EP4553275A1 - Turbomachine avec un ensemble d'aubes ayant un plénum de plate-forme - Google Patents

Turbomachine avec un ensemble d'aubes ayant un plénum de plate-forme Download PDF

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Publication number
EP4553275A1
EP4553275A1 EP24211834.7A EP24211834A EP4553275A1 EP 4553275 A1 EP4553275 A1 EP 4553275A1 EP 24211834 A EP24211834 A EP 24211834A EP 4553275 A1 EP4553275 A1 EP 4553275A1
Authority
EP
European Patent Office
Prior art keywords
feed
blade assembly
edge
shank
platform
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP24211834.7A
Other languages
German (de)
English (en)
Inventor
Zachary NOETH
Thomas WARBURG
Kelli Marie Fishback
Kurt Thomas Whittington
James DEINES
Marie MYERS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of EP4553275A1 publication Critical patent/EP4553275A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
    • F01D5/187—Convection cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/80—Platforms for stationary or moving blades
    • F05D2240/81—Cooled platforms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles

Definitions

  • the present subject matter relates generally to a blade assembly for a turbine engine, and more specifically to a blade assembly with a platform plenum.
  • a gas turbine engine typically includes a turbomachine, with a fan in some implementations.
  • the turbomachine generally includes a compressor, combustor, and turbine in serial flow arrangement.
  • the compressor compresses air which is channeled to the combustor where it is mixed with fuel.
  • the mixture is then ignited to generate hot combustion gases.
  • the combustion gases are channeled to the turbine, which extracts energy from the combustion gases for powering the compressor and fan, if used, as well as for producing useful work to propel an aircraft in flight or to power a load, such as an electrical generator.
  • various systems During operation of the gas turbine engine, various systems generate a relatively large amount of heat and stress. For example, a substantial amount of heat or stress can be generated during operation of the thrust generating systems, lubrication systems, electric motors and/or generators, hydraulic systems or other systems.
  • a design that mitigates heat loads and/or stresses on an engine component is advantageous.
  • aspects of the disclosure generally relate to a blade assembly having conduits located within the blade assembly.
  • the blade assembly includes an airfoil with a plurality of cooling conduits.
  • the airfoil also includes cooling holes fluidly coupled to the plurality of cooling conduits within the airfoil.
  • the blade assembly may be a blade assembly in a turbine section of a gas turbine engine.
  • the blade assembly may be a stage one blade assembly of a high pressure turbine, which typically experiences the highest thermal and mechanical stresses.
  • the blade assembly includes a shank and a platform.
  • the shank is used to attach the blade assembly to a turbine disk.
  • the shank is formed as a dovetail received in the turbine disk.
  • the platform of the blade assembly together with other circumferentially arranged platforms of other blade assemblies, defines a continuous annular ring that prevents hot gas leakage into the turbine disk cavity and/or a stator ring of the gas turbine engine.
  • the airfoil extends radially from the platform, away from the turbine disk, while the shank extends radially from the platform, toward the turbine disk.
  • cooling conduits in the blade assembly create stress concentrations.
  • the size of the cooling conduits affects the thickness of the airfoil wall, which affects stress concentrations in the airfoil. Relatively large stresses can contribute to an unexpected or premature part replacement. Therefore, there is a need for a blade assembly with greater durability to increase time on wing.
  • aspects of the disclosure generally relate to a blade assembly having a platform plenum within.
  • the blade assembly includes a platform with the platform plenum formed between an airfoil and a shank of the blade assembly.
  • the airfoil also includes cooling holes fluidly coupled to the set of cooling conduits within.
  • particulate matter can accumulate in the platform plenum and other portions of the blade assembly. Such accumulation can reduce the flow of fluid through the cooling conduits of a blade assembly and increase the thermal stress on the blade assembly.
  • connection references e.g., attached, coupled, connected, and joined are to be construed broadly and can include intermediate structural elements between a collection of elements and relative movement between elements unless otherwise indicated. As such, connection references do not necessarily infer those two elements are directly connected and in fixed relation to one another.
  • the exemplary drawings are for purposes of illustration only and the dimensions, positions, order and relative sizes reflected in the drawings attached hereto can vary.
  • a "stage" of either a compressor or a turbine of a gas turbine engine is a set of blade assemblies and an adjacent set of vane assemblies, with both sets of the blade assemblies and the vane assemblies circumferentially arranged about an engine centerline.
