Experimental and theoretical study on splitting flames in a circular micro tube

Ai Wu Fan, Minaev Sergey, Maruta Kaoru, Hao Lin Yang, Wei Liu

Research output: Contribution to journalArticle

Abstract

Premixed combustion of propane/air mixture was experimentally and theoretically investigated in a heated micro tube of 2.0 mm inner diameter. Splitting flames were observed with an image-intensified high-speed digital video camera. After auto-ignition of the mixture, the reaction front splits into an ordinary flame and a weak flame. The former propagates upstream whereas the latter moves downstream and finally they both extinguish. After some delay, re-ignition of fuel-air mixture occurs and flame splitting process repeats. This phenomenon was identified in rich, stoichiometric and lean mixtures. It was reproduced by a thermo-diffusive model with global one-step chemistry. The computation results demonstrate that the ordinary flame is quenched by heat loss to the cold wall in the upstream region, while the weak flame is extinguished by consumption of fuel in the downstream region.

Original languageEnglish
Pages (from-to)1781-1784
Number of pages4
JournalKung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
Volume32
Issue number10
Publication statusPublished - 2011 Oct 1

Keywords

  • Flame instability
  • Splitting flame
  • Weak flame
  • Words micro combustion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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