Patent Grant
12158072
The present disclosure relates generally to turbine shroud segments, and more specifically to sealing turbine shroud segments used with gas turbine engines.
Gas turbine engines are used to power aircraft, watercraft, power generators, and the like. Gas turbine engines typically include a compressor, a combustor, and a turbine. The compressor compresses air drawn into the engine and delivers high pressure air to the combustor. In the combustor, fuel is mixed with the high pressure air and is ignited. Products of the combustion reaction in the combustor are directed into the turbine where work is extracted to drive the compressor and, sometimes, an output shaft. Left-over products of the combustion are exhausted out of the turbine and may provide thrust in some applications.
Compressors and turbines typically include alternating stages of static vane assemblies and rotating wheel assemblies. The rotating wheel assemblies include disks carrying blades around their outer edges. When the rotating wheel assemblies turn, tips of the blades move along blade tracks included in static shrouds that are arranged around the rotating wheel assemblies. Such static shrouds may be coupled to an engine case that surrounds the compressor, the combustor, and the turbine.
Some shrouds are made up of a number of segments arranged circumferentially adjacent to one another to form a ring. Such shrouds may include sealing elements between segments to block air from leaking through the segments during operation of the gas turbine engine.
The present disclosure may comprise one or more of the following features and combinations thereof.
A turbine shroud assembly for use with a gas turbine engine may comprise a first shroud segment, a second shroud segment, and a damping strip seal. The first shroud segment may include a first carrier segment and a first blade track segment. The first carrier segment may be arranged circumferentially at least partway around a central axis. The first blade track segment may be supported by the first carrier segment to define a portion of a gas path of the turbine shroud assembly. The first carrier segment may have a first outer wall, a first flange, and a second flange. The first flange may extend radially inward from the first outer wall. The second flange may be axially spaced apart from the first flange and may extend radially inward from the first outer wall. The second shroud segment may be arranged circumferentially adjacent the first shroud segment about the central axis. The second shroud segment may include a second carrier segment and a second blade track segment. The second blade track segment may be supported by the second carrier segment to define another portion of the gas path of the turbine shroud assembly. The second carrier segment may have a second outer wall, a first flange, and a second flange. The first flange may extend radially inward from the second outer wall. The second flange may be axially spaced apart from the first flange of the second carrier segment and may extend radially inward from the second outer wall.
In some embodiments, the damping strip seal may extend circumferentially into the first shroud segment and the second shroud segment to block gases from passing radially between the first shroud segment and the second shroud segment. The damping strip seal may have a body segment, a first end portion, and a second end portion. The body segment may extend axially along a first radial outer surface of the first blade track segment and a second radial outer surface of the second blade track segment. The first end portion may extend along a first curvilinear path radially outward and axially aft from a first axial end of the body segment. The second end portion may extend along a second curvilinear path radially outward and axially forward from a second axial end of the body segment. The first end portion of the damping strip seal may engage the first flange of the first carrier segment and the second end portion of the damping strip seal may engage the second flange of the first carrier segment to urge the body segment of the damping strip seal radially inward against the first blade track segment and the second blade track segment to dampen flutter movement of the damping strip seal.
In some embodiments, the damping strip seal may be integrally formed as a single, one-piece component. The first flange of the first carrier segment may be formed to include a first seal-retaining recess that is defined by a first circumferentially-extending face, a second circumferentially-extending face located axially opposite the first circumferentially-extending face, and an axially-extending face that extends between and interconnects the first circumferentially-extending face and the second circumferentially-extending face. The first flange of the second carrier segment may be formed to include a second seal-retaining recess that is defined by a first circumferentially-extending face, a second circumferentially-extending face located axially opposite the first circumferentially-extending face, and an axially-extending face that extends between and interconnects the first circumferentially-extending face and the second circumferentially-extending face. A first height of the first seal-retaining recess may be less than a second height of the second seal-retaining recess. The first end portion of the damping strip seal may contact the axially-extending face of the first seal-retaining recess without contacting the axially-extending face of the second seal-retaining recess.
