EP2439376A1 - Aube de rotor carénée pour une turbine à vapeur - Google Patents

Aube de rotor carénée pour une turbine à vapeur Download PDF

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Publication number
EP2439376A1
EP2439376A1 EP10186573A EP10186573A EP2439376A1 EP 2439376 A1 EP2439376 A1 EP 2439376A1 EP 10186573 A EP10186573 A EP 10186573A EP 10186573 A EP10186573 A EP 10186573A EP 2439376 A1 EP2439376 A1 EP 2439376A1
Authority
EP
European Patent Office
Prior art keywords
blade
shield plate
steam turbine
leading edge
plate
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.)
Withdrawn
Application number
EP10186573A
Other languages
German (de)
English (en)
Inventor
Frank Deister
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP10186573A priority Critical patent/EP2439376A1/fr
Priority to PCT/EP2011/067366 priority patent/WO2012045765A1/fr
Priority to EP11766987.9A priority patent/EP2609292A1/fr
Priority to CN201180048491.1A priority patent/CN103154436B/zh
Publication of EP2439376A1 publication Critical patent/EP2439376A1/fr
Withdrawn legal-status Critical Current

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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
    • F01D5/12—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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • 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
    • F01D5/141—Shape, i.e. outer, aerodynamic form
    • F01D5/142—Shape, i.e. outer, aerodynamic form of the blades of successive rotor or stator blade-rows
    • F01D5/143—Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
    • 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
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/288—Protective coatings for 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
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/31—Application in turbines in steam turbines

