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Potentials of the Oversizing and H2-supported Lean Combustion of a VVA SI Gasoline Engine towards Efficiency Improvement University of Naples Federico II
- Format:
- Book
- Conference/Event
- Author/Creator:
- Bozza, Fabio, author.
- Conference Name:
- 15th International Conference on Engines & Vehicles (2021-09-12 : Capri, Italy)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- In the recent years, the internal combustion engine (ICE) downsizing coupled to turbocharging was considered the most effective path to improve engine efficiency at low load, without penalizing rated power/torque performance at full load. On the other side, issues related to knocking combustions and excessive exhaust gas temperatures obliged to adopt countermeasures which highly affect the efficiency, such as fuel enrichment and delayed combustions.Powertrain electrification allows to operate the ICE mostly at medium / high loads, shifting design needs and constraints towards targeting high efficiency under those operating conditions. Conversely, engine efficiency at low loads becomes a less important issue. In this track, the aim of this work is the investigation of the potential of the oversizing of a small VVA SI gasoline engine towards efficiency increase and tailpipe emission reduction. To enhance the potential improvements of such approach, a lean combustion concept is adopted, where the flame speed propagation is supported by the addition of a small percentage of hydrogen to the gasoline (from 5% to 10% by volume).The analysis is carried out by a synergic employment of 1D/3D simulation tools, widely validated for the base engine supplied with pure gasoline and under stoichiometric/rich combustions. The combustion and knock models are here extended to handle the flame speed and auto-ignition characteristics of gasoline/H2 blends.The comparison between the base gasoline engine and the oversized gasoline/H2 variant highlights significant efficiency advantages at full load operations, which are due to the possibility to remove fuel enrichment and combustion delays. Minor improvements emerge at lower loads, mainly related to the lean combustion, which enhances thermodynamic properties of in-cylinder mixture, and reduces pumping and heat losses
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-24-0007
- Access Restriction:
- Restricted for use by site license
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