Fabric seal and assembly for gas turbine engine
A vane assembly for a gas turbine engine is disclosed in this paper. The vane assembly includes an inner platform, an outer platform, and a ceramic-containing airfoil. The ceramic-containing airfoil extends from the inner platform to the outer platform. A clamp mechanism couples the inner platform and the outer platform to the ceramic-containing airfoil.
1. A fabric seal for sealing between components of a gas turbine engine, the fabric seal comprising
a number of free tows each having a length and extending to a free end, and
a number of cross tows each extending across the length of the free tows and woven together therewith,
wherein the fabric seal defines a seal aperture, and the free ends of the free tows terminate within the seal aperture to provide a fringe and are configured for compliant contact with a component of a gas turbine engine inserted into the seal aperture to provide fluid sealing around the component.
2. The fabric seal of claim 1 , wherein the fringe defines a negative airfoil shape.
3. The fabric seal of claim 2 , wherein the cross tows extend along the profile of the negative airfoil shape and the free tows extend inwardly towards the aperture.
4. The fabric seal of claim 1 , wherein the fabric seal comprises ceramic fibers.
5. The fabric seal of claim 1 , wherein a plurality of the free tows and a plurality of the cross tows are woven together into a first sheet, and another plurality of the free tows and another plurality of the cross tows are woven together into a second sheet, and the first and second sheets are configured in a stacked arrangement.
6. The fabric seal of claim 5 , wherein the seal aperture is defined through each of the first and second sheets.
7. The fabric seal of claim 1 , wherein each free end of the free tows defines a loop within the aperture.
8. An assembly adapted for use in a gas turbine engine the assembly comprising
a first component defining a receiving space,
a second component comprising ceramic matrix materials and arranged to extend into the receiving space, and
a fabric seal defining a seal aperture and having tows that extend into the seal aperture, the tows each including a free end,
wherein the second component is arranged to extend through the seal aperture and contacts the free ends of the tows of the fabric seal to seal against fluid passing between the first and second components.
9. The assembly of claim 8 , wherein the second component is an airfoil vane of the gas turbine engine.
10. The assembly of claim 9 , wherein a fringe defines a negative airfoil shape smaller than a cross-section of the airfoil vane.
11. The assembly of claim 10 , wherein the first component is an inner band of the gas turbine engine and the receiving space is configured to receive the airfoil vane for connection to the inner band.
12. The assembly of claim 11 , wherein the airfoil vane includes a vane body for contacting combustion exhaust gases and a connection protrusion that extends into the receiving space of the first component, the vane body having a radially inward face.
13. The assembly of claim 12 , wherein the fabric seal abuts the radially inward face of the vane body and the fringe of the fabric seal contacts an outer surface of the connection protrusion.
14. The assembly of claim 11 , wherein the airfoil vane includes an inner spar and an outer shell disposed on the inner spar for contacting combustion exhaust gases, and a radially inward end of the airfoil vane including a portion of both the inner spar and the outer shell is inserted into the receiving space, and the fringe of the fabric seal is disposed in contact with the portion of the outer shell inserted into the receiving space.
15. The assembly of claim 9 , wherein the first turbine component is an outer band including a receptacle configured to receive the airfoil vane.
16. The assembly of claim 15 , wherein the airfoil vane includes an inner spar and an outer shell disposed on the inner spar for contacting combustion exhaust gases, and a radially outward end of the airfoil vane including a portion of both the inner spar and the outer shell is inserted into the receptacle, and a fringe of the fabric seal is disposed in contact with the portion of the outer shell inserted into the receptacle, and the outer fabric seal contacts a biasing member to provide resilient biasing of the fabric seal.
17. The assembly of claim 8 , wherein tows of the fabric seal are free tows and the fabric seal includes cross tows, and a plurality of the free tows and a plurality of the cross tows are woven together into a first sheet, and another plurality of the free tows and another plurality of the cross tows woven together into a second sheet, and the first and second sheets are arranged in a stacked arrangement and the seal aperture is defined through each of the first and second sheets.
18. The assembly of claim 8 , wherein each free end of the tows defines a loop.
19. A method of sealing components of a gas turbine engine, the method comprising
positioning a fabric seal including a number of tows each having free ends arranged within a seal aperture defined by the fabric seal such that the fabric seal is in contact with a first component of the gas turbine engine,
positioning a second component of the gas turbine component in contact with the free ends of the fabric seal, and
driving the second component through the seal aperture into an operable position such that the free end of at least one of the tows of the fabric seal is distorted to maintain contact with the second component to provide fluid sealing.
20. The method of claim 19 , wherein the second turbine component is an airfoil vane of the gas turbine engine.