Valve deactivation followed by multiple compression-expansion strokes was employed to remove intake-generated turbulence from the bulk gas in an internal combustion engine. The result was a nearly quiescent flowfield that retains the same time-varying geometry and, to a first approximation, thermodynamic conditions as a standard engine. Mass loss, and more significantly heat loss were found to contribute to a reduction in the peak cylinder pressure in the cycle following two compression-expansion strokes. The reduction of the turbulence was verified both computationally and by performing premixed combustion studies.Mixing studies of both liquid spray jets and gaseous jets were performed. Laser-induced fluorescence images of high spatial resolution and signal-to-noise ratio were acquired, allowing the calculation of the two in-plane components of the scalar dissipation rate. The effect of in-cylinder vaporization was found to be relatively small, but with valve-deactivated operation the effect of vaporization was found to be more significant due to the decrease in bulk gas temperature. There was a very significant decrease in the level of homogeneity of gas jets into a quiescent valve-deactivated engine flow as compared to the same gas jet into a standard in-cylinder case, which leads to the major finding of this study: the bulk in-cylinder flowfield has a controlling effect on the mixing of gasoline direct-injection spray jets.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Bulk Cylinder Flowfield Effects on Mixing in DISI Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Probst, D. M. (Autor:in) / Ghandhi, J. B. (Autor:in) / Wiles, M. A. (Autor:in)

    Kongress:

    SAE 2005 World Congress & Exhibition ; 2005



    Erscheinungsdatum :

    11.04.2005




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Bulk cylinder flow field effects on mixing in DISI engines

    Wiles,M.A. / Probst,D.M. / Ghandhi,J.B. et al. | Kraftfahrwesen | 2005


    NVH ASPECTS OF DISI-ENGINES

    Brohmer, A. / Joerres, M. / Schafer, E. et al. | British Library Conference Proceedings | 2001


    NVH aspects of DISI-engines

    Brohmer,A. / Joerres,M. / Schaefer,E. et al. | Kraftfahrwesen | 2001


    Future fuels for modern DISI engines

    Thewes,M. / Kuepper,C. / Rezaei,R. et al. | Kraftfahrwesen | 2010


    Effects of Mixture homogeneity to DISI Engines on knock characteristics

    Yoshimura, H. / Yoshimatsu, A. / Abe, K. et al. | British Library Conference Proceedings | 2005