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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

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Author

Summary, in English

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.

Publishing year

2013

Language

English

Pages

14866-14878

Publication/Series

International Journal of Hydrogen Energy

Volume

38

Issue

34

Document type

Journal article

Publisher

Elsevier

Topic

  • Fluid Mechanics and Acoustics

Keywords

  • Hydrogen
  • Cellular flames
  • Diffusional-thermal instability
  • Hydrodynamic
  • instability
  • Detailed numerical simulation
  • Heat-flux burner

Status

Published

ISBN/ISSN/Other

  • ISSN: 1879-3487