The spatial distribution of the mixture equivalence ratio within the squish volume is quantified under non-combusting conditions by planar laser-induced fluorescence (PLIF) of a fuel tracer (toluene). The measurements were made in a single-cylinder, direct-injection, light-duty diesel engine at conditions matched to an early-injection low temperature combustion mode. A fuel amount corresponding to a low load (3.0 bar indicated mean effective pressure) operating condition was introduced with a single injection. Data were acquired during the mixture preparation period from near the start of injection (-22.5° aTDC) until the crank angle where the start of high-temperature heat release normally occurs (-5° aTDC). Despite the opposing squish flow, the fuel jets penetrate through the squish region to the cylinder bore. Although rapid mixing is observed in the head of each jet, rich regions remain at the head at the start of high-temperature heat release. In contrast, the fuel mixture is generally lean in the clearance volume above the bowl, though near-stoichiometric pockets are observed near the bowl rim. Significant pockets of mixture in the central clearance volume, and between the jets in the squish volume, are sufficiently lean that complete oxidation is unlikely.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Measurement of Equivalence Ratio in a Light-Duty Low Temperature Combustion Diesel Engine by Planar Laser Induced Fluorescence of a Fuel Tracer


    Additional title:

    Sae Int. J. Engines


    Contributors:

    Conference:

    10th International Conference on Engines & Vehicles ; 2011


    Published in:

    Publication date :

    2011-09-11


    Size :

    14 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Fuel Effects on Low Temperature Combustion in a Light-Duty Diesel Engine

    Warey, Alok / Tomazic, Dean / Hardy, Jean-Paul et al. | SAE Technical Papers | 2010



    Equivalence Ratio Distributions in a Light-Duty Diesel Engine Operating under Partially Premixed Conditions

    Petersen, Benjamin / Sahoo, Dipankar / Miles, Paul C. | SAE Technical Papers | 2012


    Equivalence Ratio Distributions in a Light-Duty Diesel Engine Operating under Partially Premixed Conditions

    Petersen, B. / Miles, P. / Sahoo, D. et al. | British Library Conference Proceedings | 2012