US20040213669A1 - Curved bucket aft shank walls for stress reduction - Google Patents

Curved bucket aft shank walls for stress reduction Download PDF

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Publication number
US20040213669A1
US20040213669A1 US10/420,868 US42086803A US2004213669A1 US 20040213669 A1 US20040213669 A1 US 20040213669A1 US 42086803 A US42086803 A US 42086803A US 2004213669 A1 US2004213669 A1 US 2004213669A1
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United States
Prior art keywords
shank
aft
bucket
wall
trailing edge
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Granted
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US10/420,868
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US6805534B1 (en
Inventor
Robert Brittingham
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General Electric Co
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General Electric Co
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Publication date
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Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRITTINGHAM, ROBERT ALAN
Priority to US10/420,868 priority Critical patent/US6805534B1/en
Priority to JP2006513141A priority patent/JP2006524301A/en
Priority to EP04760033A priority patent/EP1618287B1/en
Priority to DE602004014607T priority patent/DE602004014607D1/en
Priority to RU2005136371/06A priority patent/RU2342539C2/en
Priority to PCT/US2004/012107 priority patent/WO2004094788A1/en
Priority to TW093111266A priority patent/TW200506175A/en
Publication of US6805534B1 publication Critical patent/US6805534B1/en
Application granted granted Critical
Publication of US20040213669A1 publication Critical patent/US20040213669A1/en
Adjusted expiration legal-status Critical
Expired - Fee Related 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
    • F01D5/20—Specially-shaped blade tips to seal space between tips and stator
    • 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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
    • 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
    • F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
    • 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
    • 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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • 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
    • 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
    • F05D2250/70—Shape
    • F05D2250/71—Shape curved
    • F05D2250/711—Shape curved convex
    • 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

