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Large eddy simulations of swirling non-premixed flames with flamelet models: a comparison of numerical methods

Large eddy simulations of swirling non-premixed flames with flamelet models: a comparison of numerical methods
Large eddy simulations of swirling non-premixed flames with flamelet models: a comparison of numerical methods
This work investigates the application of large eddy simulation (LES) to selected cases of the turbulent non premixed Sydney swirl flames. Two research groups (Loughborough University, LU and Imperial College, IC) have simulated these cases for different parameter sets, using two different and independent LES methods. The simulations of the non-reactive turbulent flow predicted the experimental results with good agreement and both simulations captured the recirculation structures and the vortex breakdown without major difficulties. For the reactive cases, the LES predictions were less satisfactory, and using two independent simulations has helped to understand the shortcomings of each. Furthermore one of the flames (SMH2) was found to be exceptionally hard to predict, which was supported by the lower amount of turbulent kinetic energy that was resolved in this case. However, the LES has identified modes of flame instability that were similar to those observed in some of the experiments.
1386-6184
523-561
Kempf, A.
c14f3207-8950-4613-af22-08dbfae69150
Malalasekera, W.
d3bc4153-1af3-41ab-9e42-4aa0d7cbaec7
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Stein, O.
9f2794af-a5b3-4442-9c53-01b28369a35c
Kempf, A.
c14f3207-8950-4613-af22-08dbfae69150
Malalasekera, W.
d3bc4153-1af3-41ab-9e42-4aa0d7cbaec7
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Stein, O.
9f2794af-a5b3-4442-9c53-01b28369a35c

Kempf, A., Malalasekera, W., Ranga Dinesh, K.K.J. and Stein, O. (2008) Large eddy simulations of swirling non-premixed flames with flamelet models: a comparison of numerical methods. Flow Turbulence and Combustion, 81 (4), 523-561. (doi:10.1007/s10494-008-9147-1).

Record type: Article

Abstract

This work investigates the application of large eddy simulation (LES) to selected cases of the turbulent non premixed Sydney swirl flames. Two research groups (Loughborough University, LU and Imperial College, IC) have simulated these cases for different parameter sets, using two different and independent LES methods. The simulations of the non-reactive turbulent flow predicted the experimental results with good agreement and both simulations captured the recirculation structures and the vortex breakdown without major difficulties. For the reactive cases, the LES predictions were less satisfactory, and using two independent simulations has helped to understand the shortcomings of each. Furthermore one of the flames (SMH2) was found to be exceptionally hard to predict, which was supported by the lower amount of turbulent kinetic energy that was resolved in this case. However, the LES has identified modes of flame instability that were similar to those observed in some of the experiments.

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Published date: 1 December 2008
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 347343
URI: http://eprints.soton.ac.uk/id/eprint/347343
ISSN: 1386-6184
PURE UUID: 048d49ba-f07e-4ac4-bad3-dcae8aa40275
ORCID for K.K.J. Ranga Dinesh: ORCID iD orcid.org/0000-0001-9176-6834

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Date deposited: 24 Jan 2013 15:53
Last modified: 15 Mar 2024 03:46

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Contributors

Author: A. Kempf
Author: W. Malalasekera
Author: O. Stein

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