WO2020068114A1 - Ring seal formed by ceramic-based rhomboid body for a gas turbine engine - Google Patents

Ring seal formed by ceramic-based rhomboid body for a gas turbine engine Download PDF

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Publication number
WO2020068114A1
WO2020068114A1 PCT/US2018/053429 US2018053429W WO2020068114A1 WO 2020068114 A1 WO2020068114 A1 WO 2020068114A1 US 2018053429 W US2018053429 W US 2018053429W WO 2020068114 A1 WO2020068114 A1 WO 2020068114A1
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WO
WIPO (PCT)
Prior art keywords
ring seal
ceramic
assembly
gas turbine
turbine engine
Prior art date
Application number
PCT/US2018/053429
Other languages
French (fr)
Inventor
Zachary D. Dyer
Christian Xavier Campbell
David J. Mitchell
David Gamblin
Original Assignee
Siemens Aktiengesellschaft
Siemens Energy, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft, Siemens Energy, Inc. filed Critical Siemens Aktiengesellschaft
Priority to PCT/US2018/053429 priority Critical patent/WO2020068114A1/en
Publication of WO2020068114A1 publication Critical patent/WO2020068114A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/003Preventing or minimising internal leakage of working-fluid, e.g. between stages by packing rings; Mechanical seals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/005Sealing means between non relatively rotating elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/005Selecting particular materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/24Casings; Casing parts, e.g. diaphragms, casing fastenings
    • F01D25/246Fastening of diaphragms or stator-rings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12Blades
    • F01D5/28Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12Blades
    • F01D5/28Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/284Selection of ceramic materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00Stators
    • F01D9/02Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/042Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00Components
    • F05D2240/55Seals

Definitions

  • the present invention relates generally to the field of turbomachinery, and, more particularly, to ring seals as may be used in a turbine section of a turbomachine, such as a gas turbine engine, and, even more particularly, to ring seals such as may be formed by a ceramic-based rhomboid body.
  • a gas turbine engine typically has a compressor section, a combustion section having a num ber of combustors, and a turbine section. Ambient air is compressed in the compressor section and conveyed to the combustors in the combustion section.
  • the combustors combine the compressed air with a fuel and ignite the mixture creating combustion products.
  • the combustion products flow in a turbulent manner and at a high velocity.
  • the combustion products are routed to the turbine section via transition ducts.
  • Within the turbine section are rows of vane assemblies. Rotating blade assemblies are coupled to a turbine rotor. As the combustion product expands through the turbine section, the combustion product causes the blade assemblies and turbine rotor to rotate.
  • the turbine rotor may be linked to an electric generator and used to generate electricity.
  • ring seals such as may be made up of a plurality of ring seal segments. These ring seal segments are exposed to severe pressure boundaries and extreme temperatures. The severe pressure boundaries may create relatively large loads that the ring seals mus handle. Therefore, ring seals used in gas turbine engines should be designed to handle these environmental conditions. For one example of ring seals used in a gas turbine engine, see International Patent Application number: PCT/US2018/033594.
  • FIG. 1 is a fragmentary cross-sectional view of a gas turbine engine.
  • FIG. 2 is an isometric view of a disclosed ring seal segment, such as may be formed with a ceramic-based rhomboid body, as may be supported by an interfit structure defined by a casing of the gas turbine engine.
  • FIG 3 is an axial section view of the disclosed ring seal segment.
  • FIG. 4 is a circumferential view of adjoining ring seal segments forming a ship lap joint in the circumferential direction.
  • FIG. 5 is an isometric view i llustrating certain non-limiting structural details of the disclosed ring seal segment.
  • Disclosed embodiments are directed to ring seals, such as may be formed by a closed ceramic-based rhomboid body, and may be used in a combustion turbine engine (e.g., a gas turbine engine).
  • a combustion turbine engine e.g., a gas turbine engine
  • disclosed embodiments are effective to reliably and cost-effectively make use of CMC and other high-temperature materials, such as MAX phase materials, in the high pressure, high environment of the gas turbine engine.
  • Disclosed embodiments are designed to accommodate thermal growl h differences that may develop between the body of the ring seal and a metal casing on which the ring seal is disposed, as well as take advantage of the stiffness gain of the enclosed shape, and finally the redundant isolation of various regions of the assembly in terms of temperature exposure.
