Multi-ply seal

Abstract

A seal may comprise a first ply including an annular shape and a second ply including a discontinuous annular shape having an axial split. The second ply may be positioned adjacent to a surface of the first ply.

What is claimed is: 
     
       1. A seal, comprising:
 a first ply having a circumferentially continuous annular shape; 
 a second ply having a circumferentially discontinuous annular shape including an axial split, the second ply positioned directly adjacent to at least one of an inner diameter surface or an outer diameter surface of the first ply; and 
 a third ply positioned adjacent to at least one of the first ply or the second ply, the third ply having a circumferentially discontinuous annular shape. 
 
     
     
       2. The seal of  claim 1 , wherein the first ply and the second ply comprise a “W” seal. 
     
     
       3. The seal of  claim 2 , wherein the second ply is nested within the first ply with an inner diameter surface of the second ply in contact with the outer diameter surface of the firstply. 
     
     
       4. The seal of  claim 1 , wherein the first ply comprises a first sheet metal and the second ply comprises a second sheet metal. 
     
     
       5. The seal of  claim 1 , wherein the first ply is comprised of a first material and the second ply is comprised of a second material, and wherein at least one of the first material or the second material comprises a nickel-based alloy. 
     
     
       6. The seal of  claim 5 , wherein the first material and the second material comprise the same material. 
     
     
       7. An engine section of a gas turbine engine, comprising:
 a first engine component; 
 a second engine component disposed adjacent to the first engine component; and 
 a seal disposed between the first engine component and the second engine component, the seal comprising:
 a first ply having a circumferentially continuous annular shape, 
 a second ply having a circumferentially discontinuous annular shape including an axial split, the second ply positioned directly adjacent to at least one of an inner diameter surface or an outer diameter surface of the first ply; and 
 a third ply positioned adjacent to at least one of the first ply or the second ply, the third ply having a circumferentially discontinuous annular shape. 
 
 
     
     
       8. The engine section of  claim 7 , wherein the first ply and the second ply comprise a “W” seal. 
     
     
       9. The engine section of  claim 8 , wherein the second ply is nested within the first ply with an inner diameter surface of the second ply in contact with the outer diameter surface of the first ply. 
     
     
       10. The engine section of  claim 7 , wherein the second ply is mechanically loaded against the at least one of an inner diameter surface or an outer diameter surface of the first ply. 
     
     
       11. The engine section of  claim 7 , wherein the first ply is comprised of a first material and the second ply is comprised of a second material, and wherein at least one of the first material or the second material comprises a nickel-based alloy. 
     
     
       12. The engine section of  claim 11 , wherein the first material and the second material comprise the same material. 
     
     
       13. The engine section of  claim 11 , wherein the second material has a greaterwear resistance than the first material. 
     
     
       14. The engine section of  claim 7 , wherein the first ply comprises a first sheet metal and the second ply comprises a second sheet metal. 
     
     
       15. A gas turbine engine, comprising:
 an engine section comprising at least one of a compressor section or a turbine section, the engine section comprising:
 a blade outer air seal, 
 a vane adjacent to the blade outer air seal, and 
 a seal disposed between the blade outer air seal and the vane, the seal comprising:
 a first ply having a circumferentially continuous annular shape; 
 a second ply having a circumferentially discontinuous annular shape including an axial split, the second ply positioned directly adjacent to at least one of an inner diameter surface or an outer diameter surface of the first ply; and 
 a third ply positioned adjacent to at least one of the first ply or the second ply, the third ply having a circumferentially discontinuous annular shape. 
 
 
 
     
     
       16. The gas turbine engine of  claim 15 , wherein the first ply and the second ply comprise a “W” seal. 
     
     
       17. The gas turbine engine of  claim 16 , wherein the second ply is nested within the first ply with an inner diameter surface of the second ply in contact with the outer diameter surface of the first ply. 
     
     
       18. The gas turbine engine of  claim 17 , wherein the second ply is mechanically loaded against the outer diameter surface of the first ply. 
     
     
       19. The gas turbine engine of  claim 15 , wherein the first ply is comprised of a first material and the second ply is comprised of a second material and wherein at least one of the first material or the second material comprises a nickel-based alloy.