In some embodiments, the first flange of the second carrier segment may be formed to include a second seal-retaining recess that is defined by a first circumferentially-extending face, a second circumferentially-extending face located axially opposite the first circumferentially-extending face, and an axially-extending face that extends between and interconnects the first circumferentially-extending face and the second circumferentially-extending face. A first height of the first seal-retaining recess may be equal to a second height of the second seal-retaining recess. The first end portion of the damping strip seal may contact the axially-extending face of the first seal-retaining recess without contacting the axially-extending face of the second seal-retaining recess.
In some embodiments, the first blade track segment may include a first shroud wall and a first attachment feature. The first shroud wall may extend circumferentially partway around the central axis. The first attachment feature may extend radially outward from the first shroud wall. A circumferential end of the first shroud wall may be formed with a first recess to define a first shoulder that provides the first radial outer surface of the first blade track segment. The second blade track segment may include a second shroud wall that extends circumferentially partway around the central axis and a second attachment feature. The second attachment feature may extend radially outward from the second shroud wall. A circumferential end of the second shroud wall may be formed with a second recess to define a second shoulder that provides the second radial outer surface of the second blade track segment. The body segment of the damping strip seal may engage the first shoulder and the second shoulder.
In some embodiments, the first flange of the first carrier segment may include a first wall and a first protrusion that extends radially inward from the first wall to cover a first axial end of the first blade track segment. The first wall may be formed to include a radial inward facing surface and a first seal-retaining recess may extend radially outward into the first flange from the radially inward facing surface. The first carrier segment may include a third flange and a fourth flange. The third flange may extend radially inward from the first outer wall. The fourth flange may be axially spaced apart from the third flange and may extend radially inward from the first outer wall. The third flange may be located axially between the first flange and the fourth flange. The fourth flange may be located axially between the third flange and the second flange. The first blade track segment may include a first shroud wall, a first attachment flange, and a second attachment flange. The first shroud wall may extend circumferentially partway around the central axis. The first attachment flange may extend radially outward from the first shroud wall. The second attachment flange may be spaced apart axially aft from the first attachment flange and may extend radially outward from the first shroud wall.
In some embodiments, the first shroud segment may include a first retainer that extends through the first carrier segment and the first blade track segment so as to couple the first blade track segment to the first carrier segment. The second flange of the first carrier segment may be formed to include a third seal-retaining recess to receive the second end portion of the damping strip seal therein.
According to another aspect of the present disclosure, a turbine shroud assembly for use with a gas turbine engine may comprise a first shroud segment, a second shroud segment, and a damping strip seal. The first shroud segment may include a first carrier segment and a first blade track segment. The first carrier segment may be arranged circumferentially at least partway around a central axis. The first blade track segment may be supported by the first carrier segment to define a portion of a gas path of the turbine shroud assembly. The first carrier segment may have having an outer wall, a first flange, and a second flange. The first flange may extend radially inward from the outer wall. The second flange may be axially spaced apart from the first flange and may extend radially inward from the outer wall. The second shroud segment may include a second carrier segment arranged circumferentially at least partway around a central axis and a second blade track segment supported by the second carrier segment.
In some embodiments, the damping strip seal may have a body segment, a first end portion, and a second end portion. The body segment may engage a radial outer surface of the first blade track segment. A first end portion may extend radially outward from a first end of the body segment and may engage the first flange. A second end portion may extend radially outward from a second end of the body segment and may engage the second flange to urge the body segment radially inward toward the radial outer surface of the first blade track segment. The damping strip seal may be integrally formed as a single, one-piece component.
In some embodiments, the first end portion of the damping strip seal may be formed to include a radially-extending portion that extends radially outward from the first end of the body segment and an axially-extending portion that extends axially aft from the radially-extending portion to form a first curvilinear path. The second end portion of the damping strip seal may be formed to include a radially-extending portion that extends radially outward from the second end of the body segment and an axially-extending portion that extends axially forward from the radially-extending portion to form a second curvilinear path. The first flange may be formed to include a first seal-retaining recess that is defined by a first circumferentially-extending face, a second circumferentially-extending face located axially opposite the first circumferentially-extending face, and an axially-extending face that extends between and interconnects the first circumferentially-extending face and the second circumferentially-extending face. The axially-extending portion of the first end portion of the damping strip seal may contact the axially-extending face of the first seal-retaining recess.
