Stabilization mechanism of lifted flame edge in the near field of coflow jets for diluted methane

S. H. Won, J. Kim, K. J. Hong, Min Suk Cha, Suk Ho Chung*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

37 Scopus citations

Abstract

The stabilization mechanism of lifted flames in the near field of coflow jets has been investigated experimentally and numerically for methane fuel diluted with nitrogen. The lifted flames were observed only in the near field of coflow jets until blowout occurred in the normal gravity condition. To elucidate the stabilization mechanism for the stationary lifted flames of methane having the Schmidt number smaller than unity, the behavior of the flame in the buoyancy-free condition, and unsteady propagation characteristics after ignition were investigated numerically at various conditions of jet velocity. It has been found that buoyancy plays an important role for flame stabilization of lifted flames under normal gravity, such that the flame becomes attached to the nozzle in microgravity. The stabilization mechanism is found to be due to the variation of the propagation speed of the lifted flame edge with axial distance from the nozzle in the near field of the coflow as compared to the local flow velocity variation at the edge.

Original languageEnglish (US)
Pages (from-to)339-347
Number of pages9
JournalProceedings of the Combustion Institute
Volume30
Issue number1
DOIs
StatePublished - Jan 1 2005
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

Keywords

  • Bibrachial flame
  • Coflow jet
  • Edge flame
  • Lifted flame
  • Tribrachial flame

ASJC Scopus subject areas

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

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