Advanced

High resolution imaging of flameless and distributed turbulent combustion

Duwig, Christophe LU ; Li, Bo LU ; Li, Zhongshan LU and Aldén, Marcus LU (2012) In Combustion and Flame 159(1). p.306-316
Abstract
Planar laser-induced fluorescence (PLIF) and Rayleigh scattering measurements were used for the study of turbulence/combustion interactions in distributed reaction regimes including flameless or MILD combustion. A novel laboratory scale burner (Distributed and Flameless Combustion Burner - DFCB) was used to reach uniquely high Karlovitz numbers, presently reported up to 14,400. It consists of a highly turbulent piloted high speed jet burner with a vitiated coflow. Six cases are reported whereas two of them (leaner cases) led to an invisible reacting zone, though still emitting light in the UV and near infrared range. Simultaneous OH/CH(2)O PLIF image with 50 mu m spatial resolution were achieved to capture the variation of intermediate... (More)
Planar laser-induced fluorescence (PLIF) and Rayleigh scattering measurements were used for the study of turbulence/combustion interactions in distributed reaction regimes including flameless or MILD combustion. A novel laboratory scale burner (Distributed and Flameless Combustion Burner - DFCB) was used to reach uniquely high Karlovitz numbers, presently reported up to 14,400. It consists of a highly turbulent piloted high speed jet burner with a vitiated coflow. Six cases are reported whereas two of them (leaner cases) led to an invisible reacting zone, though still emitting light in the UV and near infrared range. Simultaneous OH/CH(2)O PLIF image with 50 mu m spatial resolution were achieved to capture the variation of intermediate species in the reaction layer. When complemented with temperature images obtained by Rayleigh scattering measurement, it provided insights of the reaction front structures as well as measures of the flame brush thicknesses. In particular, variations in the jet velocity highlighted the influence of turbulent mixing (hence turbulence/chemistry interaction) on the flame structures as depicted by the formation of relatively large pools of CH(2)O. Further, variations in the jet stoichiometry impacted on the reaction zone visibility but only marginally on the intensity and moderately on the overall shape of the OH and CH(2)O signals. (C) 2011 The Combustion Institute. Published by Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Flameless combustion, Distributed reaction regime, Turbulence/chemistry, interaction, Planar laser-induced fluorescence, Rayleigh scattering
in
Combustion and Flame
volume
159
issue
1
pages
306 - 316
publisher
Elsevier
external identifiers
  • wos:000298071400027
  • scopus:83255170531
ISSN
0010-2180
DOI
10.1016/j.combustflame.2011.06.018
language
English
LU publication?
yes
id
eaeaa195-d153-4b85-8487-7ffca8b64e10 (old id 2362673)
date added to LUP
2012-02-23 14:09:16
date last changed
2017-10-01 04:31:58
@article{eaeaa195-d153-4b85-8487-7ffca8b64e10,
  abstract     = {Planar laser-induced fluorescence (PLIF) and Rayleigh scattering measurements were used for the study of turbulence/combustion interactions in distributed reaction regimes including flameless or MILD combustion. A novel laboratory scale burner (Distributed and Flameless Combustion Burner - DFCB) was used to reach uniquely high Karlovitz numbers, presently reported up to 14,400. It consists of a highly turbulent piloted high speed jet burner with a vitiated coflow. Six cases are reported whereas two of them (leaner cases) led to an invisible reacting zone, though still emitting light in the UV and near infrared range. Simultaneous OH/CH(2)O PLIF image with 50 mu m spatial resolution were achieved to capture the variation of intermediate species in the reaction layer. When complemented with temperature images obtained by Rayleigh scattering measurement, it provided insights of the reaction front structures as well as measures of the flame brush thicknesses. In particular, variations in the jet velocity highlighted the influence of turbulent mixing (hence turbulence/chemistry interaction) on the flame structures as depicted by the formation of relatively large pools of CH(2)O. Further, variations in the jet stoichiometry impacted on the reaction zone visibility but only marginally on the intensity and moderately on the overall shape of the OH and CH(2)O signals. (C) 2011 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Duwig, Christophe and Li, Bo and Li, Zhongshan and Aldén, Marcus},
  issn         = {0010-2180},
  keyword      = {Flameless combustion,Distributed reaction regime,Turbulence/chemistry,interaction,Planar laser-induced fluorescence,Rayleigh scattering},
  language     = {eng},
  number       = {1},
  pages        = {306--316},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {High resolution imaging of flameless and distributed turbulent combustion},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2011.06.018},
  volume       = {159},
  year         = {2012},
}