Experimental studies of new flame regimes and dynamics of non-premixed combustion in a confined channel

Sang Hee Won, Bo Xu, Yiguang Ju

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effects of channel width, wall temperature, and flow rate on the flame regimes and propagation speeds of non-premix flames in a mesoscale combustor were studied in methane and propane-air-oxygen mixing layers. A flame street structure which consists of multiple triple flamelets in the mixing layer of the reactants was observed experimentally. Depending on the flow rate, it was found that there are two different flame regimes, an unsteady bimodal flame regime and a flame street regime where there are multiple stable triple flamelets. It was found that the separation distance of the flamelets increased due to the dilution effect of the products and that the size of the flamelets was proportional to the width of the mixing layer. A scale analytical model was developed to qualitatively explain the mechanism of flame streets. The propagation speed of the mesocale non-premixed flame cell was measured. It was found that the edge flame speed was significantly faster than that the conventional triple flame. The effects of wall heat loss and friction were discussed. A model of pressure gradient assisted flame propagation was proposed.

Original languageEnglish (US)
Title of host publication47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781563479694
DOIs
StatePublished - 2009

Publication series

Name47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

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