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Exhaust flow pulsation effect on radial turbine performance
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-7330-6965
KTH, School of Engineering Sciences (SCI), Mechanics.
2015 (English)In: 11th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2015, European Conference on Turbomachinery (ETC) , 2015Conference paper, Published paper (Refereed)
Abstract [en]

In the current vehicle manufacturing world the chase for a better fuel economy and better driveability is in high gear. One way of doing so is to investigate and optimize the turbocharger. In this paper the flow in a radial turbine of a passenger car turbocharger has been analysed by Large Eddy Simulations. The current simulations have investigated the effects of changing the inlet pulse frequency and inlet pulse shape on turbine's performance parameters (e.g. efficiency, shaft power, pressure distributions). Three different engine speeds and two different pulse shapes were chosen to be compared and analysed. With the total mass flow per pulse being constant for all cases there is a clear dependence of both pulse shape and frequency when it comes to e.g. wheel momentum. Higher frequency increases the peak momentum more than the minimum level. A reduction in pulse duration also increases peak momentum more than the minimum.

Place, publisher, year, edition, pages
European Conference on Turbomachinery (ETC) , 2015.
Keyword [en]
Compressors, Fluid dynamics, Fuel economy, Gear manufacture, Momentum, Superchargers, Thermodynamics, Turbines, Turbomachinery, Current simulation, Engine speed, Higher frequencies, Performance parameters, Pulse durations, Pulse frequencies, Radial turbines, Vehicle manufacturing, Large eddy simulation
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-174778ISI: 000380606100055Scopus ID: 2-s2.0-84983148690ISBN: 9780000000002 (print)OAI: oai:DiVA.org:kth-174778DiVA: diva2:877870
Conference
11th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2015, 23 March 2015 through 27 March 2015
Note

QC 20151208

Available from: 2015-12-08 Created: 2015-10-07 Last updated: 2017-02-27Bibliographically approved

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Mihaescu, Mihai

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  • apa
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