A five-cylinder diesel engine, converted to a single cylinder operated optical engine is run in Homogeneous Charge Compression Ignition (HCCI) mode. A blend of iso-octane and n-heptane is used as fuel.An experimental study of the horizontal boundary layer between the main combustion and the non-reacting surface of the combustion chamber is conducted as a function of speed, load, swirl and injection strategy. The combustion behaviour is monitored by chemiluminescence measurements.For all cases an interval from -10 to 16 crank angles after top dead center (CAD ATDC) in steps of one CAD are studied. One image-intensified camera observes the boundary layer up close from the side through a quartz cylinder liner while a second camera has a more global view from below to see more large scale structure of the combustion.The averaged chemiluminescence intensity from the HCCI combustion is seen to scale well with the rate of heat release. A boundary layer is defined and studied in detail between the main combustion volume and the piston crown surface as a function of crank angle. The boundary layer is found to be in the range from 2 to 4 mm for all cases by the definition used; however, the location for the measurements becomes more and more important as combustion becomes more inhomogeneous. To get accurate calculations, the level of noise must also be considered and definitions of boundary layer thickness should not be made at to low chemiluminescence intensity.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Investigation of Boundary Layer Behaviour in HCCI Combustion using Chemiluminescence Imaging


    Additional title:

    Sae Technical Papers


    Contributors:
    Hultqvist, A. (author) / Johansson, B. (author) / Persson, H. (author) / Ruebel, J. (author) / Hildingsson, L. (author)

    Conference:

    Powertrain & Fluid Systems Conference & Exhibition ; 2005



    Publication date :

    2005-10-24




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Investigation of boundary layer behaviour in HCCI combustion using chemoluminescence imaging

    Persson,H. / Hildingsson,L. / Hultqvist,A. et al. | Automotive engineering | 2005


    An investigation of thermal stratification in HCCI engines using chemiluminescence imaging

    Dec,J.E. / Hwang,W. / Sjoeberg,M. et al. | Automotive engineering | 2006


    An Investigation of Thermal Stratification in HCCI Engines Using Chemiluminescence Imaging

    Dec, John E. / Sjöberg, Magnus / Hwang, Wontae | SAE Technical Papers | 2006


    Investigation of the Early Flame Development in Spark Assisted HCCI Combustion Using High Speed Chemiluminescence Imaging

    Persson, H. / Hultqvist, A. / Johansson, B. et al. | British Library Conference Proceedings | 2007