In some embodiments, the body segment of the damping strip seal may have a first width. At least a portion of the first end portion may have a second width. The first width of the body segment may be greater than the second width of the at least a portion of the first end portion. The body segment of the damping strip seal may have a first width. The first end portion may have a second width. The first width of the body segment may be substantially similar to the second width of the first end portion.
In some embodiments, the first blade track segment may include a shroud wall that extends circumferentially partway around the central axis and an attachment feature that extends radially outward from the shroud wall. A circumferential end of the shroud wall may be formed with a recess to define a shoulder that provides the radial outer surface of the first blade track segment. The body segment of the damping strip seal may engage the shoulder. The first carrier segment may include a third flange that extends radially inward from the outer wall and a fourth flange axially spaced apart from the third flange and extending radially inward from the outer wall. The third flange may be located axially between the first flange and the fourth flange. The fourth flange may be located axially between the third flange and the second flange. The first blade track segment may include a shroud wall, a first attachment flange, and a second attachment flange. The shroud wall may extend circumferentially partway around the central axis. The first attachment flange may extend radially outward from the shroud wall. The second attachment flange may be spaced apart axially aft from the first attachment flange that extends radially from the shroud wall. The first shroud segment may further include a first retainer that extends through the first carrier segment and the first blade track segment so as to couple the first blade track segment to the first carrier segment.
A method of assembling a turbine shroud assembly for use with a gas turbine engine may comprise assembling a first shroud segment by moving a first blade track segment into engagement with a first carrier segment and inserting a first retainer through the first blade track segment and the first carrier segment to couple the first blade track segment to the first carrier segment. The method may include assembling a second shroud segment by moving a second blade track segment into engagement with a second carrier segment and inserting a second retainer through the second blade track segment and the second carrier segment to couple the second blade track segment to the second carrier segment. The method may include providing a damping strip seal that includes a body segment, a first end portion extending radially outward from a first end of the body segment, and a second end portion extending radially outward from a second end of the body segment.
In some embodiments, the method may include sliding the body segment of the damping strip seal onto a first radial outer surface of the first blade track segment so that the first end portion of the damping strip seal engages a first flange of the first carrier segment and the second end portion of the damping strip seal engages a second flange of the first carrier segment. The method may include moving the second shroud segment toward the first shroud segment so that the second shroud segment is arranged circumferentially adjacent the first shroud segment and the body segment of the damping strip seal extends circumferentially between and axially along the first blade track segment and the second blade track segment.
In some embodiments, the method may include including locating the first end portion of the damping strip seal in a first seal-retaining recess formed in the first flange of the first carrier segment and in a third seal-retaining recess formed in a first flange of the second carrier segment and locating the second end portion of the damping strip seal in a second seal-retaining recess formed in the second flange of the first carrier segment and a fourth seal-retaining recess formed in a second flange of the second carrier segment. The method may include urging the body segment of the damping strip seal radially inward against the first blade track segment and the second blade track segment through engagement of the first end portion of the damping strip seal with the first seal-retaining recess and the second end portion of the damping strip seal with the second seal-retaining recess.
These and other features of the present disclosure will become more apparent from the following description of the illustrative embodiments.
For the purposes of promoting an understanding of the principles of the disclosure, reference will now be made to a number of illustrative embodiments illustrated in the drawings and specific language will be used to describe the same.
An illustrative aerospace gas turbine engine 10 includes a fan 12, a compressor 14, a combustor 16, and a turbine 18 as shown in
The turbine 18 includes at least one turbine wheel assembly 20 and a turbine shroud assembly 22 positioned to surround the turbine wheel assembly 20 as shown in
The turbine shroud assembly 22 includes a plurality of shroud segments and a plurality of strip seals between adjacent shroud segments as suggested in
The plurality of strip seals includes strip seals 102, 104, 106, 108, 110 as shown in
The second shroud segment 28 is arranged circumferentially adjacent the first shroud segment 26 about the central axis 11. A circumferential gap G is formed between the first shroud segment 26 and the second shroud segment 28 as shown in
The first shroud segment 26 includes a first carrier segment 32, a first blade track segment 34, and a first retainer 36 as shown in
The second shroud segment 28 includes a second carrier segment 38, a second blade track segment 40, and a second retainer 42 as shown in
The damping strip seal 30 extends circumferentially into the first shroud segment 26 and the second shroud segment 28 as suggested in
Fluttering of strip seals may be a concern in turbine shroud assemblies. Fluttering movement of a strip seal may reduce the life of the strip seal. To minimize fluttering, and thus, reduce the possibility of failure, the damping strip seal 30 of the present disclosure is urged radially against the blade track segments 34, 40 to dampen any flutter or vibration.
