High temperature seals for blanketless inner fixed structure

1. A seal cooling arrangement comprising:

an inner fixed structure (IFS) comprising an upper bifurcation wall portion, a lower bifurcation wall portion, and an inner barrel portion formed between the upper bifurcation wall portion and the lower bifurcation wall portion, wherein an inner surface of the IFS is directly exposed to thermal loads from an engine;

a ceramic matrix composite (CMC) member coupled to the inner surface of the IFS;

a seal retainer coupled to the CMC member, wherein the CMC member is configured to thermally insulate the seal retainer from the IFS; and

an IFS seal coupled to the seal retainer,

wherein the CMC member comprises a width corresponding to a dimension of the seal retainer, and

the CMC member comprises a thickness configured to separate the seal retainer from the IFS.

2. The seal cooling arrangement of claim 1 , wherein the CMC member comprises an oxide CMC.

3. The seal cooling arrangement of claim 2 , further comprising a fastener configured to couple at least one of the seal retainer and the CMC member to the IFS.

4. The seal cooling arrangement of claim 3 , wherein the IFS seal comprises a base portion and a slot disposed in the base portion configured to prevent contact between the fastener and the IFS seal.

5. The seal cooling arrangement of claim 2 , wherein the IFS seal comprises an upper bifurcation seal configured to form a seal between a pylon and the IFS, the CMC member coupled to the upper bifurcation wall portion.

6. The seal cooling arrangement of claim 5 , wherein the CMC member comprises a thermal conductivity of between 0.15 BTU/hr-ft-F and 0.35 BTU/hr-ft-F at 600° F. (0.26 W/mK and 0.61 W/mK at 316° C.).

7. The seal cooling arrangement of claim 6 , wherein the CMC member comprises an aluminosilicate fiber.

8. The seal cooling arrangement of claim 2 , wherein the CMC member is bonded to at least one of the seal retainer and the IFS.

9. A method for thermally insulating an inner fixed structure (IFS) seal comprising:

disposing a ceramic matrix composite (CMC) member between an inner surface of an IFS and a seal retainer; and

separating, by the CMC member, the IFS from the seal retainer,

wherein the CMC member comprises a width corresponding to a dimension of the seal retainer,

the CMC member comprises a thickness configured to separate the seal retainer from the IFS,

the CMC member is configured to thermally insulate the seal retainer from the IFS, and

the IFS comprises an upper bifurcation wall portion, a lower bifurcation wall portion, and an inner barrel portion formed between the upper bifurcation wall portion and the lower bifurcation wall portion, wherein the inner surface of the IFS is directly exposed to thermal loads from an engine.

10. The method of claim 9 , wherein the IFS seal comprises an upper bifurcation seal configured to form a seal between a pylon and the IFS, the CMC member coupled to the upper bifurcation wall portion.

11. The method of claim 10 , wherein the CMC member is configured to prevent a thermal load from being transferred from the IFS to the IFS seal.

12. The method of claim 11 , wherein the thickness of the CMC member comprises between 0.2 inches and 1 inch.

13. The method of claim 12 , wherein the CMC member comprises a thermal conductivity of between 0.15 BTU/hr-ft-F and 0.35 BTU/hr-ft-F at 600° F. (0.26 W/mK and 0.61 W/mK at 316° C.).

14. The method of claim 13 , wherein the CMC member comprises an aluminosilicate fiber.

15. A method for thermally insulating an inner fixed structure (IFS) seal comprising:

receiving, by an IFS, a thermal load from an engine; and

thermally insulating, by a CMC member, the thermal load from a seal retainer,

wherein the CMC member comprises a width corresponding to a dimension of the seal retainer,

the CMC member comprises a thickness configured to separate the seal retainer from the IFS, and

the CMC member is configured to thermally insulate the seal retainer from the IFS, and

the IFS comprises an upper bifurcation wall portion, a lower bifurcation wall portion, and an inner barrel portion formed between the upper bifurcation wall portion and the lower bifurcation wall portion, wherein an inner surface of the IFS is directly exposed to the thermal load.

16. The method of claim 15 , wherein the CMC member comprises an oxide CMC.

17. The method of claim 16 , wherein the IFS seal comprises an upper bifurcation seal configured to form a seal between a pylon and the IFS, the CMC member coupled to the upper bifurcation wall portion.

18. The method of claim 17 , wherein the thickness of the CMC member comprises between 0.2 inches and 1 inch.

19. The seal cooling arrangement of claim 1 , wherein the IFS is blanketless.