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Hybrid bearing development for high-speed turbomachinery in distributed energy systems

Tkacz E., Kozanecki Z., Łagodziński J.

Transactions of the Institute of Fluid-Flow Machinery

2016

nr 131

161--172

In the paper authors undertake the design of hydrostatic bearings and hybrid bearings for a speciﬁc application – hermetic high–speed turbogenerators for the electric power generation. The most common hydrostatic bearings are usually oil lubricated. On the contrary, the considered here machines are dedicated for the combined heat and power (CHP) production in organic Rankine cycle (ORC) systems and so the hydrostatic bearings use an organic, oil-free working ﬂuid as the lubricant. The reader will acquire an insight into the special characteristics of hydrostatic bearings. Moreover, a new type of bearings, a hybrid bearing, is introduced, which combine both, hydrostatic and hydrodynamic eﬀects. The designed bearings have been manufactured and their good performance conﬁrmed during tests on a real machine.

Oil free bearing development for high-speed turbomachinery in distributed energy systems – dynamic and environmental evaluation

Tkacz E., Kozanecka D., Kozanecki Z., Łagodziński J.

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2014

nr 145

121--122

Modern distributed energy systems, which are used to provide an alternative to or an enhancement of traditional electric power systems, require small size high-speed rotor turbomachinery to be developed. The existing conventional oil-lubricated bearings reveal performance limits at high revolutions as far as stability and power loss of the bearing is concerned. Non-conventional, oil-free bearings lubricated with the machine working medium could be a remedy to this issue. This approach includes a correct design of the machine flow structure and an accurate selection of the bearing type. Chosen aspects of the theoretical and experimental investigations of oil-free bearings and supports, including magnetic, tilting pad, pressurized aerostatic and hydrostatic bearings as well as some applications of oil-free bearing technology for high-speed turbomachinery are described in the paper.