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Simulations and Measurements of a Two-Stage Turbocharged Heavy-Duty Diesel Engine Including EGR in Transient Operation
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
2008 (English)In: Modeling of SI and Diesel Engines, 2008, 2008Conference paper, Published paper (Other academic)
Abstract [en]

To meet future demands with respect to emissions for heavy-duty diesel engines high EGR rates together with an optimized injection system are most likely required. The increase in smoke production associated with EGR, especially during transient operation implies that high boost pressures are needed to at least maintain the air excess ratio. To reach required boost pressure without extending the response time a more advanced turbocharger system than the use of a single turbocharger might be needed. A possible solution is two-stage turbocharger systems.

Place, publisher, year, edition, pages
2008.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-26609DOI: 10.4271/2008-01-0539Scopus ID: 2-s2.0-84877188099ISBN: 978-0-7680-1998-8 (print)OAI: oai:DiVA.org:kth-26609DiVA: diva2:372608
Conference
2008 SAE World Congress, Detroit
Note
QC 20101126. SAE Technical Paper 2008-01-0539Available from: 2010-11-26 Created: 2010-11-26 Last updated: 2010-11-26Bibliographically approved
In thesis
1. Transient simulations of heavy-duty diesel engines with focus on the turbine
Open this publication in new window or tab >>Transient simulations of heavy-duty diesel engines with focus on the turbine
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

The finite response time of the turbocharger is the most notable effect oftransient operation on a turbocharged diesel engine. To fulfil future emission requirements high amounts of transient EGR will be required. This impliesthat advanced turbocharger systems have to be introduced to enable high boost pressures with improved or at least maintained response time. The increased amount of tunable parameters from the more advanced turbocharging system will make it difficult to optimise the engine experimentally. Therefore the wish is to optimise the engine numerically, however this is a difficult task which demands more knowledge within the field of modelling the gas exchange system and its components, which is the aim of the present work. Engine simulations have been performed in the 1-dimensional fluid dynamic code GT-Power for transient operation and validated with engine measurements. The turbine was modelled according to the state of the art which is via look-up tables with measured turbine performance data from a steady-flow rig and used under the assumption that the turbine behaves in a quasi-steady manner. Turbine performance data was also obtained via the semi-empirical turbine design software, Rital for comparison. A heavy-duty diesel engine has been modelled with two different gas exchange system configurations. The standard configuration with a single twin-entry turbine and a rebuilt gas exchange system including a two-stage turbocharging system and high pressure loop for EGR. The results shows that it is difficult to predict the performance of the gas exchange system and its components, especially the turbine performance. When trying to predict turbine performance under transient operation the difficulties added, compared to stationary operation are long scale transients as wall temperature gradients in the cylinder and the exhaust manifold which directly influences the amount of isentropic energy to the turbine. This makes it even more difficult to predict the isentropic exhaust gas energy content compared to stationary operation, which is difficult to measure and therefore to state how well the turbine model actually performs. However, even though it is difficult to predict engine performance in detail the models have proved to be useful for concept studies as a help in engine design.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. viii, 33 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2008:02
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-4685 (URN)
Presentation
2008-04-09, M3, M, Brinellvägen 64, M, 10:00
Opponent
Supervisors
Note
QC 20101126Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2010-11-26Bibliographically approved

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