With a view to understanding the air-fuel mixing behavior and the effects of the mixture quality on the emissions formation and engine performance, a new quantitative factor of the in-cylinder air-fuel homogeneity named Homogeneity Factor (HF) has been developed. Its characteristics under various injection conditions and air swirl motions within the cylinder have been investigated with CFD simulation. The results have shown that air-fuel homogeneity is essentially affected by the spatial and temporal fuel distribution within the combustion chamber. Higher injection pressure, longer dwell time and increased pilot fuel quantities can contribute to better mixing quality resulting in increased HF and optimum engine performance with low fuel consumption and soot emissions. With regard to the in-cylinder air motion, increasing swirl ratio enhances the air-fuel mixing quality which has been reflected in the variation of the HF. As a result, increased in-cylinder pressure and temperature caused by the optimized air-fuel mixing improved the combustion efficiency.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Analysis of Diesel Engine In-Cylinder Air-Fuel Mixing with Homogeneity Factor: Combined Effects of Pilot Injection Strategies and Air Motion


    Additional title:

    Sae Int. J. Engines


    Contributors:
    Gao, Bo (author) / Peng, Jun (author) / Cheng, Li (author) / Wellers, Matthias (author) / Dimitriou, Pavlos (author) / Wang, Weiji (author)

    Published in:

    Publication date :

    2014-10-01


    Size :

    16 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Effects of advanced injection strategies on the in-cylinder air–fuel homogeneity of diesel engines

    Dimitriou, Pavlos / Peng, Zhijun / Wang, Weiji et al. | SAGE Publications | 2015



    Effects of advanced injection strategies on the in-cylinder air-fuel homogeneity of diesel engines

    Dimitriou,P. / Peng,Z. / Wang,W. et al. | Automotive engineering | 2015



    Pilot Injection Model for Small Diesel Cylinder

    Palmieri, Fulvio / Chiatti, Giancarlo | SAE Technical Papers | 2012