EP2331790A1 - Schaufel für eine gasturbine - Google Patents
Schaufel für eine gasturbineInfo
- Publication number
- EP2331790A1 EP2331790A1 EP09783149A EP09783149A EP2331790A1 EP 2331790 A1 EP2331790 A1 EP 2331790A1 EP 09783149 A EP09783149 A EP 09783149A EP 09783149 A EP09783149 A EP 09783149A EP 2331790 A1 EP2331790 A1 EP 2331790A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winglet
- cooling
- blade
- vane
- 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
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
- F01D5/18—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
- F01D5/12—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
Definitions
- the present invention relates to the field of gas turbines. It relates to a blade for a gas turbine according to the preamble of claim 1.
- the rotor blades of gas turbines which are exposed to the hot gas flow in the turbine are often equipped at the blade tip with a shroud segment which forms, together with the shroud segments of the other blades of a blade row concentric with the rotor axis, annular shroud.
- a shroud segment which forms, together with the shroud segments of the other blades of a blade row concentric with the rotor axis, annular shroud.
- the shroud on the one hand, the blade row is mechanically stabilized.
- the secondary flow of the hot gas is reduced via the blade tip and thus increases the aerodynamic efficiency.
- Such shroud segments and methods and devices for their cooling are well known in the art (see for example EP-A2-1 041 247 or EP-A1-1 591 626 or GB-A-2 434 842).
- a blade is shown in fragmentary form in Fig. 1.
- the blade 10 of Fig. 1 comprises in one Blade longitudinal direction (corresponding to the radial direction on the rotor) extending airfoil 1 1 with a front edge 13 and a trailing edge 12.
- the blade 1 1 ends in a blade tip 14 and passes at the blade tip 14 in a shroud segment 16.
- the bottom of the shroud segment 16 is extended forwardly (upstream), forming a winglet 19 located in the region of the leading edge 13 of the airfoil 11, which is bounded to the front by a slightly rounded front edge 24 ,
- the winglet 19 is provided to prevent hot gas from penetrating directly above the first rib 18 into the cavity formed between the two ribs 17 and 18 above the shroud. Since the winglet 19 projects directly into the hot gas stream 21, it is exposed to high temperatures. As a result, the material properties deteriorate and (due to the mismatch in the metal temperatures between the uncooled winglet 19 and the cooled main volume of the shroud segment 16) there are high thermal stresses on the winglet 19.
- the invention aims to remedy this situation. It is therefore an object of the invention to provide a blade equipped with a winglet for a gas turbine, which avoids the disadvantages of known solutions and is characterized in particular by an effective, highly efficient and efficiency as little as possible impairing cooling of the winglet.
- the object is solved by the entirety of the features of claim 1.
- Essential for the invention is that means for direct cooling of the winglet are provided. As a result, the thermal stresses in the region of the front edge of the blade on the shroud segment can be reduced without excessively large amount of cooling fluid having to be blown out into the hot gas flow.
- the means for directly cooling the winglet comprise a plurality of cooling bores running in the interior of the winglet. Through the cooling hole targeted cooling of all important areas of the winglet is possible at the same time intensive contact between the cooling medium and the winglet and minimal use of cooling medium.
- the winglet has a leading edge facing the hot gas flow, and the cooling holes are led to the leading edge of the winglet.
- cooling holes are arranged obliquely to the flow direction of the hot gas flow, in particular, the cooling holes are guided past on both sides of the leading edge of the airfoil. As a result, the thermal gradients are reduced, and the holes do not end near or directly at the front edge, which is mechanically stressed.
- the cooling bores are in this case for supply with a cooling medium, in particular cooling air, preferably in conjunction with the interior of the airfoil.
- Fig. 1 in a perspective side view of the upper part of a gas turbine blade shown schematically with shroud segment and mounted on the shroud segment winglet, as is the subject of the invention and
- FIG. 2 is a plan view from above of the arrangement of the cooling holes in the winglet in a blade of the type shown in Fig. 1 according to an embodiment of the invention.
- cooling bores 22, 23 are laid through which a cooling medium, in particular cooling air, flows and the winglet 19 is efficient cools inside out.
- the obliquely arranged cooling bores 22, 23 are preferably supplied via a arranged below the first rib 18 cooling duct 25 with cooling medium, which is brought over the hollow interior 15 of the airfoil 1 1.
- the holes can be subsequently changed - if necessary - in their arrangement, whereby an increased flexibility is achieved.
- the arrangement of the cooling bores 22, 23 directly in the winglet 19 has a notch effect in a heavily stressed area, so that there is a risk of cracking at the bores.
- this risk is mitigated by the fact that the cooling holes 22, 23 are arranged obliquely.
- the cooling holes reduce the temperature in the winglet 19 and thus improve the situation with respect to "low cycle fatigue", creep and oxidation in the winglet
- the advantage of the oblique arrangement of the cooling bores instead of a straight arrangement in the winglet 19 is on the one hand that the thermal
- the cooling holes 22, 23 do not open directly at the front edge 13 of the blade 20, but on both sides into the outer space, a negative influence on the mechanically heavily loaded area of the front edge 13 is avoided.