  • FIG. 1 show's a gas turbine engine 10 including a compressor section 12, a combustor section 14 and a turbine section 16.
  • Working gases flow ' from combustor section 14 toward turbine section 16 where there are alternating rows of stationary' vanes 18 and rotating blades 20.
  • Each row' of rotating blades 20 is formed by a plurality of rotating blades 20 attached to a disc 22 secured on a rotor 24.
  • the illustrated rotating blades 20 extend radially outward from the discs 22 and terminate in a region known as a blade tip 26.
  • Each row of stationary vanes 18 is formed by attaching a plurality of stationary vanes 18 to a vane carrier 28.
  • the illustrated stationary vanes 18 extend radially inward from the inner peripheral surface 30 of the vane carrier 28
  • the vane carrier 28 is attached to an outer casing 32, w ' hich encloses the turbine section 16 of the engine 10. [0016] Between the rows of stationary vanes 18, a disclosed ring seal assembly
  • Ring seal assembly 34 may be disposed. As will be appreciated by those skilled in the an, ring seal assembly 34 is a stationary component that functions as a hot gas path guide between the rows of vanes 18 at the locations of the rotating blades 20. Ring seal assembly 84 may be formed by a plurality of ring segments 50 described in greater detail below. Each ring segment 50 extends over a respective are segment and the plurality of ring segments is circumferentially interconnected to form ring seal assembly 34 During engine operation, high temperature, high velocity gases flow through the rows of vanes 18 and blades 20 in the turbine section 16. Ring seal assembly 34 is exposed to this flow of high temperature gases as well.
  • CMC ceramic matrix composite
  • CMC material components may have an allowable stress, which may be
  • CMC material components may have a relatively high degree of stiffness, and a substantially lower thermal expansion rate than metallic components, which, for example, can lead to suboptima! load distribution at transfer points.
  • CMC material components cannot merely be substituted for equivalent metal alloy components of identical geometric structures and be subjected to the same pressure loading without potentially exceeding the allowable stresses of the CMC material.
  • Disclosed embodiments of a ring seal involve structures and mounting techniques, which allow for cost-effective and reliable use of CMC and other high-temperature materials, such as MAX phase materials, in the high pressure, high temperature environment encountered by ring seals in gas turbine applications.
  • FIG. 2 is an isometric view of a disclosed ring seal segment 50 as may be
  • ring seal segment 50 may comprise a ceramic-based rhomboid body 54 (e.g., forming a dosed body along its cross-section) defining a cavity 56 withi ceramic-based rhomboid bodv 54.
  • a metal compression plate 58 may be disposed in cavity 56 against an inward surface 59 of a side 64 of ceramic-based rhomboid body 54 radially spaced apart and opposite to a hot side 66 of the ring seal assembly. That is, subject to a higher temperature than side 64 of ceramic-based rhomboid body 54.
  • Metal compression plate 58 may be arranged to apply radially-outward compression against inward surface 59 of side 64 of ceramic- based rhomboid body 54 opposite to hot side 66 of the ring seal assembly.
  • Cerarnie-based rhomboid body 54 of disclosed ring seal segment 50 may comprise a CMC material.
  • ceramic-based rhomboid body 54 may comprise a ternary ceramic, referred to in the art as a MAX phase.
  • a biasing assembly 70 (FIG. 3), such comprising one or more leaf springs, may be disposed outside cavity 56 against an outward surface 72 of the side 64 of the rhomboid body opposite to the hot side 66 of the ring seal assembly. Biasing assembly 70 may be arranged to apply a pre-load biasing force to metal compression plate 58.
  • FIG. 3 illustrates a bolt 74 having opposite ends that may connected to a radial!y-outer nut 76i supported on casing 32 and a ra ially-inner nut 76 ? supported against compression plate 58.
  • radial I y-outer nut 76i may be appropriately torqued to compress biasing assembly 70 and apply a desired pre-load biasing force to metal compression plate 58, which in turn would apply a desired radially-outward compression against inward surface 59 of side 64 of ceramic-based rhomboid body 54 opposite to hot side 66 of the ring seal assembly.