  • a pair of circumferentially-adjacent vanes in the set of vane assemblies are referred to as a nozzle.
  • the blade assemblies rotate relative to the engine centerline and, in one example, are mounted to a rotating structure, such as a disk, to affect the rotation.
  • exemplary means “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other implementations. Additionally, unless specifically identified otherwise, all embodiments described herein should be considered exemplary.
  • first, second, third, and fourth can be used interchangeably to distinguish one component from another and are not intended to signify location or importance of the individual components.
  • a "set" or a set of elements can include any number of said elements, including one.
  • forward and aft refer to relative positions within a gas turbine engine and refer to the normal operational attitude or direction of travel of the gas turbine engine.
  • forward refers to a position relatively closer to the nose of an aircraft and aft refers to a position relatively closer to a tail of the aircraft.
  • upstream and downstream refer to a direction with respect to a direction of fluid flow along a flowpath.
  • fluid refers to a gas or a liquid and "fluidly coupled” means a fluid can flow between the coupled regions.
  • a radial direction is a direction that is perpendicular to a base plane on a shank of a blade assembly.
  • an axial direction is a direction that is perpendicular to a shank leading-edge plane on the shank of the blade assembly.
  • a tangential direction is a direction that is perpendicular to the radial direction and the axial direction.
  • a stator rotor seal radius (denoted SRSR ) is a radius of curvature of an upper edge of a stator rotor seal on a blade assembly.
  • cooling conduit refers to a flow path that conveys a cooling fluid that is formed in a blade assembly.
  • outlet passage refers to a cooling conduit formed in a shank of the blade assembly.
  • platform plenum refers to a cavity radially inward of an upper surface of a platform for distribution of a cooling fluid throughout a blade assembly.
  • feed conduit refers to a cooling conduit extending between an inlet passage and a platform plenum.
  • a feed inlet refers to the end of the feed conduit at the inlet passage and "a feed outlet” refers to the end of the feed conduit at the platform plenum.
  • a feed centerline refers to a line extending through a geometric center of a feed inlet and a feed outlet of the feed conduit.
  • a minimum feed cross-sectional area (denoted FA ) is the smallest cross-sectional area of a feed conduit taken in a plane perpendicular to a feed centerline of the feed conduit.
  • a feed angle (denoted ⁇ ) is an angle measured from a plane parallel to a base of a shank of a blade assembly and a feed centerline (FCL) of a feed conduit of the blade assembly.
  • FIG. 1 is a schematic view of a gas turbine engine 10.
  • the gas turbine engine 10 can be used on an aircraft.
  • the gas turbine engine 10 includes an engine core extending along an engine centerline 20 and including, at least, a compressor section 12, a combustor 14, and a turbine section 16 in serial flow arrangement.
  • the gas turbine engine 10 includes a fan (not shown) that is driven by the engine core to produce thrust and provide air to the compressor section 12.
  • the gas turbine engine 10 includes a drive shaft 18 that rotationally couples the fan, compressor section 12, and turbine section 16, such that rotation of one affects the rotation of the others, and defines a rotational axis along the engine centerline 20 of the gas turbine engine 10.
  • the compressor section 12 includes a low-pressure (LP) compressor 22 and a high-pressure (HP) compressor 24 serially fluidly coupled to one another.
  • the turbine section 16 includes an HP turbine 26 and a LP turbine 28 serially fluidly coupled to one another.
  • the drive shaft 18 operatively couples the LP compressor 22, the HP compressor 24, the HP turbine 26 and the LP turbine 28 to one another.
  • the drive shaft 18 includes an LP drive shaft (not illustrated) and an HP drive shaft (not illustrated), where the LP drive shaft couples the LP compressor 22 to the LP turbine 28, and the HP drive shaft couples the HP compressor 24 to the HP turbine 26.
  • the compressor section 12 includes a plurality of axially spaced stages. Each stage includes a set of circumferentially-spaced rotating blade assemblies and a set of circumferentially-spaced stationary vane assemblies.
  • the compressor blade assemblies for a stage of the compressor section 12 are mounted to a disk, which is mounted to the drive shaft 18. Each set of blade assemblies for a given stage can have its own disk.
