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Instantaneous On-Engine Turbine Efficiency for an SI Engine in the Closed Waste Gate Region for 2 Different Turbochargers
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
2006 (English)In: SAE Technical Papers, 2006, no 01-3389Conference paper, Published paper (Refereed)
Abstract [en]

1D engine simulations of turbocharged engines are difficult to perform with good accuracy. Calculations of turbine performance are based on performance maps. These are measured under steady flow conditions using air at moderate temperatures, not very representative of the very hot and pulsating gas flow the on-engine turbine is exposed to. To improve the predictivity of today's 1D engine calculations or the limiting factors of the turbocharger itself, it is most important to gain deeper understanding of how the turbine behaves under on-engine conditions.

The objective of this paper is to compare calculated instantaneous on-engine turbine efficiency based on measurements with results from using steady-flow efficiency performance maps. The work is performed using two different turbochargers at two operating points with closed waste gate.

It is shown that the turbine efficiency characteristic derived from measurements and that from using steady-flow efficiency performance maps describe a quite different behavior of the turbine. The on-engine turbine efficiency has systematically shown to be asymmetric over an exhaust pulse. It is considerably higher during the “downhill side” of the pulse, a phenomenon not captured by the 1D quasi steady calculations.

An error estimation is made for the measurement-based efficiency. The cumulative error results from individual measurement errors of its constituent parameters. The efficiency uncertainty is most governed and very sensitive to the measurement error of the turbine shaft speed. The pressure before and after the turbine are also important to measure correctly.

Place, publisher, year, edition, pages
2006. no 01-3389
Identifiers
URN: urn:nbn:se:kth:diva-24679DOI: 10.4271/2006-01-3389Scopus ID: 2-s2.0-79959848121OAI: oai:DiVA.org:kth-24679DiVA: diva2:352681
Note

QC 20100922

Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2017-04-28Bibliographically approved
In thesis
1. Analysis of shortcomings with 1-D engine calculations by means of 3-D computations on components
Open this publication in new window or tab >>Analysis of shortcomings with 1-D engine calculations by means of 3-D computations on components
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2010. 126 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2010:02
Identifiers
urn:nbn:se:kth:diva-13095 (URN)978-91-7415-613-3 (ISBN)
Public defence
2010-05-26, Sal M3, Brinellvägen 64, KTH, Stockholm, 11:30 (English)
Opponent
Supervisors
Note
QC 20100922Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-09-22Bibliographically approved

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Olofsson, Ulf

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