Definitions

  • the invention relates to a blade with a cover plate for a steam turbine.
  • the blades of a low-pressure turbine final stage are formed in their radial extension and thus must withstand the stresses of high circumferential velocity at the blade tips of the blades and increased heating due to increased fan effects in the final stage.
  • the material titanium can be used, which is characterized in addition to a high corrosion resistance by a high strength and a low specific weight.
  • a cover band is provided for last run rows.
  • the invention has for its object to provide a blade for a steam turbine, in which the above problems are largely overcome and the blade is protected against droplet erosion.
  • the rotor blade according to the invention for a steam turbine has an airfoil, which has a blade leading edge and a blade tip, and a cover plate.
  • the top plate has a base plate attached to the blade tip of the airfoil and substantially parallel to the engine axis of the steam turbine in the installed state, and a shield plate formed upstream of and protruding radially inward from the blade leading edge to the base plate, so that the Blade tip lies with its portion of the blade leading edge in the lee of the shield plate, when the blade has flowed from a main steam flow of the steam turbine.
  • the arranged in the lee of the shield plate region of the blade is thus protected from a caused by the main steam flow drop impact erosion.
  • a particularly loaded transition region from the blade tip to the base plate is protected against the drop impact erosion, whereby costly structural measures to reinforce this transitional area need not be made.
  • the shield plate is preferably arranged at an axial distance from the vane leading edge of the same, whereby the axial extent of the base plate and thus the axial sealing width of the cover plate are large. A steam leakage occurring during operation of the associated steam turbine on the blade is thereby minimized, whereby the efficiency of the steam turbine is improved.
  • the shield plate is preferably formed in its radial extent such that a dead water area forming empty side in the slipstream of the shield plate during operation of the steam turbine extends axially along the entire base plate.
  • the dead water area is designed in particular recirculating and the main steam flow has no direct contact with the base plate along the dead water area, so that results in a fluidically effective pitch angle of the cover plate by the radial position of the inner edge of the shield plate.
  • the top plate bottom since the top plate bottom does not directly guide the main steam flow, the top plate bottom need not be contacted by the main steam flow accordingly.
  • the shield plate is preferably constructed in such a way that the dead water region is continuously maintained during a flow around the rotor blade and it is not possible for a transient vortex shedding to take place from the shield plate. This ensures that the transitional area from the blade tip to the base plate is protected from drop impact erosion during the entire operation of the steam turbine. Further, an occurrence prevented by vortex shedding caused vibrations.
  • the blade tip is preferably covered with an erosion-resistant protective material between the shield plate and the base plate, so that the blade tip is protected in the region of the blade leading edge from drop impact erosion.
  • the protective material is to glove over the blade areas that it should protect, for example, over areas of the blade tip and / or the base plate and / or the shield plate.
  • the protective material can also be replaced during maintenance or inspection work. As a result, it follows that the protective material needs to be formed in its durability only as specified by the scheduled maintenance or inspection intervals. Furthermore, with the shaping of the protective material, the flow around the cover plate can be favorably influenced.
  • the blade tip between the shield plate and the base plate is preferably covered with the erosion-resistant protective material in such a way that the shield plate at the radial inner edge can be bypassed free of the main vapor flow. It is further preferred that the blade leading edge is covered with the erosion-resistant protective material, whereby the blade leading edge is protected from drop impact erosion.
  • a blade 1 for a steam turbine is shown.
  • the rotor blade 1 comprises an airfoil 2, which has a blade leading edge 3 and a blade tip 4, and a cover plate 5.
  • the cover plate 5 comprises a shield plate 6 and a base plate 7, with which the cover plate 5 is attached to the blade tip 4.
  • the base plate 7 is aligned in the installed state substantially parallel to a machine axis 8 of the steam turbine.
  • the shield plate 6 is formed radially inwardly projecting, which is also arranged from the blade leading edge 3 at a distance.
  • the cover plate 5 also has a plurality of sealing tips 9 for sealing a gap between the base plate 7 and a steam turbine housing 10.
  • blade 1 is subjected to a main steam flow, represented by the arrows 11, which flows around the blade 2 and the cover plate 5.
  • Die Schaufelblatt 2 und die Deckplatte 5 Sind über die sowand 5 °.
  • a dead water region 13 is formed, which extends axially along the base plate 7.
  • the dead water region 13 is arranged at a transition region 14 between the blade tip 4 and the base plate 7.
  • the dead water area 13 is formed by a vortex 15, from which the main steam flow is guided.
  • the vortex 15 defines the fluidically effective pitch angle 16 of the cover plate 5, which is predetermined by the construction of the shield plate 6. Since the pitch angle 16 depends on the position of the radially inner edge of the shield plate 6 and not on the blade side contour of the base plate 7, the base plate 7 is plate-like and thus lightweight.
  • the base plate 7 can therefore be made long in its axial extension without the Blade 1 unacceptably high mechanical load. Due to the large axial extension of the base plate 7 additional sealing tips 9 can be provided on the base plate 7, whereby the sealing efficiency of the cover plate 5 is increased and thus the thermodynamic efficiency of the associated steam turbine is increased.
  • Fig. 2 shows the blade 1 according to the invention, which is provided with an erosion-resistant protective material 17.
  • the protective material 17 is mounted in the region of the blade tip 4 between the shield plate 6 and the base plate 7 and protects the drop zone erosion particularly vulnerable transition region 14 and parts of the blade leading edge 3.
  • the protective material 17 is also formed such that it in the course of maintenance and Inspection work can be easily changed.
  • the protective material 17 is attached to the blade leading edge 3, whereby this area is protected against drop impact erosion.
  • Fig. 4 shows a further embodiment of the blade 1 with the attached protective material 17. Due to the shape of the protective material 17, the flow around the blade 1 is favorably influenced, whereby the transition region 14 is protected. Furthermore, the protective material 17 is protected from tearing impact by the shield plate 6 at the particularly stressed areas, whereby the intervals for changing the protective material 17 are long.
  • Fig. 5 shows a blade 101 for a steam turbine according to the prior art.
  • a main steam flow represented by the arrows 102, is guided in the region of a blade tip 103 of the rotor blade 101 by means of a shroud 104.
  • the shroud 104 must be contoured accordingly, in order to be able to guide the main steam flow on its blade-side contour 105 and on its side facing the steam turbine housing (not shown) to close the gap by means of sealing tips 106.
  • the mass of the shroud 104 is due to this construction so large compared to the mass of the Cover plate 5 according to the invention that the axial extent of the shroud 104 must be kept short. As a result, only a few sealing tips 106 can be provided on the shroud 104. This affects the sealing efficiency of the shroud 104 and thus the thermodynamic efficiency of the steam turbine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP10186573A 2010-10-05 2010-10-05 Aube de rotor carénée pour une turbine à vapeur Withdrawn EP2439376A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10186573A EP2439376A1 (fr) 2010-10-05 2010-10-05 Aube de rotor carénée pour une turbine à vapeur
PCT/EP2011/067366 WO2012045765A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur
EP11766987.9A EP2609292A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur
CN201180048491.1A CN103154436B (zh) 2010-10-05 2011-10-05 用于蒸汽轮机的具有盖板的转子叶片

