A numerical assessment of an innovative bowl geometry, featuring both a stepped-lip and radial-bumps, was carried out in order to evaluate its impact in terms of soot and NOx emissions as well as of fuel consumption. As a test case, a 4-cylinder 1.6L diesel engine for passenger car applications was selected. Starting from a validated 3D-CFD engine model, including a calibrated spray model and a detailed chemistry combustion model, a spray targeting study was initially carried out in order to optimize the spray pattern for the innovative bowl design. Next, in order to investigate the effects of the innovative bowl geometry on in-cylinder mixing and combustion processes, a sensitivity analysis on injection timing, injection pressure and EGR (Exhaust Gas Recirculation) rate was carried out. Results confirmed a significant impact of the innovative bowl shape on the combustion process and showed that the new bowl design can lead to significant reductions of soot emissions and fuel consumption compared to conventional bowl geometries, with a significant improvement of both soot-NOx and BSFC-NOx trade-offs.
Numerical Assessment of an Innovative Piston Bowl Concept in a Light-duty Diesel Engine / Millo, Federico; Piano, Andrea; Roggio, Salvatore; Bianco, Andrea; Pesce, Francesco Concetto; Vassallo, Alberto. - ELETTRONICO. - (2020), pp. 245-253. (Intervento presentato al convegno SIA POWERTRAIN & ENERGY 2020 tenutosi a Online digital platform nel 16 - 29 November 2020).
Numerical Assessment of an Innovative Piston Bowl Concept in a Light-duty Diesel Engine
Millo, Federico;Piano, Andrea;Roggio, Salvatore;
2020
Abstract
A numerical assessment of an innovative bowl geometry, featuring both a stepped-lip and radial-bumps, was carried out in order to evaluate its impact in terms of soot and NOx emissions as well as of fuel consumption. As a test case, a 4-cylinder 1.6L diesel engine for passenger car applications was selected. Starting from a validated 3D-CFD engine model, including a calibrated spray model and a detailed chemistry combustion model, a spray targeting study was initially carried out in order to optimize the spray pattern for the innovative bowl design. Next, in order to investigate the effects of the innovative bowl geometry on in-cylinder mixing and combustion processes, a sensitivity analysis on injection timing, injection pressure and EGR (Exhaust Gas Recirculation) rate was carried out. Results confirmed a significant impact of the innovative bowl shape on the combustion process and showed that the new bowl design can lead to significant reductions of soot emissions and fuel consumption compared to conventional bowl geometries, with a significant improvement of both soot-NOx and BSFC-NOx trade-offs.File | Dimensione | Formato | |
---|---|---|---|
SIAPWTE2020_Proceedings_.pdf
accesso riservato
Tipologia:
2a Post-print versione editoriale / Version of Record
Licenza:
Non Pubblico - Accesso privato/ristretto
Dimensione
512.12 kB
Formato
Adobe PDF
|
512.12 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11583/2979462