The University of Southampton
University of Southampton Institutional Repository

LES of recirculation and vortex breakdown in swirling flames

LES of recirculation and vortex breakdown in swirling flames
LES of recirculation and vortex breakdown in swirling flames
In this study large eddy simulation (LES) technique has been applied to predict a selected swirling flame from the Sydney swirl burner experiments. The selected flame is known as the SM1 flame operated with fuel CH4 at a swirl number of 0.5. In the numerical method used, the governing equations for mass, momentum and mixture fraction have been solved on a structured Cartesian grid with 1 million cells. Smagorinsky eddy viscosity model with the localised dynamic procedure of Piomelli and Liu is used as the subgrid scale turbulence model. The conserved scalar mixture fraction based thermo-chemical variables are described using the steady laminar flamelet model. The GRI 2.11 is used as the chemical mechanism. The Favre filtered scalars are obtained from the presumed beta probability density function approach. With appropriate inflow and outflow boundary conditions LES predicts the upstream recirculation zone generated by the bluff body and the downstream vortex breakdown zone induced by swirl with a high level of accuracy. Detailed comparison of LES results with experimental measurements show that the mean velocity field and their rms fluctuations are predicted very well. The predictions for the mean mixture fraction, subgrid variance and temperature are also successful at most axial locations. The study demonstrates that LES together with the laminar flamelet model provides a good technique for predicting the structure of turbulent swirling flames.
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Malalasekera, W
f4f0cbe7-e395-41f8-acd5-d5c93e31928e
Ibrahim, S.S
ea463b62-a55d-41de-b17b-ec1288c81ab4
Masri, A.R
0332133b-c52c-4924-8bef-19d402155db8
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Malalasekera, W
f4f0cbe7-e395-41f8-acd5-d5c93e31928e
Ibrahim, S.S
ea463b62-a55d-41de-b17b-ec1288c81ab4
Masri, A.R
0332133b-c52c-4924-8bef-19d402155db8

Ranga Dinesh, K.K.J., Malalasekera, W, Ibrahim, S.S and Masri, A.R (2007) LES of recirculation and vortex breakdown in swirling flames. Fifth Mediterranean Combustion Symposium (MCS5), Monastir, Tunisia. 09 - 13 Sep 2007. 12 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

In this study large eddy simulation (LES) technique has been applied to predict a selected swirling flame from the Sydney swirl burner experiments. The selected flame is known as the SM1 flame operated with fuel CH4 at a swirl number of 0.5. In the numerical method used, the governing equations for mass, momentum and mixture fraction have been solved on a structured Cartesian grid with 1 million cells. Smagorinsky eddy viscosity model with the localised dynamic procedure of Piomelli and Liu is used as the subgrid scale turbulence model. The conserved scalar mixture fraction based thermo-chemical variables are described using the steady laminar flamelet model. The GRI 2.11 is used as the chemical mechanism. The Favre filtered scalars are obtained from the presumed beta probability density function approach. With appropriate inflow and outflow boundary conditions LES predicts the upstream recirculation zone generated by the bluff body and the downstream vortex breakdown zone induced by swirl with a high level of accuracy. Detailed comparison of LES results with experimental measurements show that the mean velocity field and their rms fluctuations are predicted very well. The predictions for the mean mixture fraction, subgrid variance and temperature are also successful at most axial locations. The study demonstrates that LES together with the laminar flamelet model provides a good technique for predicting the structure of turbulent swirling flames.

Text
__soton.ac.uk_ude_personalfiles_users_jkk1d12_mydesktop_RANGADINESH_SOTON2013TO2017_ConferencePapersforEprints_2007_MSC_2007.doc - Author's Original
Download (480kB)

More information

Published date: September 2007
Venue - Dates: Fifth Mediterranean Combustion Symposium (MCS5), Monastir, Tunisia, 2007-09-09 - 2007-09-13
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 347915
URI: http://eprints.soton.ac.uk/id/eprint/347915
PURE UUID: 0fe52834-87b9-4046-b5ee-a6046c1a534b
ORCID for K.K.J. Ranga Dinesh: ORCID iD orcid.org/0000-0001-9176-6834

Catalogue record

Date deposited: 12 Feb 2013 14:42
Last modified: 15 Mar 2024 03:46

Export record

Contributors

Author: W Malalasekera
Author: S.S Ibrahim
Author: A.R Masri

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×