Fractal characteristics of turbulent premixed flames in an engine cylinder

Sadami Yoshiyama; Yoshisuke Hamamoto; Eiji Tomita; Yousuke Hozumi

doi:10.1299/kikaib.64.3479

Fractal characteristics of turbulent premixed flames in an engine cylinder

Sadami Yoshiyama, Yoshisuke Hamamoto, Eiji Tomita, Yousuke Hozumi

Graduate School of Natural Science and Technology

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English
Pages (from-to)	3479-3484
Number of pages	6
Journal	Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume	64
Issue number	626
DOIs	https://doi.org/10.1299/kikaib.64.3479
Publication status	Published - Oct 1998

Keywords

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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title = "Fractal characteristics of turbulent premixed flames in an engine cylinder",

abstract = "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.",

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author = "Sadami Yoshiyama and Yoshisuke Hamamoto and Eiji Tomita and Yousuke Hozumi",

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AU - Yoshiyama, Sadami

AU - Hamamoto, Yoshisuke

AU - Tomita, Eiji

AU - Hozumi, Yousuke

PY - 1998/10

Y1 - 1998/10

N2 - 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.

AB - 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.

KW - Combustion

KW - Fractal

KW - Laser aided diagnostics

KW - Laser tomography

KW - Premixed combustion

KW - Premixed flame

KW - Spark ignition engine

KW - Turbulent flame

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