EP1749970B1 - Turbine airfoil platform extension for low buttress stress - Google Patents
Turbine airfoil platform extension for low buttress stress Download PDFInfo
- Publication number
- EP1749970B1 EP1749970B1 EP20060252876 EP06252876A EP1749970B1 EP 1749970 B1 EP1749970 B1 EP 1749970B1 EP 20060252876 EP20060252876 EP 20060252876 EP 06252876 A EP06252876 A EP 06252876A EP 1749970 B1 EP1749970 B1 EP 1749970B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- platform
- thickness
- point
- buttress
- blade
- 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.)
- Active
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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
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
- F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
-
- 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
- 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
Description
- The present invention relates to a turbine blade having a platform provided with additional material for reducing stress acting on the blade by distributing loads away from a buttress portion of the turbine blade.
- Referring now to
FIGS. 1 through 3 of the drawings, there is shown a turbine blade construction used in gas turbine engines. Theturbine blade 30 has aplatform 32, an airfoil portion 34 (only a portion of which is shown) radially extending from theplatform 32, and anattachment portion 36. The attachment portion typically includes adovetail portion 38 for connecting theblade 30 to a rotating disk (not shown), aneck portion 40, and abuttress portion 42 which extends between theneck portion 40 and anunderside 44 of theplatform 32. The lower speeds and temperatures faced by certain blades allow the airfoil portion to have short root necks and buttresses that adjoin to serrations. Thebuttress portion 42 serves to minimize secondary flow leakage. Blades which face higher stress and temperature have airfoils which use side plates to cover the leakage area between the buttress and the serrations. - Some turbine blades have a relatively large leading edge platform which is necessary to minimize flowpath leakage between the blade and vane. The large overhang of the platform, high rotor speed, short root neck, and relatively high temperature create a stress concentration where the upper serration meets the suction side and pressure side buttresses.
- In order to reduce the stress on the buttress, there is needed a way to redistribute the load path away from the buttress.
- A turbine blade having the features of the preamble of claim 1 is disclosed in
US-B1-6506016 . - A turbine blade of the present invention is provided with a system for redistributing a load path away from the buttress portion of the turbine blade.
- In accordance with the present invention, there is provided a blade as set forth in claim 1.
- Other details of the turbine airfoil platform platypus for low buttress stress, as well as other advantages thereto, are set forth in the following detailed description and the accompanying drawings wherein like reference numerals depict like elements.
-
-
FIG. 1 is a side view of a portion of a prior art turbine blade; -
FIG. 2 is a perspective view from the bottom of a leading edge portion of a platform and buttress used in a prior art turbine blade; -
FIG. 3 is a view showing the load path in a prior art turbine blade; -
FIG. 4 is a perspective view from the bottom of a turbine blade in accordance with the present invention; -
FIGS. 5 and 6 are side views of a turbine blade in accordance with the present invention; -
FIG. 7 is a bottom view of the turbine blade ofFIGS. 4 through 6 showing the load path distribution in the turbine blade of the present invention; and -
FIG. 8 is a contour map of an exemplary system for distributing the load path in a turbine blade. - Referring now to
FIGS. 4 through 8 , there is shown a portion of aturbine blade 100 in accordance with the present invention. Theturbine blade 100 has aplatform 102, anairfoil portion 104 radially extending from afirst side 106 of theplatform 102, and anattachment portion 108 extending from a second side orunderside 110 of theplatform 102. Theattachment portion 108 includes adovetail portion 112 for securing theturbine blade 100 in a slot (not shown) in a rotor (not shown), such as a disk. Theattachment portion 108 further includes aneck portion 114 between thedovetail portion 112 and thesecond side 110 of theplatform 102. Still further, theattachment portion 108 has abuttress 116 between thesecond side 110 of theplatform 102 and the leading end of theneck portion 114. During operation, thebuttress 116 as previously discussed is subject to stress. - The
platform 102 has a leadingedge 120, asuction side 122, a leadingedge root face 123, and apressure side 124. Theplatform leading edge 120 has a thickness T1. Thesuction side 122 and thepressure side 124 each have a thickness T2. The platform further has a centrallongitudinal axis 126. - In accordance with the present invention, the leading edge of the
platform 102 is provided withadditional material 140 so as to redistribute the load away from thebuttress 116 towards the center of the leadingedge root face 123. Thisadditional material 140 is preferably the same material that is being used to form theplatform 102 and theturbine blade 100. Theadditional material 140 may be formed during the casting of theturbine blade 100. In a preferred embodiment of the present invention, theadditional material 140 has a shape similar to that of a platypus bill. - Referring now in particular to