  • This invention relates generally to turbine blades and, specifically, to a design modification in a turbine blade aft shank wall for stress reduction.
  • sealing of the turbine bucket or blade is crucial, as parasitic leaks degrade engine performance.
  • Seal pins are typically used to reduce leaks between adjacent buckets. It is therefore also imperative that the ends of adjacent shanks join relatively closely from the concave sides to the convex sides of the buckets.
  • This invention relieves stress at the root trailing edge of a rotating turbine airfoil while maintaining adequate wall thickness between core cavities and the aft shank wall.
  • the invention also maintains mating side surfaces for sealing and leak reduction. More specifically, the invention utilizes a convexly curved aft shank wall that provides additional material between the aft shank wall and the nearest cooling cavity, and that also enables increased overhang of the trailing edge of the airfoil.
  • the aft wall is curved from one side of the bucket to the other, so as to allow adjacent edges to align and thus facilitate sealing between adjacent buckets.
  • the invention relates to a turbine bucket comprising an airfoil portion and a shank portion with a substantially horizontal platform radially therebetween, the shank portion having a forward shank wall and an aft shank wall; at least the aft shank wall convexly curved from one side of the bucket to an opposite side of the bucket.
  • the invention in another aspect, relates to a turbine bucket comprising an airfoil portion and a shank portion with a substantially horizontal platform radially therebetween, the shank portion having a forward shank wall and an aft shank wall; the aft shank wall convexly curved from one side of the bucket to an opposite side of the bucket; wherein the internal cooling circuit includes a plurality of cavities in the shank portion and the airfoil portion and wherein one of the cavities lies adjacent the aft shank wall; and further wherein the airfoil portion includes a leading edge and a trailing edge, the trailing edge overhanging the aft shank wall.
  • FIG. 1 is a perspective view of a conventional turbine bucket
  • FIG. 2 is an enlarged partial perspective of the bucket shown in FIG. 1, sectioned at a location of minimum wall thickness between an aft core cavity and the aft shank wall of the bucket;
  • FIG. 3 is a simplified partial section, in plan, of a pair of conventional buckets shown in side-by-side relationship as installed on a turbine wheel;
  • FIG. 4 is a view similar to FIG. 3, but sectioned through the airfoil portions of the buckets;
  • FIG. 5 is a partial section in plan of two adjacent buckets, with curved aft shank walls in accordance with an exemplary embodiment of this invention.
  • FIG. 6 is a view similar to FIG. 5 but sectioned through the airfoil portions of the buckets.
  • FIG. 1 illustrates a conventional turbine bucket 10 that includes generally a shank portion 12 , an attachment portion 14 , a platform portion 16 and an airfoil portion (or simply, “airfoil” 18 ).
  • the platform portion 16 is radially between the shank portion 12 and the airfoil portion 18 , with the airfoil portion 18 joined to the upper or radially outer surface of the platform.
  • So called “angel wings” or sealing flanges 20 , 22 project axially away from the forward and aft walls 24 , 26 , respectively, of the shank portion 12 .
  • the attachment portion 14 is shown to be of the generally “axial entry” type and includes a “firtree” 28 , (the attachment portion could also be in the form of a dovetail or other surface locking configuration) designed to mate with a complementary-shaped groove (not shown) on the periphery of the turbine rotor wheel. It will be understood that the invention described herein is not limited by the configuration of the attachment portion 14 .
  • the airfoil portion 18 has a leading edge 30 and a trailing edge 32 , with a concave surface 34 on the pressure side of the airfoil portion.
  • the bucket 10 is formed with an internal cooling circuit that includes cooling passages or cavities 36 in the shank portion 12 that communicate with larger inlet and outlet manifolds (not shown) in the shank portion attachment 14 and that extend upwardly into the airfoil portion 18 .
  • the cavity 38 that is located adjacent the aft wall 26 .
  • FIGS. 2 and 3 illustrate the close proximity of the cavity 38 to the aft shank wall 26 with a relatively thin ligament 48 therebetween.
  • FIG. 3 also illustrates the manner in which adjacent buckets 10 and 110 are closely aligned when mounted on a turbine wheel, with respective corner edges 40 , 42 of bucket 10 closely aligned with corner edges 140 , 142 of bucket 110 .
  • the space between side surfaces 44 and 144 may be on the order of about 0.040 inch, and as mentioned above, seal pins (not shown) are typically located within this space to prevent leakage between the adjacent buckets. Specifically, there are two seal pins, one oriented horizontally as mentioned above, and the other oriented radially, mating between radial surfaces adjacent to edges 42 and 142 of FIG. 3.
  • FIG. 4 is similar to FIG. 3 but also shows the airfoil portions 18 , 118 of the respective buckets 10 , 110 .
  • the extent of overhang of the trailing edge 32 relative to the aft shank wall 26 is the extent of overhang of the trailing edge 32 relative to the aft shank wall 26 . It will be appreciated that simply extending the aft wall to increase the width of ligament 48 between cavity 38 and the aft shank wall 26 would impair the ability to have an acceptable overhang.
  • the bucket 210 is formed with forward and aft shank walls 224 , 226 .
  • the aft shank wall 226 is convexly curved from side to side, i.e., such that the convex surface projects axially relative to the turbine rotor centerline indicated at 46 .
  • the trailing edge 232 is afforded considerably more overhang vis-a-vis the aft shank wall 226 than in the prior design (see FIG. 4).
  • the corner edges 240 , 242 of the bucket 210 may still correctly align with facing corner edges 340 , 342 of adjacent bucket 310 .

Abstract

A turbine bucket comprising an airfoil portion and a shank portion with a substantially horizontal platform radially therebetween, the shank portion having a forward shank wall and an aft shank wall; at least the aft shank wall convexly curved from one side of the bucket to an opposite side of the bucket.

