EP2220342A1 - Plaque de protection contre l'érosion pour aubes mobiles - Google Patents

Plaque de protection contre l'érosion pour aubes mobiles

Info

Publication number
EP2220342A1
EP2220342A1 EP08864232A EP08864232A EP2220342A1 EP 2220342 A1 EP2220342 A1 EP 2220342A1 EP 08864232 A EP08864232 A EP 08864232A EP 08864232 A EP08864232 A EP 08864232A EP 2220342 A1 EP2220342 A1 EP 2220342A1
Authority
EP
European Patent Office
Prior art keywords
protection shield
erosion protection
rotor
blade
erosion
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
Application number
EP08864232A
Other languages
German (de)
English (en)
Other versions
EP2220342B1 (fr
Inventor
Norbert Sürken
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 PL08864232T priority Critical patent/PL2220342T3/pl
Priority to EP08864232A priority patent/EP2220342B1/fr
Publication of EP2220342A1 publication Critical patent/EP2220342A1/fr
Application granted granted Critical
Publication of EP2220342B1 publication Critical patent/EP2220342B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • 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
    • F01D5/146—Shape, i.e. outer, aerodynamic form of blades with tandem configuration, split blades or slotted blades
    • 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
    • F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
    • 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
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • 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
    • 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
    • F05D2250/30—Arrangement of components
    • F05D2250/34—Arrangement of components translated
    • 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
    • F05D2260/95—Preventing corrosion

