Fractal characteristics of turbulent premixed flames in an engine cylinder

Sadami Yoshiyama, Yoshisuke Hamamoto, Eiji Tomita, Yousuke Hozumi

Research output: Contribution to journalArticlepeer-review


The cross-sectional images of turbulent premixed flames of homogeneous fuel-air mixture in an engine cylinder were obtained by a laser tomography, and the fractal characteristics were investigated. It was observed that in an engine cylinder under high pressure condition, the turbulent flame was a smaller and more complicated structure, comparing with that under the lower pressure condition in a closed combustion chamber. The fractal dimension increases with the increase of the turbulence intensity and mixture density. The fractal dimension is expressed as a function of the increase ratio of mixture density and the ratio of turbulence intensity to laminar burning velocity. The inner cutoff scale of turbulent flames is expressed as a function of Karlovitz number.

Original languageEnglish
Pages (from-to)3479-3484
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number626
Publication statusPublished - Oct 1998


  • Combustion
  • Fractal
  • Laser aided diagnostics
  • Laser tomography
  • Premixed combustion
  • Premixed flame
  • Spark ignition engine
  • Turbulent flame

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering


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