The paper is concerned with end-gas autoignition, subsequent knock severity and magnitude of induced gas velocity. An optically accessed single cylinder Yamaha two stroke engine was modified to give complete overhead optical access to the disc-shaped combustion chamber. Flame propagation and end-gas autoignition events were recorded using high speed natural light and schlieren photography; local gas motions, prior to and induced by the knock event, were determined using an oil droplet trajectory technique. Cylinder pressure was synchronously recorded at three positions around the cylinder head; one transducer's output being simultaneously displayed on the film.End gas autoignition generally developed from multiple centres. Autoignition was usually, but not invariably, followed by knock. The severity of knock increased as the onset of autoignition occurred closer behind the top dead centre position; knock was characterized by pressure oscillations, carbon formation and high velocity post-knock gas motions. These phenomena were relatively insensitive to mass fraction unburned at the time of autoignition.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    End Gas Autoignition and Knock in a Spark Ignition Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1990



    Publication date :

    1990-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Modeling autoignition and engine knock under spark ignition conditions

    Eckert,P. / Kong,S.C. / Reitz,R.D. et al. | Automotive engineering | 2003


    Modeling Autoignition and Engine Knock Under Spark Ignition Conditions

    Eckert, Peter / Reitz, Rolf D. / Kong, Song-Charng | SAE Technical Papers | 2003


    End gas autoignition and knock in a spark ignition engine

    Koenig,G. / Sheppard,C.G. / Daimler-Benz,Stuttgart,DE et al. | Automotive engineering | 1990


    The simulation of autoignition and knock in a spark ignition engine with disk geometry

    Blunsdon,C.A. / Dent,J.C. / Loughborough Univ.of Technology,GB | Automotive engineering | 1994


    The Simulation of Autoignition and Knock in a Spark Ignition Engine with Disk Geometry

    Blunsdon, C. A. / Dent, J.C. | SAE Technical Papers | 1994