The hole diameter of injection nozzles in diesel engines has become smaller and the nozzle coking could potentially cause injection characteristics and emissions to deteriorate. In this research, engine tests with zinc-added fuels, deposit analyses, laboratory tests and numerical calculations were carried out to clarify the deposit formation mechanisms. In the initial phase of deposit formation, lower zinc carboxylate formed close to the nozzle hole outlet by reactions between zinc in the fuel and lower carboxylic acid in the combustion gas. In the subsequent growth phase, the main component changed to zinc carbonate close to nozzle hole inlet by reactions with CO₂ in the combustion gas. Metal components and combustion gases are essential elements in the composition of these deposits. One way of removing these deposits is to utilize cavitations inside the nozzle holes.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Injection Nozzle Coking Mechanism in Common-rail Diesel Engine


    Additional title:

    Sae Int. J. Fuels Lubr
    Sae International Journal of Fuels and Lubricants


    Contributors:

    Conference:

    SAE International Powertrains, Fuels and Lubricants Meeting ; 2011



    Publication date :

    2011-08-30


    Size :

    10 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Injection nozzle coking mechanism in common-rail diesel engine

    Ikemoto,M. / Omae,K. / Nakai,K. et al. | Automotive engineering | 2011


    Injection Nozzle Coking Mechanism in Common-rail Diesel Engine

    Ikemoto, M. / Omae, K. / Nakai, K. et al. | British Library Conference Proceedings | 2011


    20114785 Injection Nozzle Coking Mechanism in Common-rail Diesel Engines

    Ikemoto, M. / Omae, K. / Nakai, K. et al. | British Library Online Contents | 2011


    Research Concerning Injection Nozzle Shape for Direct-Injection Diesel Engine Using Common Rail Injection System

    Federation Internationale des Societes d'Ingenieurs des Techniques de l'Automobile | British Library Conference Proceedings | 2002


    Influence on injection nozzle coking in diesel engines

    Grueting,U. / Pischinger,S. / Tang,J. et al. | Automotive engineering | 2009