US20130115060A1 - Bucket assembly for turbine system - Google Patents

Bucket assembly for turbine system Download PDF

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Publication number
US20130115060A1
US20130115060A1 US13/289,146 US201113289146A US2013115060A1 US 20130115060 A1 US20130115060 A1 US 20130115060A1 US 201113289146 A US201113289146 A US 201113289146A US 2013115060 A1 US2013115060 A1 US 2013115060A1
Authority
US
United States
Prior art keywords
cooling circuit
platform
passage
bucket assembly
face
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.)
Abandoned
Application number
US13/289,146
Other languages
English (en)
Inventor
Jalindar Appa Walunj
Mark Steven Honkomp
Sergio Daniel Marques Amaral
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
Priority to US13/289,146 priority Critical patent/US20130115060A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Amaral, Sergio Daniel Marques, HONKOMP, MARK STEVEN, WALUNJ, JALINDAR APPA
Priority to EP12191000.4A priority patent/EP2597262B1/fr
Priority to CN2012104344574A priority patent/CN103089333A/zh
Publication of US20130115060A1 publication Critical patent/US20130115060A1/en
Abandoned 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
    • F01D5/186—Film cooling
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • the subject matter disclosed herein relates generally to turbine systems, and more specifically to bucket assemblies for turbine systems.
  • Turbine systems are widely utilized in fields such as power generation.
  • a conventional gas turbine system includes a compressor, a combustor, and a turbine.
  • various components in the system are subjected to high temperature flows, which can cause the components to fail. Since higher temperature flows generally result in increased performance, efficiency, and power output of the gas turbine system, the components that are subjected to high temperature flows must be cooled to allow the gas turbine system to operate at increased temperatures.
  • a cooling medium may be routed from the compressor and provided to various components.
  • the cooling medium may be utilized to cool various compressor and turbine components.
  • Buckets are one example of a hot gas path component that must be cooled.
  • various parts of the bucket such as the airfoil, the platform, the shank, and the dovetail, are disposed in a hot gas path and exposed to relatively high temperatures, and thus require cooling.
  • Various cooling passages and cooling circuits may be defined in the various parts of the bucket, and cooling medium may be flowed through the various cooling passages and cooling circuits to cool the bucket.
  • a platform cooling circuit is provided in many know buckets.
  • a typical platform cooling circuit includes an inlet portion that extends from the platform to the shank of the bucket in a curvilinear fashion. Specifically, a curvilinear portion of the inlet portion is typically located near an exterior intersection between the platform and shank. Thus, during operation of the bucket, when the platform and shank are subjected to differing temperatures, this temperature differential may create significant bending stresses at the curvilinear portion of the inlet portion. These stresses can lead to a low thermal fatigue life, and thus require frequent repair or replacement of buckets.
  • an improved bucket assembly for a turbine system is desired in the art.
  • a bucket assembly with an improved platform cooling circuit would be advantageous.
  • a bucket assembly for a turbine system includes a main body having an exterior surface and defining a main cooling circuit, and a platform surrounding the main body and at least partially defining a platform cooling circuit.
  • the platform includes a forward portion and an aft portion each extending between a pressure side slash face and a suction side slash face and further includes a forward face, an aft face, and a top face.
  • the platform cooling circuit includes an upper surface and a lower surface.
  • the bucket assembly further includes a passage extending between and providing fluid communication between the main cooling circuit and the platform cooling circuit. An end opening of the passage is defined in the lower surface of the platform cooling circuit.
  • FIG. 1 is a schematic illustration of a gas turbine system according to one embodiment of the present disclosure
  • FIG. 2 is a perspective view of a bucket assembly according to one embodiment of the present disclosure
  • FIG. 3 is a front view illustrating the internal components of a bucket assembly according to one embodiment of the present disclosure
