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Numerical computation of the pulsatile flow in a turbocharger with realistic inflow conditions from an exhaust manifold
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.
2009 (English)In: Proceedings of ASME Turbo Expo 2009, 2009, no PART B, 1317-1329 p.Conference paper (Refereed)
Abstract [en]

The combined effect of different secondary perturbations at the turbine inlet and the pulsatile flow on the turbine performance was assessed and quantified by using Large Eddy Simulation. The geometrical configuration consists of a 4-1 exhaust manifold and a radial turbine. At the inlet to each port of the manifold, engine realistic pulsatile mass flow and temperature fields are specified. The turbine used in mis numerical study is a vaneless radial turbine with 9 blades, with a size that is typical for a turbocharger mounted on a 2.0 liters IC engine of passenger cars. The flow field is investigated and the generated vortices are visualized to enable a better insight into the unsteady flow field. Correlations between the turbine inflow conditions, such as mass flow rate, strength of secondary flow components, and the turbine performance have also been studied. The results show that the flow field entering the turbine is heavily disturbed with strong secondary flow components and disturbed axial velocity profile. Between the inlet to the turbine and the wheel, the strength of the secondary flow and the level of the disturbances of the axial flow decrease which gives large losses in this region. Even though the magnitude of the disturbances decrease, the flow entering the wheel will still be disturbed, resulting in a perturb inlet flow to me wheel which affects the shaft power output from the turbine.

Place, publisher, year, edition, pages
2009. no PART B, 1317-1329 p.
Keyword [en]
Axial velocity, Combined effect, Exhaust manifold, Geometrical configurations, IC engines, Inflow conditions, Mass flow, Mass flow rate, Numerical computations, Numerical studies, Radial turbines, Shaft power, Temperature field, Turbine inlets, Turbine performance, Automobile engine manifolds, Automobiles, Cascades (fluid mechanics), Flow fields, Mass transfer, Pulsatile flow, Secondary flow, Superchargers, Turbines, Turbomachine blades, Unsteady flow, Wheels, Inlet flow
National Category
Other Mechanical Engineering
URN: urn:nbn:se:kth:diva-152423DOI: 10.1115/GT2009-59619ISI: 000277073700120ScopusID: 2-s2.0-77953198158ISBN: 978-079184888-3OAI: diva2:751447
2009 ASME Turbo Expo, 8 June 2009 through 12 June 2009, Orlando, FL, United States

QC 20141001

Available from: 2014-10-01 Created: 2014-09-26 Last updated: 2014-10-01Bibliographically approved

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Hellström, FredrikFuchs, Laszlo
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