EP2350441A1 - Leitschaufel für eine gasturbine und zugehörige gasturbine - Google Patents
Leitschaufel für eine gasturbine und zugehörige gasturbineInfo
- Publication number
- EP2350441A1 EP2350441A1 EP09755892A EP09755892A EP2350441A1 EP 2350441 A1 EP2350441 A1 EP 2350441A1 EP 09755892 A EP09755892 A EP 09755892A EP 09755892 A EP09755892 A EP 09755892A EP 2350441 A1 EP2350441 A1 EP 2350441A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slot
- gas turbine
- trailing edge
- vane
- guide vane
- 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.)
- Granted
Links
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 claims abstract description 25
- 239000002826 coolant Substances 0.000 claims abstract description 6
- 230000008646 thermal stress Effects 0.000 claims abstract description 6
- 230000001154 acute effect Effects 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 abstract 1
- 239000000446 fuel Substances 0.000 description 7
- 238000007789 sealing Methods 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 102100031118 Catenin delta-2 Human genes 0.000 description 3
- 101000922056 Homo sapiens Catenin delta-2 Proteins 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical compound FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using 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
- F05D2240/10—Stators
- F05D2240/12—Fluid guiding means, e.g. vanes
- F05D2240/122—Fluid guiding means, e.g. vanes related to the trailing edge of a stator vane
-
- 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
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
-
- 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
- F05D2260/00—Function
- F05D2260/94—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
- F05D2260/941—Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF] particularly aimed at mechanical or thermal stress reduction
Definitions
- the present invention relates to the field of gas turbine technology. It relates to a guide vane for a gas turbine according to the preamble of claim 1.
- Such a gas turbine which has become known in the art as GT24 / 26, for example, from an article by Joos, F. et al., "Field Experience of the Sequential Combustion System for the ABB GT24 / GT26 Gas Turbine Family", IGTI / ASME 98-GT-220, 1998 Sweden.
- the local Fig. 1 shows the basic structure of such a gas turbine, wherein the local Fig. 1 is reproduced in the present application as Fig. 1. Furthermore, such a gas turbine from EP-B1 - 0 620 362.
- FIG. 1 shows a gas turbine 10 with sequential combustion, in which along an axis 19, a compressor 1 1, a first combustion chamber 14, a high-pressure turbine (HDT) 15, a second combustion chamber 17 and a low-pressure turbine (NDT) 18 are arranged.
- the compressor 1 1 and the two turbines 15, 18 are part of a rotor which rotates about the axis 19.
- the compressor 1 1 sucks in air and compresses it.
- the compressed air flows into a plenum and flows in from there
- Premix burner where this air is mixed with at least one fuel, fuel supplied at least via the fuel supply 12.
- Such Premix burners are fundamentally apparent from EP-A1-0 321 809 or EP-A2-0 704 657.
- the compressed air flows into the premix burners, where the mixing, as stated above, takes place with at least one fuel.
- This fuel / air mixture then flows into the first combustion chamber 14, into which this mixture passes to form a stable flame front for combustion.
- the resulting hot gas is partially relaxed in the subsequent high-pressure turbine 15 under working performance and then flows into the second combustion chamber 17, where a further fuel supply 16 takes place. Due to the high temperatures, which still has the hot gas partially released in the high-pressure turbine 15, combustion takes place in the second combustion chamber 17, which combustion is based on autoignition.
- the hot gas reheated in the second combustion chamber 17 is then expanded in a multistage low-pressure turbine 18.
- the low-pressure turbine 18 comprises a plurality of rows of blades and vanes arranged alternately in the flow direction, which are arranged alternately.
- the guide vanes of the third row of guide vanes in the direction of flow are designated in FIG. 1 by the reference numeral 20 '.
- a gaseous cooling medium eg compressed air from the compressor of the gas turbine is shown or supplied with steam.
- the cooling medium is sent through cooling channels formed in the blade (often in serpentines) and / or at different points of the blade through holes (holes, Slits) to form a cooling film, particularly on the outside of the blade (film cooling)
- An example of such a cooled blade is described and illustrated in US-A-5,813,835.