  • FIG. 4 is a partial perspective view illustrating the internal components of a bucket assembly according to one embodiment of the present disclosure.
  • FIG. 5 is a perspective view of a platform cooling circuit and passage according to one embodiment of the present disclosure.
  • FIG. 1 is a schematic diagram of a gas turbine system 10 .
  • the system 10 may include a compressor 12 , a combustor 14 , and a turbine 16 .
  • the compressor 12 and turbine 16 may be coupled by a shaft 18 .
  • the shaft 18 may be a single shaft or a plurality of shaft segments coupled together to form shaft 18 .
  • the turbine 16 may include a plurality of turbine stages.
  • the turbine 16 may have three stages.
  • a first stage of the turbine 16 may include a plurality of circumferentially spaced nozzles and buckets.
  • the nozzles may be disposed and fixed circumferentially about the shaft 18 .
  • the buckets may be disposed circumferentially about the shaft and coupled to the shaft 18 .
  • a second stage of the turbine 16 may include a plurality of circumferentially spaced nozzles and buckets.
  • the nozzles may be disposed and fixed circumferentially about the shaft 18 .
  • the buckets may be disposed circumferentially about the shaft 18 and coupled to the shaft 18 .
  • a third stage of the turbine 16 may include a plurality of circumferentially spaced nozzles and buckets.
  • the nozzles may be disposed and fixed circumferentially about the shaft 18 .
  • the buckets may be disposed circumferentially about the shaft 18 and coupled to the shaft 18 .
  • the various stages of the turbine 16 may be at least partially disposed in the turbine 16 in, and may at least partially define, a hot gas path (not shown). It should be understood that the turbine 16 is not limited to three stages, but rather that any number of stages are within the scope and spirit of the present disclosure.
  • the compressor 12 may include a plurality of compressor stages (not shown). Each of the compressor 12 stages may include a plurality of circumferentially spaced nozzles and buckets.
  • the bucket assembly 30 may include a main body 32 and a platform 34 .
  • the main body 32 typically includes an airfoil 36 and a shank 38 .
  • the airfoil 36 may be positioned radially outward from the shank 38 .
  • the shank 38 may include a root 40 , which may attach to a rotor wheel (not shown) in the turbine system 10 to facilitate rotation of the bucket assembly 30 .
  • the main body 32 has an exterior surface.
  • the portion of the exterior surface defining the airfoil 36 may have a generally aerodynamic contour.
  • the airfoil 32 may have an exterior surface defining a pressure side 42 and suction side 44 each extending between a leading edge 46 and a trailing edge 48 .
  • the portion of the exterior surface of the shank 38 may include a pressure side face 52 , a suction side face 54 , a leading edge face 56 , and a trailing edge face 58 .
  • the platform 34 may generally surround the main body 32 , as shown.
  • a typical platform may be positioned at an intersection or transition between the airfoil 36 and shank 38 of the main body 32 , and extend outwardly in the generally axial and tangential directions. It should be understood, however, that a platform according to the present disclosure may have any suitable position relative to the main body 32 of the bucket assembly 30 .
  • a platform 34 may include a forward portion 62 and an aft portion 64 .
  • the forward portion 62 is that portion of the platform 34 positioned proximate the leading edge 46 of the airfoil 36 and the leading edge face 56 of the shank 38
  • the aft portion 64 is that portion of the platform 34 positioned proximate the trailing edge 48 of the airfoil 36 and the trailing edge 58 of the shank 36
  • the forward portion 62 and the aft portion 64 may further define a top face 66 of the platform 34 , which may generally surround the airfoil 36 as shown.
  • a peripheral edge may surround the forward portion 62 , aft portion 64 , and top face 66 .
  • the peripheral edge may include a pressure side slash face 72 and suction side slash face 74 , which each of the forward portion 62 and the aft portion 64 may extend between.
  • the peripheral edge may further include a forward face 76 , which may define a peripheral edge of the forward portion 62 , and an aft face 78 , which may define a peripheral edge of the aft portion 64 .
  • the main body 32 may define one or more main cooling circuits therein.
