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Experiments in Fluids
Published in: Experiments in Fluids 6/2011

01-12-2011 | Research Article

An experimental study of a turbulent vortex ring: a three-dimensional representation

Authors: L. Gan, T. B. Nickels, J. R. Dawson

Published in: Experiments in Fluids | Issue 6/2011

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Abstract

This paper presents a reconstruction of the three-dimensional velocity field of a turbulent vortex ring by means of Taylor’s hypothesis. Stereoscopic PIV is used to acquire three velocity component information on a plane. The accuracy of the Taylor’s hypothesis for this particular flow pattern is first discussed, and the three-dimensional velocity and vorticity information are then presented. This study also introduces an azimuthally averaging method in order to give a mean structure in cylindrical coordinates from a single realization and from which turbulent stresses and production can be estimated. The azimuthally averaged quantities are then compared with the ensemble-averaged results from the previous planar (two-dimensional and stereoscopic) PIV experiments.
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Footnotes
1
Ideally the instantaneous convection velocity of the ring would be used. This requires simultaneous measurements normal to the measurement plane which were not available.
 
2
It is assumed here that the ring advection velocity in the vicinity of the PIV testing location is constant. Figure 3 shows that it is a fairly reasonable assumption.
 
3
If one produces a large number of turbulent vortex rings from a circular orifice, and does an ensemble average, the resultant velocity field is approximately axisymmetric.
 
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Metadata
Title
An experimental study of a turbulent vortex ring: a three-dimensional representation
Authors
L. Gan
T. B. Nickels
J. R. Dawson
Publication date
01-12-2011
Publisher
Springer-Verlag
Published in
Experiments in Fluids / Issue 6/2011
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-011-1156-5

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