The present contribution predicts the onset of knock and associated performance of a spark ignition engine fuelled with gaseous fuels such as methane. A two-zone predictive combustion model was developed based on an estimate of the effective duration of the combustion period and the mass burning rate for any set of operating conditions. The unburned end gas preignition chemical reaction activity is described by a detailed chemical reaction kinetic scheme. The variation with time of the value of a formulated dimensionless knockparameter K is calculated. This parameter relates the total energy released within the end gas due to autoignition reaction activity per unit of the corresponding instanteneous volume relative to the total energy release per cylinder volume that would take place normally due to regular flame propagation. When knocking is encountered the value of K builds up to a sufficiently high value that exceeds an acceptable limit. Under normal operating conditions, the value remains throughout the combustion period at comparatively low levels. Extension of the model to consider fuel mixtures and provide optimum procedures for getting out of a knocking conditions are also outlined.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A predictive approach to spark ignition engine performance fuelled with common gaseous fuels and their mixtures


    Additional title:

    Prädikative Betrachtung über die Leistung von Ottomotoren, die mit gängigen gasförmigen Kraftstoffen und ihren Gemischen betrieben werden


    Contributors:
    Karim, G.A. (author) / Gao, J. (author) / Attar, A.A. (author)


    Publication date :

    1995


    Size :

    6 Seiten, 6 Bilder, 15 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Some considerations of cyclic variations in spark ignition engines fuelled with gaseous fuels

    Al-Alousi,Y.H. / Karim,G.A. / Univ of Bagdad,IQ et al. | Automotive engineering | 1984


    An experimental investigation of spark ignition engine operation on gaseous fuels lean mixtures

    Li,H. / Karim,G.A. / National Research Council Canada,CA et al. | Automotive engineering | 2005


    Experimental study on a spark ignition engine fuelled by methane-hydrogen mixtures

    Akansu, S.Orhan / Kahraman, Nafiz / Ceper, Bilge | Tema Archive | 2007


    Performance and emissions improvement of an spark ignition engine fuelled by LPG/gasoline mixtures

    Pipitone,E. / Beccari,S. / Univ.di Palermo,IT | Automotive engineering | 2010