Effect of velocity gradient on propagation speed of tribrachial flames in laminar coflow jets

M. K. Kim, S. H. Won, Suk Ho Chung*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

25 Scopus citations

Abstract

The effect of velocity gradient on the propagation speed of tribrachial flame edge has been investigated experimentally in laminar coflow jets for propane fuel. It was observed that the propagation speed of tribrachial flame showed appreciable deviations at various jet velocities in high mixture fraction gradient regime. From the similarity solutions, it was demonstrated that the velocity gradient varied significantly during the flame propagation. To examine the effect of velocity gradient, detail structures of tribrachial flames were investigated from OH LIF images and Abel transformed images of flame luminosity. It was revealed that the tribrachial point was located on the slanted surface of the premixed wing, and this slanted angle was correlated with the velocity gradient along the stoichiometric contour. The temperature field was visualized qualitatively by the Rayleigh scattering image. The propagation speed of tribrachial flame was corrected by considering the direction of flame propagation with the slanted angle and effective heat conduction to upstream. The corrected propagation speed of tribrachial flame was correlated well. Thus, the mixture fraction gradient together with the velocity gradient affected the propagation speed.

Original languageEnglish (US)
Pages (from-to)901-908
Number of pages8
JournalProceedings of the Combustion Institute
Volume31 I
Issue number1
DOIs
StatePublished - Jan 1 2007
Event31st International Symposium on Combustion - Heidelberg, Germany
Duration: Aug 5 2006Aug 11 2006

Keywords

  • Edge flame
  • Mixture fraction gradient
  • Tribrachial flame
  • Velocity gradient

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Effect of velocity gradient on propagation speed of tribrachial flames in laminar coflow jets'. Together they form a unique fingerprint.

Cite this