Air velocities at several points near the spark plug location were measured using a laser Doppler anemometer (LDA) in a motoring internal combustion engine. This engine was equipped with three intake configurations: a standard valve in a standard port, a standard valve in a helical (swirl) port, and a shrouded valve in a standard port. Both ensemble-averaged and cycle-resolved mean velocities were determined; this allows comparison of rms velocity fluctuation, cycle-resolved turbulence, and cycle-by-cycle variations in mean velocity. Frequency domain analysis of these components was also carried out. The main conclusion of this experimental study was that starting from a very low swirl situation (standard valve case), addition of a moderate amount of swirl (swirl port case) goes a long way towards improving cycle repeatability and increasing cycle-resolved turbulence. Increasing swirl even further (shrouded valve case) does not produce further dramatic improvements.


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    Title :

    Influence of Inlet Flows on the Flow Field in an Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1987



    Publication date :

    1987-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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