Reactivity Controlled Compression Ignition (RCCI) is an engine combustion strategy that produces low NO and PM emissions with high thermal efficiency. Previous RCCI research has been investigated in single-cylinder heavy-duty engines. The current study investigates RCCI operation in a light-duty multi-cylinder engine at 3 operating points. These operating points were chosen to cover a range of conditions seen in the US EPA light-duty FTP test. The operating points were chosen by the Ad Hoc working group to simulate operation in the FTP test. The fueling strategy for the engine experiments consisted of in-cylinder fuel blending using port fuel-injection (PFI) of gasoline and early-cycle, direct-injection (DI) of diesel fuel. At these 3 points, the stock engine configuration is compared to operation with both the original equipment manufacturer (OEM) and custom-machined pistons designed for RCCI operation. The pistons were designed with assistance from the KIVA 3V computational fluid dynamics (CFD) code. By using a genetic algorithm optimization, in conjunction with KIVA, the piston bowl profile was optimized for dedicated RCCI operation to reduce unburned fuel emissions and piston bowl surface area. By reducing these parameters, the thermal efficiency of the engine was improved while maintaining low NO and PM emissions. Results show that with the new piston bowl profile and an optimized injection schedule, RCCI brake thermal efficiency was increased from 37%, with the stock EURO IV configuration, to 40% at the 2,600 rev/min, 6.9 bar BMEP condition, and NO and PM emissions targets were met without the need for exhaust aftertreatment.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Piston Bowl Optimization for RCCI Combustion in a Light-Duty Multi-Cylinder Engine


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Splitter, Derek (Autor:in) / Hanson, Reed (Autor:in) / Wagner, Robert (Autor:in) / Reitz, Rolf D. (Autor:in) / Kokjohn, Sage (Autor:in) / Curran, Scott (Autor:in)

    Kongress:

    SAE 2012 World Congress & Exhibition ; 2012


    Erschienen in:

    Erscheinungsdatum :

    16.04.2012


    Format / Umfang :

    14 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Piston Bowl Optimization for RCCI Combustion in a Light-Duty Multi-Cylinder Engine

    Hanson, R. / Curran, S. / Wagner, R. et al. | British Library Conference Proceedings | 2012


    Piston bowl optimization of RCCI combustion in a light-duty multi-cylinder engine

    Hanson,R. / Curran,S. / Wagner,R. et al. | Kraftfahrwesen | 2012


    Transient RCCI Operation in a Light-Duty Multi-Cylinder Engine

    Hanson, R. / Reitz, R. / Society of Automotive Engineers | British Library Conference Proceedings | 2013


    Transient RCCI Operation in a Light-Duty Multi-Cylinder Engine

    Hanson, Reed / Reitz, Rolf D. | SAE Technical Papers | 2013


    Effects of Biofuel Blends on RCCI Combustion in a Light-Duty, Multi-Cylinder Diesel Engine

    Hanson, R. / Curran, S. / Wagner, R. et al. | British Library Conference Proceedings | 2013