  • FIG. 4 is a circumferential view of adjoining ring seal segments 501, 50 ?. forming a ship lap joint 80, which, depending on the needs of a given application, may be arranged to improve sealing performance between circumferentially adjacent pairs of arcuate ring seal segments.
  • FIG. 5 is an isometric view illustrating certain non-limiting structural details of the disclosed ring seal segment.
  • ceramic- based rhomboid body 54 may comprise a fiber alignment extending along the periphery of the rhomboid body, as may be appreciated in the fragmentary cutaway portion shown in the figure. That is, the reinforcement fibers may extend transverse to the arc segment spanned by the ceramic-based rhomboid body. It will be appreciated that the fiber alignment in alternative
  • embodiments may comprise two-dimensional or three-dimensional woven and/or unwoven layers of reinforcing fibers, (or combinations of such arrangements of reinforcing fibers) to provide a desired performance in a given application.
  • embodiments provided ring seals, such as may be formed by a ceramic-based rhomboid body.
  • disclosed embodiments are effective to reliably and cost-effectively make use of CMC and other high-temperature materials, such as MAX phase materials, in the high pressure, high
  • Disclosed embodiments are designed to accommodate thermal growth differences that may develop between the body of the ring seal and a metal casing on which the body of the ring seal is disposed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Gasket Seals (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

A ring assembly in a gas turbine engine is provided. The ring seal assembly includes ring seal segments (50) supported by an interfit structure (52). Each ring seal segment is formed by a ceramic-based rhomboid body (54). A metal compression plate (58) is disposed against an inward surface (59) of a side (64) of the ceramic-based body spaced apart and opposite to a hot side (66) of the ring seal assembly. The metal compression plate is arranged to apply radially outward compression against the inward surface of the side (64) of the ceramic-based body. Disclosed embodiments are effective to reliably and cost-effectively make use of CMC and other high-temperature materials, such as MAX phase materials, in the environment of the gas turbine engine while accommodating thermal growth differences that may develop between the body of the ring seal and a metal casing on which the ring seal is disposed.

Description

RING SEAL FORMED BY CERAMIC-BASED
RHOMBOID BODY FOR A GAS TURBINE ENGINE
BACKGROUND
Figure imgf000003_0001
[0003] The present invention relates generally to the field of turbomachinery, and, more particularly, to ring seals as may be used in a turbine section of a turbomachine, such as a gas turbine engine, and, even more particularly, to ring seals such as may be formed by a ceramic-based rhomboid body.
[0004] 2 Description of the Related Art
[0005] A gas turbine engine typically has a compressor section, a combustion section having a num ber of combustors, and a turbine section. Ambient air is compressed in the compressor section and conveyed to the combustors in the combustion section. The combustors combine the compressed air with a fuel and ignite the mixture creating combustion products. The combustion products flow in a turbulent manner and at a high velocity. The combustion products are routed to the turbine section via transition ducts. Within the turbine section are rows of vane assemblies. Rotating blade assemblies are coupled to a turbine rotor. As the combustion product expands through the turbine section, the combustion product causes the blade assemblies and turbine rotor to rotate. The turbine rotor may be linked to an electric generator and used to generate electricity.
[0005] Within the gas turbine engine located between the rows of vanes there
generally are ring seals, such as may be made up of a plurality of ring seal segments. These ring seal segments are exposed to severe pressure boundaries and extreme temperatures. The severe pressure boundaries may create relatively large loads that the ring seals mus handle. Therefore, ring seals used in gas turbine engines should be designed to handle these environmental conditions. For one example of ring seals used in a gas turbine engine, see International Patent Application number: PCT/US2018/033594.
1000 1 BRIEF DESCRIPTION OF THE DRAWINGS
[0007] FIG. 1 is a fragmentary cross-sectional view of a gas turbine engine.
[0008] FIG. 2 is an isometric view of a disclosed ring seal segment, such as may be formed with a ceramic-based rhomboid body, as may be supported by an interfit structure defined by a casing of the gas turbine engine.
[0009] FIG 3 is an axial section view of the disclosed ring seal segment.
[0010] FIG. 4 is a circumferential view of adjoining ring seal segments forming a ship lap joint in the circumferential direction.
