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Influence of Upstream Exhaust Manifold on Pulsatile Turbocharger Turbine Performance
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx). KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-6090-1498
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-2906-9306
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0001-7330-6965
2019 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919, Vol. 141, no 6Article in journal (Refereed) Published
Abstract [en]

This research was primary motivated by limited efforts to understand the effects of secondary flow and flow unsteadiness on the heat transfer and the performance of a turbocharger turbine subjected to pulsatile flow. In this study, we aimed to investigate the influence of exhaust manifold on the flow physics and the performance of its downstream components, including the effects on heat transfer, under engine-like pulsatile flow conditions. Based on the predicted results by detached eddy simulation (DES), qualitative and quantitative flow fields analyses in the scroll and the rotor's inlet were performed, in addition to the quantification of turbine performance by using the flow exergy methodology. With the specified geometry configuration and exhaust valve strategy, our study showed that (1) the exhaust manifold influences the flow field and the heat transfer in the scroll significantly and (2) although the exhaust gas blow-down disturbs the relative flow angle at rotor inlet, the consequence on the turbine power is relatively small.

Place, publisher, year, edition, pages
2019. Vol. 141, no 6
Keywords [en]
turbocharger turbine, engine-like pulsatile flow, heat transfer, exergy, DES
National Category
Mechanical Engineering Fluid Mechanics and Acoustics Vehicle Engineering
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-244665DOI: 10.1115/1.4042301Scopus ID: 2-s2.0-85061841259OAI: oai:DiVA.org:kth-244665DiVA, id: diva2:1291212
Conference
141(6), 061010
Funder
Swedish Energy Agency, 33834-3
Note

QC 20190226

Available from: 2019-02-22 Created: 2019-02-22 Last updated: 2019-06-11Bibliographically approved

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Lim, Shyang MawDahlkild, AndersMihaescu, Mihai

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Mechanical EngineeringFluid Mechanics and AcousticsVehicle Engineering

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