  • the vane assemblies of the compressor section 12 are mounted to a casing which extends circumferentially about the gas turbine engine 10. In a counter-rotating turbine engine, the vane assemblies are mounted to a drum, which is similar to the casing, except the drum rotates in a direction opposite the blade assemblies, whereas the casing is stationary. It will be appreciated that the representation of the compressor section 12 is merely schematic. The number of stages can vary.
  • the turbine section 16 includes a plurality of axially spaced stages, with each stage having a set of circumferentially-spaced, rotating blade assemblies and a set of circumferentially-spaced, stationary vane assemblies.
  • the turbine blade assemblies for a stage of the turbine section 16 are mounted to a disk which is mounted to the drive shaft 18.
  • Each set of blade assemblies for a given stage can have its own disk.
  • the vane assemblies of the turbine section are mounted to the casing in a circumferential manner.
  • the vane assemblies can be mounted to a drum, which is similar to the casing, except the drum rotates in a direction opposite the blade assemblies, whereas the casing is stationary.
  • the number of blade assemblies, vane assemblies, and turbine stages can vary.
  • the combustor 14 is provided serially between the compressor section 12 and the turbine section 16.
  • the combustor 14 is fluidly coupled to at least a portion of the compressor section 12 and the turbine section 16 such that the combustor 14 at least partially fluidly couples the compressor section 12 to the turbine section 16.
  • the combustor 14 is fluidly coupled to the HP compressor 24 at an upstream end of the combustor 14 and to the HP turbine 26 at a downstream end of the combustor 14.
  • ambient or atmospheric air is drawn into the compressor section 12 via the fan, upstream of the compressor section 12, where the air is compressed defining a pressurized air.
  • the pressurized air then flows into the combustor 14 where the pressurized air is mixed with fuel and ignited, thereby generating hot combustion gases.
  • Some work is extracted from these combustion gases by the HP turbine 26, which drives the HP compressor 24.
  • the combustion gases are discharged into the LP turbine 28, which extracts additional work to drive the LP compressor 22, and the exhaust gas is ultimately discharged from the gas turbine engine 10 via an exhaust section (not illustrated) downstream of the turbine section 16.
  • the driving of the LP turbine 28 drives the LP spool to rotate the fan and the LP compressor 22.
  • the pressurized airflow and the combustion gases together define a working airflow that flows through the fan, compressor section 12, combustor 14, and turbine section 16 of the gas turbine engine 10.
  • the turbine section 16 includes sets of blade assemblies 30 circumferentially mounted to corresponding disks 32.
  • the number of individual blade assemblies of the set of blade assemblies 30 mounted to each disk 32 may vary. While shown schematically in FIG. 2 , it should be understood that the turbine section 16 can be a single stage turbine, or can include additional stages as shown.
  • Stationary vane assemblies 34 are mounted to a stator ring 36 located distally exterior of each of the disks 32.
  • a nozzle 38 is defined by the space between circumferentially-adjacent pairs of stationary vane assemblies 34.
  • the number of nozzles 38 provided on the stator ring 36 may vary.
  • a flow of hot gas or heated fluid flow exits the combustor 14 and enters the turbine section 16.
  • the heated fluid flow HF is directed through the nozzles 38 and impinges on the blade assemblies 30, which rotates the blade assemblies 30 circumferentially around the engine centerline 20 and cause rotation of the drive shaft 18.
  • FIG. 3 is a perspective view of a single blade assembly 30 ( FIG. 2 ) for the gas turbine engine 10 ( FIG. 1 ).
  • the blade assembly 30 may correspond to a stage one blade assembly of the HP turbine 26.
  • the blade assembly 30 includes a shank 40, a platform 50, and an airfoil 60 on the platform 50.
  • the blade assembly 30 can be constructed as a single unitary part or component (e.g., a monolithic structure).
  • the shank 40, the platform 50, and/or the airfoil 60 can be constructed as separate parts or components that are coupled together to form the blade assembly 30.
  • the shank 40 extends between a base 42 and the platform 50.
  • the base 42 of the shank 40 is a flat surface that defines a plane, referred to herein interchangeably as the base plane or the first plane (denoted “P1").
  • a radial direction (denoted “R") of the blade assembly 30 is a direction that is perpendicular to the base plane BP.
  • the shank 40 extends between a shank leading-edge 44 and a shank trailing-edge 46.
  • the shank leading-edge 44 is a flat surface that defines a plane, referred herein as the shank leading-edge plane (denoted "SLEP").