[0011] FIG. 5 is an isometric view i llustrating certain non-limiting structural details of the disclosed ring seal segment.
DETAILED DESCRIPTION
[0012] Disclosed embodiments are directed to ring seals, such as may be formed by a closed ceramic-based rhomboid body, and may be used in a combustion turbine engine (e.g., a gas turbine engine). Without limitation, disclosed embodiments are effective to reliably and cost-effectively make use of CMC and other high-temperature materials, such as MAX phase materials, in the high pressure, high environment of the gas turbine engine. Disclosed embodiments are designed to accommodate thermal growl h differences that may develop between the body of the ring seal and a metal casing on which the ring seal is disposed, as well as take advantage of the stiffness gain of the enclosed shape, and finally the redundant isolation of various regions of the assembly in terms of temperature exposure. 3] In the following detailed description, various specific details are set forth in order to provide a thorough understanding of such embodiments. Ho wever, those skilled in the art will understand that disclosed embodiments may be practiced without these specific details that the aspects of the present invention are not limited to the disclosed embodiments, and that aspects of the present invention may be practiced in a variety of alternative embodiments. In other instances, methods, procedures, and components, which would he well- understood by one skilled in the art have not been described in detail to avoid unnecessary and burdensome explanation.
[0014] Furthermore, various operations may be described as multiple discrete steps performed in a manner that is helpful for understanding embodiments of the present invention. However, the order of description should not be construed as to imply that these operations need be performed in the order they are presented, nor that they are even order dependent, unless otherwise indicated. Moreover, repeated usage of the phrase“in one embodiment/’ does not necessarily refer to the same embodiment, although it may. It is noted that disclosed embodiments need not be construed as mutually exclusive embodiments, since aspects of such disclosed embodiments may be appropriately combined by one skilled in the art. depending on the needs of a given application.
100151 FIG. 1 show's a gas turbine engine 10 including a compressor section 12, a combustor section 14 and a turbine section 16. Working gases flow' from combustor section 14 toward turbine section 16 where there are alternating rows of stationary' vanes 18 and rotating blades 20. Each row' of rotating blades 20 is formed by a plurality of rotating blades 20 attached to a disc 22 secured on a rotor 24. The illustrated rotating blades 20 extend radially outward from the discs 22 and terminate in a region known as a blade tip 26. Each row of stationary vanes 18 is formed by attaching a plurality of stationary vanes 18 to a vane carrier 28. The illustrated stationary vanes 18 extend radially inward from the inner peripheral surface 30 of the vane carrier 28 The vane carrier 28 is attached to an outer casing 32, w'hich encloses the turbine section 16 of the engine 10. [0016] Between the rows of stationary vanes 18, a disclosed ring seal assembly
34 may be disposed. As will be appreciated by those skilled in the an, ring seal assembly 34 is a stationary component that functions as a hot gas path guide between the rows of vanes 18 at the locations of the rotating blades 20. Ring seal assembly 84 may be formed by a plurality of ring segments 50 described in greater detail below. Each ring segment 50 extends over a respective are segment and the plurality of ring segments is circumferentially interconnected to form ring seal assembly 34 During engine operation, high temperature, high velocity gases flow through the rows of vanes 18 and blades 20 in the turbine section 16. Ring seal assembly 34 is exposed to this flow of high temperature gases as well.
[0017 Certain prior art ring seal assemblies have been made from metallic
superalloys that often involve active cooling systems and thermal barrier coatings so that the ring seal assembly can withstand the extreme temperatures to which it is exposed. As an alternative, some prior an ring seal assemblies may involve ceramic matrix composite (CMC) materials, which have higher temperature capabilities than metal alloys. By utilizing such CMC materials, cooling air can be reduced, which has a positive impact on engine
performance, emissions control and operating economics.
