Thermal Shield at Casing Joint

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 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 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 the 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 engine casing structures;
• and
• a 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 engine casing structures.

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 the 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 engine casing structures.