Definitions

  • the invention relates to a blade comprising an airfoil and a blade root, wherein the airfoil has a suction and pressure side and an inflow and outflow edge.
  • turbomachines among other things, runners and vanes are used. Hydraulic turbines, steam and gas turbines, wind turbines, centrifugal pumps and centrifugal compressors as well as propellers are summarized under the collective term turbomachinery. All these machines have in common that they serve the purpose of extracting energy from one fluid in order to drive another machine or, conversely, to supply energy to a fluid in order to increase its pressure.
  • steam is used as the fluid.
  • This fluid is also referred to as flow medium. It is usual that the steam initially flows into a high pressure turbine, said steam has a temperature of up to 620 0 C and a pressure of up to 320bar. After the flow through the
  • High-pressure turbine section flows through the flow medium through a medium-pressure turbine section and finally through a low-pressure turbine section.
  • the pressure and the temperature of the vapor decreases here.
  • the expansion of the steam in the low-pressure turbine part it can happen that spontaneously
  • mist droplets which are also called primary droplets and are very small.
  • Such primary droplets grow to a diameter of about 0.2 ⁇ m.
  • These primary droplets accumulate on the vanes and blades and form a larger one as a result of a water film
  • the invention whose object is to provide a simple way to avoid damage to a blade, which is loaded by water droplets, which in partial load operations a locally negative axial velocity in the region of the blade trailing edge and thereby hit the running blade trailing edge.
  • a blade comprising an airfoil and a blade root, wherein the airfoil has a suction and pressure side and an inflow and outflow edge, wherein an erosion protection shield for preventing drop impact erosion is arranged in front of the trailing edge.
  • This further component is an erosion protection shield which is arranged in front of the trailing edge in such a way that the drops of water which occur in the partial load operation do not strike the blade outlet edge but the erosion protection shield. Accordingly, the drops of water can no longer cause any damage to the trailing edge of the blade since they are prevented in the first place from hitting the blade since they hit the erosion shield and are thereby slowed down or dissolved.
  • These measures according to the invention eliminate the measures known in the prior art for avoiding damage by water droplets.
  • the invention has the advantage that virtually no changes need to be made to the existing blade.
  • the only change to the rotor blade is to allow the inclusion or arrangement of erosion protection shield.
  • the erosion protection shield is in this case arranged such that drops of water which occur in partial load operation and have a locally negative axial velocity in the region of the blade trailing edge can not impinge on the blade trailing edge. Damage is thus avoided from the outset.
  • the erosion protection shield arranged spaced from the trailing edge of the blade root.
  • the distance of the erosion protection shield to the trailing edge should be such It can be chosen that the flow of the steam does not suffer losses in the relaxation in a turbine stage.
  • the erosion protection shield is aligned along the longitudinal orientation of the airfoil.
  • the damage mainly occurs in the vicinity of the blade root and propagates in the longitudinal direction of the blade. An alignment of the erosion protection shield along the longitudinal alignment therefore leads to a prevention of further damage.
  • the blade has a length L, wherein the length of erosion protection shield is selected such that the length 1% - 100% of the length L of the rotor blade has.
  • the blade has a chord length S, wherein the erosion shield is formed such that the width of the erosion shield is about 5% to 75% of the chord length S.
  • the blade has a pressure side and a suction side, wherein the erosion protection shield is arranged in front of the suction side. It has been shown that most damages occur on the suction side of the blade. Appropriately, it is therefore proposed to arrange the erosion protection shield in front of this suction side.
  • the erosion protection shield is frictionally connected to the blade root.
  • Equally expedient is to connect the erosion protection shield cohesively or positively with the blade root.
  • a frictional connection is created by the application of force, which is generated by suitable bias.
  • the cohesion of the non-positive connection can be ensured purely by static friction.
  • Formative connections are the result of the interaction of at least two partners.
  • the positive connection is caused by forces caused by operating conditions.
  • Cohesive compounds are characterized by bonding partners that are held together by atomic or molecular forces.
  • the erosion protection shield and the blade are formed as a single integral component.
  • the erosion protection shield can be connected to the turbine blade with a comparatively high binding force or holding force.
  • the erosion protection shield has a trailing edge and a leading edge, the trailing edge projecting beyond the trailing edge of the blade.
  • the erosion protection shield covers, as it were, a larger area, preventing the droplets from bouncing on subsequently arranged moving blades. This makes it possible to reduce the erosion protection signs over the entire blade ring.
  • the erosion protection shield has a turbine profiling with suction and pressure side.
  • the erosion shield is able, as well as the blade, to convert the thermal energy of the vapor into kinetic energy.
  • the erosion shield is formed of an erosion resistant material, such as Stellite, Ultimet, ⁇ - or ß-titanium or hardened steel.
  • the erosion protection shield has a dovetail foot, wherein the blade root is designed for receiving the dovetail foot. As a result, a fairly simple and cost-effective way is shown to attach the erosion protection shield to the turbine blade root.
  • the Erosi- onstikschild is bent around the longitudinal axis. Depending on the present flow conditions of the flow medium, this can lead to an improvement in the efficiency.
  • Figure 1 is a perspective view of a part of a
  • Figure 2 is another perspective view of a
  • Figure 3 is a side view of a blade with
  • Figure 4 is a perspective view of a part of a
  • Figure 5 is a side view of the erosion protection shield.
  • FIG. 1 shows a perspective view of a part of a turbine stage 1.
  • the turbine stage 1 comprises a plurality of rotor blades 2, which are arranged around a common rotational axis not shown in detail in FIG. 1 in a rotor 3.
  • the blades 2 rotate at a speed of up to 3600 revolutions per minute.
  • the rotor blade 2 has an airfoil 4 and a blade root 5.
  • the blade 4 is profiled and has a suction side and not in Figure 1 visible pressure side 7.
  • the blade 2 has a leading edge 8 not visible in FIG. 1 and a trailing edge 9.
  • the blade root 5 is held on the rotor 3 via a lavall, rider, plug, hammer, sawtooth or pine tree foot.
  • a Christmas tree foot is exemplified.
  • an erosion protection shield 10 is arranged on the blade root 5.
  • the erosion protection shield 10 is made of an erosion resistant material, such as e.g. stellite,
  • the erosion protection shield 10 is arranged to prevent drop impact erosion in front of the trailing edge 9.
  • the blade 2 is formed along a longitudinal orientation 11, wherein also the erosion protection shield 10 is aligned along this longitudinal direction 11.
  • the longitudinal alignment 11 is substantially identical to the radial direction, which is perpendicular to the rotation axis, not shown.
  • the erosion protection shield 10 is spaced at a distance d from the outflow edge 9.
  • the distance d is in this case selected such that it leads to low flow losses in the turbine stage 1.
  • the blade 2 has a length L.
  • the erosion protection shield 10 in this case has a length of 1% to 100% of the length L.
  • the airfoil 4 has a chord length S, wherein the erosion protection shield 10 has a width B of 5% to 75% of the chord length S.
  • the erosion protection shield 10 is frictionally with the
  • Blade foot 5 connected.
  • the blade root 5 a dovetail foot-like recess 12, in which the Erosion protection shield 10, which has a dovetail foot 13, can be inserted.
  • the erosion protection shield 10 is connected to the blade root 5 in a cohesive or form-fitting manner.
  • the erosion protection shield 10 is arranged in front of the suction side 6 of the airfoil 4.
  • the dovetail 13 is straight.
  • the dovetail 13 may be executed bent, which is not shown in Figure 4.
  • the recess 12 is formed straight for the dovetail 13 and is directed substantially parallel to the suction side 6 at the trailing edge 9 substantially.
  • the erosion protection shield 10 and the blade 2 can be formed in a alternative embodiment of a single integral component. This can be done by precision finish forging, investment casting, envelope forging with subsequent milling, milling, eroding or other known methods.
  • FIG. 2 shows a perspective view of a part of a turbine stage 1.
  • the erosion protection shield 10 is shown in the installed state.
  • FIG. 3 shows a side view of the turbine stage 1.
  • the erosion protection shield 10 has a front edge 14 and a trailing edge 15.
  • the erosion protection shield 10 is in this case arranged on the blade root 5 such that the trailing edge 15 protrudes beyond the trailing edge 9.
  • FIG. 5 shows a side view of the erosion protection shield 10.
  • the erosion protection shield 10 is formed in longitudinal direction 11 with a rectangular or triangular profile when viewed in cross-section.
  • the erosion protection shield 10 a turbine profiling with suction and pressure side, which is not shown in Figure 5.
  • the erosion protection shield 10 can be designed bent around the longitudinal alignment 11, which leads to a bent dovetail foot 13, which are arranged in a curved recess 12.
  • the trailing edge 15 of the erosion protection shield 10 protrudes beyond the trailing edge 9 by a distance 1.
  • the erosion protection shield 10 can be arranged directly on the rotor 3 in an alternative embodiment, which is not shown in the figures 1 to 5.
  • the erosion protection shield 10 may be provided with support wings in an alternative embodiment.
  • the support wings are designed such that they bear against the blade profile. This increases the range of application of erosion protection shield 10.
  • the support wings are not shown in more detail in the figures.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Architecture (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

