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Structures and stabilization of low calorific value gas turbulent partially premixed flames in a conical burner

Yan, Beibei LU ; Li, Bo LU ; Baudoin, Eric LU ; Liu, Changye LU ; Sun, Zhiwei LU ; Li, Zhongshan LU ; Bai, Xue-Song LU ; Aldén, Marcus LU ; Chen, G. and Mansour, M. S. (2010) 6th Miditerranean Combustion Symposium In Experimental Thermal and Fluid Science 34(3). p.412-419
Abstract
Experiments are carried out on partially premixed turbulent flames stabilized in a conical burner. The investigated gaseous fuels are methane, methane diluted with nitrogen, and Mixtures of CH4, CO, CO2, H-2 and N-2, Simulating typical products from gasification of biomass, and co-firing of gasification gas with methane. The fuel and air are partially premixed in concentric tubes. Flame stabilization behavior is investigated and significantly different stabilization characteristics are observed in flames with and without the cone. Planar laser induced fluorescence (LIF) imaging of a fuel-tracer species, acetone, and OH radicals is carried out to characterize the flame structures. Large eddy simulations of the conical flames are carried out... (More)
Experiments are carried out on partially premixed turbulent flames stabilized in a conical burner. The investigated gaseous fuels are methane, methane diluted with nitrogen, and Mixtures of CH4, CO, CO2, H-2 and N-2, Simulating typical products from gasification of biomass, and co-firing of gasification gas with methane. The fuel and air are partially premixed in concentric tubes. Flame stabilization behavior is investigated and significantly different stabilization characteristics are observed in flames with and without the cone. Planar laser induced fluorescence (LIF) imaging of a fuel-tracer species, acetone, and OH radicals is carried out to characterize the flame structures. Large eddy simulations of the conical flames are carried out to gain further understanding of the flame/flow interaction in the cone. The data show that the flames with the cone are more stable than those without the cone. Without the cone (i.e. jet burner) the critical jet velocities for blowoff and liftoff of biomass derived gases are higher than that for methane/nitrogen mixture with the same heating values, indicating the enhanced flame stabilization by hydrogen in the mixture. With the cone the stability of flames is not sensitive to the compositions of the fuels, owing to the different flame stabilization mechanism in the conical flames than that in the jet flames. From the PLIF images it is shown that in the conical burner, the flame is stabilized by the cone at nearly the same position for different fuels. From large eddy simulations, the flames are shown to be controlled by the recirculation flows inside cone, which depends on the cone angle, but less sensitive to the fuel compositions and flow speed. The flames tend to be hold in the recirculation zones even at very high flow speed. Flame blowoff occurs when significant local extinction in the main body of the flame appears at high turbulence intensities. (C) 2009 Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Local flame extinction, Flame stability, Conical burner, Low calorific gas flames, Partially premixed flames
in
Experimental Thermal and Fluid Science
volume
34
issue
3
pages
412 - 419
publisher
Elsevier
conference name
6th Miditerranean Combustion Symposium
external identifiers
  • wos:000275363600023
  • scopus:75449098663
ISSN
1879-2286
0894-1777
DOI
10.1016/j.expthermflusci.2009.10.011
language
English
LU publication?
yes
id
6127c34f-4dcd-4066-9a01-84848f4c20c6 (old id 1588416)
date added to LUP
2010-04-20 15:50:33
date last changed
2018-05-29 12:16:00
@inproceedings{6127c34f-4dcd-4066-9a01-84848f4c20c6,
  abstract     = {Experiments are carried out on partially premixed turbulent flames stabilized in a conical burner. The investigated gaseous fuels are methane, methane diluted with nitrogen, and Mixtures of CH4, CO, CO2, H-2 and N-2, Simulating typical products from gasification of biomass, and co-firing of gasification gas with methane. The fuel and air are partially premixed in concentric tubes. Flame stabilization behavior is investigated and significantly different stabilization characteristics are observed in flames with and without the cone. Planar laser induced fluorescence (LIF) imaging of a fuel-tracer species, acetone, and OH radicals is carried out to characterize the flame structures. Large eddy simulations of the conical flames are carried out to gain further understanding of the flame/flow interaction in the cone. The data show that the flames with the cone are more stable than those without the cone. Without the cone (i.e. jet burner) the critical jet velocities for blowoff and liftoff of biomass derived gases are higher than that for methane/nitrogen mixture with the same heating values, indicating the enhanced flame stabilization by hydrogen in the mixture. With the cone the stability of flames is not sensitive to the compositions of the fuels, owing to the different flame stabilization mechanism in the conical flames than that in the jet flames. From the PLIF images it is shown that in the conical burner, the flame is stabilized by the cone at nearly the same position for different fuels. From large eddy simulations, the flames are shown to be controlled by the recirculation flows inside cone, which depends on the cone angle, but less sensitive to the fuel compositions and flow speed. The flames tend to be hold in the recirculation zones even at very high flow speed. Flame blowoff occurs when significant local extinction in the main body of the flame appears at high turbulence intensities. (C) 2009 Elsevier Inc. All rights reserved.},
  author       = {Yan, Beibei and Li, Bo and Baudoin, Eric and Liu, Changye and Sun, Zhiwei and Li, Zhongshan and Bai, Xue-Song and Aldén, Marcus and Chen, G. and Mansour, M. S.},
  booktitle    = {Experimental Thermal and Fluid Science},
  issn         = {1879-2286},
  keyword      = {Local flame extinction,Flame stability,Conical burner,Low calorific gas flames,Partially premixed flames},
  language     = {eng},
  number       = {3},
  pages        = {412--419},
  publisher    = {Elsevier},
  title        = {Structures and stabilization of low calorific value gas turbulent partially premixed flames in a conical burner},
  url          = {http://dx.doi.org/10.1016/j.expthermflusci.2009.10.011},
  volume       = {34},
  year         = {2010},
}