A four-valve-pentroof, direct-injection, optical engine fueled with n-heptane has been operated at four different steady-state HCCI operating conditions including 10% and 65% residuals, both at low and high swirl conditions. Both, planar toluene LIF and volume chemiluminescence show large scale inhomogeneity in the ensemble averaged images. The interpretation of the toluene-tracer LIF signals (when premixed with the fresh-air charge) as a marker for reaction homogeneity is discussed. A binarization scheme and a statistical analysis of the LIF images were applied to the per-cycle planar-LIF images revealing inhomogeneities both from cycle-to-cycle and within the regions of individual cycles that track with the average heat release rate. Comparison of these two homogeneity metrics between the four operating conditions reveals weak but discernable differences.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Inhomogeneities in HCCI Combustion: An Imaging Study


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    2005 SAE Brasil Fuels & Lubricants Meeting ; 2005



    Publication date :

    2005-05-11




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Inhomogeneities in HCCI combustion: an imaging study

    Reuss,D.L. / Sick,V. / General Motors Res.and Dev.Center,US et al. | Automotive engineering | 2005


    Simulation of HCCI combustion with spatial inhomogeneities via a locally deterministic approach

    Lee, Y. J. / Huh, K. Y. | British Library Online Contents | 2010




    HCCI Combustion

    Winklhofer, E. | British Library Conference Proceedings | 2003