Description

    BACKGROUND OF THE INVENTION
  • This invention relates generally to turbine blades and, specifically, to a design modification in a turbine blade aft shank wall for stress reduction. [0001]
  • When a bucket in a power systems turbine or a blade in an aircraft engine requires a hollow core for cooling air, the proximity of the core cooling cavities to the forward and rear shank walls (coverplates) can be problematic. For example, the cooling cavity closest to the aft shank wall may create a barely sufficient, thin metal ligament between the aft wall and the cooling cavity, causing a high stress location and potentially low part life. Additionally, this situation may preclude the shank wall from undercutting the airfoil trailing edge, a desired condition for airfoil root trailing edge stress relief. In other words, the desire to have the trailing edge overhang the aft shank wall often competes with the requirement to maintain adequate wall thickness between the core cavity and the aft shank wall. [0002]
  • Reduction of stress, particularly in the airfoil root trailing edge, requires both thermal management of the part to reduce thermal stress, and a geometry designed to relieve the loading of the airfoil trailing edge. [0003]
  • In a related matter, sealing of the turbine bucket or blade is crucial, as parasitic leaks degrade engine performance. Seal pins are typically used to reduce leaks between adjacent buckets. It is therefore also imperative that the ends of adjacent shanks join relatively closely from the concave sides to the convex sides of the buckets. [0004]
    • BRIEF DESCRIPTION OF THE INVENTION
  • This invention relieves stress at the root trailing edge of a rotating turbine airfoil while maintaining adequate wall thickness between core cavities and the aft shank wall. The invention also maintains mating side surfaces for sealing and leak reduction. More specifically, the invention utilizes a convexly curved aft shank wall that provides additional material between the aft shank wall and the nearest cooling cavity, and that also enables increased overhang of the trailing edge of the airfoil. The aft wall is curved from one side of the bucket to the other, so as to allow adjacent edges to align and thus facilitate sealing between adjacent buckets. [0005]
  • It will be appreciated that for some bucket applications, it may be desirable to provide a convexly curved surface on the forward shank wall as well. [0006]
  • In one aspect, therefore, the invention relates to a turbine bucket comprising an airfoil portion and a shank portion with a substantially horizontal platform radially therebetween, the shank portion having a forward shank wall and an aft shank wall; at least the aft shank wall convexly curved from one side of the bucket to an opposite side of the bucket. [0007]
  • In another aspect, the invention relates to a turbine bucket comprising an airfoil portion and a shank portion with a substantially horizontal platform radially therebetween, the shank portion having a forward shank wall and an aft shank wall; the aft shank wall convexly curved from one side of the bucket to an opposite side of the bucket; wherein the internal cooling circuit includes a plurality of cavities in the shank portion and the airfoil portion and wherein one of the cavities lies adjacent the aft shank wall; and further wherein the airfoil portion includes a leading edge and a trailing edge, the trailing edge overhanging the aft shank wall. [0008]
  • The invention will now be described in detail in connection with the drawings identified below.[0009]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a perspective view of a conventional turbine bucket; [0010]
  • FIG. 2 is an enlarged partial perspective of the bucket shown in FIG. 1, sectioned at a location of minimum wall thickness between an aft core cavity and the aft shank wall of the bucket; [0011]
  • FIG. 3 is a simplified partial section, in plan, of a pair of conventional buckets shown in side-by-side relationship as installed on a turbine wheel; [0012]