- the guide blade 20 ' accordinging to FIG. 1 has an airfoil extending in the radial direction between a blade head and a cover plate, wherein the airfoil extends transversely to the direction of the hot gas flow with a pressure side and a suction side between a front edge and a trailing edge and on the pressure side provided in front of the trailing edge is a cooling slot of the type described above, running parallel to the trailing edge, through which a cooling medium can emerge from the guide vane over the entire length of the vane and cool the trailing edge of the vane.
- the trailing edge of the vane must be made comparatively thin. If, during operation, the blade end of the vane, which abuts the rotor as a result of sealing, is subjected to considerable mechanical forces on the trailing edge of the airfoil, resulting in cracks at the junction between the trailing edge and the inner platform and due to the small thickness of the trailing edge so that an undesirable limitation of the life can lead.
- the invention aims to remedy this situation. It is therefore an object of the invention to provide a guide vane of the type mentioned, in which the disadvantages of the previous solution can be avoided, and which is characterized overall by a not impaired due to the thin trailing end life.
- the object is solved by the entirety of the features of claim 1.
- Essential for the inventive solution is that means for reducing the thermal stresses are provided below the trailing edge and the cooling slot on the inner platform. By this means it is ensured that without changing the blade geometry, in particular without increasing the wall or material thicknesses, solely by a "decoupling" between the blade head and blade trailing edge, the life of the vane can be favorably influenced.
- the means for reducing the thermal stresses comprise a slot extending through the inner platform, which is in particular substantially parallel to the plane of the inner platform and has a cross-sectional profile of the shape of a keyhole, with a parallel-sided wall portion and a round, in particular circular, end section arranged at the bottom of the slot.
- the blade head has a quadrangular base surface, that the trailing edge opens into the blade head with the cooling slot arranged in front of it at one of the four corners, and that the slot intersects this corner.
- the end portion of the slot with the side walls of the inner platform includes an acute angle, in particular such between 30 ° and 40 °.
- the slot has a width of less than 1 mm in the region of the wall section, and the end section is formed circular with a radius greater than 1 mm.
- the slot portion of the wall portion has a width of about 0.4 mm, and the end portion is formed circular with a radius of about 1, 25 mm.
- the cooling slot in the guide vane is produced by casting.
- the guide vane according to the invention is advantageously used in a gas turbine, wherein the vane is arranged in a turbine of the gas turbine.
- the gas turbine is preferably a gas turbine with sequential combustion, the first combustion chamber with a downstream
- High-pressure turbine and a second combustion chamber having a downstream low-pressure turbine wherein the guide vane is arranged in the low-pressure turbine.
- the low-pressure turbine has a plurality of rows of guide vanes downstream of one another in the flow direction, and the guide vane is arranged in a middle row of guide vanes.
- Fig. 1 shows the basic structure of a gas turbine with sequential
- FIG. 2 shows a perspective side view of a guide vane for the third row of guide vanes in the low-pressure turbine of a gas turbine with sequential combustion according to FIG. 1 according to a preferred exemplary embodiment of the invention
- Fig. 3 is another side perspective view of the blade of Fig. 2;
- Flow direction (IV in Fig. 2); 5 shows the section through the inner platform in the plane VV in Fig. 4, and
- FIGS. 2 and 3 show, in different perspective side views, a guide vane for the third row of guide vanes in the low-pressure turbine of a gas turbine with sequential combustion according to FIG. 1 in accordance with a preferred exemplary embodiment of the invention.
- the vane 20 comprises a curved airfoil 22 in the longitudinal direction (in radial
- a cooling slot 29 extending parallel to the trailing edge 28 is arranged shortly before the trailing edge 28, through which cooling air exits from the blade interior and cools the blade area between the cooling slot 29 and the trailing edge 28 and the trailing edge 28 itself.
- the vane 20 is secured by means of the formed on the top of the cover plate 21 hook-shaped fastening elements 24 and 25 on the turbine housing, while it rests sealingly with the blade head 23 on the rotor.