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10186573A EP2439376A1 (fr) 2010-10-05 2010-10-05 Aube de rotor carénée pour une turbine à vapeur

Publications (1)

Publication Number Publication Date
EP2439376A1 true EP2439376A1 (fr) 2012-04-11

Family

ID=43754769

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10186573A Withdrawn EP2439376A1 (fr) 2010-10-05 2010-10-05 Aube de rotor carénée pour une turbine à vapeur
EP11766987.9A Withdrawn EP2609292A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11766987.9A Withdrawn EP2609292A1 (fr) 2010-10-05 2011-10-05 Aube mobile à plaque de recouvrement pour turbine à vapeur

Country Status (3)

Country Link
EP (2) EP2439376A1 (fr)
CN (1) CN103154436B (fr)
WO (1) WO2012045765A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014020307A (ja) * 2012-07-19 2014-02-03 Mitsubishi Heavy Ind Ltd ガスタービン
WO2020021192A1 (fr) * 2018-07-24 2020-01-30 Safran Aircraft Engines Aube de turbine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB214985A (en) * 1923-12-22 1925-02-19 Erste Bruenner Maschinen Fab Improvements in and relating to steam or gas turbines
EP1780379A2 (fr) * 2005-10-31 2007-05-02 Kabushiki Kaisha Toshiba Turbine à vapeur et couche de matériaux hydrophile utilisée pour celle-ci

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010005910A (ko) * 1997-04-01 2001-01-15 칼 하인쯔 호르닝어 유동 채널 또는 터빈 블레이드의 벽 표면 구조
US7422415B2 (en) * 2006-05-23 2008-09-09 General Electric Company Airfoil and method for moisture removal and steam injection
EP2072757A1 (fr) * 2007-12-20 2009-06-24 Siemens Aktiengesellschaft Bouclier anti-érosion pour aube rotative

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB214985A (en) * 1923-12-22 1925-02-19 Erste Bruenner Maschinen Fab Improvements in and relating to steam or gas turbines
EP1780379A2 (fr) * 2005-10-31 2007-05-02 Kabushiki Kaisha Toshiba Turbine à vapeur et couche de matériaux hydrophile utilisée pour celle-ci

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014020307A (ja) * 2012-07-19 2014-02-03 Mitsubishi Heavy Ind Ltd ガスタービン
US9360216B2 (en) 2012-07-19 2016-06-07 Mitsubishi Heavy Industries Aero Engines, Ltd. Gas turbine
WO2020021192A1 (fr) * 2018-07-24 2020-01-30 Safran Aircraft Engines Aube de turbine
FR3084398A1 (fr) * 2018-07-24 2020-01-31 Safran Aircraft Engines Aube de turbine
US11428109B2 (en) 2018-07-24 2022-08-30 Safran Aircraft Engines Turbine blade

Also Published As

Publication number Publication date
CN103154436B (zh) 2015-08-19
CN103154436A (zh) 2013-06-12
WO2012045765A1 (fr) 2012-04-12
EP2609292A1 (fr) 2013-07-03

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