Cycle-resolved measurements of in-cylinder air velocity have been made in a motored engine (600-r/min engine speed, 10.6:1 compression) having a high-squish reentrant-bowl piston. The velocity fluctuations have been analyzed both by low-pass/high-pass frequency filtering and by evaluation of non-stationary velocity autocorrelation functions. These two complementary analyses and general issues pertaining to their interpretation are carefully examined. The results show the existence (and substantial squish-driven intensification) of demonstrably random fluctuations whose characteristic frequencies are sufficiently high to affect mixing and combustion within individual engine cycles. There is also evidence for lower-frequency fluctuations which are organized or deterministic to some extent within individual cycles but which are not repeatably phased from cycle to cycle.


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    Title :

    Cycle-Resolved Laser-Velocimetry Measurements in a Reentrant-Bowl-in-Piston Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1988



    Publication date :

    1988-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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