The damping strip seal 30 includes a body segment 44, a first end portion 46, and a second end portion 48 as shown in
Turning back to the first shroud segment 26, the first carrier segment 32 of the first shroud segment 26 includes a first outer wall 50, a first flange 52, and a second flange 54 as shown in
The first flange 52 is formed to include a first seal-retaining recess 60 as shown in
The first seal-retaining recess 60 receives the first end portion 46 of the damping strip seal 30 therein as shown in
The first flange 52 of the first carrier segment 32 includes a first wall 70 formed to include a radially inward facing surface 74 as shown in
The second flange 54 of the first carrier segment 32 is formed to include a second seal-retaining recess 76 as shown in
The second seal-retaining recess 76 receives the second end portion 48 of the damping strip seal 30 therein as shown in
In some embodiments, the first carrier segment 32 further includes a third flange 56 and a fourth flange 58 as shown in
Each of the flanges 52, 54, 56, and 58 of the first carrier segment 32 is formed to include a hole that receives the first retainer 36 therein as shown in
The first blade track segment 34 includes a first shroud wall 83 and a first attachment feature 85 that extends radially outward from the first shroud wall 83 as shown in
A circumferential end 34B of the first shroud wall 83 abuts the second blade track segment 40 as shown in
The body segment 44 of the damping strip seal 30 slides onto the first radial outer surface 90 of the first shoulder 88 as shown in
In the illustrative embodiment, the first retainer 36 includes two retainer assemblies 36A, 36B that each have a corresponding mount pin 37 and a corresponding mount plug 39 as shown in
The first retainer 36 couples the first blade track segment 34 to the first carrier segment 32 as shown in
In the illustrative embodiment, each mount pin 37 of each retainer assembly 36A, 36B includes a forward pin 41 and an aft pin 43 as shown in
The second carrier segment 38 of the second shroud segment 28 includes a second outer wall 92, a fifth flange 94, and a sixth flange 96 as shown in
The fifth flange 94 is formed to include a third seal-retaining recess 98 as shown in
The third seal-retaining recess 98 has a second height H2 (i.e., the first circumferentially-extending face 73, the second circumferentially-extending face, the second axially-extending face 77 have the second height H2). The first seal-retaining recess 60 and the third seal-retaining recess 98 are aligned with one another while the first shroud segment 26 and the second shroud segment 28 are assembled adjacent to one another as shown in
The fifth flange 94 of the second carrier segment 38 includes a second wall 79 formed to include a radially inward facing surface 81 as shown in
The sixth flange 96 of the second carrier segment 38 is formed to include a fourth seal-retaining recess 89 as suggested in
The second carrier segment 38 further includes a seventh flange 91 and an eighth flange 93 as shown in
Each of the flanges 94, 96, 91, and 93 of the second carrier segment 38 is formed to include a hole that receives the second retainer 42 therein. Illustratively, the second carrier segment 38 is made of metallic materials.
