EP2350440A1 - Verfahren zur optimierung der kontaktflächen von aneinander anstossenden deckbandsegmenten benachbarter schaufeln einer gasturbine - Google Patents
Verfahren zur optimierung der kontaktflächen von aneinander anstossenden deckbandsegmenten benachbarter schaufeln einer gasturbineInfo
- Publication number
- EP2350440A1 EP2350440A1 EP09760513A EP09760513A EP2350440A1 EP 2350440 A1 EP2350440 A1 EP 2350440A1 EP 09760513 A EP09760513 A EP 09760513A EP 09760513 A EP09760513 A EP 09760513A EP 2350440 A1 EP2350440 A1 EP 2350440A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- shroud segments
- blades
- contact surfaces
- locking surfaces
- 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
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
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/18—Two-dimensional patterned
- F05D2250/183—Two-dimensional patterned zigzag
Definitions
- the present invention relates to the field of gas turbines. It relates to a method for optimizing the contact surfaces between the
- the blades of gas turbines are exposed in operation strong centrifugal forces, high temperatures and high pressures. This load causes the blades to deform, which can be composed of expansion, tilting and twisting.
- the change in the blade geometry can be significant, especially with long blades. In particular, it has an effect on blades which are each equipped with a shroud segment at the blade tip.
- the shroud segments of adjacent blades of a row of blades engage with each other or abut each other and form an annular shroud that surrounds the outside of the hot gas channel of the gas turbine and seals to the outside.
- the shroud segments should on the one hand connect as close to each other as possible, so that no hot gas from the hot gas channel can penetrate into the usually cooled cavity formed outside the shroud.
- it must be prevented that the shroud segments due to operational deformations of the blade at narrow contact surfaces build up large compressive stresses, which leads to a plastic deformation and / or flow of the blade material and / or to a welding of the blades can lead yourself.
- the life of the blades is significantly reduced or obstructed the removal of the blades for maintenance purposes.
- Shroud segment itself, but are compared with other deformations of the blade such. a twist around the longitudinal axis largely ineffective.
- the invention aims to remedy this situation. It is therefore an object of the invention to provide a method for producing a gas turbine blade, through which the contact surfaces between the locking surfaces of the adjoining shroud segments of adjacent blades of a
- Blade row can be optimized so that tightly limited contact surfaces with high compressive stresses safely avoided without giving up the necessary tightness between the adjacent shroud segments.
- Essential for the method according to the invention are the following steps: a) Providing a 3D model of the individual blade (10, 10 '); b) a calculation of the geometry of the individual blade (10, 10 ') on the basis of the provided 3D model taking into account the centrifugal forces, temperature loads, pressure loads, the blade occurring during operation; c) An optimized embodiment of the contact surfaces of the adjoining shroud segments (14) of adjacent blades (10, 10 ') in the loaded state of the operating blades (10, 10') with respect to functionally serving locking surfaces (F2, F2 ') and on both sides of the locking surfaces arranged functionally serving wedge surfaces (F 1, FV, F3, F3') and d) Determining the necessary geometry of the
- the calculation based on b) may also be dependent on additional parameters with respect to the parameters focussed here, for example on the particular material used for the blade, on the particular production method of the blade, on the respective further finishing processes to which the blade is subjected , In such cases, the corresponding parameters for calculating the geometry are included.
- the invention is based on the recognition that it is not sufficient to equip the shroud segments in the unloaded state with mutually parallel locking surfaces in order to obtain a large-area contact between the adjacent shroud segments in the loaded state. Rather, the deformation of the blade due to the operational stresses must be included in the design of the (unloaded) blade, that only with the deformation of an approximate parallelization of the locking surfaces is achieved, the same time a sufficient tightness and a large distribution of any compressive stresses between the segments guaranteed.
- the deformation behavior of the respective blade is calculated on the basis of a 3D model of the blade, so that it can be predicted mathematically, which configuration (geometry) of the shroud segments in the unloaded condition of the blade to the desired configuration (geometry) of the shroud segments in the loaded state Shovel leads. If this (optimized) output configuration (with possibly non-parallel locking surfaces) is determined from the model calculation, it can be used in the model calculation Manufacture of the blade, eg in the formation of the mold, are taken into account.
- the current shape of the locking surfaces depends significantly on the deformation behavior of the respective blade, which is among other things determined by the wall thicknesses, the blade length, the shape of the airfoil and the location of the respective blade in conjunction with the adjacent blades.
- the contact surfaces between the locking surfaces of the adjoining shroud segments of adjacent blades in the loaded state of the blade are optimized in such a way that an increase in the contact pressure is avoided by heating the blade to operating temperature.
- FIG. 1 is a side view of a (long) blade of a gas turbine with shroud segment on the blade tip, as to
- Fig. 2 in plan view from above in the direction of the blade longitudinal axis two adjacent blades of the type shown in Fig. 1 with the interlocking locking surfaces of their shroud segments;
- Shroud segments according to an embodiment of the invention.
- a (relatively long) blade is shown in a side view, as it is suitable for the application of the invention.
- the blade 10 extends in its longitudinal direction (radial direction within the gas turbine) along a longitudinal axis 15 and comprises a blade root 11 for attachment of the blade to the rotor, a platform 12, which forms the inner boundary of the hot gas channel, an airfoil 13 and an on the Vane tip arranged shroud segment 14.
- the shroud segment 14 In the plan view in the radial direction (in the direction of the longitudinal axis 15) has the shroud segment 14, for example, the edge contour shown in Fig. 2.