- sealing grooves 26 are arranged, which receive strip seals for sealing the gaps between adjacent guide vanes.
- a slot 33 is disposed substantially parallel to the plane of the platform, which can be seen in Fig. 4 in more detail.
- the slot 33 has according to 5a shows a keyhole-like cross-sectional profile with a wall portion 33a (with parallel sides or walls) of the width b and a circular end portion 33b with the radius r placed at the bottom of the slot 33.
- the width b of the wall portion 33a is less than 1 mm, preferably about 0.4 mm, while the radius r of the end portion 33b is greater than 1 mm, preferably about 1, 25 mm.
- the aim in the dimensioning of the slot is to reduce the mechanical load on the trailing edge of the thermally bending blade head 23, without creating stress concentrations at the bottom of the slot 33 and large volumes in the slot, which result in additional thermal stresses when filled with cooling air could.
- the blade head has a quadrangular (in particular diamond-shaped) base area.
- the trailing edge 28 with the cooling slot 29 arranged in front of it opens at one of the four corners (bottom left in FIG. 5) in the blade head 23.
- the slot 33 intersects this corner with a depth which ensures a sufficient distance of the slot bottom to the trailing edge, wherein the end portion 33b of the slot 33 with the side walls of the inner platform 23 includes an acute angle w, in particular such between 30 ° and 40 °.
- Essential for the invention in the illustrated embodiment is a slot through the blade head 23, which changes the resulting due to thermal bending of the end-side part voltage flow and relieves the thin trailing edge of the blade with the pressure-side edge cooling.
- the baseline (end portion 33b) of the slot is not perpendicular to the trailing edge line of curvature, and makes an acute angle with the side surface of the blade head 23 to balance the stresses at both ends of the slot, at the side and rear sides thereof.
- the slot has the cross-sectional contour of a "keyhole" to reduce the stresses at the bottom of the slot and minimize the overall volume of the slot because a large cavity filled with cooling air would increase the temperature gradient and thus the stresses on the trailing edge.
- the invention can be used with all turbine vanes. It is preferably used in large stationary gas turbines with sequential combustion, such as the Applicant's GT24 / 26, in the third row of vanes of the low-pressure turbine.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH01845/08A CH699998A1 (de) | 2008-11-26 | 2008-11-26 | Leitschaufel für eine Gasturbine. |
PCT/EP2009/065210 WO2010060823A1 (de) | 2008-11-26 | 2009-11-16 | Leitschaufel für eine gasturbine und zugehörige gasturbine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2350441A1 true EP2350441A1 (de) | 2011-08-03 |
EP2350441B1 EP2350441B1 (de) | 2019-04-10 |
Family
ID=40677819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09755892.8A Active EP2350441B1 (de) | 2008-11-26 | 2009-11-16 | Leitschaufel für eine gasturbine und zugehörige gasturbine |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110286834A1 (de) |
EP (1) | EP2350441B1 (de) |
CH (1) | CH699998A1 (de) |
WO (1) | WO2010060823A1 (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH705838A1 (de) | 2011-12-05 | 2013-06-14 | Alstom Technology Ltd | Abgasgehäuse für eine Gasturbine sowie Gasturbine mit einem Abgasgehäuse. |
EP2781697A1 (de) * | 2013-03-20 | 2014-09-24 | Siemens Aktiengesellschaft | Turbomaschinenkomponente mit Entlastungshohlraum und Verfahren zum Gestalten solchem Hohlraum |
