Dimensional Effects of Nozzle-Type Burner on Flow Fields and Extinction of Counterflow Twin Flames

Hideaki Kobayashi, Michio Kitano, Eisaku Mori

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The flow fields of a counterflow nozzle burner and counterflow twin flames for propane-air mixture stabilized with that burner were measured using LDV. The effects of the burner dimension, i.e., the outlet diameter of two opposed contraction nozzles and the distance between them, on the velocity profiles and extinction limits of the twin flames were examined. Results show that the effects of burner dimension on the extinction limit do not appear when the velocity gradient upstream of the front edge of preheating zone is used as a flow parameter and that the ratio of nozzle distance to nozzle outlet diameter is the main factor determining the dimensional effects on the flow characteristics. It is also shown that the flame stretch rate of the twin flames defined at the stagnation plane is about two times as large as that defined at the cold boundary of the flame.

Original languageEnglish
Pages (from-to)1141-1146
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number535
Publication statusPublished - 1991


  • Extinction
  • Flame
  • Flame Stretch
  • Flow Field
  • Nozzle Burner Dimensional Effect
  • Premixed Combustion
  • Twin Flames


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