  • the main cooling circuits may extend through portions of the main body 32 to cool the main body 32 .
  • the main body 32 may define a forward main cooling circuit 82 and an aft main cooling circuit 84 .
  • the main cooling circuits may have any suitable shape and may extend along any suitable path.
  • each main cooling circuit may have various branches and serpentine portions and may extend through the various portions of the main body 32 , such as through the airfoil 36 and shank 38 .
  • a cooling medium may be flowed into and through the various main cooling circuits 82 to cool the main body 32 .
  • one or more platform cooling circuits 90 may be defined in the bucket assembly 30 .
  • the platform cooling circuit 90 may be defined at least partially in the platform 34 .
  • a portion of the platform cooling circuit 90 is defined in the platform 34 , and extends through the platform 34 to cool it.
  • Other portions of the platform cooling circuit 90 may extend into the main body 32 to inlet cooling medium into the platform cooling circuit 90 (not shown) or exhaust the cooling medium therefrom.
  • a platform cooling circuit 90 may include a forward portion 92 as discussed below, an intermediate portion 94 , and/or an outlet portion 96 .
  • the outlet portion 96 may extend from the platform 34 into the main body 32 , and the forward portion 92 and intermediate portion 94 may extend through the platform 34 . Cooling medium may flow through the forward portion 92 and intermediate portion 94 , and be exhausted through the outlet portion 96 .
  • a platform cooling circuit 90 is in fluid communication with a main cooling circuit, such that cooling medium is flowed from a main cooling circuit into the platform cooling circuit 90 and/or is flowed from a platform cooling circuit 90 to a main cooling circuit.
  • the outlet portion 96 is in fluid communication with the aft main cooling circuit 84 .
  • a platform cooling circuit 90 may have any suitable path through the platform 34 .
  • the platform cooling circuit 90 or any portion thereof may be generally linear or generally curvilinear.
  • the platform cooling circuit 90 such as the intermediate portion 94 thereof, may have a generally serpentine path, as shown.
  • Such serpentine path may include alternating generally linear and generally curvilinear portions, such that cooling medium may flow back and forth through such portions as it flows through the platform cooling circuit 90 .
  • a platform cooling circuit 90 may have any suitable path through the platform 34 .
  • a platform cooling circuit 90 may further include an upper surface 102 and a lower surface 104 .
  • the upper surface 102 and lower surface 104 may be generally curvilinear, and may meet to fully define the platform cooling circuit 90 .
  • a platform cooling circuit 90 may further include one or more sidewalls (not shown). Each sidewall may extend between an upper surface 102 and a lower surface 104 .
  • Upper surfaces 102 and lower surfaces 104 according to the present disclosure may have any suitable shape and size.
  • an upper surface 102 and/or lower surface may be planer, may be curvilinear as discussed, or may include suitable bends or other disruptions.
  • An upper surface 102 and lower surface 104 along with optional sidewalls, may define any suitable cross-sectional profile for a platform cooling circuit, such as rectangular, oval, triangular, or any other suitable polygonal shape.
  • a bucket assembly 30 may further advantageously include one or more passages 110 , as shown in FIGS. 3 through 5 .
  • Each passage 100 extends between a main cooling circuit and a platform cooling circuit 90 .
  • a passage 110 may extend between a forward main cooling circuit 62 and a platform cooling circuit 90 .
  • a passage 110 may extend between an aft main cooling circuit 64 and a platform cooling circuit 90 .
  • Each passage 110 may provide fluid communication between such main cooling circuit and such platform cooling circuit 90 .
  • cooling medium may flow from the main cooling circuit into the passage 110 , and from the passage 110 to the platform cooling circuit 90 .
  • cooling medium may flow from the platform cooling circuit 90 into the passage 110 , and from the passage 110 into the main cooling circuit.
  • a passage 110 further includes end openings 112 .
  • the end openings 112 act as the inlet and outlet for the passage 110 for flow to and from the main cooling circuit and platform cooling circuit 90 .