  • An axial direction (denoted “A") of the blade assembly 30 is a direction that is perpendicular to the shank leading-edge plane SLEP.
  • a tangential direction (denoted “T”) is a direction perpendicular to both the radial direction R and the axial direction A.
  • the shank 40 is between a base 42 and the platform 50 in the radial direction.
  • the shank 40 extends between a shank leading-edge 44 and a shank trailing-edge 46 in the axial direction.
  • the shank 40 is configured to mount to the disk 32 ( FIG. 2 ) of the engine 10 in order to rotatably drive the blade assembly 30.
  • the shank 40 is a dovetail.
  • the shank 40 can have a different shape, such as a firtree or a bulb.
  • the shank 40 includes a set of inlet passages 48 for receiving a cooling fluid (denoted "CF") for cooling the blade assembly 30.
  • the set of inlet passages 48 can include 3 inlet passages (e.g., a leading-edge inlet passage, a middle inlet passage, and a trailing-edge inlet passage, etc.)
  • the airfoil 60 meets the platform 50 to define a root 61 and spans to a tip 62. Additionally, the airfoil 60 includes an outer wall 63 defining an exterior surface 59 including a pressure side 64 and a suction side 65. The airfoil 60 extends between an airfoil leading-edge 66 and an airfoil trailing-edge 67 downstream from the airfoil leading-edge 66. The airfoil leading-edge 66 and the airfoil trailing-edge 67 separate the pressure side 64 from the suction side 65.
  • a set of cooling conduits 68 is formed within the airfoil 60. Any number of cooling holes 69 can be formed in the outer wall 63 to fluidly couple the set of cooling conduits 68 within airfoil 60 of the blade assembly 30 to an exterior of the blade assembly 30.
  • the platform 50 has an upper surface 51 (e.g., a first surface, etc.) and a lower surface 52 (e.g., a second surface, etc.) and extends between a platform leading-edge 53 and a platform trailing-edge 54 in the axial direction.
  • an upper surface 51 e.g., a first surface, etc.
  • a lower surface 52 e.g., a second surface, etc.
  • the platform 50 extends between a platform leading-edge 53 and a platform trailing-edge 54, opposite the platform leading-edge 53, in the axial A direction.
  • the platform 50 further extends between a first slashface 55 and a second slashface 56, opposite the first slashface 55, in the tangential T direction.
  • consecutive blade assemblies 30 are arranged in a circumferential direction about the engine centerline 20 ( FIG. 1 ) with sequential slashfaces 55, 56 facing each other.
  • a platform plenum 70 is formed below the lower surface 52 and is fluidly coupled to the set of cooling conduits 68 and to the set of inlet passages 48 via a feed outlet 73.
  • the platform plenum 70 is sealed off during manufacturing.
  • a heated fluid flow HF such as a combustor flow
  • the airfoil leading-edge 66 is defined by a stagnation point with respect to the heated fluid flow HF.
  • the heated fluid flow HF flows generally in the axial direction, from forward to aft, while the local directionality can vary as the fluid flow HF is driven or turned within the gas turbine engine 10.
  • the cooling fluid flow CF is fed to the set of inlet passages 48 and flows into the set of cooling conduits 68 to cool the airfoil 60.
  • the cooling fluid flow CF is provided throughout the airfoil 60 and exhausted from the set of cooling conduits 68 via the cooling holes as a cooling film.
  • the platform 50 helps to radially contain the gas turbine engine 10 mainstream heated fluid flow HF acting to protect the disk 32.
  • the platform 50 acts to seal the space radially inward of the platform 50 between the flow path of the heated fluid flow HF and the disk 32.
  • the disk 32 requires significant cooling to ensure the durability of the HP turbine 26 components.
  • Materials used to form the blade assembly 30 include, but are not limited to, steel, refractory metals such as titanium, or superalloys based on nickel, cobalt, or iron, ceramic matrix composites, or combinations thereof.
  • the structures can be formed by a variety of methods, including additive manufacturing, casting, electroforming, or direct metal laser melting, in non-limiting examples.
  • FIG. 4 a front perspective view of the blade assembly 30 is illustrated.
  • a platform plenum 70 is illustrated in phantom and located within the platform 50.
  • a feed conduit 71 extends between a feed inlet 72 and the feed outlet 73.
  • the feed inlet 72 is fluidly coupled to the set of inlet passages 48.