The second blade track segment 40 includes a second shroud wall 95 and a second attachment feature 97 that extends radially outward from the second shroud wall 95 as shown in
A circumferential end 40B of the second shroud wall 95 abuts the first blade track segment 34 as shown in
The second recess 99 of the second blade track segment 40 is substantially aligned with the second axially-extending face 77 of the third seal-retaining recess 98 as shown in
The damping strip seal 30 includes the body segment 44, the first end portion 46, and the second end portion 48 as shown in
The first recess 86 of the first blade track segment 34 and the second recess 99 of the second blade track segment 40 retain the damping strip seal 30 circumferentially between the first blade track segment 34 and the second blade track segment 40 as suggested in
The first end portion 46 extends along a first curvilinear path from a first axial end 44A of the body segment 44 as shown in
The first end portion 46 extends into both of the first seal-retaining recess 60 of the first carrier segment 32 and the third seal-retaining recess 98 of the second carrier segment 38 as shown in
The second end portion 48 extends along a second curvilinear path from a second axial end 44B of the body segment 44 as shown in
Though not specifically shown, the second end portion 48 is configured the same as the first end portion 46. The second end portion 48 extends into both of the second seal-retaining recess 76 of the first carrier segment 32 and the fourth seal-retaining recess 89 of the second carrier segment 38. The axially-extending portion 55 of the second end portion 48 contacts the first axially-extending face 82 of the second seal-retaining recess 76 as shown in
A space radially outward of the body segment 44 of the damping strip seal 30, such as the space axially between the third flange 56 and the fourth flange 58, is pressurized. Thus, a high load pushes downwardly on the body segment 44 at a center of the body segment 44 axially between the first axial end 44A and the second axial end 44B.
The seal-retaining recesses 60, 76, 98, 89 retain the damping strip seal 30 axially relative to the first shroud segment 26 and the second shroud segment 28 so that the damping strip seal 30 does not escape from the shroud segments 26, 28 fore and aft. The seal-retaining recesses 60, 76, 98, 89 also retain the damping strip seal 30 radially relative to the first shroud segment 26 and the second shroud segment 28.
The body segment 44 of the damping strip seal 30 has a first width W1 as shown in
In some embodiments, the turbine shroud assembly 22 further includes strip seals 102, 104, 106, 108, 110 as shown in
The first carrier segment 32 and the second carrier segment 38 are each formed to include grooves sized to receive the strip seals 102, 104, 106, 108 therein as shown in
Each circumferential side of the first carrier segment 32 is formed to include a drain hole 112 extending through a portion of the first carrier segment 32 as shown in
Another embodiment of a turbine shroud assembly 222 in accordance with the present disclosure is shown in
The turbine shroud assembly 222 includes a first shroud segment 226, a second shroud segment 228, and a damping strip seal 230 as shown in
The first shroud segment 226 includes a first carrier segment 232, a first blade track segment 234, and a first retainer (not shown, but the same as the first retainer 36) as shown in
A first flange 252 of the first carrier segment 232 is formed to include a first seal-retaining recess 260 as shown in
The first seal-retaining recess 260 has a third height H3 (i.e., the first circumferentially-extending face 262, the second circumferentially-extending face, the second axially-extending face 268 have the third height H3). A second flange of the first carrier segment 232 is formed to include a second seal-retaining recess (not shown, but identical to the first seal-retaining recess 260).
The first blade track segment 234 includes a first shroud wall 283, and a circumferential end 234B of the first shroud wall 283 abuts the second blade track segment 240. The circumferential end 234B is formed with a first recess 286 to define a first shoulder 288 of the first blade track segment 234. The first shroud wall 283 has a first radial outer surface 290 that faces toward the first carrier segment 232. The first radial outer surface 290 is formed on the first shoulder 288.
A fifth flange 294 of the second carrier segment 238 is formed to include a third seal-retaining recess 298 as shown in
The third seal-retaining recess 298 has a fourth height H4 (i.e., the first circumferentially-extending face 273, the second circumferentially-extending face, and the second axially-extending face 277 all have the fourth height H4). The first seal-retaining recess 260 and the third seal-retaining recess 298 are aligned with one another while the first shroud segment 226 and the second shroud segment 228 are assembled adjacent to one another as shown in
The second blade track segment 240 includes a second shroud wall 295, and a circumferential end 240B of the second shroud wall 295 abuts the first blade track segment 234. The circumferential end 240B is formed with a second recess 299 that defines a second shoulder 271 of the second blade track segment 240. The second shroud wall 295 has a second radial outer surface 269 that faces toward the second carrier segment 238. The second radial outer surface 269 is formed on the second shoulder 271.
