Tests on a single-cylinder engine have shown that the flame speed and lean extinction limir may be increased by the fitment of a “vortex generator” in the engine intake. This consists of a nest of delta wings which generates a vortex system in the inlet air flow. The results show that this vortex generator should be of variable geometry and replace the conventional throttle.The main instrumentation on the engine consists of a flame logger which accepts amplified signals from ionisation probes set in the engine combustion chamber. The logger is gated to count those flames which travel across the combustion chamber during a set crank angle period. Information from this instrumentation is presented in the form of graphs describing the effect of vortex generator blockage ratio, mixture strength, engine speed, load and spark timing upon the percentage number of flames which cross the chamber and apparent flame speed.


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    Title :

    Lean Mixture Running of the Spark Ignition Engine by the Generation of a Vortex System within the Intake


    Additional title:

    Sae Technical Papers


    Contributors:
    Lucas, G. G. (author) / Brunt, M. (author) / Petrovic, S. (author)

    Conference:

    1978 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1978



    Publication date :

    1978-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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