The effect of gas expansion on edge flames stabilized in narrow channels

J. A. Bieri, V. N. Kurdyumov, M. Matalon

Research output: Contribution to journalArticle

Abstract

In this paper we numerically examine the stabilization of an edge flame in a confined mixing layer. Unlike most previous theoretical studies which have assumed, for convenience, that the density is constant and independent of temperature, the present work realistically accounts for density variations and their effect on the flow field. The focus is on the effect of lateral confinement on the flame structure and standoff distance, for both adiabatic conditions and in the presence of conductive losses to the channel walls. The inability of the reactants to diffuse outwards, as they would in an unlimited mixing layer, promotes mixing and as a result the premixed flame segment extends further in the transverse direction, stands farther away from the tip of the splitter plate, and the trailing diffusion flame is much shorter. In very narrow channels the resulting flame is a planar premixed flame that consumes all the supplied reactants. Heat losses cause a drop in temperature and as a result, the premixed flame segment is limited near the channel axis, with a shorter diffusion flame trailing behind.

Original languageEnglish (US)
Pages (from-to)1227-1234
Number of pages8
JournalProceedings of the Combustion Institute
Volume33
Issue number1
DOIs
StatePublished - Jan 10 2011

Keywords

  • Diffusion flame
  • Edge flame
  • Microcombustion
  • Thermal expansion

ASJC Scopus subject areas

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

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