Extinction characteristics of CH4/CO2 versus O 2/CO2 counterflow non-premixed flames at elevated pressures up to 0.7 MPa

Kaoru Maruta, Kazuki Abe, Susumu Hasegawa, Shigenao Maruyama, Ju N.Ichi Sato

Research output: Contribution to journalConference articlepeer-review

46 Citations (Scopus)

Abstract

Extinction characteristics of counterflow radiating non-premixed CH 4/CO2 versus O2/CO2 flames at elevated pressures up to 0.7 MPa were studied both experimentally and computationally. Conventional C-shape extinction curves due to the upstream conduction loss at lower stretch rate were observed at 0.1 and 0.2 MPa. However, at 0.5 and 0.7 MPa, fuel-lean extinction limits were monotonously broadened with the decrease of stretch rate at lower stretch rate region while CH 4/N2 versus O2/N2 flames showed conventional C-shaped extinction behavior at the same condition. Interpretation of these experimental extinction characteristics was made with one-dimensional computations using optically thin and statistical narrow-band radiation models. The computational results implies the observed phenomena can be attributed to the radiation reabsorption which plays a significant role at high pressure conditions.

Original languageEnglish
Pages (from-to)1223-1230
Number of pages8
JournalProceedings of the Combustion Institute
Volume31 I
Issue number1
DOIs
Publication statusPublished - 2007
Event31st International Symposium on Combustion - Heidelberg, Germany
Duration: 2006 Aug 52006 Aug 11

Keywords

  • Counterflow non-premixed flames
  • Extinction
  • Oxygen combustion
  • Radiative extinction
  • Statistical narrow-band model

ASJC Scopus subject areas

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

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