期刊
LUBRICANTS
卷 9, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/lubricants9040044
关键词
run-up simulation; semi-floating ring bearing; thrust bearing; two-phase flow cavitation; oil-whirl and oil-whip
资金
- FVV project [1258]
- Federal Ministry for Economic Affairs and Energy (BMWi)
- AIF (German Federation of Industrial Research Associations eV) [18760 BR]
- FVV (Research Association for Combustion Engines eV)
This study investigates the vibration behavior of turbocharger rotors, which is mainly influenced by acting loads, the type and operating condition of hydrodynamic bearings. Modelling bearings and considering outgassing processes and thrust bearing are essential for accurate prediction of sub-synchronous vibrations.
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 thermo-hydrodynamic 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.
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