Labyrinth seal e.g. tripping collar labyrinth seal, for aircraft gas turbine, has sealing ring comprising upper flank region coated with wear resistant material, where flank region has slew rate that is reduced against lower flank region

摘要

The seal has a sealing ring (5) provided with a wear resistant layer that is applied by a spraying process, and engaged in an inlet layer (6). The sealing ring is charged directly by an air stream and comprises an uncoated lower flank region (11) with high slew rate causing high congestion effect. The sealing ring comprises an upper flank region (9) engaged in the inlet layer and coated on both sides with wear resistant material by spraying process. The upper flank region has slew rate that is reduced against the lower flank region.