Detailed experimental information on the early stages of spark ignition process represent a substantial part for guiding the development of engines with higher efficiencies and reduced pollutant emissions. Flame kernel formation influences strongly combustion development inside the cylinder, especially for a direct injection spark ignition engine. This study presents the analysis of the evolution of spark-ignited flame kernels with detailed view upon cycle-to-cycle variations. Experiments are performed in a SI optical engine equipped with the cylinder head and injection system of a commercial turbocharged engine. Blend of commercial gasoline and butanol (40% by volume) is tested at stoichiometric and lean mixture conditions.Experiments are carried out at 2000 rpm through conventional tests (based on in-cylinder pressure measurements and exhaust emission analysis) and through optical diagnostics. In particular, UV-visible digital imaging and natural emission spectroscopy are applied. A post-detection procedure is used to evaluate flame kernel areas evolution and its correlation to the MFB. UV-visible natural emission spectroscopy is applied to investigate the formation and the evolution of the main compounds characterizing the spark ignition and combustion process.


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    Title :

    UV-visible Optical Characterization of the Early Combustion Stage in a DISI Engine Fuelled with Butanol-Gasoline Blend


    Additional title:

    Sae Int. J. Engines



    Conference:

    SAE/KSAE 2013 International Powertrains, Fuels & Lubricants Meeting ; 2013


    Published in:

    Publication date :

    2013-10-14


    Size :

    17 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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