- the shroud segment 14 of FIG. 2 In the circumferential direction (y-direction in Fig. 2), the shroud segment 14 of FIG. 2 by zigzag arranged wedge surfaces F1 and F3 or FV and F3 ', and interposed locking surfaces F2 and F2' limited. If two adjacent blades 10 and 10 'in the direction of the arrows in Fig. 2 (y-direction) resp.
- the two shroud segments 14 mesh with the locking surfaces F2 and F2 ', the opposing wedge surfaces F1, FV and F3, F3' disposed on both sides of the locking surfaces F2, F2 'providing a stabilizing guiding function take.
- the locking surfaces F2, F2 'in the manufacture of the blades 10, 10' were previously aligned in pairs parallel to each other. If the blades 10, 10 'then twist in use, for example, about the longitudinal axis 15 in the direction of the rotary arrows shown in FIG.
- the locking surfaces F2, F2' are no longer in pairs in parallel, but strongly localized contact areas with high compressive stresses occur the shroud segments 14 abut each other, this can sometimes also lead to plastic deformation in operation, which also does not exclude that then comes to local welds.
- the blade is now described by a 3D model which allows a calculation of the geometry changed under load (steps A and B in FIG. 4).
- the connection surfaces can now be chosen such that the undesired strongly localized contact areas between the adjacent shroud segments are avoided without impairing the tightness between the shroud segments too much (step C in FIG. 4). If the shroud segments 14 are configured accordingly in the loaded state, it is possible to deduce the corresponding configuration in the unloaded state on the basis of the 3D model (step D in FIG. 4). This corresponding configuration is then used to manufacture the blade 10 or 10 '.
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 |
|---|---|---|---|
| CH01854/08A CH699984A1 (de) | 2008-11-27 | 2008-11-27 | Verfahren zur Optimierung der Kontaktflächen von aneinander anstossenden Deckbandsegmenten benachbarter Schaufeln einer Gasturbine. |
| PCT/EP2009/065543 WO2010060867A1 (de) | 2008-11-27 | 2009-11-20 | Verfahren zur optimierung der kontaktflächen von aneinander anstossenden deckbandsegmenten benachbarter schaufeln einer gasturbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2350440A1 true EP2350440A1 (de) | 2011-08-03 |
| EP2350440B1 EP2350440B1 (de) | 2012-12-19 |
Family
ID=40691093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09760513A Active EP2350440B1 (de) | 2008-11-27 | 2009-11-20 | Verfahren zur optimierung der kontaktflächen von aneinander anstossenden deckbandsegmenten benachbarter schaufeln einer gasturbine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20110293428A1 (de) |
| EP (1) | EP2350440B1 (de) |
| CH (1) | CH699984A1 (de) |
| WO (1) | WO2010060867A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201508763D0 (en) | 2015-05-22 | 2015-07-01 | Rolls Royce Plc | Rotary blade manufacturing method |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3034417B2 (ja) * | 1994-02-18 | 2000-04-17 | 株式会社東芝 | 軸流タービンの動翼制振装置 |
| US6223524B1 (en) * | 1998-01-23 | 2001-05-01 | Diversitech, Inc. | Shrouds for gas turbine engines and methods for making the same |
| US6393331B1 (en) * | 1998-12-16 | 2002-05-21 | United Technologies Corporation | Method of designing a turbine blade outer air seal |
| US6241471B1 (en) * | 1999-08-26 | 2001-06-05 | General Electric Co. | Turbine bucket tip shroud reinforcement |
| DE10047307A1 (de) * | 2000-09-25 | 2002-08-01 | Alstom Switzerland Ltd | Dichtungsanordnung |
| DE50211431D1 (de) * | 2001-09-25 | 2008-02-07 | Alstom Technology Ltd | Dichtungsanordnung zur dichtspaltreduzierung innerhalb einer strömungsrotationsmaschine |
| US7206709B2 (en) * | 2003-05-29 | 2007-04-17 | Carnegie Mellon University | Determination of damping in bladed disk systems using the fundamental mistuning model |
| DE10328310A1 (de) * | 2003-06-23 | 2005-01-13 | Alstom Technology Ltd | Verfahren zum Modifizieren der Kopplungsgeometrie bei Deckbandsegmenten von Turbinenlaufschaufeln |
| US7001152B2 (en) * | 2003-10-09 | 2006-02-21 | Pratt & Wiley Canada Corp. | Shrouded turbine blades with locally increased contact faces |
| CH698087B1 (de) * | 2004-09-08 | 2009-05-15 | Alstom Technology Ltd | Schaufel mit Deckbandelement. |
| EP1881155A1 (de) * | 2006-07-21 | 2008-01-23 | Ansaldo Energia S.P.A. | Vorrichtung für den Entwurf von Turbinen und Turbinenschaufeln |
| US7686568B2 (en) * | 2006-09-22 | 2010-03-30 | General Electric Company | Methods and apparatus for fabricating turbine engines |
| EP1970535A1 (de) * | 2007-03-15 | 2008-09-17 | ABB Turbo Systems AG | Deckbandverbindung einer Turbinenschaufel |
-
2008
- 2008-11-27 CH CH01854/08A patent/CH699984A1/de not_active Application Discontinuation
-
2009
- 2009-11-20 WO PCT/EP2009/065543 patent/WO2010060867A1/de not_active Ceased
- 2009-11-20 EP EP09760513A patent/EP2350440B1/de active Active
-
2011
- 2011-05-27 US US13/117,166 patent/US20110293428A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010060867A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2350440B1 (de) | 2012-12-19 |
| CH699984A1 (de) | 2010-05-31 |
| US20110293428A1 (en) | 2011-12-01 |
| WO2010060867A1 (de) | 2010-06-03 |
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