| 摘要 |
A hybrid hydrodynamic/hydrostatic bearing arrangement suitable for high-speed, high temperature operations, for example a gas turbine propulsion engine is described. A large diameter bearing is constructed on the external circumference of a turbine rotor (2,20). The bearing stator (30) is mounted on the inside of the turbine casing (42). For hydrostatic operation the bearing (36,38) is provided with a supply of pressurised air derived for the high-pressure compressor of the engine. Two alternatives ways of supplying air for the bearing fluid film are proposed. In one proposal, for use where the turbine blades (8,26) are internally cooled, air is routed to the bearing space from the blade internal cooling system through apertures in the bearing rotor (2,20) carried by a blade tip shroud. In the second, the air is supplied through apertures in the bearing stator on the inside of the turbine casing (42) form an external manifold (72). For initial start-up air may be provided from an external high-pressure source. A lubricant may also be applied to the bearing surfaces to reduce initial wear. |
