Axial turbomachine compressor outer casing with seal
AssigneeTechspace Aero S.A.
InventorsJean-Francois Cortequisse, Philippe Minot
Life of this patent
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Abstract
The invention relates to an axial turbomachine compressor outer casing. The casing comprises a sealing device collaborating with a row of rotor blades. The casing comprises a wall with an annular groove in which the sealing device is housed. The sealing device comprises a segmented outer shroud and a plurality of piezoelectric actuators moving the shroud radially in the groove so as to open or close the functional clearance. The invention also proposes a method for controlling a sealing device for a turbojet engine, the method comprising a step of measuring the altitude and a step of adjusting a clearance according to the altitude.
Claims20
An outer casing of an axial turbomachine, the outer casing comprising:
- a circular wall comprising an inner annular groove with an annular bottom;
- an outer sealing shroud arranged at least partially in the groove and structured and operable to provide sealing between the outer casing and an annular row of blades of the turbomachine;
- at least one piezoelectric actuator connecting the outer shroud to the annular bottom of the circular wall and structured and operable to move the shroud in order to alter a clearance between the shroud and the rotor blades,
- the outer shroud comprising an inner annular smooth surface and an outer annular smooth surface radially opposed to the inner annular smooth surface and in contact with the piezoelectric actuators.
A turbomachine comprising a rotor with an annular blade row, and an outer casing encircling said annular blade row, said outer casing comprising:
- a circular wall comprising an inner annular groove;
- an outer sealing shroud arranged at least partially in the groove and structured and operable to provide sealing between the outer casing and an annular row of rotor blades of the turbomachine,
- at least one piezoelectric actuator radially between the outer shroud and the wall and structured and operable to connect them and to alter the radial clearance between the shroud and the rotor blades,
- the outer shroud comprising a constant radial thickness portion in contact with one of the piezoelectric actuators.
A method for controlling a device for sealing the outer casing of an axial turbomachine, the device comprising a mobile outer shroud defining a radial clearance around an annular row of rotor blades of the turbomachine, wherein the method comprises:
- determining the altitude of the turbomachine;
- and
- adjusting the clearance according to the altitude.
Dependencies are inferred from the claim text.