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Title: Run-up simulation of a semi-floating ring supported turbocharger rotor considering thrust bearing and mass-conserving cavitation
Author(s): Ziese, Christian
Irmscher, Cornelius
Nitzschke, SteffenLook up in the Integrated Authority File of the German National Library
Daniel, Christian
Woschke, ElmarLook up in the Integrated Authority File of the German National Library
Issue Date: 2021
Type: Article
Language: English
URN: urn:nbn:de:gbv:ma9:1-1981185920-785962
Subjects: Run-up simulation
Semi-floating ring bearing
Thrust bearing
Two-phase flow cavitation
Oil-whirl and oil-whip
Abstract: The vibration behaviour of turbocharger rotors is influenced by the acting loads as well as by the type and arrangement of the hydrodynamic bearings and their operating condition. Due to the highly non-linear bearing behaviour, lubricant film-induced excitations can occur, which lead to sub-synchronous rotor vibrations. A significant impact on the oscillation behaviour is attributed to the pressure distribution in the hydrodynamic bearings, which is influenced by the thermohydrodynamic conditions and the occurrence of outgassing processes. This contribution investigates the vibration behaviour of a floating ring supported turbocharger rotor. For detailed modelling of the bearings, the Reynolds equation with mass-conserving cavitation, the three-dimensional energy equation and the heat conduction equation are solved. To examine the impact of outgassing processes and thrust bearing on the occurrence of sub-synchronous rotor vibrations separately, a variation of the bearing model is made. This includes run-up simulations considering or neglecting thrust bearings and two-phase flow in the lubrication gap. It is shown that, for a reliable prediction of sub-synchronous vibrations, both the modelling of outgassing processes in hydrodynamic bearings and the consideration of thrust bearing are necessary.
Open Access: Open access publication
License: (CC BY 4.0) Creative Commons Attribution 4.0(CC BY 4.0) Creative Commons Attribution 4.0
Sponsor/Funder: OVGU-Publikationsfonds 2021
Journal Title: Lubricants
Publisher: MDPI
Publisher Place: Basel
Volume: 9
Issue: 4
Original Publication: 10.3390/lubricants9040044
Page Start: 1
Page End: 23
Appears in Collections:Fakultät für Maschinenbau (OA)

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