| 摘要 |
A brush seal (10) for sealing a circumferential gap between two relatively rotating machine components, e.g. the rotor (14) or shaft and stator (12) of a fluid flow machine, such as a gas turbine engine. One end of a plurality of seal bristles (16) is fixed in an annular shape and are mounted to the stator, and their opposite ends are attached to a number of individual shoes (24) located at the rotor. The shoes function very similarly to that of a tilting pad bearing shoe. Prior to shaft (14) rotation, the shoes are in contact with the rotor surface with preferably the leading edge (26) of each shoe set to have less contact than the trailing edge (28) of the shoe. As such, when the rotor begins to rotate, a hydrodynamic wedge is created which lifts the shoe slightly off the surface of the shaft allowing the shoe to effectively "float" over the shaft at a design gap.
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