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Onset of cellular flame instability in adiabatic CH4/O-2/CO2 and CH4/air laminar premixed flames stabilized on a flat-flame burner

Yu, Jiangfei LU ; Yu, Rixin LU ; Fan, Xiaoqiang LU ; Christensen, Moah LU ; Konnov, Alexander LU and Bai, Xue-Song LU (2013) In Combustion and Flame 160(7). p.1276-1286
Abstract
This paper presents numerical and experimental studies on the onset and evolution of laminar cellular flames of CH4/O-2/CO2 (oxy-fuel) and CH4/air mixtures under adiabatic conditions, stabilized in the proximity of a flat-flame burner at atmospheric pressure. In the numerical simulations, a two-dimensional domain with periodicity at the transverse far field boundaries is resolved using a high accuracy finite difference method and employing a detailed chemical kinetic mechanism and detailed transport properties. In the experiments a specially designed adiabatic flat-flame burner, a so-called heat flux burner, is employed. A key parameter, the standoff distance between the flame front and the burner exit plate, is identified. A critical... (More)
This paper presents numerical and experimental studies on the onset and evolution of laminar cellular flames of CH4/O-2/CO2 (oxy-fuel) and CH4/air mixtures under adiabatic conditions, stabilized in the proximity of a flat-flame burner at atmospheric pressure. In the numerical simulations, a two-dimensional domain with periodicity at the transverse far field boundaries is resolved using a high accuracy finite difference method and employing a detailed chemical kinetic mechanism and detailed transport properties. In the experiments a specially designed adiabatic flat-flame burner, a so-called heat flux burner, is employed. A key parameter, the standoff distance between the flame front and the burner exit plate, is identified. A critical standoff distance is found, above which cellular flame instability is observed. It is shown that the critical standoff distance is closely related to the density ratio and the laminar flame thickness for each flame studied. The observed onset of cellular flames is governed by the hydrodynamic instability mechanism, which is generally suppressed by the burner when the flame is very close to the burner plate. Diffusive-thermal effects play an important role in the flame instability when the flame is far from the burner. The critical standoff distance has no clear correlation with the Lewis number, indicating a less significant effect of diffusive-thermal instability on the flames near the burner. (c) 2013 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
Cellular premixed flame, Oxy-fuel combustion, Heat flux method, Flat-flame burner, Hydrodynamic instability
in
Combustion and Flame
volume
160
issue
7
pages
1276 - 1286
publisher
Elsevier
external identifiers
  • wos:000319850800010
  • scopus:84876695952
ISSN
0010-2180
DOI
10.1016/j.combustflame.2013.02.011
language
English
LU publication?
yes
id
353f4d1c-1f87-4578-b592-ee5fa98ebe69 (old id 3920933)
date added to LUP
2013-07-17 14:17:36
date last changed
2019-08-14 02:34:06
@article{353f4d1c-1f87-4578-b592-ee5fa98ebe69,
  abstract     = {This paper presents numerical and experimental studies on the onset and evolution of laminar cellular flames of CH4/O-2/CO2 (oxy-fuel) and CH4/air mixtures under adiabatic conditions, stabilized in the proximity of a flat-flame burner at atmospheric pressure. In the numerical simulations, a two-dimensional domain with periodicity at the transverse far field boundaries is resolved using a high accuracy finite difference method and employing a detailed chemical kinetic mechanism and detailed transport properties. In the experiments a specially designed adiabatic flat-flame burner, a so-called heat flux burner, is employed. A key parameter, the standoff distance between the flame front and the burner exit plate, is identified. A critical standoff distance is found, above which cellular flame instability is observed. It is shown that the critical standoff distance is closely related to the density ratio and the laminar flame thickness for each flame studied. The observed onset of cellular flames is governed by the hydrodynamic instability mechanism, which is generally suppressed by the burner when the flame is very close to the burner plate. Diffusive-thermal effects play an important role in the flame instability when the flame is far from the burner. The critical standoff distance has no clear correlation with the Lewis number, indicating a less significant effect of diffusive-thermal instability on the flames near the burner. (c) 2013 The Combustion Institute. Published by Elsevier Inc. All rights reserved.},
  author       = {Yu, Jiangfei and Yu, Rixin and Fan, Xiaoqiang and Christensen, Moah and Konnov, Alexander and Bai, Xue-Song},
  issn         = {0010-2180},
  keyword      = {Cellular premixed flame,Oxy-fuel combustion,Heat flux method,Flat-flame burner,Hydrodynamic instability},
  language     = {eng},
  number       = {7},
  pages        = {1276--1286},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {Onset of cellular flame instability in adiabatic CH4/O-2/CO2 and CH4/air laminar premixed flames stabilized on a flat-flame burner},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2013.02.011},
  volume       = {160},
  year         = {2013},
}