The transient behaviour of the fuel spray from an air assisted fuel injector has been investigated both numerically and experimentally in a Constant Volume Chamber (CVC) and an optical engine. This two phase injector is difficult to analyse numerically and experimentally because of the strong coupling between the gas and liquid phases. The gas driven atomization of liquid fuel involves liquid film formation, separation and break up and also liquid droplet coalescence, break up, splashing, bouncing, evaporation and collision. Furthermore, the liquid phase is the dominant phase in many regions within the injector.Experimental results are obtained by using Mie scattering, Laser Induced Fluorescence (LIF) and Laser Sheet Drop sizing (LSD) techniques. Computational results are obtained by using a mixed Lagrangian/Eulerian approach in a commercial Computational Fluid Dynamic (CFD) code. Injector rig results show a good atomization of the spray with low spray width and penetration and Sauter Mean Diameters (SMD) of droplets of order 10 µm. Engine results show a spray with a relatively low penetration producing liquid fuel and vapour fuel concentrations close to the central location of the injector and spark plug for stratified, lean mode of operation. Imaging of this injector operating inside an engine confirms the overall design approach for stratified operation.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Experimental and Numerical Study of an Air Assisted Fuel Injector for a D.I.S.I. Engine


    Additional title:

    Sae Technical Papers


    Contributors:
    Boretti, A. A. (author) / Zakis, G. (author) / Carlisle, H. (author) / Watson, H. (author) / Brear, M. J. (author) / Jin, S. H. (author) / Attard, W. (author) / Bryce, W. (author)

    Conference:

    SAE World Congress & Exhibition ; 2007



    Publication date :

    2007-04-16




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Experimental and Numerical Study of an Air Assisted Fuel Injector for a D.I.S.I. Engine

    Boretti, A. A. / Jin, S. H. / Zakis, G. et al. | British Library Conference Proceedings | 2007


    Experimental and numerical study of an air assisted fuel injector for a DISI engine

    Boretti,A.A. / Jin,S.H. / Zakis,G. et al. | Automotive engineering | 2007


    2007-01-1415 Experimental and Numerical Study of an Air Assisted Fuel Injector for a D.I.S.I. Engine

    Boretti, A. A. / Jin, S. H. / Zakis, G. et al. | British Library Conference Proceedings | 2007


    An experimental study of the spray from an air-assisted direct fuel injector

    Jin, S H / Brear, M / Watson, H et al. | SAGE Publications | 2008