EP2220342B1 - Erosion protection shield for rotor blades - Google Patents
Erosion protection shield for rotor blades Download PDFInfo
- Publication number
- EP2220342B1 EP2220342B1 EP08864232A EP08864232A EP2220342B1 EP 2220342 B1 EP2220342 B1 EP 2220342B1 EP 08864232 A EP08864232 A EP 08864232A EP 08864232 A EP08864232 A EP 08864232A EP 2220342 B1 EP2220342 B1 EP 2220342B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- rotor blade
- erosion shield
- erosion
- protection shield
- 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.)
- Not-in-force
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- 230000003628 erosive effect Effects 0.000 title claims description 63
- 239000000463 material Substances 0.000 claims description 4
- 229910001040 Beta-titanium Inorganic materials 0.000 claims description 3
- 229910000760 Hardened steel Inorganic materials 0.000 claims description 3
- 229910001347 Stellite Inorganic materials 0.000 claims description 3
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000843 ultimet Inorganic materials 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims 1
- 239000010936 titanium Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000012530 fluid Substances 0.000 description 4
- 238000005242 forging Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Images
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 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 large binding force or holding force.
- the erosion protection shield is formed of an erosion-resistant material, such as Stellite, Ultimet, ⁇ - or ⁇ -titanium or hardened steel.
- the erosion protection shield 10 is bonded or positively connected to the blade root 5.
- FIG. 2 is a perspective view of a portion of a turbine stage 1 can be seen.
- the erosion protection shield 10 is shown in the installed state.
- the FIG. 5 shows a side view of the erosion protection shield 10.
- the erosion protection shield 10 is seen in cross section in the longitudinal direction 11 formed with a rectangular or triangular profile.
- the erosion protection shield 10 has a turbine profiling with suction and pressure side, which in the FIG. 5 not shown.
- the erosion protection shield 10 can be designed bent around the longitudinal alignment 11, which leads to a curved dovetail 13, which are arranged in a curved recess 12.
- the erosion protection shield 10 can be arranged in an alternative embodiment directly on the rotor 3, which in the FIGS. 1 to 5 not shown.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
Die Erfindung betrifft eine Laufschaufel umfassend ein Schaufelblatt und einen Schaufelfuß, wobei das Schaufelblatt eine Saug- und Druckseite sowie eine Anström- und Abströmkante aufweist.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.
In Strömungsmaschinen werden unter anderem Lauf- und Leitschaufeln eingesetzt. Unter der Sammelbezeichnung Strömungsmaschinen werden Wasserturbinen, Dampf- und Gasturbinen, Windräder, Kreiselpumpen und Kreiselverdichter sowie Propeller zusammengefasst. Allen diesen Maschinen ist gemeinsam, dass sie dem Zweck dienen, einem Fluid Energie zu entziehen, um damit eine andere Maschine anzutreiben oder umgekehrt einem Fluid Energie zuzuführen, um dessen Druck zu erhöhen.In 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.
In einer Dampfturbine als Ausführungsform einer Strömungsmaschine wird Dampf als Fluid verwendet. Dieses Fluid wird auch als Strömungsmedium bezeichnet. Es ist üblich, dass der Dampf zunächst in eine Hochdruckteilturbine einströmt, wobei dieser Dampf eine Temperatur von bis zu 620°C und einen Druck von bis zu 320bar aufweist. Nach der Durchströmung durch die Hochdruck-Teilturbine strömt das Strömungsmedium durch eine Mitteldruck-Teilturbine und schließlich durch eine Niederdruck-Teilturbine. Der Druck und die Temperatur des Dampfes nimmt hierbei ab. Bei der Entspannung des Dampfes in der Niederdruck-Teilturbine kann es vorkommen, dass durch spontane Kondensation sich Nebeltröpfchen bilden, die auch als Primärtröpfchen bezeichnet werden und sehr klein sind. Solche Primärtröpfchen wachsen auf Durchmesser von etwa 0,2µm an. Diese Primärtröpfchen sammeln sich auf den Leit- und Laufschaufeln an und bilden in Folge eines Wasserfilms einen größeren Sekundärtropfen mit einem Durchmesser bis etwa 400µm. Noch größere Wassertröpfchen sind in der Dampfturbinenströmung nicht stabil, da sie wieder zerstäubt werden.In a steam turbine as an embodiment of a turbomachine, steam is used as the fluid. This fluid is also referred to as flow medium. It is common that the steam first flows into a high-pressure turbine part, this steam having a temperature of up to 620 ° C and a pressure of up to 320bar. After flowing through the high-pressure turbine section, the flow medium flows through a medium-pressure turbine section and finally through a low-pressure turbine section. The pressure and the temperature of the vapor decreases here. During the expansion of the steam in the low-pressure turbine part, spontaneous condensation may cause mist droplets to form, which are also called primary droplets and are very small. Such primary droplets grow to a diameter of about 0.2 μm. These primary droplets accumulate on the guide and moving blades and, as a result of a water film, form a larger secondary droplet with a diameter of up to about 400 μm. Even larger water droplets are not stable in the steam turbine flow since they are atomized again.
