The octane requirement increase (ORI) observed in spark ignition engines essentially occurs due to the effect of deposits in the combustion chamber changing the heat transfer characteristics between the end-gas and the combustion chamber walls. In addition, the volume occupied by deposits produces a change in compression ratio inside each cylinder which also contributes to ORI. However, all the ORI observed in spark ignition engines cannot be explained by these physical effects alone and for some time the existence of a chemical mechanism of ORI has been postulated. Evidence is presented from a laboratory experiment which demonstrates that deposits are indeed able to influence the ignition delay times of fuel-air mixtures by providing a source of active species which help initiate autoignition. Such effects have also been observed in some engine experiments, thus confirming the existence of chemically based ORI.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Some Evidence for Chemical Effects on Octane Requirement Increase from Deposits in Spark Ignition Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Morley, C. (Autor:in) / Beck, C. M. (Autor:in) / Price, R. J. (Autor:in)

    Kongress:

    International Spring Fuels & Lubricants Meeting & Exposition ; 1997



    Erscheinungsdatum :

    1997-05-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    The Effect of Combustion Chamber Deposits on Octane Requirement Increase in a Spark Ignition Engine

    Jung, H. S. / Whang, J. T. / Kim, S. H. et al. | SAE Technical Papers | 2008


    The Effect of Combustion Chamber Deposits on Octane Requirement Increase in a Spark Ignition Engine

    Jung, H.S. / Kim, S.H. / Lee, S.M. et al. | British Library Conference Proceedings | 2008



    A Detonation Model in Spark-Ignition Engines: Preliminary Results on Engine Octane Requirement

    Danieli, Guido A. / Amelio, Mario / Belli, Mario et al. | SAE Technical Papers | 1984


    Gasoline Effects on Octane Requirement Increase and Combustion Chamber Deposits

    Furman, Jefrey B. / Megnin, Martin K. | SAE Technical Papers | 1992