This paper examines HCCI operation in a four-stroke, single cylinder engine with a four-valve, pentroof-type, Honda VTEC cylinder head, with and without axial charge stratification. Axial charge stratification was achieved by injecting the fuel either against closed-valves (leading to a weakly axial stratified charge) and against open valves (leading to a strongly axial stratified charge). A/F ratio variations owing to injection timing were quantified using the infrared absorption technique and a good agreement with Hardalupas et al. (1995) was shown. From the results obtained, it was concluded that: with closed-valve injection timing, higher maximum peak pressure and IMEP than with open-valve injection timing were achieved; greater variability in the minimum pressure and IMEP was observed with open-valve injection timing compared to closed-valve injection timing; with open-valve injection timing, HCCI combustion timing was retarded and HCCI combustion duration was increased compared to closed-valve injection timing. Natural light images acquired using the KODAK HS 4540 fast camera showed that with closed-valve injection timing, auto-ignition starting under the primary intake valve near the cylinder wall, while with open-valve injection timing, auto-ignition started between the exhaust-valve and the secondare intake valve, closer to the centre of the piston. The 'apparent' auto-ignition front speed between the two injection timing strategies and was calculated to be 73 +/- 8 m/s with an indication of a lower speed in the case of axial charge stratification. The possibility of controlling HCCI combustion with charge stratification in the engine was shown but further investigation is needed. Internal EGR can be used to create a more profound axial or radial charge and temperature stratification. These experiments can provide a better understanding in the principles of HCCI combustion and in the development of the auto-ignition front. Measurements of the auto-ignition front development would also provide a useful tool to modellers in their development of accurate multi-zone model for prediction of HCCI combustion and emissions.


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    Titel :

    Axial fuel stratification of a homogeneous charge compression ignition (HCCI) engine


    Weitere Titelangaben:

    Axiale Kraftstoffschichtung eines HCCI-Motors


    Beteiligte:
    Aleiferis, P.G. (Autor:in) / Charalambides, A.G. (Autor:in) / Hardalupas, Y. (Autor:in) / Taylor, A.M.K.P. (Autor:in) / Urata, Y. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2007


    Format / Umfang :

    21 Seiten, 12 Bilder, 1 Tabelle, 28 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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