La présente invention concerne une aube mobile (2) pour turbomachine, en particulier une turbine à vapeur, comportant une aube (4) et un pied d'aube (5), l'aube (4) présentant un côté aspiration (6) et un côté pression (7) ainsi qu'un bord d'affluence (8) et un bord d'écoulement (9), une plaque de protection contre l'érosion (10), destinée à empêcher l'érosion par éclaboussure, étant placée à distance du bord d'écoulement (9).
EP08864232A 2007-12-20 2008-11-27 Plaque de protection contre l'érosion pour aubes mobiles Not-in-force EP2220342B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL08864232T PL2220342T3 (pl) 2007-12-20 2008-11-27 Ekran ochronny przed erozją dla łopatek wirnika
EP08864232A EP2220342B1 (fr) 2007-12-20 2008-11-27 Plaque de protection contre l'érosion pour aubes mobiles

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP07024843A EP2072757A1 (fr) 2007-12-20 2007-12-20 Bouclier anti-érosion pour aube rotative
PCT/EP2008/066307 WO2009080439A1 (fr) 2007-12-20 2008-11-27 Plaque de protection contre l'érosion pour aubes mobiles
EP08864232A EP2220342B1 (fr) 2007-12-20 2008-11-27 Plaque de protection contre l'érosion pour aubes mobiles

