TURBINE OF GAS TURBINE ENGINE CONTAINING LABYRINTH SEAL ELEMENT Russian patent published in 2020 - IPC F01D11/12 

FIELD: engine building.

SUBSTANCE: subject of invention is gas turbine engine turbine comprising stator ring sealing element (31), configured to form a labyrinth seal in combination with at least one movable ridge rotating around the o-ring axis, wherein element (31) comprises abradable material layer with sealing surface section (31p) configured to interact with said movable ridge, characterized in that a layer of abradable material on said surface portion (31p) comprises, in axial direction, first zone (31p1) with first ridge penetration resistance, wherein said first zone (31p1) corresponds to the axial position of the ridge during the turbine rated operation, and second zone (31p2), adjacent to first zone (31p1), with less resistance to penetration of the ridge than in the first zone, wherein said second zone (31p2) is at the outlet relative to first region (31p1) and corresponds to the axial position, which the ridge occupies when flame extinction occurs in the engine combustion chamber.

EFFECT: solution allows avoiding rotor wedging in case of self-extinguishing combustion chamber without reducing engine efficiency during normal operation.

12 cl, 6 dwg