This work investigates the impact of injector temperature on the characteristics of high-pressure n-dodecane sprays under conditions relevant to heavy-duty diesel engines. Sprays are injected from a pair of single-hole diesel injectors belonging to the family of “Spray C” and “Spray D” Engine Combustion Network (ECN) injectors. Low and high injector temperature conditions are achieved by activating or deactivating a cooling jacket. We quantify spray spreading angle and penetration using high-speed shadowgraphy and long-distance microscopy imaging. We evaluate differences in fuel/air mixture formation at key timings through one-dimensional modeling. Injections from a cooled injector penetrate faster than those from a higher temperature injector, especially for an injector already prone to cavitation (Spray C). When uncooled, Spray C exhibited a time-varying spreading angle at early times during the injection event, which exacerbates the reduction in initial penetration rate relative to the cooled injector. Changes in fuel density alone cannot account for the observed trends, and we show that implementing a transient spreading angle in the model (guided by the time-sequenced images) is an effective solution to match experimental penetration characteristics. Time- and axially resolved radial mixture fractions derived from the model reveal that failure to account for early spreading angle transients and their impact on penetration and mixture formation leads to erroneous mixture fraction distributions at key timings associated with first- and second-stage ignition. Such oversights could lead the community toward incorrect model calibrations.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    The Effects of Injector Temperature on Spray Characteristics in Heavy-Duty Diesel Sprays


    Additional title:

    Sae Int. J. Engines


    Contributors:
    Cenker, Emre (author) / Pickett, Lyle (author) / Skeen, Scott (author) / Daly, Shane (author)

    Conference:

    WCX World Congress Experience ; 2018


    Published in:

    Publication date :

    2018-04-03


    Size :

    13 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Influence of Elevated Injector Temperature on the Spray Characteristics of GDI Sprays

    Naber, Jeffrey / Miganakallu Narasimhamurthy, Niranjan / Atkinson, William et al. | SAE Technical Papers | 2019


    Effects of different injector hole shapes on diesel sprays

    Dodge,L.G. / Ryan,T.W. / Ryan,M.G. et al. | Automotive engineering | 1992


    Effects of Different Injector Hole Shapes on Diesel Sprays

    Dodge, Lee G. / Ryan, Michael G. / Ryan, Thomas W. | SAE Technical Papers | 1992


    Modeling the effects of injector nozzle geometry on diesel sprays

    von Kuensberg Sarre,C. / Kong,S.C. / Reitz,R.D. et al. | Automotive engineering | 1999


    Near-Nozzle Spray Characteristics of Heavy-Duty Diesel Injectors

    Powell, Christopher F. / EL-Hannouny, Essam M. / Wang, Jin et al. | SAE Technical Papers | 2003