A zero-dimensional model is introduced that combines recently presented empirical relationships for diesel jet penetration and flame lift-off length in order to produce a realistic heat release rate and predict the temperature and equilibrium species concentrations in five zones within the combustion chamber. The new model describes the compression, combustion and expansion portions of a diesel cycle. During fuel injection and combustion, the temperature, geometry, and composition of five zones are calculated: 1) vaporizing fuel and air, 2) vaporized reactants, 3) premixed products, 4) adiabatic flame sheath, and 5) surrounding charge gas. The apparent heat release rate predicted by the model is compared with data from a constant volume combustion vessel (CVCV) and two single-cylinder direct-injection diesel engines. The rate of charge air entrainment is determined from the correlation of a non-vaporizing, non-reacting jet with no wall impingement. Jet-to-jet interactions are found to be significant in describing heat release and a sub-model was developed for this interaction. The results show that in all cases the initial rise in the apparent heat release rate is over-predicted by the model. Peak heat release rates can be found from either the flame length or the interaction length of the jet. The shape of the apparent heat release in the CVCV, where there is no wall or jet interaction, is well characterized by the model, as is the steady-state apparent heat release rate. The modeled diesel engine results do not produce the correct shape for the “diffusion burn” period without the jet interaction sub-model, but are much improved with it included. Trends in combustion duration, pressure, and temperature are captured by the model. The over-prediction of heat release exhibited by the model is attributed to the fact that the flame location lies within the jet boundary and therefore, not all of the air entrained into the jet has reached the flame.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    An Empirical, Mixing-Limited, Zero-Dimensional Model for Diesel Combustion


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    SAE 2004 World Congress & Exhibition ; 2004



    Erscheinungsdatum :

    2004-03-08




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    An Empirical, Mixing-Limited, Zero-Dimensional Model for Diesel Combustion

    Asay, R. J. / Svensson, K. I. / Tree, D. R. et al. | British Library Conference Proceedings | 2004


    An empirical, mixing-limited, zero-dimensional model for diesel combustion

    Asay,R.J. / Svensson,K.I. / Tree,D.R. et al. | Kraftfahrwesen | 2004


    Development of a Mixing and Combustion Zero-Dimensional Model for Diesel Engines

    Mocholí, Elena M. / López, J. Javier / Martín, Jaime et al. | SAE Technical Papers | 2006


    Development of a mixing and combustion zero-dimensional model for diesel engines

    Arregle,JK. / Lopez,J.J. / Martin,J. et al. | Kraftfahrwesen | 2006


    Mixing-Limited Combustion of Alcohol Fuels in a Diesel Engine

    Zhou, Apeng / Johnson, Bernard / Longman, Douglas et al. | SAE Technical Papers | 2019