EP2853686A1 (de) * | 2013-09-27 | 2015-04-01 | Siemens Aktiengesellschaft | Turbinenschaufel, und zugehörige Herstellungsverfahren, Stator, Rotor, Turbine und Kraftwerksanlage |
EP2918784A1 (de) * | 2014-03-13 | 2015-09-16 | Siemens Aktiengesellschaft | Schaufelfuß für eine Turbinenschaufel |
FR3056630B1 (fr) * | 2016-09-26 | 2018-12-07 | Safran Aircraft Engines | Disque aubage monobloc de soufflante pour turbomachine d'aeronef |
US10815886B2 (en) | 2017-06-16 | 2020-10-27 | General Electric Company | High tip speed gas turbine engine |
US10711797B2 (en) * | 2017-06-16 | 2020-07-14 | General Electric Company | Inlet pre-swirl gas turbine engine |
US10724435B2 (en) | 2017-06-16 | 2020-07-28 | General Electric Co. | Inlet pre-swirl gas turbine engine |
US10794396B2 (en) | 2017-06-16 | 2020-10-06 | General Electric Company | Inlet pre-swirl gas turbine engine |
FR3070718B1 (fr) * | 2017-09-06 | 2019-08-23 | Safran Aircraft Engines | Ensemble de turbine a secteurs d'anneau |
US11428160B2 (en) | 2020-12-31 | 2022-08-30 | General Electric Company | Gas turbine engine with interdigitated turbine and gear assembly |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1190771A (en) * | 1966-04-13 | 1970-05-06 | English Electric Co Ltd | Improvements in or relating to Turbine and Compressor Blades |
GB1565361A (en) * | 1976-01-29 | 1980-04-16 | Rolls Royce | Blade or vane for a gas turbine engien |
US4236870A (en) * | 1977-12-27 | 1980-12-02 | United Technologies Corporation | Turbine blade |
US5358379A (en) * | 1993-10-27 | 1994-10-25 | Westinghouse Electric Corporation | Gas turbine vane |
JP2001152804A (ja) * | 1999-11-19 | 2001-06-05 | Mitsubishi Heavy Ind Ltd | ガスタービン設備及びタービン翼 |
CA2334071C (en) * | 2000-02-23 | 2005-05-24 | Mitsubishi Heavy Industries, Ltd. | Gas turbine moving blade |
US6435821B1 (en) * | 2000-12-20 | 2002-08-20 | United Technologies Corporation | Variable vane for use in turbo machines |
US6390775B1 (en) * | 2000-12-27 | 2002-05-21 | General Electric Company | Gas turbine blade with platform undercut |
US7121803B2 (en) * | 2002-12-26 | 2006-10-17 | General Electric Company | Compressor blade with dovetail slotted to reduce stress on the airfoil leading edge |
US6761536B1 (en) * | 2003-01-31 | 2004-07-13 | Power Systems Mfg, Llc | Turbine blade platform trailing edge undercut |
US7147440B2 (en) * | 2003-10-31 | 2006-12-12 | General Electric Company | Methods and apparatus for cooling gas turbine engine rotor assemblies |
US7600972B2 (en) * | 2003-10-31 | 2009-10-13 | General Electric Company | Methods and apparatus for cooling gas turbine engine rotor assemblies |
US6984112B2 (en) * | 2003-10-31 | 2006-01-10 | General Electric Company | Methods and apparatus for cooling gas turbine rotor blades |
US6951447B2 (en) * | 2003-12-17 | 2005-10-04 | United Technologies Corporation | Turbine blade with trailing edge platform undercut |
US7175386B2 (en) * | 2003-12-17 | 2007-02-13 | United Technologies Corporation | Airfoil with shaped trailing edge pedestals |
FR2874402B1 (fr) * | 2004-08-23 | 2006-09-29 | Snecma Moteurs Sa | Aube de rotor d'un compresseur ou d'une turbine a gaz |
-
2008
- 2008-11-26 CH CH01845/08A patent/CH699998A1/de not_active Application Discontinuation
-
2009
- 2009-11-16 EP EP09755892.8A patent/EP2350441B1/de active Active
- 2009-11-16 WO PCT/EP2009/065210 patent/WO2010060823A1/de active Application Filing
-
2011
- 2011-05-26 US US13/116,138 patent/US20110286834A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2010060823A1 * |
Also Published As
Publication number | Publication date |
---|---|
CH699998A1 (de) | 2010-05-31 |
US20110286834A1 (en) | 2011-11-24 |
EP2350441B1 (de) | 2019-04-10 |
WO2010060823A1 (de) | 2010-06-03 |
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