As discussed in the Part I of this paper, a numerical activity is carried out in order to analyse the effects of fuel composition modelling in a turbocharged GDI engine for sport car applications. While Part I analyses the "ensemble averaged" macroscopic effects on spray evolution, mixture stratification, combustion and knock tendency, in Part II of this paper cycle-to-cycle variations are analysed and discussed using a multi-cycle LES numerical framework, again comparing results from a more traditional single-component fuel surrogate model to those of a multi-component one. A purposely developed numerical approach is applied to properly account for the effects of the Discrete-Continuous-Multi-Component fuel formulation on the charge preparation: just before the spark timing, each vaporized fuel fraction is lumped back into a single-component surrogate fuel to allow the combustion model (ECFM-3Z, in its LES formulation) to take place. At the beginning of a new injection process, the numerical framework for the injected spray is switched back to Multi-Component, thus allowing each fuel fraction to independently spread, vaporize and diffuse in the combustion chamber according to the cycle-specific characteristics. A detailed comparison between the two fuel formulations is carried out on both average and rms values of the most influencing fields just before the spark discharge.

Effects of fuel composition on charge preparation, combustion and knock tendency in a high performance GDI engine. Part II: Les analysis / D'Adamo, Alessandro; Giovannoni, Nicola; Nardi, Luca; Cantore, Giuseppe; D'Angelis, Angelo. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - 81:(2015), pp. 817-825. (Intervento presentato al convegno 69th Conference of the Italian Thermal Engineering Association, ATI 2014 tenutosi a Milan nel 10-13 September 2014) [10.1016/j.egypro.2015.12.159].

Effects of fuel composition on charge preparation, combustion and knock tendency in a high performance GDI engine. Part II: Les analysis

D'ADAMO, Alessandro;GIOVANNONI, NICOLA;NARDI, LUCA;CANTORE, Giuseppe;D'ANGELIS, ANGELO
2015

Abstract

As discussed in the Part I of this paper, a numerical activity is carried out in order to analyse the effects of fuel composition modelling in a turbocharged GDI engine for sport car applications. While Part I analyses the "ensemble averaged" macroscopic effects on spray evolution, mixture stratification, combustion and knock tendency, in Part II of this paper cycle-to-cycle variations are analysed and discussed using a multi-cycle LES numerical framework, again comparing results from a more traditional single-component fuel surrogate model to those of a multi-component one. A purposely developed numerical approach is applied to properly account for the effects of the Discrete-Continuous-Multi-Component fuel formulation on the charge preparation: just before the spark timing, each vaporized fuel fraction is lumped back into a single-component surrogate fuel to allow the combustion model (ECFM-3Z, in its LES formulation) to take place. At the beginning of a new injection process, the numerical framework for the injected spray is switched back to Multi-Component, thus allowing each fuel fraction to independently spread, vaporize and diffuse in the combustion chamber according to the cycle-specific characteristics. A detailed comparison between the two fuel formulations is carried out on both average and rms values of the most influencing fields just before the spark discharge.
2015
69th Conference of the Italian Thermal Engineering Association, ATI 2014
Milan
10-13 September 2014
81
817
825
D'Adamo, Alessandro; Giovannoni, Nicola; Nardi, Luca; Cantore, Giuseppe; D'Angelis, Angelo
Effects of fuel composition on charge preparation, combustion and knock tendency in a high performance GDI engine. Part II: Les analysis / D'Adamo, Alessandro; Giovannoni, Nicola; Nardi, Luca; Cantore, Giuseppe; D'Angelis, Angelo. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - 81:(2015), pp. 817-825. (Intervento presentato al convegno 69th Conference of the Italian Thermal Engineering Association, ATI 2014 tenutosi a Milan nel 10-13 September 2014) [10.1016/j.egypro.2015.12.159].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1115401
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