Response of stoichiometric and rich premixed methane-air flames to unsteady strain rate and curvature

Habib N. Najm*, Omar Knio, Phillip H. Paul, Peter S. Wyckoff

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The interaction of a premixed methane-air flame with a two-dimensional counter-rotating vortex pair is studied under stoichiometric and rich conditions using a detailed C1C2 chemical mechanism. The flame structure and transient response are examined, both at curved cusps and on the vortex-pair centreline. Differences between the two flames are observed in the unsteady behaviour of species mole fractions and production rates. In contrast with earlier one-dimensional opposed-jet flame data, the present results show that the rich flame exhibits a faster response to unsteady strain-rate disturbances than does the stoichiometric flame. Analysis of the results suggest this may be due to the increased dependence of the flame on H, and the decreased role of OH, under rich conditions. Results are also presented from an experimental V-flame vortex-pair interaction study. Measured peak CH and OH data are also found to exhibit a faster flame response under rich conditions.

Original languageEnglish (US)
Pages (from-to)709-726
Number of pages18
JournalCombustion Theory and Modelling
Volume3
Issue number4
DOIs
StatePublished - Dec 1 1999

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Modeling and Simulation
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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