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

Research output: Contribution to journal › Article

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
Externally published	Yes

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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Yoshiyama, S., Hamamoto, Y., Tomita, E., & Hozumi, Y. (1998). Fractal characteristics of turbulent premixed flames in an engine cylinder. Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, 64(626), 3479-3484. https://doi.org/10.1299/kikaib.64.3479

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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.",

keywords = "Combustion, Fractal, Laser aided diagnostics, Laser tomography, Premixed combustion, Premixed flame, Spark ignition engine, Turbulent flame",

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

year = "1998",

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doi = "10.1299/kikaib.64.3479",

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AU - Yoshiyama, Sadami

AU - Hamamoto, Yoshisuke

AU - Tomita, Eiji

AU - Hozumi, Yousuke

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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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