The ignition and flame stabilization characteristics of two synthetic fuels, having significantly different cetane numbers, are investigated in a constant volume combustion vessel over a range of ambient conditions representative of a compression ignition engine operating at variable loads. The synthetic fuel with a cetane number of 63 (S-1) is characterized by ignition delays that are only moderately longer than n-dodecane (cetane number of 87) over a range of ambient conditions. By comparison, the synthetic fuel with a cetane number of 17 (S-2) requires temperatures approximately 300 K higher to achieve the same ignition delays. The much different ignition characteristics and operating temperature range present a scenario where the lift-off stabilization may be substantially different. At temperatures below 1000 K, the S-2 fuel undergoes a long transient stabilization phase during which the lift-off location moves as much as 15 mm upstream (i.e., toward the injector orifice) after the ignition of the first flame kernel. This behavior is much different than S-1, n-dodecane, or with conventional diesel, in which past research shows that the lift-off location stabilizes very close to the ignition location shortly after the premixed burn. The longer ignition delays for S-2 frequently result in fuel-lean mixtures at the ignition location where the spray becomes over-mixed (i.e., too fuel-lean) and the high-temperature ignition event is noticeably less robust (i.e., smaller and less intense ignition kernels) as observed by high-speed chemiluminescence imaging. High-speed chemiluminescence imaging and pressure measurements show strong evidence of cool-flame (i.e., first-stage or low-temperature) reactions prior to high-temperature ignition for S-1 while they are less evident for S-2.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Ignition Quality Effects on Lift-Off Stabilization of Synthetic Fuels


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Lequien, Guillaume (Autor:in) / Manin, Julien (Autor:in) / Pickett, Lyle M (Autor:in) / Andersson, Oivind (Autor:in) / Skeen, Scott (Autor:in)

    Kongress:

    SAE 2015 World Congress & Exhibition ; 2015


    Erschienen in:

    Erscheinungsdatum :

    14.04.2015


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Ignition quality effects on lift-off stabilization of synthetic fuels

    Lequien,G. / Skeen,S. / Manin,J. et al. | Kraftfahrwesen | 2015


    Ignition Quality Effects on Lift-Off Stabilization of Synthetic Fuels

    Lequien, Guillaume / Skeen, Scott / Manin, Julien et al. | British Library Conference Proceedings | 2015



    The ignition quality of residual fuels

    Barnes, G.K. / Liddy, J.P. / Marshall, E.L. | Tema Archiv | 1987


    The ignition quality of residual fuels

    Barnes,G. / Liddy,J. / Marshal,E. et al. | Kraftfahrwesen | 1987