  • the feed inlet 72 is fluidly coupled to the middle inlet passage 48m of FIG. 3 .
  • the feed inlet 72 is coupled to a different one of the set of inlet passages 48.
  • the middle inlet passage 48m is located mid-way between the shank leading-edge 44 and the shank trailing-edge 46.
  • the feed centerline FCL extends through a first geometric center 74 ( FIG. 5 ) of the feed inlet 72 and a second geometric center 75 ( FIG. 5 ) of the feed outlet 73.
  • the first plane (denoted “P1") of FIG. 3 is illustrated in FIG. 3 .
  • a second plane (denoted “P2”) is defined as the plane that is parallel to the first plane and intersects the feed centerline FCL at the first geometric center 74.
  • the second plane is perpendicular to the radial direction.
  • FIG. 5 an enlarged view of the feed conduit 71 is illustrated. It can more clearly be seen that the feed centerline FCL and the second plane P2 form the feed angle ⁇ therebetween.
  • the minimum feed cross-sectional area FA is measured at a location 76 where the cross-sectional area of the feed conduit 71 is smallest.
  • the minimum feed cross-sectional area FA is measured in the plane that is perpendicular to the feed centerline FCL.
  • the platform 50 has a stator rotor seal 57 that extends axially forward from the platform leading-edge 53.
  • the stator rotor seal 57 facilitates sealing of a forward wing buffer cavity (not shown) defined within the rotor assembly.
  • the stator rotor seal 57 has an upper surface 80, a lower surface 81 opposite the upper surface 80, and a forward surface 82 between the upper surface 80 and the lower surface 81.
  • the stator rotor seal 57 has an upper edge 83 between the upper surface 80 and the forward surface 82.
  • the upper edge 83 is curved or arc- shaped.
  • the upper edge 83 is curved between a first end point 84 at the first slashface 55 and a second end point 85 at the second slashface 56.
  • the upper edge 83 of stator rotor seal 57 has a center point 86 that forms the peak of the arc.
  • the upper edge 83 of the stator rotor seal 57 has a radius of curvature, referred to herein as a stator rotor seal radius (denoted "SRSR").
  • the center of the radius of curvature may be the engine centerline 20 ( FIG. 1 ). As shown in FIG.
  • the SRSR (i.e., the radius of curvature of the upper edge 83 of the stator rotor seal 57) can be calculated using the straight-line distance (S) between the two the end points 84, 85, and the maximum deflection (D), in the radial R direction, between the two end points 84, 85 and the center point 86 of the arc.
  • the blade assemblies 30 of the HP turbine 26 and, specifically, the stage one blade assemblies 30 are exposed to the highest temperatures in the gas turbine engine 10. These stage one blade assemblies also rotate at extremely high angular velocities. The extreme temperature environment and the high rotational speeds impart large forces on the blade assemblies 30 that can lead to creep and fatigue, especially along the suction side of the airfoil. Creep and fatigue may result in unintended engine removals for inspections and/or serving that limit engine Time on Wing (TOW). Therefore, there is a need for a blade assembly with high durability that can withstand these large centrifugal stresses and reduce (e.g., minimize) creep and fatigue.
  • TOW Time on Wing
  • some blade assemblies include cooling networks formed within various parts of the blade assembly to facilitate the flow of cooling fluid throughout the blade assembly.
  • Cooling fluid is introduced to the blade assembly via inlet passages and fed to various locations.
  • the cooling fluid can include particulates, which can accumulate within areas of the blade assembly. The accumulation of such particulates within the blade assembly can prevent the desired cooling by the flow cooling fluid and result in elevated temperatures that drive lower local part durability.
  • While changing the geometry of the cooling conduits can mitigate particulate accumulation, such changes can result in the backflow margin decreasing to inadequate levels.
  • Low backflow margins can result in the ingestion of hot combustion gas into the blade assembly, which can increase the temperature of the blade assembly and reduce part durability. Mitigation of particulate build-up without sacrificing backflow margin is necessary to increase effective cooling and prevent creep and fatigue.
  • the inventors have found solutions that decrease the feed angle ( ⁇ ) at which the cooling fluid is introduced into the platform plenum 70, which provides an indirect path for particulates to enter the platform plenum 70.
