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1-D simulation of turbocharged SI engines: focusing on a new gas exchange system and knock prediction
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Design (Div.).
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

This licentiate thesis concerns one dimensional flow simulation of turbocharged spark ignited engines. The objective has been to contribute to the improvement of turbocharged SI engines’ performance as well as 1 D simulation capabilities.

Turbocharged engines suffer from poor gas exchange due to the high exhaust pressure created by the turbine. This results in power loss as well as high levels of residual gas, which makes the engine more prone to knock.

This thesis presents an alternative gas exchange concept, with the aim of removing the high exhaust pressure during the critical periods. This is done by splitting the two exhaust ports into two separate exhaust manifolds.

The alternative gas exchange study was performed by measurements as well as 1-D simulations. The link between measurements and simulations is very strong, and will be discussed in this thesis.

As mentioned, turbocharged engines are prone to knock. Hence, finding a method to model knock in 1-D engine simulations would improve the simulation capabilities. In this thesis a 0-D knock model, coupled to the 1-D engine model, is presented

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , viii, 51 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2006:14
Keyword [en]
spark ignited engines, 1-D flow simulation, knock, Divided Exhaust Period, turbocharged engines
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-4218OAI: oai:DiVA.org:kth-4218DiVA: diva2:11285
Presentation
2006-12-15, Sal M3, KTH, Brinellvägen 64, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101112Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2010-11-12Bibliographically approved
List of papers
1. Correlation between engine simulations and measured data: experiences gained with 1D-simulations of turbocharged SI-engines
Open this publication in new window or tab >>Correlation between engine simulations and measured data: experiences gained with 1D-simulations of turbocharged SI-engines
(English)Manuscript (Other academic)
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-6541 (URN)
Note
QC 20101112Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2010-11-12Bibliographically approved
2. Divided exhaust period: a gas exchange system for turbocharged SI engines
Open this publication in new window or tab >>Divided exhaust period: a gas exchange system for turbocharged SI engines
2005 (English)In: SAE Paper 2005-01-1150, SAE , 2005Conference paper, Published paper (Refereed)
Abstract [en]

The necessity to limit the boost pressure in turbocharged gasoline engines results in higher exhaust pressure than inlet pressure at engine speeds when the wastegate is opened. This imbalance has a negative influence on the exhaust scavenging of the engine and results in high levels of residual gas and consequently the engine is more prone to knock.

Place, publisher, year, edition, pages
SAE, 2005
Series
SAE technical paper series, ISSN 0148-7191
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-6542 (URN)10.4271/2005-01-1150 (DOI)2-s2.0-79959817910 (Scopus ID)
Conference
SAE 2005 World Congress & Exhibition, April 2005, Detroit, MI, USA
Note
QC 20101111Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2010-12-09Bibliographically approved
3. Optimizing engine concepts by using a simple model for knock prediction
Open this publication in new window or tab >>Optimizing engine concepts by using a simple model for knock prediction
Show others...
2003 (English)In: SAE Paper 2003-01-3123, SAE , 2003Conference paper, Published paper (Refereed)
Abstract [en]

The objective of this paper is to present a simulation model for controlling combustion phasing in order to avoid knock in turbocharged SI engines. An empirically based knock model was integrated in a one-dimensional simulation tool. The empirical knock model was optimized and validated against engine tests for a variety of speeds and λ . This model can be used to optimize control strategies as well as design of new engine concepts.

Place, publisher, year, edition, pages
SAE, 2003
Series
SAE Technical Paper Series, ISSN 0148-7191
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-6543 (URN)10.4271/2003-01-3123 (DOI)
Conference
SAE Powertrain & Fluid Systems Conference & Exhibition, October 2003, Pittsburgh, PA, USA
Note
QC 20101111Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2010-12-09Bibliographically approved

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Citation style
  • apa
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