Publications (2)

Publication Number Publication Date
EP2220342A1 true EP2220342A1 (fr) 2010-08-25
EP2220342B1 EP2220342B1 (fr) 2012-12-26

Family

ID=39313050

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07024843A Withdrawn EP2072757A1 (fr) 2007-12-20 2007-12-20 Bouclier anti-érosion pour aube rotative
EP08864232A Not-in-force EP2220342B1 (fr) 2007-12-20 2008-11-27 Plaque de protection contre l'érosion pour aubes mobiles

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP07024843A Withdrawn EP2072757A1 (fr) 2007-12-20 2007-12-20 Bouclier anti-érosion pour aube rotative

Country Status (6)

Country Link
US (1) US20100322775A1 (fr)
EP (2) EP2072757A1 (fr)
JP (1) JP5064570B2 (fr)
CN (1) CN101903618B (fr)
PL (1) PL2220342T3 (fr)
WO (1) WO2009080439A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2439376A1 (fr) * 2010-10-05 2012-04-11 Siemens Aktiengesellschaft Aube de rotor carénée pour une turbine à vapeur
ITMI20120779A1 (it) * 2012-05-08 2013-11-09 Franco Tosi Meccanica S P A Stadio rotorico di turbina assiale a protezione anti-erosione migliorata
US9644483B2 (en) * 2013-03-01 2017-05-09 General Electric Company Turbomachine bucket having flow interrupter and related turbomachine
FR3045710B1 (fr) * 2015-12-21 2018-01-26 Safran Aircraft Engines Bouclier de bord d'attaque

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702222A (en) * 1971-01-13 1972-11-07 Westinghouse Electric Corp Rotor blade structure
US3751182A (en) * 1971-08-20 1973-08-07 Westinghouse Electric Corp Guide vanes for supersonic turbine blades
JPS5321045B2 (fr) * 1972-08-18 1978-06-30
JPS55100005U (fr) * 1979-01-08 1980-07-11
JPS55134703A (en) * 1979-04-06 1980-10-20 Hitachi Ltd Blade structure
US4512718A (en) * 1982-10-14 1985-04-23 United Technologies Corporation Tandem fan stage for gas turbine engines
JPH03267505A (ja) * 1990-03-19 1991-11-28 Hitachi Ltd エロージヨンシールド付きタービン動翼
JP3313487B2 (ja) * 1993-11-30 2002-08-12 株式会社東芝 蒸気タービンノズル
DE4411679C1 (de) * 1994-04-05 1994-12-01 Mtu Muenchen Gmbh Schaufelblatt in Faserverbundbauweise mit Schutzprofil
GB2293631B (en) * 1994-09-30 1998-09-09 Gen Electric Composite fan blade trailing edge reinforcement
JPH08232604A (ja) * 1995-02-27 1996-09-10 Toshiba Corp 蒸気タービンのエロージョン防止装置
JPH08254104A (ja) * 1995-03-16 1996-10-01 Mitsubishi Heavy Ind Ltd 蒸気タービン内湿分除去装置
JP4441836B2 (ja) * 2000-03-03 2010-03-31 株式会社Ｉｈｉ 二次流れ抑制翼列
JP3950308B2 (ja) * 2001-07-16 2007-08-01 三菱重工業株式会社 蒸気タービン内湿分除去装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009080439A1 *

Also Published As

Publication number Publication date
EP2220342B1 (fr) 2012-12-26
PL2220342T3 (pl) 2013-05-31
WO2009080439A1 (fr) 2009-07-02
CN101903618A (zh) 2010-12-01
CN101903618B (zh) 2015-08-05
JP2011506841A (ja) 2011-03-03
EP2072757A1 (fr) 2009-06-24
JP5064570B2 (ja) 2012-10-31
US20100322775A1 (en) 2010-12-23

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