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An experimental study of a turbulent vortex ring

Glezer, Ari and Coles, Donald (1990) An experimental study of a turbulent vortex ring. Journal of Fluid Mechanics, 211 . pp. 243-283. ISSN 0022-1120. doi:10.1017/S0022112090001562.

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A turbulent vortex ring having a relatively thin core is formed in water by a momentary jet discharge from an orifice in a submerged plate. The necessary impulse is provided by a pressurized reservoir and is controlled by a fast programmable solenoid valve. The main aim of the research is to verify the similarity properties of the mean flow, as defined by ensemble averaging, and to find the distribution of mean vorticity, turbulent energy, and other quantities in the appropriate non-steady similarity coordinates. The velocity field of the vortex is measured for numerous realizations with the aid of a two-channel tracking laser-Doppler velocimeter. The problem of dispersion in the trajectories of the individual rings is overcome by development of a signature-recognition technique in two variables. It is found that the turbulence intensity is largest near the vortex core and that at least the radial component is not negligible in the near wake. The slow growth of the ring structure is controlled by a slight excess of entrainment over de-entrainment. An important inference is that the growth process and the process of turbulence production probably involve secondary vortices wrapped around the core in azimuthal planes.

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URLURL TypeDescription DOIUNSPECIFIED ItemCaltech PhD Thesis
Additional Information:© 1990 Cambridge University Press. Received 18 July 1987 and in revised form 12 July 1989. Published online: 26 April 2006. The assistance of Dr Thomas Roesgen in making the various contour plots is deeply appreciated. The research described in this paper was supported in part by the National Science Foundation under Grants ENG 75-03694 and ENG 77-23541.
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NSFENG 75-03694
NSFENG 77-23541
Record Number:CaltechAUTHORS:20130509-134004695
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38393
Deposited By: Tony Diaz
Deposited On:10 May 2013 22:40
Last Modified:09 Nov 2021 23:37

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