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Instantaneous On-Engine Twin-Entry Turbine Efficiency Calculations on a Diesel Engine
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.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Tribologi.ORCID iD: 0000-0003-2489-0688
2005 (English)In: Powertrain & Fluid Systems Conference & Exhibition Technical Papers, 2005Conference paper, Published paper (Other academic)
Abstract [en]

One-dimensional engine simulation codes are frequently used for engine development where turbine performance is in focus for overall engine performance. Turbocharger performance can today not be accurately simulated without adjustments of the turbine efficiency and mass flow multipliers. In spite of the fact that engine exhausts are dominated by unsteady pulsating flow the performance maps provided by the turbo manufacturers are measured under steady conditions and for a range that does not cover the entire turbine operating range.

Place, publisher, year, edition, pages
2005.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-26602DOI: 10.4271/2005-01-3887Scopus ID: 2-s2.0-84877418514OAI: oai:DiVA.org:kth-26602DiVA: diva2:372587
Conference
2005 SAE Powertrain & Fluid Systems Conference
Note
QC 20101126. SAE Technical Paper 2005-01-3887Available from: 2010-11-26 Created: 2010-11-26 Last updated: 2011-12-15Bibliographically 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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Olofsson, Ulf

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