Diese Tropfen verursachen die sogenannte Tropfenschlagerosion, bei der beim Aufprall eines Tropfens auf die Laufschaufel es zu einem Materialabtrag kommen kann.These drops cause the so-called drop impact erosion, which can lead to a material removal on the impact of a drop on the blade.
Es kann zu dem vorkommen, dass für verschiedene Betriebspunkte der Niederdruck-Teilturbine, beispielsweise im Teillastbetrieb, es zu örtlich negativen Axialgeschwindigkeiten im Bereich der Laufschaufelhinterkante kommen kann. Diese Bewegung des Dampfes führt dazu, dass im Dampf enthaltene Wassertröpfchen zurück in die Beschaufelung strömen. Die Wassertröpfchen haben hierbei eine solch geringe Umfangskomponente, dass sie mit hoher Relativgeschwindigkeit auf die Hinterkante des Laufschaufelprofils auf der Saugseite treffen und somit zu deutlichen Erosionsschädigungen führen. Dies führt zu einer erheblichen Schädigung der Beschaufelung.It may happen that for different operating points of the low-pressure turbine part, for example, in partial load operation, it may come to locally negative axial velocities in the region of the blade trailing edge. This movement of the steam causes water droplets contained in the steam to flow back into the blading. The water droplets in this case have such a small peripheral component that they strike the trailing edge of the blade profile on the suction side at high relative speed and thus lead to significant erosion damage. This leads to considerable damage to the blading.
Um solche Schädigungen zu vermeiden ist es zum einen bekannt, die im Dampf vorhandenen Wassertropfen durch entsprechende Betriebsbereiche zu minimieren. Des Weiteren kann eine Verdickung der Schaufelhinterkanten berücksichtigt werden. Ebenso ist es bekannt, bei größeren Erosionsschädigungen im Hinterkantenbereich Schleifmaßnahmen durchzuführen. Des Weiteren ist bekannt, die Hinterkante zu härten, um die Widerstandsfähigkeit der Schaufel zu erhöhen. Schließlich ist es auch bekannt die Bildung der Sekundärtropfen mittels Absaugeinrichtungen und gezieltem Axialspaltdesign zu vermeiden.In order to avoid such damage, it is known on the one hand to minimize the water droplets present in the steam by means of appropriate operating ranges. Furthermore, a thickening of the blade trailing edges can be taken into account. It is also known to carry out at larger erosion damage in the trailing edge area grinding measures. Furthermore, it is known to cure the trailing edge to increase the resistance of the blade. Finally, it is also known to avoid the formation of secondary drops by means of suction and targeted Axialspaltdesign.
Die
Die
Wünschenswert wäre es eine einfache Möglichkeit zu haben, um die Beschädigung der Laufschaufeln durch die im Teillastbe trieb auftretenden Wassertröpfchen, die örtlich negative Axialgeschwindigkeiten aufweisen, zu vermeiden.It would be desirable to have an easy way to damage the blades by the partial load drove occurring water droplets, which have locally negative axial velocities to avoid.
