Effects of thermal expansion on the stabilization of an edge-flame in a mixing-layer model

V. Kurdyumov, M. Matalon

Research output: Contribution to journalConference article

Abstract

This paper examines the influence of thermal expansion on the stabilization of an edge-flame in a mixing layer. We find, similar to the earlier predictions based on a constant-density model, two modes of flame stabilization: a steady mode at low injection velocities and an oscillatory mode at higher velocities. The gas expansion has an effect on the flame standoff distance: as a result of the reduced density in the preheat zone the flow accelerates when crossing the flame which consequently forces its edge to relocate at an upstream position where its propagation speed balances the gas velocity. The onset of oscillations at relatively high flow rates is predicted with or without invoking the constant-density approximation; the critical conditions of the onset, however, are affected by density variations.

Original languageEnglish (US)
Pages (from-to)1107-1115
Number of pages9
JournalProceedings of the Combustion Institute
Volume32 I
Issue number1
DOIs
StatePublished - Jan 1 2009
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: Aug 3 2008Aug 8 2008

Keywords

  • Diffusion flame
  • Edge flame
  • Instabilities
  • Oscillations
  • Thermal expansion

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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