The damping strip seal 230 includes the body segment 244, the first end portion 246, and the second end portion as shown in
The first end portion 246 is formed to include a notch 282 extending radially inwardly from a radial outer end of the forward seal member 246 as shown in
Another embodiment of a damping strip seal 330 for use with a turbine shroud assembly 320 in accordance with the present disclosure is shown in
The damping strip seal 330 includes a body segment 344, a first end portion 346, and a second end portion as shown in
The first end portion 346 of the damping strip seal 330 is formed to include a first portion 346A, a second portion 346B, and a third portion 346C as shown in
Illustratively, the third portion 346C extends into the first seal-retaining recess 260 without extending into the third seal-retaining recess 298 so that only the first carrier segment 232 is engaged by the third portion 346C. The first end portion 346 contacts the first axially-extending face 266 of the first seal-retaining recess 260 without contacting the first axially-extending face 275 of the third seal-retaining recess 298.
In other words, the body segment 344 of the damping strip seal 330 has a fifth width W5, and at least a portion of the first end portion 346 has a sixth width W6 that is less than the fifth width W5. The first end portion 346 is shaped so that it extends into each of the first seal-retaining recess 260 and the third seal-retaining recess 298, while only engaging the first seal-retaining recess 260.
Though not shown, the second end portion is configured similarly to the first end portion 346 such that the second end portion only contacts the second seal-retaining recess of the first carrier segment 232. The first end portion 346 (and the second end portion) may be any shape that allows the first end portion 346 to extend into each of the recesses 260, 298, while only engaging the first seal-retaining recess 298.
A method of assembling the turbine shroud assembly 22, 222, 322 for use with the gas turbine engine 10 is provided herein. The method includes assembling the first shroud segment 26, 226 by moving the first blade track segment 34, 234 into engagement with the first carrier segment 32, 232 and inserting the first retainer 36 through the first blade track segment 34, 234 and the first carrier segment 32, 232 to couple the first blade track segment 34, 234 to the first carrier segment 32, 232.
The method includes assembling the second shroud segment 28, 228 by moving the second blade track segment 40, 240 into engagement with the second carrier segment 38, 238 and inserting the second retainer 42 through the second blade track segment 40, 240 and the second carrier segment 38, 238 to couple the second blade track segment 40, 240 to the second carrier segment 38, 238. The method includes providing the damping strip seal 30, 230, 330 that includes the body segment 44, 244, 344, a first end portion 46, 246, 346 extending radially outward from a first end 44A of the body segment 44, 244, 344, and a second end portion 48 extending radially outward from a second end 44B of the body segment 44, 244, 344.
The method includes sliding the body segment 44, 244, 344 of the damping strip seal 30, 230, 330 onto the first radial outer surface 90, 290 of the first blade track segment 34, 234 so that the first end portion 46, 246, 346 of the damping strip seal 30, 230, 330 engages the first flange 52, 252 of the first carrier segment 32, 232 and the second end portion 48 of the damping strip seal 30, 230, 330 engages the second flange 54 of the first carrier segment 32, 232.
The method includes moving the second shroud segment 28, 228 toward the first shroud segment 26, 226 so that the second shroud segment 28, 228 is arranged circumferentially adjacent the first shroud segment 26, 226 and the body segment 44, 244, 344 of the damping strip seal 30, 230, 330 extends circumferentially between and axially along the first blade track segment 34, 234 and the second blade track segment 40, 240. The method includes locating the first end portion 46, 246, 346 of the damping strip seal 30, 230, 330 in the first seal-retaining recess 60, 260 formed in the first flange 52 and the third seal-retaining recess 98, 298 formed in the third flange 94, 294 of the second carrier segment 38, 238 and locating the second end portion 48 of the damping strip seal 30, 230, 330 in the second seal-retaining recess 76 formed in the second flange 54 and the fourth seal-retaining recess 89 formed in the fourth flange 96 of the second carrier segment 38, 238.
The method includes urging the body segment 44, 244, 344 of the damping strip seal 30, 230, 330 radially inward against the first blade track segment 34, 234 and the second blade track segment 40, 240 through engagement of the first end portion 46, 246, 346 of the damping strip seal 30, 230, 330 with the first seal-retaining recess 60, 260 and the second end portion 48 of the damping strip seal 30, 230, 330 with the second seal-retaining recess 76.
While the disclosure has been illustrated and described in detail in the foregoing drawings and description, the same is to be considered as exemplary and not restrictive in character, it being understood that only illustrative embodiments thereof have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected.
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