Numerical simulations of in-cylinder soot evolution in the optically accessible heavy-duty diesel engine of Sandia National Laboratories have been performed with the multidimensional conditional moment closure (CMC) model using a reduced n-heptane chemical mechanism coupled with a two-equation soot model. Simulation results are compared to the high-fidelity experimental data by means of pressure traces, apparent heat release rate (AHRR) and time-resolved in-cylinder soot mass derived from optical soot luminosity and multiple wavelength pyrometry in conjunction with high speed soot cloud imaging. In addition, spatial distributions of soot relevant quantities are given for several operating conditions.A broad range of operating conditions has been considered: a sweep in start of injection (SOI) at unchanged top dead center (TDC) ambient conditions and a sweep in TDC temperature at an ambient oxygen volume fraction of 12.7 percent, corresponding to a high level of exhaust gas recirculation (EGR). Ignition delays were captured very well, using unaltered model constants and kinetic parameters. The model was found to reproduce pressure and AHRR traces fairly well, although the premixed portion of combustion was in general slightly underpredicted. Concerning emissions, a quantitative comparison of soot mass evolution is presented. Considering the broad range of conditions the model was capable to reproduce the soot trends well; the predicted peak soot mass agreed within a factor of approximately two for almost all operating conditions considered.Overall, the findings suggest that the presented semi-empirical soot model integrated into the CMC framework is a highly promising approach for the prediction of in-cylinder soot evolution for various diesel engine operating conditions.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Predicting In-Cylinder Soot in a Heavy-Duty Diesel Engine for Variations in SOI and TDC Temperature Using the Conditional Moment Closure Model


    Additional title:

    Sae Int. J. Engines


    Contributors:

    Conference:

    11th International Conference on Engines & Vehicles ; 2013


    Published in:

    Publication date :

    2013-09-08


    Size :

    14 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Conditional Moment Closure Approaches for Simulating Soot and NOx in a Heavy-Duty Diesel Engine

    Barro, Christophe / Mastorakos, Epaminondas / Parravicini, Matteo et al. | SAE Technical Papers | 2021


    Conditional Moment Closure Approaches for Simulating Soot and NOx in a Heavy-Duty Diesel Engine

    Trivedi, Shrey / Gkantonas, Savvas / Wright, Yuri M. et al. | British Library Conference Proceedings | 2021


    Multi-dimensional Conditional Moment Closure modelling applied to a heavy-duty common-rail diesel engine

    Wright,Y.M. / Boulouchos,K. / Poala,G.de et al. | Automotive engineering | 2009


    Multi-dimensional Conditional Moment Closure Modelling Applied to a Heavy-duty Common-rail Diesel Engine

    Mastorakos, E. / De Paola, G. / Boulouchos, K. et al. | SAE Technical Papers | 2009