EP1747349A1 - STRÖMUNGSMASCHINENSCHAUFEL MIT EINEM DECKBAND UND GEWICHTSOéTIMIERTER DICHTLEISTE - Google Patents
STRÖMUNGSMASCHINENSCHAUFEL MIT EINEM DECKBAND UND GEWICHTSOéTIMIERTER DICHTLEISTEInfo
- Publication number
- EP1747349A1 EP1747349A1 EP05747436A EP05747436A EP1747349A1 EP 1747349 A1 EP1747349 A1 EP 1747349A1 EP 05747436 A EP05747436 A EP 05747436A EP 05747436 A EP05747436 A EP 05747436A EP 1747349 A1 EP1747349 A1 EP 1747349A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing strip
- thickness
- blade
- circumferential direction
- airfoil
- 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
- 238000007789 sealing Methods 0.000 title claims abstract description 54
- 238000009434 installation Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 238000003754 machining Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 13
- 230000007704 transition Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005245 sintering Methods 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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/22—Blade-to-blade connections, e.g. for damping vibrations
- F01D5/225—Blade-to-blade connections, e.g. for damping vibrations by shrouding
-
- 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
- F05D2230/00—Manufacture
- F05D2230/10—Manufacture by removing material
-
- 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
- F05D2240/11—Shroud seal segments
Definitions
- the invention relates to a turbomachine blade according to the preamble of claim 1. It also relates to a method for producing a turbomachine blade according to the invention.
- Blade shrouds are used on the one hand to mechanically couple the blade tip areas of adjacent blades with one another, which results in greater stiffness of the blade composite and thus a higher natural vibration frequency.
- sealing tapes in turbomachine blades are also used to reduce leakage at the blade tips.
- the cover tapes preferably also carry sealing strips which interact with a counter-running surface and form a non-contact seal, for example a labyrinth seal.
- the counterface is often a so-called honeycomb structure (“honeycomb”) or another system that is tolerant of abrasion.
- the circumferential blade shrouds usually consist of individual segments, which are each cast at the tip of a blade.
- the arrangement of a shroud element results in an increased load on the blade root and the blade due to the centrifugal forces of the shroud element.
- the shroud elements are generally not centrally located on the tip of the airfoil. This additionally results in a bending load for the airfoil and a “tilting”, that is to say lifting on one side, of the shroud element. It has furthermore been shown that, even in the case of balanced cover band elements, plastic deformations and thus "tilting" can occur due to the centrifugal force during operation.
- a turbomachine blade of the type mentioned in the introduction is to be specified in such a way that the asymmetrical loads caused by the centrifugal force load on the shroud element, which can result in a shroud element being raised, are reduced and / or avoided.
- the shroud element which is arranged with respect to the skeleton line of the airfoil, in particular circumferentially asymmetrically at the head end of the airfoil, in such a way that the thickness of the sealing strip varies in the circumferential direction.
- the thickness of the sealing strip in the areas lying outside in the installation circumferential direction has a lower value than in the central area, which lies in the area of the airfoil.
- the plastic deformation under centrifugal force is reduced or completely prevented.
- the reduced mass of the shroud element reduces the total centrifugal load on the blade root; on the other hand, the reduced moment of inertia of the shroud element with respect to the airfoil skeleton line reduces the bending moment initiated under centrifugal force due to the asymmetry of the shroud element at the transition from the shroud element to the airfoil.
- a one-sided lifting or "tilting" of the shroud element is thereby reduced.
- the thickness of the sealing strip is varied such that the mass moment of inertia of the shroud element is balanced with respect to the blade skeleton line.
- the absolute reduction in the moment of inertia which turns out to be particularly large when the mass reduction is carried out in one embodiment of the invention in the regions lying outside in the circumferential direction, furthermore results in an absolute reduction or a total avoidance of local plastic deformations at the transition to the airfoil.
- the invention can be very easily applied to existing ones
- Turbomachine blades can be realized by post-machining the sealing strip, for example by milling, grinding or eroding.