  • the feed angle ⁇ influences the particulate accumulation with the blade assembly 30, which influences the temperature of the blade assembly and the durability thereof. Greater feed angles ⁇ are associated with a more direct path for particulates to enter the platform plenum. Accordingly, lowering the feed angle ⁇ can reduce the accumulation of particles with the blade assembly 30.
  • the inventors have further found that reducing the minimum feed cross-sectional area (FA) of the feed conduit 71 reduces the amount of particulates entering the feed conduit 71. Particularly, the minimum feed cross-sectional area FA influences the particulate accumulation with the blade assembly 30, which influences the temperature of the blade assembly and the durability thereof. Lowering the minimum feed cross-sectional area FA reduces particulate flows, but can reduce the BFM.
  • the inventors determined, through developing multiple blade assembly designs, that the size of the SRSR has a significant effect on the durability of the blade assembly 30.
  • the SRSR is integral to the airfoil 60 external geometry and characterizes the component height in operation.
  • the airfoil 60 is designed for rotational operation and this SRSR relates to the loading characteristics experienced by the airfoil 60. Due to the relationship with airfoil height and rotational operation, the SRSR can be used to characterize the loading and stresses of the airfoil as the primary contributors to airfoil stress are due to rotation, flowpath, and thermal conditions. The stress experienced by the airfoil contributes to component durability.
  • the inventors determined during the course of their blade assembly design that the feed angle and the minimum feed cross-sectional area FA of the feed conduit 71 of FIG. 5 , and the SRSR of FIG. 3 and 6 .
  • Table 1 illustrates fourteen examples (denoted Ex. 1-14) of gas turbine engines with blade assemblies considered by the inventors.
  • Table 1 includes feed cross-sectional area values, feed angle values, and stator rotor seal radius values for each of the examples.
  • TABLE 1 Parameter ⁇ (Feed Angle) FA (Feed Cross-sectional Area) SRSR (Stator rotor seal radius) Parameter Units degrees (°) Square Meters (m 2 Meters (m) Ex. 1 0.01 3.50E-06 0.224 Ex. 2 78 2.00E-06 0.239 Ex.
  • the examples developed by the inventors shown in Table 1 can be characterized by an Expression (EQ) that can be used to distinguish those designs in Examples 1-10 that meet the performance (durability) requirements from those designs in Examples 11-14 that do not meet the performance requirements.
  • the Expression (EQ) can be used to identify an improved blade assembly design, better suited for a particular engine operating environment and taking into account the constraints imposed on blade assembly design with cooling holes used in such a system.
  • the benefits included herein provide for a blade assembly 30 that fits within existing engines.
  • the designs of Examples 1-10 take existing engines into consideration, permitting replacement of current blade assemblies with replacement blade assemblies (or new blade assemblies) having the parameters of the blade assembly 30 described herein.
  • Such consideration provides for replacing and improving current engine systems without requiring the creation of new engine parts capable of holding the blade assembly 30. This provides for improving current engine durability without increasing costs to prepare new engines or further adapt existing engines.
  • Table 3 illustrates minimum and maximum value ranges for the feed cross-sectional area FA, the feed angle ⁇ , and the stator rotor seal radius SRSR along with a range of values for Expression (EQ) suited for a blade assembly 30 that meets durability constraints.
  • Additional benefits associated with the blade assembly 30 with the feed conduit 71 described herein include a quick assessment of design parameters in terms of blade assembly size and cooling conduit geometry, engine operational conditions, and blade and vane assembly numbers for engine design and particular blade design. Narrowing these multiple factors to a region of possibilities saves time, money, and resources.
  • the blade assembly 30 with the feed conduit 71 described herein enables the development and production of high-performance turbine engines and blade assemblies across multiple performance metrics within a given set of constraints.
  • designs outside the innovative design space developed by the inventors attempt to increase durability by making sacrifices in terms of weight, aerodynamic performance, and efficiency.
  • the standard practice for solving the problem of improving blade assembly durability has been to utilize stronger material.
  • such materials lead to increased costs, system weight, and overall space occupied by the blade assembly.
  • the overall engine efficiency may be reduced and related components may have to be redesigned to compensate for the stronger materials. In some cases, this result of such a cost-benefit analysis is impractical or impossible. Therefore, a solution for reducing stresses located in airfoils presently used in existing engines is needed, without requiring redesign of related components or without sacrificing overall engine efficiency.
  • increasing size of the airfoil or related components, utilizing stronger material, and/or providing additional cooling features can combat centrifugal and thermal stresses.