[0018] However, despite favorable thermal properties of CMC material components, the CMC material components present certain challenges. For example, CMC material components may have an allowable stress, which may be
approximately an order of magnitude lower than when the component is formed from a metal alloy. Additionally, the CMC material components may have a relatively high degree of stiffness, and a substantially lower thermal expansion rate than metallic components, which, for example, can lead to suboptima! load distribution at transfer points. [0019] In view of the foregoing challenges, CMC material components cannot merely be substituted for equivalent metal alloy components of identical geometric structures and be subjected to the same pressure loading without potentially exceeding the allowable stresses of the CMC material. Disclosed embodiments of a ring seal involve structures and mounting techniques, which allow for cost-effective and reliable use of CMC and other high-temperature materials, such as MAX phase materials, in the high pressure, high temperature environment encountered by ring seals in gas turbine applications.
[0020] FIG. 2 is an isometric view of a disclosed ring seal segment 50 as may be
supported by an interfit structure 52, such as a groove-and-tongue interfit structure, defined by easing 32 of gas turbine engine 10. In one non-limiting embodiment, ring seal segment 50 may comprise a ceramic-based rhomboid body 54 (e.g., forming a dosed body along its cross-section) defining a cavity 56 withi ceramic-based rhomboid bodv 54.
[0021] In this embodiment, a metal compression plate 58 may be disposed in cavity 56 against an inward surface 59 of a side 64 of ceramic-based rhomboid body 54 radially spaced apart and opposite to a hot side 66 of the ring seal assembly. That is, subject to a higher temperature than side 64 of ceramic-based rhomboid body 54. Metal compression plate 58 may be arranged to apply radially-outward compression against inward surface 59 of side 64 of ceramic- based rhomboid body 54 opposite to hot side 66 of the ring seal assembly.
This structural arrangement avoids the possibility of structural buckling of ceramic-based rhomboid body 54 in the presence of a high-pressure load. Also the location of metal compression plate 58 away from hot side 66 of the ring seal assembly is desirable for improving thermo-mechanical performance of the ring assembly. For example, if metal compression plate 58 was located at the hot side 66 of the ring seal assembly, this would likely involve a higher consumption of cooling air. [0022] Cerarnie-based rhomboid body 54 of disclosed ring seal segment 50, without limitation, may comprise a CMC material. In certain alternative non-limiting embodiments, ceramic-based rhomboid body 54 may comprise a ternary ceramic, referred to in the art as a MAX phase. For readers desirous of background information in connection with the foregoing ternary ceramic, reference is made to article authored by M. Radovic and M. W. Barsoum, titled‘"MAX phases: Bridging the gap between metals and ceramics”, American Ceramic Society Bulletin, Vol. 92, Nr. 3, p. 20-27 (April 2013), which is incorporated herein by reference.
[0023] A biasing assembly 70 (FIG. 3), such comprising one or more leaf springs, may be disposed outside cavity 56 against an outward surface 72 of the side 64 of the rhomboid body opposite to the hot side 66 of the ring seal assembly. Biasing assembly 70 may be arranged to apply a pre-load biasing force to metal compression plate 58. FIG. 3 illustrates a bolt 74 having opposite ends that may connected to a radial!y-outer nut 76i supported on casing 32 and a ra ially-inner nut 76? supported against compression plate 58. By way of example, radial I y-outer nut 76i may be appropriately torqued to compress biasing assembly 70 and apply a desired pre-load biasing force to metal compression plate 58, which in turn would apply a desired radially-outward compression against inward surface 59 of side 64 of ceramic-based rhomboid body 54 opposite to hot side 66 of the ring seal assembly.
[0024] FIG. 4 is a circumferential view of adjoining ring seal segments 501, 50?. forming a ship lap joint 80, which, depending on the needs of a given application, may be arranged to improve sealing performance between circumferentially adjacent pairs of arcuate ring seal segments. FIG. 5 is an isometric view illustrating certain non-limiting structural details of the disclosed ring seal segment. In one non-limiting embodiment, ceramic- based rhomboid body 54 may comprise a fiber alignment extending along the periphery of the rhomboid body, as may be appreciated in the fragmentary cutaway portion shown in the figure. That is, the reinforcement fibers may extend transverse to the arc segment spanned by the ceramic-based rhomboid body. It will be appreciated that the fiber alignment in alternative
embodiments, depending on the needs of a given application, may comprise two-dimensional or three-dimensional woven and/or unwoven layers of reinforcing fibers, (or combinations of such arrangements of reinforcing fibers) to provide a desired performance in a given application.
