Article

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

Experiments in Fluids (impact factor: 1.74). 05/2012; 51(6):1493-1507. DOI:10.1007/s00348-011-1156-5

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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Keywords

azimuthally
 
mean structure
 
paper presents
 
particular flow pattern
 
PIV experiments
 
previous planar
 
single realization
 
stereoscopic
 
Stereoscopic PIV
 
three-dimensional velocity
 
three-dimensional velocity field
 
turbulent stresses
 
velocity component information
 
vorticity information
 

L. Gan