Effects of oxidizer preheating and dilution on the extinction and structure of CH4-O2-Ar counterflowing diffusion flames

Masao Takeuchi, Kunihito Hamatsu, Yuji Yahagi, Shingo Nakahara

Research output: Contribution to conferencePaperpeer-review


The effects of oxidizer preheating and dilution levels of fuel and oxygen by inert gas on the extinction and structure of counterflow CH4-O2-Ar diffusion flame were studied experimentally and numerically. The OPPDIF code and the GRI-Mech 2.11 database were used for the calculation. The experimental results agreed well with the numerical calculation results. The detailed measurement and calculation of the flame structure revealed that a flame location was in the oxidizer flow side at smaller stoichiometric mixture fraction (Fst). The region of Fst from 0.2 to 0.6 approximately corresponded to the transition region. In this region, the extinction limit depended on the oxidizer and fuel side conditions. The flame location was quite important factor to understand the effects of dilution levels and oxidizer preheating on the extinction phenomena and of the present study.

Original languageEnglish
Number of pages1
Publication statusPublished - 2002 Dec 1
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: 2002 Jul 212002 Jul 26


Conference29th International Symposium on Combustion

ASJC Scopus subject areas

  • Engineering(all)


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