A computational study of unsteady laminar premixed methane/air flames with composition oscillations

Sotaro Miyamae, Bok Jik Lee, Hong G. Im, Toshihisa Ueda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effects of composition oscillations on the laminar premixed methane/air flames are investigated using computational simulations of unsteady one-dimensional counterflow flames. The code, OPUS, had been developed based on OPPDIF, solving an unsteady opposed-flow combustion configuration, including detailed chemical kinetics (GRI-mech 3.0) and transport model. The flame response to fuel concentration oscillation was numerically investigated for both lean and rich flame conditions. Methane/air mixtures with periodic equivalence ratio oscillations of 2-200 Hz were issued from the burner exit with 1.0 m/s uniform velocity profile. When the fuel concentration ratio was oscillated, the variation in flame temperature, flame location and the consumption speed did not follow those for the steady state condition and established a limit cycles. In the lean case, flame position oscillation made a clockwise limit cycle, while flame location made a counter-clockwise cycle in the rich case. In addition, flame temperature oscillation and consumption speed oscillation made counter-clockwise limit cycles in lean case, while flame temperature and consumption speed oscillation made clockwise cycles in the rich case. The behavior is attributed the effect of the heat transport from downstream burned gases, whose temperature oscillates in response to the imposed equivalence ratio oscillation. Furthermore, the limit cycles were significantly inclined at higher frequencies. The amplitude of the oscillation decreases with increasing frequency of the concentration oscillation at the Strouhal number larger than unity, suggesting that the unity Strouhal number serves as a reasonable criterion for the onset of unsteady flame response.

Original languageEnglish
Title of host publicationASPACC 2015 - 10th Asia-Pacific Conference on Combustion
PublisherCombustion Institute
Publication statusPublished - 2015
Event10th Asia-Pacific Conference on Combustion, ASPACC 2015 - Beijing, China
Duration: 2015 Jul 192015 Jul 22

Other

Other10th Asia-Pacific Conference on Combustion, ASPACC 2015
CountryChina
CityBeijing
Period15/7/1915/7/22

Fingerprint

Methane
flames
methane
Strouhal number
oscillations
air
Air
Chemical analysis
flame temperature
cycles
Temperature
Unsteady flow
Fuel burners
Reaction kinetics
Gases
equivalence
unity
counters
counterflow
unsteady flow

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

Miyamae, S., Lee, B. J., Im, H. G., & Ueda, T. (2015). A computational study of unsteady laminar premixed methane/air flames with composition oscillations. In ASPACC 2015 - 10th Asia-Pacific Conference on Combustion Combustion Institute.

A computational study of unsteady laminar premixed methane/air flames with composition oscillations. / Miyamae, Sotaro; Lee, Bok Jik; Im, Hong G.; Ueda, Toshihisa.

ASPACC 2015 - 10th Asia-Pacific Conference on Combustion. Combustion Institute, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Miyamae, S, Lee, BJ, Im, HG & Ueda, T 2015, A computational study of unsteady laminar premixed methane/air flames with composition oscillations. in ASPACC 2015 - 10th Asia-Pacific Conference on Combustion. Combustion Institute, 10th Asia-Pacific Conference on Combustion, ASPACC 2015, Beijing, China, 15/7/19.
Miyamae S, Lee BJ, Im HG, Ueda T. A computational study of unsteady laminar premixed methane/air flames with composition oscillations. In ASPACC 2015 - 10th Asia-Pacific Conference on Combustion. Combustion Institute. 2015
Miyamae, Sotaro ; Lee, Bok Jik ; Im, Hong G. ; Ueda, Toshihisa. / A computational study of unsteady laminar premixed methane/air flames with composition oscillations. ASPACC 2015 - 10th Asia-Pacific Conference on Combustion. Combustion Institute, 2015.
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