An dieser Stelle setzt die Erfindung an, dessen Aufgabe es ist, eine einfache Möglichkeit anzugeben, um eine Schädigung einer Laufschaufel zu vermeiden, die durch Wassertropfen belastet wird, die in Teillastbetrieben eine örtlich negative Axialgeschwindigkeit im Bereich der Laufschaufelhinterkante aufweisen und dadurch auf die Laufschaufelhinterkante treffen.At this point, the invention begins, whose task 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 blade trailing edge.
Diese Aufgabe wird gelöst durch eine Laufschaufel gemäß Anspruch 1.This object is achieved by a blade according to
Mit der Erfindung wird vorgeschlagen ein weiteres Bauteil neben dem Rotor und den Laufschaufeln einzusetzen. Dieses weitere Bauteil ist ein Erosionsschutzschild, das derart vor die Abströmkante angeordnet wird, dass die im Teillastbetrieb auftretenden Wassertropfen nicht auf die Laufschaufelabströmkante treffen, sondern auf das Erosionsschutzschild. Die Wassertropfen können demnach keine Schädigung mehr an der Abströmkante der Laufschaufel hervorrufen, da sie von vornherein gehindert werden, auf die Laufschaufel zu treffen, da sie auf das Erosionsschutzschild treffen und dadurch abgebremst bzw. aufgelöst werden. Durch diese erfindungsgemäßen Maßnahmen entfallen die im Stand der Technik bekannten Maßnahmen zur Vermeidung der Schädigung durch Wassertropfen. Insbesondere weist die Erfindung den Vorteil auf, dass an der bestehenden Laufschaufel so gut wie keine Änderungen vorgenommen werden müssen. Die einzige Änderung an der Laufschaufel besteht darin, die Aufnahme bzw. Anordnung des Erosionsschutzschildes zu ermöglichen. Das Erosionsschutzschild ist hierbei derart angeordnet, dass Wassertropfen, die im Teillastbetrieb auftreten und eine örtlich negative Axialgeschwindigkeit im Bereich der Laufschaufelhinterkante aufweisen, nicht auf die Laufschaufelhinterkante auftreffen können. Eine Schädigung ist somit von vornherein vermieden.With the invention it is proposed to use a further component in addition to the rotor and the rotor blades. 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 trailing edge, but rather 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 strike the erosion protection 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. In particular, the invention has the advantage that virtually no changes need to be made to the existing blade. The only change to the 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.
Das Schaufelblatt weist eine Druckseite und eine Saugseite auf, wobei das Erosionsschutzschild vor der Saugseite angeordnet ist. Es hat sich gezeigt, dass die meisten Beschädigungen an der Saugseite des Schaufelblattes auftreten. Zweckmäßigerweise wird daher vorgeschlagen, das Erosionsschutzschild vor dieser Saugseite anzuordnen.The airfoil 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.
Das Erosionsschutzschild weist eine Hinterkante und eine Vorderkante auf, wobei die Hinterkante über die Abströmkante der Laufschaufel ragt. Dies führt dazu, dass das Erosionsschutzschild sozusagen einen größeren Bereich abdeckt, wodurch die Tröpfchen daran gehindert werden, auf nachfolgend angeordnete Laufschaufeln zu prallen. Dadurch ist eine Reduzierung der Erosionsschutzschilder über den gesamten Schaufelkranz möglich. Somit wäre es möglich, die Anzahl der Erosionsschutzschilder zu vermindern, um dadurch kostengünstiger eine Strömungsmaschine zu fertigen.The erosion shield has a trailing edge and a leading edge with the trailing edge projecting beyond the trailing edge of the blade. As a result, 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. Thus, it would be possible to reduce the number of anti-erosion signs to thereby more cost-effectively manufacture a turbomachine.
Das Erosionsschutzschild ist zur Abströmkante des Schaufelfußes beabstandet angeordnet. Der Abstand des Erosionsschutzschildes zur Abströmkante sollte hierbei derart gewählt werden, dass die Strömung des Dampfes keine Verluste bei der Entspannung in einer Turbinenstufe erleidet.The erosion protection shield is arranged at a distance from the trailing edge of the blade root. The distance of the erosion protection shield to the trailing edge should in this case be selected such that the flow of the steam suffers no losses during the relaxation in a turbine stage.
