Effective geometric front dynamics for premixed turbulent combustion with separated velocity scales

P. F. Embid, A. J. Majda, P. E. Souganidis

Research output: Contribution to journalArticle

Abstract

We study the large scale effective flame front equations for premixed turbulent combustion with separated scale turbulent velocity fields recently formulated and derived by Majda and Souganidis. For the particular case of a steady incompressible velocity field consisting of a mean flow plus a small scale periodic shear we use analytical expressions and numerical quadrature to study the effective turbulent flame front velocity, its dependence on the turbulence intensity, and the role played by the mean flow. In general the dependence of the turbulent flame speed on the turbulence intensity is nonlinear, and the local logarithmic rate of growth can take a continuum of values, depending on the magnitudes of the mean and turbulent intensities. In the weak turbulence limit this dependence can be either linear or quadratic, depending on the magnitude and direction of the mean flow relative to the shear. In the strong turbulence limit the dependence is always linear. This behavior is documented for various forms of the small scale shear flow.

Original languageEnglish (US)
Pages (from-to)85-115
Number of pages31
JournalCombustion Science and Technology
Volume103
Issue number1-6
DOIs
StatePublished - Dec 15 1994

Keywords

  • Premixed turbulent combustion
  • enhanced flame speeds

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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