  • increased size, stronger materials, and additional cooling features can lead to increased costs, system weight, overall space occupied by the blade assembly, and performance loss, as well as increased local stresses at the cooling conduits due to increased weight and size relating to the centrifugal forces.
  • Increased cooling features results in a relatively less amount of material utilized, which can result in an increase in local stresses at the cooling conduits. Therefore, a solution for reducing stresses at the cooling conduits is needed without otherwise increasing stresses, weight, size, or decreasing engine efficiency.
  • Example 1-10 of Tables 1 and 2 provide successful solutions without the need to increase thickness, weight, strength, or the number of cooling features.
  • the Example 1-10 of Tables 1-2 illustrate that designs having an Expression (EQ) value from 0 to 7.940 (i.e., 0.000 ⁇ EQ ⁇ 7.940), achieve increased durability without penalties to size, weight, strength, or stress through the use of additional cooling features.
  • EQ Expression
  • Example 1 includes a blade assembly for a gas turbine engine, the blade assembly comprising a platform having a first surface and a second surface, the platform having a stator rotor seal with an upper edge having a radius of curvature defined as a stator rotor seal radius (SRSR), wherein the stator rotor seal radius (SRSR) is 0.224 to 0.239 meters, an airfoil extending radially outward from the first surface, the airfoil having an outer wall defining an exterior surface, the exterior surface defining a pressure side and a suction side, the outer wall extending between a leading-edge and a trailing-edge, and also extending between a root and a tip, a shank extending radially inward from the second surface to a base, the base defining a base plane, a feed conduit comprising a passage extending from a feed inlet to a feed outlet, the feed inlet and the feed outlet defining a feed centerline therebetween, the feed inlet fluidly coupled to the set
  • Example 2 includes the blade assembly of any preceding example, wherein the set of the inlet passages includes a leading-edge inlet passage, a middle inlet passage, and a trailing-edge inlet passage.
  • Example 3 includes the blade assembly of any preceding example, wherein the feed inlet is fluidly coupled to the middle inlet passage.
  • Example 4 includes the blade assembly of any preceding example, wherein the shank includes a shank leading-edge and a shank trailing-edge, the middle inlet passage is mid-way between the shank leading-edge and the shank trailing-edge.
  • Example 5 includes the blade assembly of any preceding example, wherein the geometric center is a first geometric center and the feed centerline extends through the first geometric center and a second geometric enter of the feed outlet.
  • Example 6 includes the blade assembly of any preceding example, wherein the shank has a dovetail.
  • Example 7 includes the blade assembly of any preceding example, wherein the platform plenum is fluidly coupled to a cooling conduit of the airfoil.
  • Example 8 includes the blade assembly of any preceding example, wherein the blade assembly includes a plurality of cooling holes, the cooling holes coupling the cooling conduit and an exterior of the blade assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP24211834.7A 2023-11-10 2024-11-08 Turbomachine avec un ensemble d'aubes ayant un plénum de plate-forme Pending EP4553275A1 (fr)

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US202363597832P 2023-11-10 2023-11-10
US202463686055P 2024-08-22 2024-08-22

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EP4553275A1 true EP4553275A1 (fr) 2025-05-14

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EP24211834.7A Pending EP4553275A1 (fr) 2023-11-10 2024-11-08 Turbomachine avec un ensemble d'aubes ayant un plénum de plate-forme
EP24211811.5A Pending EP4553274A1 (fr) 2023-11-10 2024-11-08 Turbomachine avec un ensemble d'aubes ayant un plénum de plate-forme

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7131817B2 (en) * 2004-07-30 2006-11-07 General Electric Company Method and apparatus for cooling gas turbine engine rotor blades
US9810070B2 (en) * 2013-05-15 2017-11-07 General Electric Company Turbine rotor blade for a turbine section of a gas turbine
US11131213B2 (en) * 2020-01-03 2021-09-28 General Electric Company Engine component with cooling hole

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7131817B2 (en) * 2004-07-30 2006-11-07 General Electric Company Method and apparatus for cooling gas turbine engine rotor blades
US9810070B2 (en) * 2013-05-15 2017-11-07 General Electric Company Turbine rotor blade for a turbine section of a gas turbine
US11131213B2 (en) * 2020-01-03 2021-09-28 General Electric Company Engine component with cooling hole

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