- the invention can thus be implemented in existing turbomachines without having to redesign the tools for producing the turbomachine blades. Furthermore, it is also possible to rework blades already in use as part of maintenance work according to the invention.
- an upstream sealing strip is arranged on the shroud element, which is adjacent to the leading edge of the airfoil, and a sealing strip on the downstream side, which is arranged adjacent to the trailing edge of the airfoil.
- the thickness of the upstream sealing strip preferably varies.
- the sealing strip has a greater thickness in the area of the airfoil than in the positions lying on the outside in the circumferential direction of the installation.
- the area of reduced thickness of the sealing strip is, for example, 20% to 70% of the extent of the sealing strip in the circumferential installation direction.
- turbomachine blade this can be produced with a sealing strip with a thickness that varies in the circumferential direction on the one hand already during primary shaping, that is to say, for example, during casting. With the completely new construction of a turbomachine blade, this path is easily feasible.
- Another possibility for producing a turbomachine blade according to the invention is to process an existing turbomachine blade and to reduce the thickness of the sealing strip in the regions lying on the outside in the circumferential direction. This reduction is achieved, for example, by machining, the mass of the sealing strip preferably being reduced by 10% to 50% of the original mass by the machining. The mass reduction also helps to reduce the centrifugal load on the blade root.
- the post-processing of an existing blade makes it possible to implement the invention, particularly in the case of already existing designs. Furthermore, blades that are already in use can be modified as part of tumultuous maintenance work according to the invention.
- FIG. 1 shows blades of a turbomachine
- Figure 2 shows a single turbomachine blade according to the prior art
- Figure 3 shows a single turbomachine blade according to the prior art in a plan view
- FIG. 4 shows a turbomachine blade according to the invention
- FIG. 5 shows a turbomachine blade according to the invention in a top view. Details not necessary for understanding the invention have been omitted.
- the exemplary embodiments serve for a better understanding of the invention and should not be used to restrict the invention characterized in the claims.
- FIG. 1 A section of the blading of a turbine according to the prior art is shown in FIG.
- the head regions of two adjacent blades 1 are shown.
- Each of the rotor blades 1 comprises a blade root, not shown, but which is readily familiar to the person skilled in the art, which comprises a fastening device with which the rotor blade is fastened in the rotor of a gas turbine group or steam turbine.
- Each of the blades has an installation circumferential direction, which is represented by the rotational rotational speed U, and an installation radial direction, which points from the blade root to the blade head.
- a moving blade comprises an airfoil 11 with an airfoil leading edge 12 and an airfoil trailing edge 13.
- a flow of hot gas flows through the airfoil grille formed by the blades from the airfoil leading edge to the airfoil trailing edge.
- the blade blading shown has a so-called blade shroud, which the blade row as Ring surrounds.
- the arrangement of the cover band reduces leakage at the blade tips.
- the cover band mechanically couples the blades to the blade tips, such that the vibration mode of the blades is the vibration mode of a packet vibration in which a plurality of blades vibrate in phase. This results in a greater rigidity of the blading and in a significantly higher natural vibration frequency compared to the vibrations of a single blade.
- the shroud is formed by shroud elements 14 which are arranged on the head of each blade. Radial sealing strips running in the circumferential direction, specifically an inflow-side sealing strip 15 and an outflow-side sealing strip 16, are arranged on the shroud elements 14. In a manner known per se, the sealing strips form a contactless labyrinth seal with the housing parts opposite them in the installed state.
- the shroud elements are, so to speak, stored on the blades 11. In the desired installation position, the circumferential end faces of the shroud elements of two adjacent blades lie against one another and form an essentially gas-tight unit such that no hot gas can flow outwards from the throughflow channels of the blade grille.
- the blades shown move in the direction of the arrow labeled U.
- the blades, and in particular the shroud elements are loaded by centrifugal forces acting radially outwards, ie in the direction of the blade head.
- the centrifugal forces that act on the shroud elements must be absorbed in the blades. Due to the complex states of tension influenced by centrifugal forces and thermal deformations, local plastic deformations occur at the transition from the shroud element to the airfoil under unfavorable circumstances.
