The characteristics of the early development of fuel sprays from pressure swirl atomizer injectors of the type used in direct injection gasoline engines is investigated. Planar laser-induced fluorescence (PLIF) was used to visualize the fuel distribution inside a firing optical engine.The early spray development of three different injectors at three different fuel pressures (3, 5, and 7 MPa) was followed as a function of time in 30 μsec intervals. Four phases could be identified: 1) A delay phase between the rising edge of the injection pulse and the first occurrence of fuel in the combustion chamber, 2) A solid jet or pre-spray phase, in which a poorly atomized stream of liquid fuel during the first 150 μsec of the injection. 3) A wide hollow cone phase, separation of the liquid jet into a hollow cone spray once sufficient tangential velocity has been established and 4) A fully developed spray, in which the spray cone angle is narrowed due to a low pressure zone at the center.The spray penetration, quality of atomization and the specific fuel distribution during the duration of injection (about 2 ms or 12 CAD) are functions of fuel delivery pressure as well as ambient pressure. The experiments are intended for future comparison with computational results, as well as for guidance in the the design of GDI combustion systems.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Early Spray Development in Gasoline Direct-Injected Spark Ignition Engines


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Congress & Exposition ; 1998



    Publication date :

    1998-02-23




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Early spray development in gasoline direct-injected spark ignition engines

    Shelby,M.H. / VanDerWege,B.A. / Hochgreb,S. et al. | Automotive engineering | 1998


    Spark Ignition System for Direct-Injected Gasoline Two Stroke Engine

    French, Michael J. | SAE Technical Papers | 2012




    Predicting the particulate matter emissions from spray-guided gasoline direct-injection spark ignition engines

    Leach, Felix / Stone, Richard / Fennell, Derek et al. | SAGE Publications | 2017