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Influence of bluff-body and swirl on mixing and intermittency of jets

Influence of bluff-body and swirl on mixing and intermittency of jets
Influence of bluff-body and swirl on mixing and intermittency of jets
In this paper we present the modelled results of turbulence, scalar mixing and intermittency for three different basic fluid dynamical problems using large eddy simulation (LES). The modelled problems are a turbulent round jet, a bluff body stabilised jet, and a bluff body stabilised swirl jet in a co-flow environment. Both instantaneous and time averaged results along with the probability density functions (pdf) and intermittency of velocity and passive scalar are presented. Simulations well captured the flow features of jet, bluff body stabilised jet and bluff body stabilised swirl jet. The instantaneous and time averaged data show the differences in turbulence and mixing and also an improvement of mixing in the presence of a bluff body and swirl. The addition of bluff body and swirl affect the structure of pdfs for both velocity and passive scalar at different axial and radial locations. The radial variation of intermittency at locations close to the centreline indicates turbulent to non-turbulent phenomena respect to bluff body and swirl at both upstream and downstream recirculation regions.
jet, bluff body, swirl mixing, intermittency, les
374-386
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.
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. (2010) Influence of bluff-body and swirl on mixing and intermittency of jets. Engineering Applications of Computational Fluid Mechanics, 4 (3), 374-386.

Record type: Article

Abstract

In this paper we present the modelled results of turbulence, scalar mixing and intermittency for three different basic fluid dynamical problems using large eddy simulation (LES). The modelled problems are a turbulent round jet, a bluff body stabilised jet, and a bluff body stabilised swirl jet in a co-flow environment. Both instantaneous and time averaged results along with the probability density functions (pdf) and intermittency of velocity and passive scalar are presented. Simulations well captured the flow features of jet, bluff body stabilised jet and bluff body stabilised swirl jet. The instantaneous and time averaged data show the differences in turbulence and mixing and also an improvement of mixing in the presence of a bluff body and swirl. The addition of bluff body and swirl affect the structure of pdfs for both velocity and passive scalar at different axial and radial locations. The radial variation of intermittency at locations close to the centreline indicates turbulent to non-turbulent phenomena respect to bluff body and swirl at both upstream and downstream recirculation regions.

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More information

Published date: September 2010
Keywords: jet, bluff body, swirl mixing, intermittency, les
Organisations: Engineering Science Unit

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Local EPrints ID: 347354
URI: http://eprints.soton.ac.uk/id/eprint/347354
PURE UUID: ebba4de9-bb20-4062-aaf2-5927feb1fd19
ORCID for K.K.J. Ranga Dinesh: ORCID iD orcid.org/0000-0001-9176-6834

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Date deposited: 28 Jan 2013 10:17
Last modified: 15 Mar 2024 03:46

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Contributors

Author: K.W. Jenkins
Author: A.M. Savill
Author: M.P. Kirkpatrick

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