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Predictions of the Performance of a Radial Turbine with Different Modeling Approaches: Comparison of the Results from 1-D and 3-D CFD
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Internal Combustion Engines.
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Centre for Internal Cumbustion Engine Research Opus, CICERO (closed 20101231).
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Industrial Engineering and Management (ITM), Centres, Centre for Internal Cumbustion Engine Research Opus, CICERO (closed 20101231).
2010 (English)In: SAE technical paper series, ISSN 0148-7191, no 01-1223Article in journal (Refereed) Published
Abstract [en]

In this paper, the performance of a radial turbine working under pulsatile flow conditions is computed with two different modeling approaches, time resolved 1-dimensional (1-D) and 3-dimensional (3-D) CFD. The 1-D modeling approach is based on measured turbine maps which are used to compute the mass flow rate and work output from the turbine for a given expansion ratio and temperature at the inlet. The map is measured under non-pulsatile flow conditions, and in the 1-D method the turbine is treated as being a quasi-stationary flow device. In the 3-D CFD approach, a Large Eddy Simulation (LES) turbulence approach is used. The objective of LES is to explicitly compute the large scales of the turbulence while modeling the effects of the unresolved scales.

Three different cases are considered, where the simplest case only consist of the turbine and the most complex case consist of an exhaust manifold and the turbine. Both time resolved data, such as pressure ratio, temperature and shaft torque and time mean data from the two different modeling approaches are compared. The results show that the computed time mean shaft power differs between the two different modeling approaches with as much as 100%. Since the considered operation point for the engine in this study is 1500 rpm with wide open throttle, the turbine operates in an area where the turbine map is extrapolated. Only by using a few operation points from CFD to extend the map, an improvement is achieved for the 1-D results, but still the deviation is large. Also, the pressure ratio and temperature drop over the turbine differs for the used modeling approaches. The causes for the deviations are assessed and discussed to get a better understanding of eventually limitations of the 1-D modeling approach.

Place, publisher, year, edition, pages
2010. no 01-1223
Identifiers
URN: urn:nbn:se:kth:diva-24683DOI: 10.4271/2010-01-1223Scopus ID: 2-s2.0-84877226366OAI: oai:DiVA.org:kth-24683DiVA: diva2:352697
Note

QC 20100922

Available from: 2010-09-22 Created: 2010-09-22 Last updated: 2017-04-18Bibliographically 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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