Edge flames stabilized in a non-premixed microcombustor

Joanna A. Bieri, Moshe Matalon

Research output: Contribution to journalArticlepeer-review

Abstract

The dynamics of an edge flame confined in a non-premixed microcombustor model is studied numerically within the context of a diffusive-thermal model. Fuel and oxidizer, separated upstream by a thin plate, flow through a channel with a prescribed velocity. At the tip of the plate, the fuel and oxidizer mix and,when ignited, an edge flame is sustained at some distance from the plate. The objective in this work is to consider the effects of confinement, differential diffusion, and heat loss on the dynamics of an edge flame in a narrow channel. We consider a wide range of channel widths and allow for changing Lewis numbers, and both adiabatic conditions and heat losses along the channel walls. The results illustrate how the flame shape and standoff distance are affected by the channel width, by mixture composition through variations in Lewis numbers and by heat losses. Conditions for flame stabilization, flame oscillations and flame extinction or blowoff are predicted.

Original languageEnglish (US)
Pages (from-to)911-932
Number of pages22
JournalCombustion Theory and Modelling
Volume15
Issue number6
DOIs
StatePublished - 2011

Keywords

  • Diffusion flame
  • Edge flame
  • Flame oscillation
  • Heat loss
  • Microcombustion

ASJC Scopus subject areas

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

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