Experimental and numerical investigations of flame pattern formations in a radial microchannel

Aiwu Fan, Sergey Minaev, Evgeniy Sereshchenko, Roman Fursenko, Sudarshan Kumar, Wei Liu, Kaoru Maruta

Research output: Contribution to journalConference articlepeer-review

57 Citations (Scopus)

Abstract

Flame pattern formations in a heated radial microchannel with a gap width of 1.75 mm were investigated experimentally and numerically. A premixed methane-air mixture was introduced at the center of microchannel formed by two parallel quartz discs which were heated with an external porous burner to create a positive temperature gradient condition in the direction of flow. In addition to conventional stable flames, some non-stationary flame patterns termed single- and double-pelton-like flames and the traveling flame were also observed. The double- and single-pelton-like flames occurred at a random possibility under certain conditions, which rotated around the center of the radial microchannel at a frequency of ∼2555 Hz. Regime diagram of all those flame patterns was drawn based on the experimental findings in the mixture equivalence ratio range of 0.65-1.30 and inlet mixture velocity range of 1.5-5.0 m/s. Meanwhile, the experimental results also qualitatively verify our previous theoretical prediction that is the S-shaped dependency of flame radial location on inlet velocity for stoichiometric mixture. Finally, numerical simulations using a global one-step Arrhenius reaction model successfully captured some rotating flame structures that may be associated with single- and double-pelton-like flames observed in the experiments.

Original languageEnglish
Pages (from-to)3059-3066
Number of pages8
JournalProceedings of the Combustion Institute
Volume32 II
DOIs
Publication statusPublished - 2009
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: 2008 Aug 32008 Aug 8

Keywords

  • Flame instability
  • Micro-combustion
  • Pattern formation
  • Radial microchannel
  • Rotating flame

ASJC Scopus subject areas

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

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