  • FIG. 4 is a view similar to FIG. 3, but sectioned through the airfoil portions of the buckets; [0013]
  • FIG. 5 is a partial section in plan of two adjacent buckets, with curved aft shank walls in accordance with an exemplary embodiment of this invention; and [0014]
  • FIG. 6 is a view similar to FIG. 5 but sectioned through the airfoil portions of the buckets.[0015]
    • DETAILED DESCRIPTION OF THE INVENTION
  • FIG. 1 illustrates a [0016] conventional turbine bucket 10 that includes generally a shank portion 12, an attachment portion 14, a platform portion 16 and an airfoil portion (or simply, “airfoil” 18). In terms of a bucket as mounted on a turbine rotor wheel, the platform portion 16 is radially between the shank portion 12 and the airfoil portion 18, with the airfoil portion 18 joined to the upper or radially outer surface of the platform. So called “angel wings” or sealing flanges 20, 22 project axially away from the forward and aft walls 24, 26, respectively, of the shank portion 12. The attachment portion 14 is shown to be of the generally “axial entry” type and includes a “firtree” 28, (the attachment portion could also be in the form of a dovetail or other surface locking configuration) designed to mate with a complementary-shaped groove (not shown) on the periphery of the turbine rotor wheel. It will be understood that the invention described herein is not limited by the configuration of the attachment portion 14. The airfoil portion 18 has a leading edge 30 and a trailing edge 32, with a concave surface 34 on the pressure side of the airfoil portion.
  • As best seen in FIG. 2, the [0017] bucket 10 is formed with an internal cooling circuit that includes cooling passages or cavities 36 in the shank portion 12 that communicate with larger inlet and outlet manifolds (not shown) in the shank portion attachment 14 and that extend upwardly into the airfoil portion 18. Of particular concern here is the cavity 38 that is located adjacent the aft wall 26. FIGS. 2 and 3 illustrate the close proximity of the cavity 38 to the aft shank wall 26 with a relatively thin ligament 48 therebetween. FIG. 3 also illustrates the manner in which adjacent buckets 10 and 110 are closely aligned when mounted on a turbine wheel, with respective corner edges 40, 42 of bucket 10 closely aligned with corner edges 140, 142 of bucket 110. The space between side surfaces 44 and 144 may be on the order of about 0.040 inch, and as mentioned above, seal pins (not shown) are typically located within this space to prevent leakage between the adjacent buckets. Specifically, there are two seal pins, one oriented horizontally as mentioned above, and the other oriented radially, mating between radial surfaces adjacent to edges 42 and 142 of FIG. 3.
  • FIG. 4 is similar to FIG. 3 but also shows the [0018] airfoil portions 18, 118 of the respective buckets 10, 110. Of note in this Figure is the extent of overhang of the trailing edge 32 relative to the aft shank wall 26. It will be appreciated that simply extending the aft wall to increase the width of ligament 48 between cavity 38 and the aft shank wall 26 would impair the ability to have an acceptable overhang.
  • Turning now to FIG. 5, the [0019] bucket 210, otherwise similar to buckets 10 and 110, is formed with forward and aft shank walls 224, 226. In accordance with this invention, the aft shank wall 226 is convexly curved from side to side, i.e., such that the convex surface projects axially relative to the turbine rotor centerline indicated at 46. This effectively thickens the ligament 248 between the closest cooling cavity 238 and the aft shank wall 226. In addition, as made apparent in FIG. 6, the trailing edge 232 is afforded considerably more overhang vis-a-vis the aft shank wall 226 than in the prior design (see FIG. 4). At the same time, the corner edges 240, 242 of the bucket 210 may still correctly align with facing corner edges 340, 342 of adjacent bucket 310.
  • While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. [0020]

