Platform seal
A gas turbine engine includes a plurality of airfoil vanes situated in a circumferential row about an engine central axis. Each of the plurality of airfoil vanes include a first platform, and a second platform, and an airfoil section therebetween. A face of the first platform includes a trailing edge recess and a leading edge recess. The trailing edge recess and leading edge recesses of adjacent ones of the first platforms together define a slot. A sealing element situated in each slot. The sealing element has a geometry that tracks the geometry of the slot such that the seal is trapped in the slot by a form-fit relationship in circumferential and axial dimensions by a form-fit relationship between the sealing element and the slot. A method of sealing a plurality of airfoil vanes is also disclosed.
1. A gas turbine engine, comprising:
a plurality of airfoil vanes situated in a circumferential row about an engine central axis, each of the plurality of airfoil vanes including a first platform, and a second platform, and an airfoil section therebetween, wherein a face of the first platform includes a trailing edge recess and a leading edge recess, and the trailing edge recess and leading edge recesses of adjacent ones of the first platforms together define a slot;
a sealing element situated in each slot, the sealing element having a geometry that tracks the geometry of the slot such that the seal is trapped in the slot by a form-fit relationship in circumferential and axial dimensions by a form-fit relationship between the sealing element and the slot; and
a support ring configured to support each first platform, the support ring including a plurality of pedestals corresponding to each slot and configured to retain the sealing elements in the slots in a radial direction.
2. The gas turbine engine of claim 1 , wherein the first platform is a radially outer platform and the support ring is connected to an engine casing structure by a plurality of lugs.
3. The gas turbine engine of claim 2 , wherein the sealing elements includes one or more legs configured to engage the plurality of lugs.
4. The gas turbine engine of claim 1 , wherein each slot includes first and second portions, the first portion formed in a leading edge of each outer platform and the second portion formed in a trailing edge of each outer platform.
5. The gas turbine engine of claim 4 , wherein the first portion is defined by a radial face and a circumferential face, and the circumferential face forms an obtuse angle with the radial face.
6. The gas turbine engine of claim 5 , wherein the sealing element includes a main body portion and a biased portion extending from the main body portion at an angle that corresponds to the obtuse angle.
7. The gas turbine engine of claim 6 , further comprising a support ring configured to support each platform, the support ring including a plurality of pedestals, wherein each pedestal includes a biased portion that corresponds to the radial face, the biased portion of the each pedestal configured to bias the biased portion of each sealing element against the radial face.
8. The gas turbine engine of claim 7 , wherein each pedestal includes a cooling hole configured to transmit cooling air through the support ring into each slot against each sealing element.
9. The gas turbine engine of claim 4 , wherein the second portion is defined by a radial face and a circumferential face, and the circumferential face is generally perpendicular to the radial face.
10. The gas turbine engine of claim 1 , wherein each sealing element is formed of a ductile metallic material.
11. A method of sealing a plurality of airfoil vanes, comprising:
situating a sealing element in a slot formed in a face of platforms of adjacent airfoil vanes, wherein the sealing element has a geometry that tracks the geometry of the slot such that the sealing element is trapped in the slot in circumferential and axial dimension by a form-fit relationship between the sealing element and the slot; and
supporting the platforms in a support ring, the support ring including a pedestal that is configured to be received in the slot and retain the sealing element in the slot in a radial dimension.
12. The method of claim 11 , further comprising providing cooling air to the slot and against the sealing element via a cooling hole in the pedestal.
13. The method of claim 11 , wherein the slot includes first and second portions, the first portion formed in a leading edge of a platform of the adjacent outer platforms and the second portion formed in a trailing edge of the other platform of the adjacent outer platforms.
14. The method of claim 13 , wherein the first portion is defined by a radial face and a circumferential face, and the circumferential face forms an obtuse angle with the radial face.
15. The method of claim 14 , wherein the sealing element includes a main body portion and a biased portion extending from the main body portion at an angle that corresponds to the obtuse angle.
16. The method of claim 15 , further comprising supporting the platforms in a support ring, the support ring including a pedestal that is configured to retain the sealing element in the slot.
17. The method of claim 16 , wherein the pedestal includes a biased portion that corresponds to the circumferential face, the biased portion configured to trap the biased portion of the sealing element against the circumferential face.
18. The method of claim 11 , wherein each sealing element is formed of a ductile metallic material.
19. A gas turbine engine, comprising:
a plurality of airfoil vanes situated in a circumferential row about an engine central axis, each of the plurality of airfoil vanes including a first platform, and a second platform, and an airfoil section therebetween, wherein a face of the first platform includes a trailing edge recess and a leading edge recess, and the trailing edge recess and leading edge recesses of adjacent ones of the first platforms together define a slot;
a sealing element situated in the slot of each of the plurality of airfoil vanes, the sealing element having a geometry that tracks the geometry of the slot such that the sealing element is trapped in the slot by a form-fit relationship in circumferential and axial dimensions by a form-fit relationship between the sealing element and the slot; and
a support ring configured to support the first platform of each of the plurality of airfoil vanes, the support ring including a plurality of pedestals corresponding to the slot of each of the plurality of airfoil vanes and configured to retain the sealing elements in the slots in a radial direction.
20. The gas turbine engine of claim 19 , wherein the slot of each of the plurality of airfoil vanes includes first and second portions, the first portion formed in a leading edge of the outer platform of each of the plurality of airfoil vanes and the second portion formed in a trailing edge of the outer platform.