[0026] From the foregoing disclosure, it should be appreciated that disclosed
embodiments provided ring seals, such as may be formed by a ceramic-based rhomboid body. Without limitation, disclosed embodiments are effective to reliably and cost-effectively make use of CMC and other high-temperature materials, such as MAX phase materials, in the high pressure, high
environment of the gas turbine engine. Disclosed embodiments are designed to accommodate thermal growth differences that may develop between the body of the ring seal and a metal casing on which the body of the ring seal is disposed.
[0027] While embodiments of the present disclosure have been disclosed in
exemplary forms, it will be apparent to those skilled in the art that many modifications, additions, and deletions can be made therein without departing from the scope of the invention and its equivalents, as set forth in the following claims.

Claims

What is claimed is:
1. A gas turbine engine comprising:
a casing (32) defining an interfit structure (52); and
a ring seal assembly (34) comprising a plurality of arcuate ring seal segments (50) supported by the interfit structure (52), wherein each ring seal segment (50) comprises:
a ceramic-based rhomboid body (54) a defining a cavity (56) within the ceramic-based rhomboid body; and
a metal compression plate (58) disposed in the cavity against an inward surface (59) of a side (64) of the ceramic-based rhomboid body radially spaced apart and opposite to a hot side (66) of the ring seal assembly, the metal compression plate arranged to apply radially-outward compression against the inward surface of the side of the ceramic-based rhomboid body opposite to the hot side of the ring seal assembly.
2. The gas turbine engine of claim 1, wherein the ceramic-based rhomboid body comprises a ceramic matrix composite (CMC).
3. The gas turbine engine of claim 1, wherein the ceramic-based rhomboid body comprises a MAX phase ternary ceramic.
4. The gas turbine engine of claim 1, wherein the interfit structure (52) comprises a groove-and-tongue interfit structure.
5. The gas turbine engine of claim 1, further comprising a biasing assembly (70) disposed outside the cavity against an outward surface 72 of the side (64) of the rhomboid body (54) opposite to the hot side (66) of the ring seal assembly, the biasing assembly arranged to apply a pre-load biasing force to the metal compression plate.
6. The gas turbine engine of claim 5, wherein the biasing assembly comprises at least one leaf spring.
7. The gas turbine engine of claim 1, wherein a circumferentially adjacent pair of arcuate ring seal segments (501, 502) of the plurality of arcuate ring seal segments is configured to form a shiplap interface joint (80).
8. A ring assembly in a gas turbine engine, the ring seal assembly comprising:
a plurality of arcuate ring seal segments (50) supported by an interfit structure (52) defined by a casing (32) of the gas turbine engine, wherein each ring seal segment comprises:
a ceramic-based rhomboid body (54) a defining a cavity (56) within the ceramic-based rhomboid body; and
a metal compression plate (58) disposed in the cavity against an inward surface (59) of a side (64) of the ceramic-based rhomboid body radially spaced apart and opposite to a hot side (66) of the ring seal assembly, the metal compression plate arranged to apply radially outward compression against the inward surface of the side of the ceramic-based rhomboid body opposite to the hot side of the ring seal assembly.
9. The ring assembly of claim 8, wherein the ceramic-based rhomboid body comprises a ceramic matrix composite (CMC).
10. The ring assembly of claim 8, wherein the ceramic-based rhomboid body comprises a MAX phase ternary ceramic.
11. The ring assembly of claim 8, wherein the interfit structure comprises a groove-and-tongue interfit structure.
12. The ring assembly of claim Bl, further comprising a biasing assembly (70) disposed outside the cavity against an outward surface (72) of the side (64) of the rhomboid body opposite to the hot side (66) of the ring seal assembly, the biasing assembly arranged to apply a pre-load biasing force to the metal compression plate.
13. The ring assembly of claim 12, wherein the biasing assembly comprises at least one leaf spring.
14. The ring assembly of claim 8, wherein a circumferentially adjacent pair of arcuate ring seal segments (501, 502) of the plurality of arcuate ring seal segments is configured to form a shiplap interface joint (80).
PCT/US2018/053429 2018-09-28 2018-09-28 Ring seal formed by ceramic-based rhomboid body for a gas turbine engine WO2020068114A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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