- the cooling bores 22, 23 are guided obliquely past the front edge 13 of the airfoil 1 1 on both sides to the front edge 24 of the winglet 19.
- the direct cooling of the winglet outside the immediate area of the blade leading edge 13 significantly improves the service life of the blade 20.
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 |
|---|---|---|---|
| CH01519/08A CH699593A1 (de) | 2008-09-25 | 2008-09-25 | Schaufel für eine gasturbine. |
| PCT/EP2009/062090 WO2010034669A1 (de) | 2008-09-25 | 2009-09-18 | Schaufel für eine gasturbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2331790A1 true EP2331790A1 (de) | 2011-06-15 |
| EP2331790B1 EP2331790B1 (de) | 2012-08-15 |
Family
ID=40120136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09783149A Not-in-force EP2331790B1 (de) | 2008-09-25 | 2009-09-18 | Schaufel für eine gasturbine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8764395B2 (de) |
| EP (1) | EP2331790B1 (de) |
| CH (1) | CH699593A1 (de) |
| ES (1) | ES2393454T3 (de) |
| WO (1) | WO2010034669A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5868609B2 (ja) * | 2011-04-18 | 2016-02-24 | 三菱重工業株式会社 | ガスタービン動翼及びその製造方法 |
| BR102013021427B1 (pt) * | 2013-08-16 | 2022-04-05 | Luis Antonio Waack Bambace | Turbomáquinas axiais de carcaça rotativa e elemento central fixo |
| US20160194969A1 (en) * | 2013-10-03 | 2016-07-07 | United Technologies Corporation | Turbine Vane With Platform Rib |
| US10641174B2 (en) | 2017-01-18 | 2020-05-05 | General Electric Company | Rotor shaft cooling |
| US10301943B2 (en) * | 2017-06-30 | 2019-05-28 | General Electric Company | Turbomachine rotor blade |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB791751A (en) * | 1954-01-06 | 1958-03-12 | Bristol Aero Engines Ltd | Improvements in or relating to blades for axial flow gas turbine engines, and to methods of making such blades |
| US4576008A (en) | 1984-01-11 | 1986-03-18 | Westinghouse Electric Corp. | Turbine protection system for bypass operation |
| GB9224241D0 (en) * | 1992-11-19 | 1993-01-06 | Bmw Rolls Royce Gmbh | A turbine blade arrangement |
| US5482435A (en) * | 1994-10-26 | 1996-01-09 | Westinghouse Electric Corporation | Gas turbine blade having a cooled shroud |
| GB2298246B (en) * | 1995-02-23 | 1998-10-28 | Bmw Rolls Royce Gmbh | A turbine-blade arrangement comprising a shroud band |
| US6019572A (en) * | 1998-08-06 | 2000-02-01 | Siemens Westinghouse Power Corporation | Gas turbine row #1 steam cooled vane |
| EP1041247B1 (de) | 1999-04-01 | 2012-08-01 | General Electric Company | Gasturbinenschaufel mit einem offenen Kühlkreislauf |
| GB9915648D0 (en) * | 1999-07-06 | 1999-09-01 | Rolls Royce Plc | Improvement in or relating to turbine blades |
| US6471480B1 (en) * | 2001-04-16 | 2002-10-29 | United Technologies Corporation | Thin walled cooled hollow tip shroud |
| DE10227709B4 (de) | 2001-06-25 | 2011-07-21 | Alstom Technology Ltd. | Dampfturbinenanlage sowie Verfahren zu deren Betrieb |
| EP1591626A1 (de) | 2004-04-30 | 2005-11-02 | Alstom Technology Ltd | Schaufel für Gasturbine |
| GB2434842A (en) * | 2006-02-02 | 2007-08-08 | Rolls Royce Plc | Cooling arrangement for a turbine blade shroud |
| DE102008029941B4 (de) | 2007-10-16 | 2009-11-19 | E.On Kraftwerke Gmbh | Dampfkraftanlage und Verfahren zur Regelung der Leistung einer Dampfkraftanlage |
| GB2453849B (en) | 2007-10-16 | 2010-03-31 | E On Kraftwerke Gmbh | Steam power plant and method for controlling the output of a steam power plant using an additional bypass pipe |
-
2008
- 2008-09-25 CH CH01519/08A patent/CH699593A1/de not_active Application Discontinuation
-
2009
- 2009-09-18 WO PCT/EP2009/062090 patent/WO2010034669A1/de not_active Ceased
- 2009-09-18 EP EP09783149A patent/EP2331790B1/de not_active Not-in-force
- 2009-09-18 ES ES09783149T patent/ES2393454T3/es active Active
-
2011
- 2011-03-24 US US13/071,219 patent/US8764395B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010034669A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2393454T3 (es) | 2012-12-21 |
| WO2010034669A1 (de) | 2010-04-01 |
| CH699593A1 (de) | 2010-03-31 |
| EP2331790B1 (de) | 2012-08-15 |
| US20110223036A1 (en) | 2011-09-15 |
| US8764395B2 (en) | 2014-07-01 |
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