  • an end opening 112 of the passage 110 such as the end opening 112 for flowing cooling medium between the passage 110 and platform cooling circuit 90 , is defined in the lower surface 104 of the platform cooling circuit 90 .
  • such end opening 112 is an outlet, such that cooling medium flows through the end opening 112 into the platform cooling circuit 90 from the passage 110 .
  • Such design of the passage 110 and platform cooling circuit 90 may advantageously reduce stresses at the intersection between the platform cooling circuit 90 and passage 110 .
  • the intersection between the passage 110 and platform cooling circuit 90 may be spaced from the exterior intersection between the platform 34 and shank 38 .
  • resulting bending stresses at the intersection of the passage 110 and platform cooling circuit 90 may be reduced or eliminated.
  • At least a portion of a passage 110 may extend in a generally radial direction.
  • the radial direction is the direction between the root 40 and airfoil 36 of the bucket assembly, and may be shown as a vertical direction in FIG. 3 .
  • at least a portion of a passage 110 may extend in the generally radial direction.
  • such portion may be the portion that defines an end opening 112 , such as the end opening 112 that is defined in the lower surface 104 of the platform cooling circuit 90 .
  • cooling medium flowing from the passage 110 into the platform cooling circuit 90 may further advantageously impingement cool the upper surface 102 of the platform cooling circuit 90 , thus providing improved cooling to the platform 34 .
  • the platform cooling circuit 90 may include a forward portion 92 and an intermediate portion 94 . Further, the end opening 112 of the passage 110 that is defined in the lower surface 104 of the platform cooling circuit 90 may be defined in the intermediate portion 94 .
  • the forward portion 92 may thus be that portion of the platform cooling circuit 90 that is generally upstream of such end opening 112 , such that the general flow path of cooling medium from the passage 110 into and through the platform cooling circuit 90 is away from the forward portion 92 .
  • the arrows shown in FIG. 5 illustrate one embodiment of a general flow path of cooling medium from the passage 110 into and through the platform cooling circuit 90 .
  • a portion of the cooling medium may, upon entering the platform cooling circuit 90 , flow upstream into the forward portion 92 . This cooling medium may then continue downstream, along the general flow path of the cooling medium through the intermediate portion 94 of the platform cooling circuit 90 .
  • the cooling medium 90 may further flow through an outlet portion 96 and be exhausted from the platform cooling circuit 90 .
  • a bucket assembly 30 may further include one or more exhaust passages 120 .
  • Each exhaust passage 120 may be defined in the platform 34 , such as in the aft portion 64 of the platform 34 and/or in the forward portion 62 of the platform 34 , and may be in fluid communication with the platform cooling circuit 90 .
  • an exhaust passage 120 may be in fluid communication with a forward portion 92 , intermediate portion 94 , outlet portion 96 , and/or any other suitable portion of a platform cooling circuit 90 .
  • cooling medium flowing through the platform cooling circuit 90 may flow from the platform cooling circuit 90 into an exhaust passage 120 .
  • Each exhaust passage 120 may further include an outlet 122 .
  • the outlet 122 may be defined in any suitable location on the platform 34 , such as on the aft portion 64 and/or forward portion 62 of the platform 34 .
  • an outlet 122 may be defined in the top face 66 as shown, or in the suction side slash face 74 , or in the pressure side slash face 72 as shown, or in the forward face 76 , aft face 78 , or any other suitable location on the platform 34 , such as on the aft portion 64 and/or forward portion 62 of the platform 34 .
  • Cooling medium flowed through an exhaust passage 120 may thus be exhausted through the outlet 122 of that exhaust passage 120 . Additionally, in some embodiments, such exhausted cooling medium may further advantageously act as a cooling film to cool the exterior of the platform 34 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
US13/289,146 2011-11-04 2011-11-04 Bucket assembly for turbine system Abandoned US20130115060A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US13/289,146 US20130115060A1 (en) 2011-11-04 2011-11-04 Bucket assembly for turbine system
EP12191000.4A EP2597262B1 (fr) 2011-11-04 2012-11-01 Ensemble des aubes pour système de turbine
CN2012104344574A CN103089333A (zh) 2011-11-04 2012-11-02 用于涡轮机系统的叶片组件