- the shroud element is moved radially outward by the dimension ⁇ .
- FIG. 2 shows a perspective view of the blade head area of the blade 1;
- Figure 3 shows a top view of the blade.
- the turbomachine blade has an installation radial direction R and an installation circumferential direction U.
- the airfoil skeleton line is designated 17.
- the airfoil skeleton line can be viewed as a virtual axis of the tilting movement shown above.
- On the suction side of the blade and on the pressure side of the blade the moments of inertia of the shroud element are different with respect to this virtual axis.
- the centrifugal force loading of the shroud element during operation of the turbomachine results in a first bending moment 4 and a second bending moment 6.
- These bending moments are not balanced, in particular in the area of the leading edge 12 of the airfoil or the sealing strip 15 on the inflow side, in such a way that the described raising of the covering band element on the pressure side of the blade occurs comes.
- the thickness of the inflow-side sealing strip in regions 21 and 22 lying in the circumferential direction U is reduced compared to a central region. This reduces the mass moment of inertia of the shroud element. This means that the bending moments caused by the centrifugal force during operation and thus the deformation are reduced. Ideally, the reduction is carried out in such a way that, at least in the area on the inflow side, the shroud element is balanced with respect to the blade skeleton line.
- the areas 21 and 22 of reduced thickness of the sealing strip extended over 20% to 70% of the extent of the sealing strip in the circumferential direction, that is to say the sum L1 + L2 is between 20% and 70% of the total extent L. Because of the reduction in the mass of the shroud element the plastic deformation at the transition to the airfoil is at least reduced.
- Such a geometry of the sealing strip 15 can, on the one hand, be produced directly during the primary shaping, for example when casting or sintering the turbomachine blade.
- the turbomachine blade according to the invention is produced from a turbomachine blade with a constant thickness of the sealing strip, as shown in FIGS. 2 and 3, by cutting the sealing strip 15, that means, for example, by milling, grinding or eroding. So much material is removed in the areas labeled 21 and 22 that the mass of the sealing strip is reduced by 10% to 50% of the original mass. Care must be taken to ensure that the stiffness and strength of the sealing strip are retained.
- This manufacturing process proves to be particularly efficient when the blades of existing machines are to be modified in accordance with the invention. It is then not necessary to produce new tools for the manufacture of the blade, but only an additional machining step is necessary.
- This method is also particularly suitable for reworking blades that are already in use during overhaul and / or maintenance measures according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Auxiliary Methods And Devices For Loading And Unloading (AREA)
- Sealing Devices (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004025321A DE102004025321A1 (de) | 2004-05-19 | 2004-05-19 | Strömungsmaschinenschaufel |
PCT/EP2005/052198 WO2005113941A1 (de) | 2004-05-19 | 2005-05-13 | STRÖMUNGSMASCHINENSCHAUFEL MIT EINEM DECKBAND UND GEWICHTSOéTIMIERTER DICHTLEISTE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1747349A1 true EP1747349A1 (de) | 2007-01-31 |
EP1747349B1 EP1747349B1 (de) | 2008-11-12 |
Family
ID=34969025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05747436A Not-in-force EP1747349B1 (de) | 2004-05-19 | 2005-05-13 | Strömungsmaschinenschaufel mit einem deckband und gewichtsoptimierter dichtleiste |