FIG. 8 , there is shown a contour map of an exemplary additional material formation which comprises a system for redistributing the loads away from thebuttress 116. The thicknesses of theadditional material 140 for the various points 1 - 24 shown inFIG. 8 are listed in Table I. The thicknesses are given as normalized percentages with the largest thickness at the thickest point 5 being 100%.TABLE I PT NO. 1 2 3 4 5 6 7 8 THICKNESS 41.8 53.8 70.6 93.5 100 73.5 57.1 45.3 PT NO. 9 10 11 12 13 14 15 16 THICKNESS 34.1 43.5 52.4 57.7 55.9 48.2 38.8 31.2 PT NO. 17 18 19 20 21 22 23 24 THICKNESS 30.0 34.7 38.9 40.6 38.8 34.1 30.0 27.1 - The thicknesses 1 - 24 are taken along three lines A, B, and C in the region between the
front root face 121 and the leadingedge 120. Line A is located closest to thebuttress 116 at a normalized distance of about 13.51% from thefront root face 121. Line B is located at a normalized distance of about 47.30% from thefront root face 121 and line C is located at a normalized distance of about 88.59% from thefront root face 121. - As can be seen from
FIG. 8 , the thickness of theadditional material 140 on thesecond side 110 gradually increases from both thesuction side 122 and thepressure side 124 towards a maximum point 5 (on line A), 13 (on line B), and 21 (on line C), which maximum point is preferably offset from the centrallongitudinal axis 126. As can also be seen fromFIG. 8 , the thickness of theplatform 102 on thesecond side 110 gradually increases from points along line C, nearest to the leadingedge 120, to the point 5. - The
additional material 140 is advantageous in that it distributes loads, both stress and strain, away from thebuttress 116 towards the center of leadingedge root face 123. This is different from conventional blades where the loads are funneled into the middle and distributed along the entire width of the leading edge of the platform.
Claims (15)
- A blade (100) for use in a gas turbine engine comprising:a platform (102), an airfoil portion (104) extending radially from a first side (106) of the platform (102), and an attachment portion (108) extending from a second side (110) of the platform (102) said platform (102) having a pressure side (124), a suction side (122), a leading edge (120) and a thickness (T1) at said leading edge (120);said attachment portion (108) including a buttress (116) which abuts said second side (110) of the platform (102); andcharacterised by:said second side (110) including means (140) for redistributing load away from the buttress (116), said means comprising a contoured configuration wherein a thickness increases from a pressure side or a suction side of the platform and including a first region having a first thickness greater than said thickness (T1) at said leading edge and a second region having a second thickness greater than said first thickness.
- The blade of claim 1, wherein said platform (102) has a suction side (122) and a pressure side (124) and wherein said load redistributing means (140) comprise means for directing the load outwardly towards a center of a leading edge root face (123).
- The blade of claim 1 or 2, wherein said platform (102) has a central longitudinal axis (126) and said first and second regions are offset from said central longitudinal axis (126).
- The blade of claim 3, wherein said first region is near the leading edge (120) of said platform and said second region abuts said buttress (116).
- The blade of any preceding claim, wherein said suction side (122) has a thickness (T2) and said means for redistributing said load comprises a third region offset from a central point of said buttress (116) and said thickness in said third region is greater than said thickness (T2) at said suction side (122).
- The blade of claim 5, wherein said platform (1.02) has a thickness which increases from said suction side (122) to said third region.
- The blade of claim 5 or 6, wherein said pressure side (124) has a thickness (T2) and said thickness at said third region is greater than said thickness (T2) at said pressure side (124).
- The blade of claim 7, wherein said thickness of said platform (102) increases from said pressure side (124) to said third region.
- The blade according to any preceding claim, wherein said load redistributing means comprises additional material (140) located on the second side (110) of the platform (102).
- The blade according to any preceding claim, wherein said second side (110) is an underside of said platform (102).
- The blade according to claim 1 wherein:said attachment portion (108) includes a neck portion (114) extending from the second side (110) of said platform (102); andsaid buttress (116) is positioned adjacent an intersection of said neck portion (114) and said second side (110);and said load redistributing means comprises additional material (140) formed on the second side (110) of said platform (102).
- The turbine blade according to claim 11, further comprising;
said additional material (140) beginning at a first point near said leading edge (120) and increasing in thickness to a second point abutting said buttress (116);
said additional material (140) beginning at a third point adjacent said suction side (122) and increasing in thickness from said third point to said second point; and
said additional material (140) further beginning at a fourth point adjacent said pressure side (124) and increasing in thickness from said fourth point to said second point. - The turbine blade according to claim 12, further comprising said platform (102) having a central longitudinal axis (126) and said second point being offset from said central longitudinal axis (126).
