Extinction of methane/air counterflow partially premixed flames

Tomoya Wada, Masahiko Mizomoto, Takeshi Yokomori, Norbert Peters

Research output: Contribution to journalConference article

12 Citations (Scopus)

Abstract

Flame interactions of partially premixed flames (PPFs) were experimentally and numerically studied using counterflow configurations with CH4/air mixtures under atmospheric condition. The main aims of this study were to describe the flame interactions in terms of variations in global strain rate (K) and to understand flame extinction. Two premixed-fuel streams were characterized by equivalence ratios (φlean and φrich). Experiments were conducted under the following conditions: φlean + φrich = 2, 0.5 < φlean < 0.7 (i.e., 1.3 < φrich < 1.5), and several K values. To describe the interactions, twin flames (TFs), also examined under corresponding φ, were used as a criterion, because the φ values were within the flammability limits. Experimental results of PPFs showed a different behavior than those of TFs: first, three different luminous layers were observed; second, thin single-layered flames, with a nearly constant flame width, were observed near extinction for several combinations of φ third, PPFs could exist for significantly higher K than TFs. Numerical results supported the experimental results and showed that two reaction paths, CH 4 + OH -→ CH3 + H2O and CH3 + O → CO + H2 + H, were remarkably intensified by flame interaction of PPF near extinction; the significance of the reaction paths was determined. In addition, it was found that excess CO production plays an important role in extinction of PPFs.

Original languageEnglish
Pages (from-to)1075-1082
Number of pages8
JournalProceedings of the Combustion Institute
Volume32 I
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: 2008 Aug 32008 Aug 8

Keywords

  • Extinction
  • Flame stretch
  • Partially premixed flame
  • Premixed flame
  • Triple flame

ASJC Scopus subject areas

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

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