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/289,146 US20130115060A1 (en) 2011-11-04 2011-11-04 Bucket assembly for turbine system

Publications (1)

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US20130115060A1 true US20130115060A1 (en) 2013-05-09

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US13/289,146 Abandoned US20130115060A1 (en) 2011-11-04 2011-11-04 Bucket assembly for turbine system

Country Status (3)

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US (1) US20130115060A1 (fr)
EP (1) EP2597262B1 (fr)
CN (1) CN103089333A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150139814A1 (en) * 2013-11-20 2015-05-21 Mitsubishi Hitachi Power Systems, Ltd. Gas Turbine Blade
US9797253B2 (en) 2014-09-17 2017-10-24 General Electric Company System and method for repairing blades

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10465523B2 (en) 2014-10-17 2019-11-05 United Technologies Corporation Gas turbine component with platform cooling
US10508548B2 (en) * 2017-04-07 2019-12-17 General Electric Company Turbine engine with a platform cooling circuit

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Publication number Priority date Publication date Assignee Title
US6402471B1 (en) * 2000-11-03 2002-06-11 General Electric Company Turbine blade for gas turbine engine and method of cooling same
US20050058545A1 (en) * 2003-09-12 2005-03-17 Siemens Westinghouse Power Corporation Turbine blade platform cooling system
US20050095128A1 (en) * 2003-10-31 2005-05-05 Benjamin Edward D. Methods and apparatus for cooling gas turbine engine rotor assemblies
US7416391B2 (en) * 2006-02-24 2008-08-26 General Electric Company Bucket platform cooling circuit and method
US7513738B2 (en) * 2006-02-15 2009-04-07 General Electric Company Methods and apparatus for cooling gas turbine rotor blades
US20100232975A1 (en) * 2009-03-10 2010-09-16 Honeywell International Inc. Turbine blade platform

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US5340278A (en) * 1992-11-24 1994-08-23 United Technologies Corporation Rotor blade with integral platform and a fillet cooling passage
JP2005146858A (ja) * 2003-11-11 2005-06-09 Mitsubishi Heavy Ind Ltd ガスタービン
US7147439B2 (en) * 2004-09-15 2006-12-12 General Electric Company Apparatus and methods for cooling turbine bucket platforms
US7309212B2 (en) * 2005-11-21 2007-12-18 General Electric Company Gas turbine bucket with cooled platform leading edge and method of cooling platform leading edge
JP5281245B2 (ja) * 2007-02-21 2013-09-04 三菱重工業株式会社 ガスタービン動翼のプラットフォーム冷却構造
US8523527B2 (en) * 2010-03-10 2013-09-03 General Electric Company Apparatus for cooling a platform of a turbine component

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6402471B1 (en) * 2000-11-03 2002-06-11 General Electric Company Turbine blade for gas turbine engine and method of cooling same
US20050058545A1 (en) * 2003-09-12 2005-03-17 Siemens Westinghouse Power Corporation Turbine blade platform cooling system
US20050095128A1 (en) * 2003-10-31 2005-05-05 Benjamin Edward D. Methods and apparatus for cooling gas turbine engine rotor assemblies
US7513738B2 (en) * 2006-02-15 2009-04-07 General Electric Company Methods and apparatus for cooling gas turbine rotor blades
US7416391B2 (en) * 2006-02-24 2008-08-26 General Electric Company Bucket platform cooling circuit and method
US20100232975A1 (en) * 2009-03-10 2010-09-16 Honeywell International Inc. Turbine blade platform

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150139814A1 (en) * 2013-11-20 2015-05-21 Mitsubishi Hitachi Power Systems, Ltd. Gas Turbine Blade
US10006368B2 (en) * 2013-11-20 2018-06-26 Mitsubishi Hitachi Power Systems, Ltd. Gas turbine blade
US9797253B2 (en) 2014-09-17 2017-10-24 General Electric Company System and method for repairing blades

Also Published As

Publication number Publication date
EP2597262A1 (fr) 2013-05-29
CN103089333A (zh) 2013-05-08
EP2597262B1 (fr) 2014-08-06

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Owner name: GENERAL ELECTRIC COMPANY, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WALUNJ, JALINDAR APPA;HONKOMP, MARK STEVEN;AMARAL, SERGIO DANIEL MARQUES;SIGNING DATES FROM 20111020 TO 20111103;REEL/FRAME:027175/0593

STCB Information on status: application discontinuation

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