Hydrodynamic and thermodiffusive instability effects on the evolution of laminar planar lean premixed hydrogen flames

C. Altantzis, C. E. Frouzakis, A. G. Tomboulides, Moshe Matalon, K. Boulouchos

Research output: Contribution to journalArticle

Abstract

Numerical simulations with single-step chemistry and detailed transport are used to study premixed hydrogen/air flames in two-dimensional channel-like domains with periodic boundary conditions along the horizontal boundaries as a function of the domain height. Both unity Lewis number, where only hydrodynamic instability appears, and subunity Lewis number, where the flame propagation is strongly affected by the combined effect of hydrodynamic and thermodiffusive instabilities are considered. The simulations aim at studying the initial linear growth of perturbations superimposed on the planar flame front as well as the long-term nonlinear evolution. The dispersion relation between the growth rate and the wavelength of the perturbation characterizing the linear regime is extracted from the simulations and compared with linear stability theory. The dynamics observed during the nonlinear evolution depend strongly on the domain size and on the Lewis number. As predicted by the theory, unity Lewis number flames are found to form a single cusp structure which propagates unchanged with constant speed. The long-term dynamics of the subunity Lewis number flames include steady cell propagation, lateral flame movement, oscillations and regular as well as chaotic cell splitting and merging.

Original languageEnglish (US)
Pages (from-to)329-361
Number of pages33
JournalJournal of Fluid Mechanics
Volume700
DOIs
StatePublished - Jun 10 2012

Fingerprint

Lewis numbers
flames
Hydrodynamics
hydrodynamics
Hydrogen
hydrogen
flame propagation
unity
Merging
perturbation
Boundary conditions
simulation
Wavelength
cells
cusps
Computer simulation
Air
chemistry
boundary conditions
oscillations

Keywords

  • combustion
  • flames
  • instability
  • laminar reacting flows

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Hydrodynamic and thermodiffusive instability effects on the evolution of laminar planar lean premixed hydrogen flames. / Altantzis, C.; Frouzakis, C. E.; Tomboulides, A. G.; Matalon, Moshe; Boulouchos, K.

In: Journal of Fluid Mechanics, Vol. 700, 10.06.2012, p. 329-361.

Research output: Contribution to journalArticle

Altantzis, C. ; Frouzakis, C. E. ; Tomboulides, A. G. ; Matalon, Moshe ; Boulouchos, K. / Hydrodynamic and thermodiffusive instability effects on the evolution of laminar planar lean premixed hydrogen flames. In: Journal of Fluid Mechanics. 2012 ; Vol. 700. pp. 329-361.
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