초록 ▼

A thermal shield for reducing thermal stress induced proximate to a first joint formed between adjacent engine casing components in a gas turbine engine. The thermal shield includes a cover structure for covering a radially inner portion of at least one of the engine casing components. The cover str

A thermal shield for reducing thermal stress induced proximate to a first joint formed between adjacent engine casing components in a gas turbine engine. The thermal shield includes a cover structure for covering a radially inner portion of at least one of the engine casing components. The cover structure is disposed proximate to the first joint and attached to the respective engine casing component so as to limit exposure of a covered inner portion of the engine casing component to hot gases in an interior volume defined by the engine casing components. A thermally insulating layer is disposed between the cover structure and the engine casing component for effecting a reduced amount of heat transfer to the covered inner portion of the engine casing component from the hot gases in the interior volume defined by the engine casing components.

대표청구항 ▼

1. A thermal shield for reducing thermal stress induced proximate to a first joint formed between adjacent engine casing components in a gas turbine engine, the thermal shield comprising: a cover structure for covering a radially inner portion of at least one of the engine casing components, said co

1. A thermal shield for reducing thermal stress induced proximate to a first joint formed between adjacent engine casing components in a gas turbine engine, the thermal shield comprising: a cover structure for covering a radially inner portion of at least one of the engine casing components, said cover structure disposed proximate to the first joint and attached to a radially inner side of a respective engine casing component so as to limit exposure of the covered inner portion of the respective engine casing component to hot gases in an interior volume defined by the engine casing components; anda thermally insulating layer between said cover structure and the covered inner portion of the respective engine casing component, said thermally insulating layer effecting a reduced amount of heat transfer to the covered inner portion of the respective engine casing component from the hot gases in the interior volume defined by the engine casing components. 2. The thermal shield according to claim 1, wherein said thermally insulating layer comprises a thermal blanket. 3. The thermal shield according to claim 2, wherein said thermal blanket comprises a compressible material. 4. The thermal shield according to claim 2, wherein said thermal blanket comprises a fibrous material. 5. The thermal shield according to claim 1, wherein said thermally insulating layer comprises substantially the same axial and circumferential shape as said cover structure. 6. The thermal shield according to claim 1, wherein said thermally insulating layer is oversized in a radial direction such that there is no gap having a dimension in the radial direction between said thermally insulating layer and said cover structure and such that there is no gap having a dimension in the radial direction between said thermally insulating layer and the respective engine casing component. 7. The thermal shield according to claim 1, wherein the first joint is a circumferentially extending joint between a compressor/combustor casing component and a turbine casing component. 8. The thermal shield according to claim 1, wherein said cover structure is attached to said radially inner side of the respective engine casing component proximate to a second joint, said second joint comprising an axial joint that is formed between adjacent circumferential casing components. 9. The thermal shield according to claim 8, wherein the adjacent circumferential casing components cooperate to form one of a compressor/combustor casing component and a turbine casing component. 10. The thermal shield according to claim 1, wherein the engine casing components form a pair of axially adjacent, generally cylindrical walls about a longitudinal axis of the gas turbine engine, each of said cylindrical walls defining an inner surface and an outer surface, the covered inner portion comprising at least one of said inner surfaces. 11. The thermal shield according to claim 1, wherein said cover structure comprises a generally rectangular member elongated in a circumferential direction. 12. An engine casing for use in a gas turbine engine comprising: two axially adjacent engine casing structures cooperating to form a substantially cylindrical member defining an interior volume therein, each engine casing structure comprised of at least one circumferential engine casing component, wherein a circumferentially extending joint is formed between said two axially adjacent engine casing structures;at least one thermal shield for reducing thermal stress induced on a portion of at least one of said engine casing components of said two axially adjacent engine casing structures proximate to said circumferentially extending joint, said thermal shield comprising:a cover structure for covering a radially inner portion of said at least one of said engine casing components, said cover structure disposed proximate to said circumferentially extending joint and attached to a radially inner side of a respective engine casing component so as to limit exposure of the covered inner portion of the respective engine casing component to hot gases in said interior volume defined by said two axially adjacent engine casing structures; anda thermally insulating layer between said cover structure and the covered inner portion of the respective engine casing component, said thermally insulating layer effecting a reduced amount of heat transfer to the covered inner portion of the respective engine casing component from the hot gases in said interior volume defined by said two axially adjacent engine casing structures. 13. The engine casing according to claim 12, wherein said thermally insulating layer comprises a thermal blanket formed from a compressible, fibrous material. 14. The engine casing according to claim 12, wherein said thermally insulating layer comprises substantially the same axial and circumferential shape as said cover structure and is oversized in a radial direction such that there is no gap having a dimension in the radial direction between said thermally insulating layer and said cover structure and such that there is no gap having a dimension in the radial direction between said thermally insulating layer and the respective engine casing component. 15. The engine casing according to claim 12, wherein said two axially adjacent engine casing structures comprise a compressor/combustor casing component and a turbine casing component. 16. The engine casing according to claim 12, wherein said cover structure is attached to said radially inner side of the respective engine casing component proximate to a second joint, said second joint comprising an axial joint that is formed between adjacent circumferential casing components. 17. The engine casing according to claim 12, wherein said engine casing components form a pair of axially adjacent, generally cylindrical walls about a longitudinal axis of the gas turbine engine, each of said cylindrical walls defining an inner surface and an outer surface, the covered inner portion comprising at least one of said inner surfaces. 18. An engine casing for use in a gas turbine engine comprising: a first engine casing structure comprising at least two first engine casing components, wherein an axially extending joint is formed between each of said first engine casing components;a second engine casing structure disposed axially adjacent to said first engine casing structure and comprising at least two second engine casing components, wherein an axially extending joint is formed between each of said second engine casing components, said first and second engine casing structures cooperating to define an interior volume therein, wherein a circumferentially extending joint is formed between said first and second engine casing structures;wherein each of said first engine casing components and each of said second engine casing components has a respective thermal shield associated with it for reducing thermal stress induced on said first and second engine casing components, each of said thermal shields comprising:a cover structure for covering a radially inner portion of the respective engine casing component, said cover structure disposed proximate to said circumferentially extending joint between said first and second engine casing structures and also proximate to said axially extending joint between the respective engine casing components, said cover structure attached to a radially inner side of a respective engine casing component so as to limit exposure of the covered inner portion of the respective engine casing component to hot gases in said interior volume defined by said first and second engine casing structures. 19. The engine casing according to claim 18, including a thermally insulating layer between each said cover structure and the covered inner portion of the respective engine casing component, said thermally insulating layer effecting a reduced amount of heat transfer to the covered inner portion of the respective engine casing component from the hot gases in said interior volume defined by said first and second engine casing structures, said thermally insulating layer comprising a thermal blanket formed from a compressible, fibrous material, said thermal blanket comprising substantially the same axial and circumferential shape as said cover structure and being oversized in a radial direction such that there is no gap having a dimension in the radial direction between said thermal blanket and said cover structure and such that there is no gap having a dimension in the radial direction between said thermal blanket and the respective engine casing component. 20. The engine casing according to claim 18, wherein said first engine casing structure comprises a compressor/combustor casing and said second engine casing structure comprises a turbine casing structure.