Country Status (5)
Country | Link |
---|---|
US (1) | US7326033B2 (de) |
EP (1) | EP1747349B1 (de) |
AT (1) | ATE414214T1 (de) |
DE (2) | DE102004025321A1 (de) |
WO (1) | WO2005113941A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3077093A1 (fr) * | 2018-01-19 | 2019-07-26 | Safran Aircraft Engines | Aube equilibree d'une roue mobile d'une turbomachine |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060280610A1 (en) * | 2005-06-13 | 2006-12-14 | Heyward John P | Turbine blade and method of fabricating same |
EP1840333A1 (de) | 2006-03-31 | 2007-10-03 | ALSTOM Technology Ltd | Turbinenschaufel mit Deckbandteile |
US20090097979A1 (en) * | 2007-07-31 | 2009-04-16 | Omer Duane Erdmann | Rotor blade |
US8257035B2 (en) * | 2007-12-05 | 2012-09-04 | Siemens Energy, Inc. | Turbine vane for a gas turbine engine |
DE102008008894A1 (de) * | 2008-02-13 | 2009-08-20 | Man Turbo Ag | Verfahren zur Herstellung eines Bauteiles für eine thermische Maschine |
DE102008061800A1 (de) * | 2008-12-11 | 2010-06-17 | Rolls-Royce Deutschland Ltd & Co Kg | Segmentierte Dichtlippen für Labyrinthdichtungsringe |
TWI510189B (zh) * | 2009-06-19 | 2015-12-01 | Lilly Co Eli | 殺外寄生蟲之方法及調配物 |
US20120195742A1 (en) * | 2011-01-28 | 2012-08-02 | Jain Sanjeev Kumar | Turbine bucket for use in gas turbine engines and methods for fabricating the same |
DE102013224199A1 (de) * | 2013-11-27 | 2015-05-28 | MTU Aero Engines AG | Gasturbinen-Laufschaufel |
CN113486512B (zh) * | 2021-07-05 | 2022-05-10 | 哈尔滨工程大学 | 一种功能梯度变厚度叶片模型的颤振分析方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2278041A (en) * | 1939-10-23 | 1942-03-31 | Allis Chalmers Mfg Co | Turbine blade shroud |
US4878810A (en) * | 1988-05-20 | 1989-11-07 | Westinghouse Electric Corp. | Turbine blades having alternating resonant frequencies |
US5048183A (en) * | 1988-08-26 | 1991-09-17 | Solar Turbines Incorporated | Method of making and repairing turbine blades |
US5083903A (en) * | 1990-07-31 | 1992-01-28 | General Electric Company | Shroud insert for turbomachinery blade |
EP0528138B1 (de) * | 1991-08-08 | 1995-05-17 | Asea Brown Boveri Ag | Deckblatt für axialdurchströmte Turbine |
EP0536575B1 (de) | 1991-10-08 | 1995-04-05 | Asea Brown Boveri Ag | Deckband für axialdurchströmte Turbine |
DE19904229A1 (de) * | 1999-02-03 | 2000-08-10 | Asea Brown Boveri | Gekühlte Turbinenschaufel |
JP2001055902A (ja) * | 1999-08-18 | 2001-02-27 | Toshiba Corp | タービン動翼 |
FR2825411B1 (fr) * | 2001-05-31 | 2003-09-19 | Snecma Moteurs | Aube de turbine avec lechette d'etancheite |
DE50304325D1 (de) * | 2002-04-16 | 2006-09-07 | Alstom Technology Ltd | Laufschaufel für eine Turbomaschine |
-
2004
- 2004-05-19 DE DE102004025321A patent/DE102004025321A1/de not_active Withdrawn
-
2005
- 2005-05-13 AT AT05747436T patent/ATE414214T1/de not_active IP Right Cessation
- 2005-05-13 WO PCT/EP2005/052198 patent/WO2005113941A1/de not_active Application Discontinuation
- 2005-05-13 DE DE502005005956T patent/DE502005005956D1/de active Active
- 2005-05-13 EP EP05747436A patent/EP1747349B1/de not_active Not-in-force
-
2006
- 2006-11-17 US US11/600,754 patent/US7326033B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2005113941A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3077093A1 (fr) * | 2018-01-19 | 2019-07-26 | Safran Aircraft Engines | Aube equilibree d'une roue mobile d'une turbomachine |
Also Published As
Publication number | Publication date |
---|---|
US7326033B2 (en) | 2008-02-05 |
DE102004025321A1 (de) | 2005-12-08 |
US20070104570A1 (en) | 2007-05-10 |
WO2005113941A1 (de) | 2005-12-01 |
DE502005005956D1 (de) | 2008-12-24 |
ATE414214T1 (de) | 2008-11-15 |
EP1747349B1 (de) | 2008-11-12 |
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