Experimental (optical imaging) and CFD investigations of the cavitating flow in a transparent large-scale model of a GDi outward-opening injector, with a swirler-type valve-group, has been performed. The objective is to elucidate the flow structure within the valve group and assess a Reynolds-Averaged Navier-Stokes (RANS) multi-fluid simulation method.The optical imaging data show evidence of cavitation inception in the valve-group swirler-channels-caused by the rapid flow acceleration-and multiple cavitations within the conical nozzle region.The comparison of simulations with data shows that the CFD method reproduces the fluid dynamics of the valve-group with good qualitative agreement with the imaging data (with respect to the cavitation inception and geometry) and excellent quantitative agreement of the valve-group pressure drop-flow rate characteristic. In addition, the simulations reveal that the apparent cavitation in the conical nozzle region involves a “partial hydraulic flip” phenomena and entrainment of the ambient air.


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    Title :

    Cavitation and Hydraulic Flip in the Outward-Opening GDi Injector Valve-Group


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE World Congress & Exhibition ; 2009



    Publication date :

    2009-04-20




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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