The ability of certain induction systems to enhance turbulence levels at the time of ignition, through formation of long-lived tumbling vortices on the plane of the valve and cylinder axes, has been investigated in a two-valve spark-ignition engine by rotating the intake port at 90° and 45° to the orientation of production directed ports. Detailed measurements of the three velocity components, obtained by laser velocimetry, revealed that the 90° port generated a pure tumble motion, with a maximum tumbling vortex ratio of 1.5 at 295°CA, zero swirl, and 42% turbulence enhancement relative to the standard configuration, while the 45° port gave rise to a combined tumble/swirl structure with a maximum tumbling vortex ratio of 0.5 at 285°CA, swirl ratio of 1.0 at TDC, and turbulence enhancement of 24%. The implications of the two types of flow structures for combustion are discussed.


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    Titel :

    Tumbling Motion: A Mechanism for Turbulence Enhancement in Spark-Ignition Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Arcoumanis, C. (Autor:in) / Vafidis, C. (Autor:in) / Whitelaw, J. H. (Autor:in) / Hu, Z. (Autor:in)

    Kongress:

    International Congress & Exposition ; 1990



    Erscheinungsdatum :

    1990-02-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Tumbling motion:A mechanism for turbulence enhancement in spark-ignition engines

    Arcoumanis,C. / Hu,Z. / Vafidis,C. et al. | Kraftfahrwesen | 1990


    Spark ignition engines

    Maehlner, E. | Engineering Index Backfile | 1943




    An investigation of in-cylinder tumbling motion in a four-valve spark ignition engine

    Li, Y / Liu, S / Shi, S-X et al. | SAGE Publications | 2001