Advanced

Near-field dynamics of a turbulent round jet with moderate swirl

Maciel, Y; Facciolo, L; Duwig, Christophe LU ; Fuchs, Laszlo LU and Alfredsson, P H (2008) In International Journal of Heat and Fluid Flow 29(3). p.675-686
Abstract
The near-field characteristics of a turbulent jet with moderate swirl generated by a fully developed, axially rotating pipe flow are investigated with LDV, time-resolved stereoscopic PIV measurements, as well as with large-eddy simulations. Large-scale vortical structures in either double, triple or even quadruple-helix configuration are found at the pipe exit but rapidly break down or amalgamate after two jet diameters. Further downstream, the swirling jet is dominated by large-scale sweeping motions not present at such a scale and strength in the non-swirling case. Of special interest is the recently discovered counter-rotating core (in the mean) which develops about six jet diameters downstream the jet exit. Data for all six Reynolds... (More)
The near-field characteristics of a turbulent jet with moderate swirl generated by a fully developed, axially rotating pipe flow are investigated with LDV, time-resolved stereoscopic PIV measurements, as well as with large-eddy simulations. Large-scale vortical structures in either double, triple or even quadruple-helix configuration are found at the pipe exit but rapidly break down or amalgamate after two jet diameters. Further downstream, the swirling jet is dominated by large-scale sweeping motions not present at such a scale and strength in the non-swirling case. Of special interest is the recently discovered counter-rotating core (in the mean) which develops about six jet diameters downstream the jet exit. Data for all six Reynolds stresses is reported at this position and it is argued that the counter-rotation is the result of the transport of angular momentum radially outward by the radial-azimuthal Reynolds shear stress. The mechanisms behind this transport are discussed by qualitative analysis of the time-resolved PIV and LES data and comparisons with the non-swirling case are made. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
LES, time-resolved PIV, stereoscopic PIV, LDV, swirling jet, turbulence
in
International Journal of Heat and Fluid Flow
volume
29
issue
3
pages
675 - 686
publisher
Elsevier
external identifiers
  • wos:000257133300011
  • scopus:43949122886
ISSN
0142-727X
DOI
10.1016/j.ijheatfluidflow.2008.02.003
language
English
LU publication?
yes
id
3e3378c4-be56-443c-9a7a-544ad3e4b024 (old id 1186905)
date added to LUP
2008-09-04 09:46:43
date last changed
2017-08-20 03:47:39
@article{3e3378c4-be56-443c-9a7a-544ad3e4b024,
  abstract     = {The near-field characteristics of a turbulent jet with moderate swirl generated by a fully developed, axially rotating pipe flow are investigated with LDV, time-resolved stereoscopic PIV measurements, as well as with large-eddy simulations. Large-scale vortical structures in either double, triple or even quadruple-helix configuration are found at the pipe exit but rapidly break down or amalgamate after two jet diameters. Further downstream, the swirling jet is dominated by large-scale sweeping motions not present at such a scale and strength in the non-swirling case. Of special interest is the recently discovered counter-rotating core (in the mean) which develops about six jet diameters downstream the jet exit. Data for all six Reynolds stresses is reported at this position and it is argued that the counter-rotation is the result of the transport of angular momentum radially outward by the radial-azimuthal Reynolds shear stress. The mechanisms behind this transport are discussed by qualitative analysis of the time-resolved PIV and LES data and comparisons with the non-swirling case are made.},
  author       = {Maciel, Y and Facciolo, L and Duwig, Christophe and Fuchs, Laszlo and Alfredsson, P H},
  issn         = {0142-727X},
  keyword      = {LES,time-resolved PIV,stereoscopic PIV,LDV,swirling jet,turbulence},
  language     = {eng},
  number       = {3},
  pages        = {675--686},
  publisher    = {Elsevier},
  series       = {International Journal of Heat and Fluid Flow},
  title        = {Near-field dynamics of a turbulent round jet with moderate swirl},
  url          = {http://dx.doi.org/10.1016/j.ijheatfluidflow.2008.02.003},
  volume       = {29},
  year         = {2008},
}