The performance of multi-hole injectors designed for use in second-generation direct-injection gasoline engines has been characterised in a constant-volume chamber. Two types of multi-hole injector have been used: the first has 11 holes, with one hole on the axis of the injector and the rest around the axis at 30 degrees apart, and the second has 6 asymmetric holes located around the nozzle axis. Measurements of droplet axial and radial velocity components and their diameter were obtained using a 2-D phase Doppler anemometer (PDA) at injection pressures up to 120 bar, chamber pressures from atmospheric to 8 bar, and ambient temperatures. Complementary spray visualisation made use of a pulsed light and a CCD camera synchronised with the injection process.Comparison of the results between the two injectors has allowed quantification of the influence of the number of holes and nozzle length-to-diameter ratio on the spray structure and spray tip penetration, droplet velocity and size distribution as a function of injection and chamber pressures of relevance to gasoline passenger cars.


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    Titel :

    Spray Structure Generated by Multi-Hole Injectors for Gasoline Direct-Injection Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Arcoumanis, C. (Autor:in) / Nouri, J. M. (Autor:in) / Gavaises, M. (Autor:in) / Mitroglou, N. (Autor:in) / Yan, Y. (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2007



    Erscheinungsdatum :

    16.04.2007




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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