- The turbine blade according to claim 13, wherein said first point is offset from said central longitudinal axis (126).
- The turbine blade according to any of claims 11 to 14, wherein said airfoil portion (104) is an overhung airfoil portion.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/197,162 US20070031260A1 (en) | 2005-08-03 | 2005-08-03 | Turbine airfoil platform platypus for low buttress stress |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1749970A2 EP1749970A2 (en) | 2007-02-07 |
EP1749970A3 EP1749970A3 (en) | 2010-05-26 |
EP1749970B1 true EP1749970B1 (en) | 2015-05-13 |
Family
ID=37387422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20060252876 Active EP1749970B1 (en) | 2005-08-03 | 2006-06-02 | Turbine airfoil platform extension for low buttress stress |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070031260A1 (en) |
EP (1) | EP1749970B1 (en) |
JP (1) | JP2007040295A (en) |
CN (1) | CN1908379A (en) |
SG (1) | SG130114A1 (en) |
TW (1) | TW200710319A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010004854A1 (en) * | 2010-01-16 | 2011-07-21 | MTU Aero Engines GmbH, 80995 | Blade for a turbomachine and turbomachine |
US9976433B2 (en) * | 2010-04-02 | 2018-05-22 | United Technologies Corporation | Gas turbine engine with non-axisymmetric surface contoured rotor blade platform |
WO2019136672A1 (en) * | 2018-01-11 | 2019-07-18 | 贵州智慧能源科技有限公司 | Turbine blade flange plate based on spline curve design |
FR3107301B1 (en) * | 2020-02-19 | 2022-03-11 | Safran Aircraft Engines | blade for a moving bladed wheel of an aircraft turbomachine comprising a sealing spoiler with optimized scalable section |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2807436A (en) * | 1952-03-25 | 1957-09-24 | Gen Motors Corp | Turbine wheel and bucket assembly |
US4259037A (en) * | 1976-12-13 | 1981-03-31 | General Electric Company | Liquid cooled gas turbine buckets |
GB2228541B (en) * | 1989-02-23 | 1993-04-14 | Rolls Royce Plc | Device for damping vibrations in turbomachinery blades |
US5302085A (en) * | 1992-02-03 | 1994-04-12 | General Electric Company | Turbine blade damper |
FR2712631B1 (en) * | 1993-11-19 | 1998-08-21 | Gen Electric | Rotor fin and rotor disc-fin assembly comprising such a fin. |
FR2743845B1 (en) * | 1996-01-23 | 1998-02-20 | Snecma | MOBILE BLOWER BLADE WITH SECURITY PROFILE |
US6158962A (en) * | 1999-04-30 | 2000-12-12 | General Electric Company | Turbine blade with ribbed platform |
US6511294B1 (en) * | 1999-09-23 | 2003-01-28 | General Electric Company | Reduced-stress compressor blisk flowpath |
US6561761B1 (en) * | 2000-02-18 | 2003-05-13 | General Electric Company | Fluted compressor flowpath |
US6422820B1 (en) * | 2000-06-30 | 2002-07-23 | General Electric Company | Corner tang fan blade |
US6506016B1 (en) * | 2001-11-15 | 2003-01-14 | General Electric Company | Angel wing seals for blades of a gas turbine and methods for determining angel wing seal profiles |
FR2851285B1 (en) * | 2003-02-13 | 2007-03-16 | Snecma Moteurs | REALIZATION OF TURBINES FOR TURBOMACHINES HAVING DIFFERENT ADJUSTED RESONANCE FREQUENCIES AND METHOD FOR ADJUSTING THE RESONANCE FREQUENCY OF A TURBINE BLADE |
-
2005
- 2005-08-03 US US11/197,162 patent/US20070031260A1/en not_active Abandoned
-
2006
- 2006-04-24 TW TW095114575A patent/TW200710319A/en unknown
- 2006-05-29 JP JP2006147671A patent/JP2007040295A/en active Pending
- 2006-06-02 CN CNA2006100887133A patent/CN1908379A/en active Pending
- 2006-06-02 EP EP20060252876 patent/EP1749970B1/en active Active
- 2006-08-02 SG SG200605221-1A patent/SG130114A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
EP1749970A2 (en) | 2007-02-07 |
US20070031260A1 (en) | 2007-02-08 |
CN1908379A (en) | 2007-02-07 |
EP1749970A3 (en) | 2010-05-26 |
SG130114A1 (en) | 2007-03-20 |
JP2007040295A (en) | 2007-02-15 |
TW200710319A (en) | 2007-03-16 |
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