Claims (12)

What is claimed is:
1. A turbine bucket comprising an airfoil portion and a shank portion with a substantially horizontal platform radially therebetween, said shank portion having a forward shank wall and an aft shank wall; at least said aft shank wall convexly curved from one side of the bucket to an opposite side of the bucket.
2. The turbine bucket of claim 1 wherein said shank portion is formed with one or more angel wings projecting from said aft shank wall, and wherein said aft shank wall is convexly curved in an area below said platform but above an uppermost of said one or more angel wings.
3. The turbine bucket of claim 1 wherein said bucket is formed with internal cooling cavities.
4. The turbine bucket of claim 1 wherein said airfoil portion includes a leading edge and a trailing edge and said aft shank wall lies adjacent said trailing edge.
5. The turbine bucket of claim 3 wherein said internal cooling cavities include a plurality of cavities in said shank portion and said airfoil portion and wherein one of said cavities lies adjacent said aft shank wall.
6. The turbine bucket of claim 1 wherein said airfoil portion includes a leading edge and a trailing edge, and wherein said trailing edge overhangs said aft shank wall.
7. The turbine bucket of claim 2 wherein opposite sides of said bucket are substantially straight.
8. The turbine bucket of claim 3 wherein said airfoil portion includes a leading edge and a trailing edge, and wherein said trailing edge overhangs said aft shank wall.
9. The turbine bucket of claim 2 wherein said shank portion also includes a pair of substantially straight side walls.
10. A turbine bucket comprising an airfoil portion and a shank portion with a substantially horizontal platform radially therebetween, said shank portion having a forward shank wall and an aft shank wall; said aft shank wall convexly curved from one side of the bucket to an opposite side of the bucket; wherein said internal cooling circuit includes a plurality of cavities in said shank portion and said airfoil portion and wherein one of said cavities lies adjacent said aft shank wall; and further wherein said airfoil portion includes a leading edge and a trailing edge, said trailing edge overhanging said aft shank wall.
11. The turbine bucket of claim 10 wherein said shank portion is formed with one or more angel wings projecting from said aft shank wall, and wherein said aft shank wall is convexly curved in an area below said platform but above an uppermost of said one or more angel wings.
12. The turbine bucket of claim 11 wherein said airfoil portion includes a leading edge and a trailing edge, and wherein said trailing edge overhangs said aft shank wall.
US10/420,868 2003-04-23 2003-04-23 Curved bucket aft shank walls for stress reduction Expired - Fee Related US6805534B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US10/420,868 US6805534B1 (en) 2003-04-23 2003-04-23 Curved bucket aft shank walls for stress reduction
RU2005136371/06A RU2342539C2 (en) 2003-04-23 2004-04-20 Turbine blade with deflected rear root walls to reduce stress (versions)
EP04760033A EP1618287B1 (en) 2003-04-23 2004-04-20 Turbine bucket with curved aft shank walls for stress reduction
DE602004014607T DE602004014607D1 (en) 2003-04-23 2004-04-20 TURBINE BUCKET WITH CURVED REAR WINDOWS FOR TEMPERING
JP2006513141A JP2006524301A (en) 2003-04-23 2004-04-20 Turbine bucket with curved rear shank wall for stress reduction
PCT/US2004/012107 WO2004094788A1 (en) 2003-04-23 2004-04-20 Turbine bucket with curved aft shank walls for stress reduction
TW093111266A TW200506175A (en) 2003-04-23 2004-04-22 Curved bucket aft shank walls for stress reduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/420,868 US6805534B1 (en) 2003-04-23 2003-04-23 Curved bucket aft shank walls for stress reduction

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US6805534B1 US6805534B1 (en) 2004-10-19
US20040213669A1 true US20040213669A1 (en) 2004-10-28

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US (1) US6805534B1 (en)
EP (1) EP1618287B1 (en)
JP (1) JP2006524301A (en)
DE (1) DE602004014607D1 (en)
RU (1) RU2342539C2 (en)
TW (1) TW200506175A (en)
WO (1) WO2004094788A1 (en)

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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
US7416391B2 (en) * 2006-02-24 2008-08-26 General Electric Company Bucket platform cooling circuit and method
US10087762B2 (en) 2011-07-11 2018-10-02 Hamilton Sundstrand Corporation Scallop curvature for radial turbine wheel
US8936439B2 (en) 2011-07-11 2015-01-20 Hamilton Sundstrand Corporation Radial turbine backface curvature stress reduction
US9127561B2 (en) * 2012-03-01 2015-09-08 General Electric Company Turbine bucket with contoured internal rib
US9033669B2 (en) 2012-06-15 2015-05-19 General Electric Company Rotating airfoil component with platform having a recessed surface region therein

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Publication number Publication date
EP1618287B1 (en) 2008-06-25
US6805534B1 (en) 2004-10-19
WO2004094788A1 (en) 2004-11-04
TW200506175A (en) 2005-02-16
RU2005136371A (en) 2006-03-20
EP1618287A1 (en) 2006-01-25
RU2342539C2 (en) 2008-12-27
JP2006524301A (en) 2006-10-26
DE602004014607D1 (en) 2008-08-07

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