Swirl effects on external intermittency in turbulent jets
Swirl effects on external intermittency in turbulent jets
In this paper we present the modelled results of velocity and mixture fraction intermittency for selected isothermal swirling jet flows using large eddy simulation (LES). The modelled problems considered three different swirl numbers S=0.3, 0.54 and 0.8 respectively. The probability density functions (pdf) and intermittency of velocity and mixture fraction are presented. The simulations capture well complex flow features such as centre jet precession, a bluff body stabilised recirculation zone, and swirl induced vortex breakdown and also describe the effects of far field flow as well as scalar distributions. The calculated probability density distributions exhibit changes from a Gaussian to a delta function with increased radial distance from the jet centreline, and also a non-Gaussian shape on the jet centreline near the precession region. The radial variation of the intermittency shows differences between results with increased swirl number, especially inside the downstream swirl-induced recirculation region.
jet, bluff body, swirl, mixing, intermittency, les
193-206
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jenkins, K.W.
4ca70a5c-46dd-40bf-ae46-9efa3790f8ea
Savill, A.M.
f268afc4-a8e5-45cd-b5f1-afb459a24ef2
Kirkpatrick, M.P.
cf76adda-898f-472d-a93a-c55d29b06fba
February 2012
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jenkins, K.W.
4ca70a5c-46dd-40bf-ae46-9efa3790f8ea
Savill, A.M.
f268afc4-a8e5-45cd-b5f1-afb459a24ef2
Kirkpatrick, M.P.
cf76adda-898f-472d-a93a-c55d29b06fba
Ranga Dinesh, K.K.J., Jenkins, K.W., Savill, A.M. and Kirkpatrick, M.P.
(2012)
Swirl effects on external intermittency in turbulent jets.
International Journal of Heat and Fluid Flow, 33 (1), .
(doi:10.1016/j.ijheatfluidflow.2011.10.007).
Abstract
In this paper we present the modelled results of velocity and mixture fraction intermittency for selected isothermal swirling jet flows using large eddy simulation (LES). The modelled problems considered three different swirl numbers S=0.3, 0.54 and 0.8 respectively. The probability density functions (pdf) and intermittency of velocity and mixture fraction are presented. The simulations capture well complex flow features such as centre jet precession, a bluff body stabilised recirculation zone, and swirl induced vortex breakdown and also describe the effects of far field flow as well as scalar distributions. The calculated probability density distributions exhibit changes from a Gaussian to a delta function with increased radial distance from the jet centreline, and also a non-Gaussian shape on the jet centreline near the precession region. The radial variation of the intermittency shows differences between results with increased swirl number, especially inside the downstream swirl-induced recirculation region.
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HFF_2012.doc
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Published date: February 2012
Keywords:
jet, bluff body, swirl, mixing, intermittency, les
Organisations:
Engineering Science Unit
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Local EPrints ID: 347362
URI: http://eprints.soton.ac.uk/id/eprint/347362
ISSN: 0142-727X
PURE UUID: fdabb112-6df5-4d2b-b110-a94cafa55f4c
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Date deposited: 24 Jan 2013 16:50
Last modified: 15 Mar 2024 03:46
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Author:
K.W. Jenkins
Author:
A.M. Savill
Author:
M.P. Kirkpatrick
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