The turbulent flame speed of premixed spherically expanding flames

G. K. Giannakopoulos, C. E. Frouzakis, Moshe Matalon, A. G. Tomboulides

Research output: Contribution to journalArticlepeer-review

Abstract

Premixed syngas/air flames expanding in turbulent flow fields are investigated using large scale direct numerical simulations. A parametric analysis is performed in circular and spherical geometries for the detailed investigation of the interaction between the flame front and the turbulent flow field. A stoichiometric syngas-air mixture with molar ratio CO/H2=3 is considered at conditions relevant to internal combustion engines. The dependence of the integral heat release rate on the characteristics of the flow field (integral length scale and turbulent intensity) is discussed. The long-term evolution of important global flame quantities is analyzed, and the mechanisms that dominate the growth of the flame kernel are identified. An expression for the speed of turbulent premixed spherical flames is formulated, based on the rate of change of the surface area of the flame.

Original languageEnglish (US)
Pages (from-to)415-421
Number of pages7
JournalERCOFTAC Series
Volume24
DOIs
StatePublished - Jan 1 2018

Keywords

  • Spherically expanding flame
  • Syngas flames
  • Turbulent flame speed
  • Turbulent premixed flame

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Computational Mathematics

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