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Onset of cellular instability in adiabatic H-2/O-2/N-2 premixed flames anchored to a flat-flame heat-flux burner

Yu, Jiangfei LU ; Yu, Rixin LU and Bai, Xue-Song LU (2013) In International Journal of Hydrogen Energy 38(34). p.14866-14878
Abstract
The onset of cellular instability in adiabatic H-2/O-2/N-2 premixed flames anchored to a heat-flux burner is investigated numerically. Both hydrodynamic instability and diffusional-thermal instability are shown to play an important role in the onset of cellular flames. The burner can effectively suppress cellular instability when the flames are close to the burner, otherwise the burner can suppress the instabilities only at large wavenumbers. Because of differential diffusion, local extinction can occur in lean H-2/O-2/N-2 flames. When the flames develop to take on cellular shapes, the surface length, the overall heat release rate and the mean burning velocity are all increased. For near stoichiometric fuel-rich flames the mean burning... (More)
The onset of cellular instability in adiabatic H-2/O-2/N-2 premixed flames anchored to a heat-flux burner is investigated numerically. Both hydrodynamic instability and diffusional-thermal instability are shown to play an important role in the onset of cellular flames. The burner can effectively suppress cellular instability when the flames are close to the burner, otherwise the burner can suppress the instabilities only at large wavenumbers. Because of differential diffusion, local extinction can occur in lean H-2/O-2/N-2 flames. When the flames develop to take on cellular shapes, the surface length, the overall heat release rate and the mean burning velocity are all increased. For near stoichiometric fuel-rich flames the mean burning velocity can increase by as much as 20%-30%. For lean flames with an equivalence ratio of 0.56, the mean burning velocity can be 2-3 times of the burning velocity of the corresponding planar flame. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hydrogen, Cellular flames, Diffusional-thermal instability, Hydrodynamic, instability, Detailed numerical simulation, Heat-flux burner
in
International Journal of Hydrogen Energy
volume
38
issue
34
pages
14866 - 14878
publisher
Elsevier
external identifiers
  • wos:000328517700051
  • scopus:84886722188
ISSN
1879-3487
DOI
10.1016/j.ijhydene.2013.09.075
language
English
LU publication?
yes
id
44523e51-0c3d-4b75-b19c-4914edf50526 (old id 4272064)
date added to LUP
2014-02-11 14:02:08
date last changed
2019-06-19 02:18:37
@article{44523e51-0c3d-4b75-b19c-4914edf50526,
  abstract     = {The onset of cellular instability in adiabatic H-2/O-2/N-2 premixed flames anchored to a heat-flux burner is investigated numerically. Both hydrodynamic instability and diffusional-thermal instability are shown to play an important role in the onset of cellular flames. The burner can effectively suppress cellular instability when the flames are close to the burner, otherwise the burner can suppress the instabilities only at large wavenumbers. Because of differential diffusion, local extinction can occur in lean H-2/O-2/N-2 flames. When the flames develop to take on cellular shapes, the surface length, the overall heat release rate and the mean burning velocity are all increased. For near stoichiometric fuel-rich flames the mean burning velocity can increase by as much as 20%-30%. For lean flames with an equivalence ratio of 0.56, the mean burning velocity can be 2-3 times of the burning velocity of the corresponding planar flame. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.},
  author       = {Yu, Jiangfei and Yu, Rixin and Bai, Xue-Song},
  issn         = {1879-3487},
  keyword      = {Hydrogen,Cellular flames,Diffusional-thermal instability,Hydrodynamic,instability,Detailed numerical simulation,Heat-flux burner},
  language     = {eng},
  number       = {34},
  pages        = {14866--14878},
  publisher    = {Elsevier},
  series       = {International Journal of Hydrogen Energy},
  title        = {Onset of cellular instability in adiabatic H-2/O-2/N-2 premixed flames anchored to a flat-flame heat-flux burner},
  url          = {http://dx.doi.org/10.1016/j.ijhydene.2013.09.075},
  volume       = {38},
  year         = {2013},
}