A role of local planar flame speed variations in the global finger-flame acceleration scenario

Sinan Demir, Hayri Sezer, V'yacheslav Akkerman

Research output: Contribution to conferencePaperpeer-review

Abstract

The majority of formulations describing the flame acceleration scenarios are based on a "geometrical consideration", when the wrinkled-to-planar flame velocities ratio, Sw/SL, is evaluated as the scaled flame surface area, while the entire combustion chemistry is immersed into the planar flame speed SL, which is assumed to be constant. However, SL may experience noticeable spatial/temporal variations in the practical reality, in particular, due to a non-uniform distribution of the equivalence ratio and/or dust impurities. The present work initiates the systematic study of the effect of local SL - variations on the global flame evolution scenario. The variations are assumed to be externally imposed, in a manner being a free functional of the formulation. Specifically, linear, parabolic and hyperbolic spatial SL - distributions are incorporated into the theory of finger flame acceleration in pipes. The conditions promoting or moderating the flame acceleration are identified, and the revisited formulae for the flame shape, velocity and acceleration rate are obtained for different SL - distributions in the two-dimensional and axisymmetric cylindrical geometries.

Original languageEnglish
StatePublished - 2016
Event2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016 - Princeton, United States
Duration: Mar 13 2016Mar 16 2016

Conference

Conference2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016
Country/TerritoryUnited States
CityPrinceton
Period03/13/1603/16/16

Scopus Subject Areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • General Chemical Engineering

Keywords

  • Corrugated flame speed
  • Finger flames
  • Flame acceleration
  • Laminar flame speed

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