The Temporal Rate of Fractal Dimension Growth in Flame Front Wrinkles during the Early Phase of Flame Propagation in an SI Engine

Turbulent premixed flame fronts during the early phase of flame propagation were visualized by a laser-light sheet technique in an optically accessible spark ignition engine. Time-resolved continuous images of wrinkling flame fronts were captured by a high-speed video camera. The test engine was ope...

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Bibliographic Details
Published inNihon Kikai Gakkai rombunshuu. B hen Vol. 70; no. 689; pp. 244 - 251
Main Authors SUZUKI, Kunihiko, NISHIWAKI, Kazuie
Format Journal Article
LanguageJapanese
English
Published The Japan Society of Mechanical Engineers 2004
Subjects
Flame
Fractal Dimension
Internal Combustion Engine
Premixed Combustion
SI Engine
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Summary:Turbulent premixed flame fronts during the early phase of flame propagation were visualized by a laser-light sheet technique in an optically accessible spark ignition engine. Time-resolved continuous images of wrinkling flame fronts were captured by a high-speed video camera. The test engine was operated at various engine speeds and compression ratios. The image data were processed to measure the fractal dimension in a time series for each cycle and to investigate the nature of fractal dimension growth in the early phase of flame development. The results show that the temporal rate of fractal dimension growth increases as the engine speed and the compression ratio increase. The empirical correlation was derived for the temporal rate of fractal dimension growth as a function of turbulence intensity and pressure.
ISSN:0387-5016
1884-8346
DOI:10.1299/kikaib.70.244