3D-CFD Methodologies for a Fast and Reliable Design of Ultra-Lean SI Engines
The continuous pursuit of higher combustion efficiencies, as well as the possible usage of synthetic fuels with different properties than fossil-ones, require reliable and low-cost numerical approaches to support and speed-up engines industrial design. In this context, SI engines operated with homogeneous ultra-lean mixtures both characterized by a classical ignition configuration or equipped with an active prechamber represent the most promising solutions. In this work, for the classical ignition arrangement, a 3DCFD strategy to model the impact of the ignition system type on the CCV is developed using the RANS approach for turbulence modelling. The spark-discharge is modelled through a set of Lagrangian particles, whose velocity is modified with a zero-divergence perturbation at each discharge event, then evolved according to the Simplified Langevin Model (SLM) to simulate stochastic interactions with the surrounding gas flow. For the active prechamber configuration, instead, a CFD methodology based on a 3DRANS approach is proposed to model the combustion process, in which the air-fuel mixture distribution inside the prechamber is properly considered without a 3D simulation of the main chamber intake process. This is carried out through a non-reacting simulation of the prechamber-only until IVC, then results are interpolated on a different 3D engine mesh for the further compression and combustion stages. The proposed methodologies were assessed and validated against experimental measurements at different operating conditions.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/01487191
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Supplemental Notes:
- Abstract reprinted with permission of SAE International.
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Authors:
- Sforza, Lorenzo
- Lucchini, Tommaso
- D'Errico, Gianluca
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Conference:
- CO2 Reduction for Transportation Systems Conference
- Location: Turin , Italy
- Date: 2022-6-21 to 2022-6-22
- Publication Date: 2022-6-14
Language
- English
Media Info
- Media Type: Web
- Features: References;
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Serial:
- SAE Technical Paper
- Publisher: Society of Automotive Engineers (SAE)
- ISSN: 0148-7191
- EISSN: 2688-3627
- Serial URL: http://papers.sae.org/
Subject/Index Terms
- TRT Terms: Combustion; Engines; Fluid dynamics; Ignition systems; Reliability; Simulation; Spark ignition engines; Synthetic fuels; Wind tunnels
- Subject Areas: Highways; Vehicles and Equipment;
Filing Info
- Accession Number: 01853183
- Record Type: Publication
- Source Agency: SAE International
- Report/Paper Numbers: 2022-37-0006
- Files: TRIS, SAE
- Created Date: Jul 26 2022 2:13PM