A spray model for pressure-swirl atomizers that is based on a linearized instability analysis of liquid sheets has been combined with an ignition and combustion model for stratified charge spark ignition engines. The ignition model has been advanced, such that the presence of dual spark plugs can now be accounted for.Independent validation of the spray model is achieved by investigating a pressure-swirl injector inside a pressure bomb containing air at ambient temperature. In a second step, the complete model is used to estimate the performance of a small marine DISI Two-Stroke engine operating in stratified charge mode. Simulation results and experimental data are compared for several different injection timings and the agreement is generally good such that there is confidence in the predictive quality of the combustion model.Finally the model is applied in a conceptual study to investigate possible benefits of split injections. The simulation results suggest that both fuel economy and NOx-emissions can be improved when a two-pulse injection is used such that the late injected, stratified fuel ensures stable ignition at the spark plug whereas the early injected, diluted fuel reduces the maximum combustion temperature and controls NOx-formation.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Modeling the Effect of Split Injections on DISI Engine Performance


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2001 World Congress ; 2001



    Publication date :

    2001-03-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Modeling the effect of split injections on DISI engine performance

    Stiesch,G. / Merker,G.P. / Tan,Z. et al. | Automotive engineering | 2001


    Split injections in a spray-guided DISI engine under the lean-stratified operation

    Oh,H. / Bae,C. / Korea Advanced Inst.of Science a.Technol.,KAIST,KR | Automotive engineering | 2012


    Reducing Deposits in a DISI Engine

    Katers, Dagmar / Mackney, Derek W. / Walter, Dieter et al. | SAE Technical Papers | 2002


    Reducing deposits in a DISI engine

    Woelfle,M. / Walter,D. / Katers,D. et al. | Automotive engineering | 2002


    Reducing deposits in a DISI engine

    Mackney,D.W. / Calder,R.M. / Macduff,M.G. et al. | Automotive engineering | 2002