Effects of swirl on intermittency characteristics in turbulent non-premixed flames
Effects of swirl on intermittency characteristics in turbulent non-premixed flames
Swirl effects on velocity, mixture fraction and temperature intermittency have been analysed for turbulent methane flames using LES. The LES solves the filtered governing equations on a structured Cartesian grid using a finite volume method, with turbulence and combustion modelling based on the localised dynamic Smagorinsky and the steady laminar flamelet models respectively. Probability density function (pdf) distributions demonstrate a Gaussian shape closer to the centreline region of the flame and a delta function at the far radial position. However, non-Gaussian pdfs are observed for velocity and mixture fraction on the centreline in a region where centre jet precession occurs. Non-Gaussian behaviour is also observed for the temperature pdfs close to the centreline region of the flame. Due to the occurrence of recirculation zones, the variation from turbulent to non turbulent flow is more rapid for the velocity than the mixture fraction and therefore indicates how rapidly turbulence affects the molecular transport in these regions of the flame.
629-659
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jenkins, K.W.
4ca70a5c-46dd-40bf-ae46-9efa3790f8ea
Kirkpatrick, M.P.
cf76adda-898f-472d-a93a-c55d29b06fba
Malalasekera, W.
d3bc4153-1af3-41ab-9e42-4aa0d7cbaec7
2012
Ranga Dinesh, K.K.J.
6454b22c-f505-40f9-8ad4-a1168e8f87cd
Jenkins, K.W.
4ca70a5c-46dd-40bf-ae46-9efa3790f8ea
Kirkpatrick, M.P.
cf76adda-898f-472d-a93a-c55d29b06fba
Malalasekera, W.
d3bc4153-1af3-41ab-9e42-4aa0d7cbaec7
Ranga Dinesh, K.K.J., Jenkins, K.W., Kirkpatrick, M.P. and Malalasekera, W.
(2012)
Effects of swirl on intermittency characteristics in turbulent non-premixed flames.
Combustion Science and Technology, 184 (5), .
(doi:10.1080/00102202.2011.653460).
Abstract
Swirl effects on velocity, mixture fraction and temperature intermittency have been analysed for turbulent methane flames using LES. The LES solves the filtered governing equations on a structured Cartesian grid using a finite volume method, with turbulence and combustion modelling based on the localised dynamic Smagorinsky and the steady laminar flamelet models respectively. Probability density function (pdf) distributions demonstrate a Gaussian shape closer to the centreline region of the flame and a delta function at the far radial position. However, non-Gaussian pdfs are observed for velocity and mixture fraction on the centreline in a region where centre jet precession occurs. Non-Gaussian behaviour is also observed for the temperature pdfs close to the centreline region of the flame. Due to the occurrence of recirculation zones, the variation from turbulent to non turbulent flow is more rapid for the velocity than the mixture fraction and therefore indicates how rapidly turbulence affects the molecular transport in these regions of the flame.
Text
CST1_2012.doc
- Author's Original
More information
e-pub ahead of print date: 14 May 2012
Published date: 2012
Organisations:
Engineering Science Unit
Identifiers
Local EPrints ID: 347363
URI: http://eprints.soton.ac.uk/id/eprint/347363
ISSN: 0010-2202
PURE UUID: 9fa3ecde-de60-4ede-93cc-e79c4ce4817b
Catalogue record
Date deposited: 24 Jan 2013 16:02
Last modified: 15 Mar 2024 03:46
Export record
Altmetrics
Contributors
Author:
K.W. Jenkins
Author:
M.P. Kirkpatrick
Author:
W. Malalasekera
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
