Characteristics of flame propagation at flame base region into premixed mixture with concentration gradient

Mitsutomo Hirota, Akiko Matsuo, Masahiko Mizomoto

Research output: Contribution to journalArticlepeer-review


Characteristics of a triple flame generated with methane-air mixture are experimentally investigated in various fuel concentration gradients. The OH radical intensity, which obtained by the direct measurement using an interference filter, and the flame position are measured in each case. The flame position shows that the whole flame width between the both premixed flame wings is wider than the flammability limit width of the unburned mixture. The expanding ratio of this flame width rises by increasing the concentration gradient. The result of OH radical intensity indicates that the most active reaction region is at flame base. The heat value supplied in the flammability limit well explains the behavior at the flame base region. It is also clarified that, at the flame base, the diffusion flame is formed away from the stoichiometric premixed flame, and these flames interact each other.

Original languageEnglish
Pages (from-to)1557-1564
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number646
Publication statusPublished - 2000 Jun


  • Combustion phenomena
  • Concentration gradient
  • Diffusion combustion
  • Flame interaction
  • OH radical
  • Premixed combustion
  • Triple flame

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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