In einer vorteilhaften Weiterbildung der Erfindung ist das Erosionsschutzschild entlang der Längsausrichtung des Schaufelblattes ausgerichtet. Die Schädigungen tauchen vorwiegend in der Nähe des Schaufelfußes auf und breiten sich in der Längsrichtung der Schaufel aus. Eine Ausrichtung des Erosionsschutzschildes entlang der Längsausrichtung führt daher zu einer Verhinderung einer weiteren Beschädigung.In an advantageous development of the invention, 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.
In einer vorteilhaften Weiterbildung weist die Laufschaufel eine Länge L auf, wobei die Länge des Erosionsschutzschildes derart gewählt ist, dass die Länge 1% - 100% der Länge L der Laufschaufel aufweist.In an advantageous development, the blade has a length L, wherein the length of erosion protection shield is selected such that the
In einer vorteilhaften Weiterbildung weist das Schaufelblatt eine Sehnenlänge-S-auf, wobei das Erosionsschutzschild derart ausgebildet ist, dass die Breite des Erosionsschutzschildes ungefähr 5% bis 75% der Sehnenlänge S beträgt. Durch die gezielte Auswahl der Größe des Erosionsschutzschildes ist eine genaue Anpassung an die Betriebsbedingungen der Strömurigsmaschine möglich.In an advantageous development, the airfoil has a chord length-S, wherein the erosion protection shield is designed such that the width of the erosion protection shield is approximately 5% to 75% of the chord length S. Through the targeted selection of the size of the erosion protection shield, an exact adaptation to the operating conditions of the Strömurigsmaschine is possible.
In einer vorteilhaften Weiterbildung ist das Erosionsschutzschild kraftschlüssig mit dem Schaufelfuß verbunden. Ebenso zweckmäßig ist es, das Erosionsschutzschild stoffschlüssig oder formschlüssig mit dem Schaufelfuß zu verbinden.In an advantageous development, 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.
Eine kraftschlüssige Verbindung entsteht durch die Anwendung von Kraft, welche durch geeignete Vorspannung erzeugt wird. Beispielsweise kann der Zusammenhalt der kraftschlüssigen Verbindung rein durch Haftreibung gewährleistet sein. Formschlüssige Verbindungen hingegen entstehen durch das Ineinandergreifen von mindestens zwei Verbindungspartnern. Der Formschluss wird dabei durch Kräfte verursacht, die durch Betriebsbedingungen entstehen. Stoffschlüssige Verbindungen sind durch Verbindungspartner gekennzeichnet, die durch atomare oder molekulare Kräfte zusammengehalten werden.A frictional connection is created by the application of force, which is generated by suitable bias. For example, the cohesion of the non-positive connection can be ensured purely by static friction. By contrast, positive connections are created by the interaction of at least two connection partners. The positive connection is caused by forces that arise due to operating conditions. Bonded joints are characterized by bonding partners that are held together by atomic or molecular forces.
In einer vorteilhaften Weiterbildung wird das Erosionsschutzschild und die Laufschaufel als ein einziges integrales Bauteil ausgebildet. Durch diese Maßnahme kann das Erosionsschutzschild mit einer vergleichsweise großen Bindekraft bzw. Haltekraft an die Turbinenschaufel verbunden sein.In an advantageous development, the erosion protection shield and the blade are formed as a single integral component. By this measure, the erosion protection shield can be connected to the turbine blade with a comparatively large binding force or holding force.
In einer vorteilhaften Weiterbildung weist das Erosionsschutzschild eine Turbinenprofilierung mit Saug- und Druckseite auf. Dadurch ist das Erosionsschutzschild in der Lage, ebenso wie die Laufschaufel die thermische Energie des Dampfes in kinetische Energie umzuwandeln.In an advantageous development, the erosion protection shield has a turbine profiling with suction and pressure side. As a result, the erosion shield is able, as well as the blade, to convert the thermal energy of the vapor into kinetic energy.
Vorzugsweise ist das Erosionsschutzschild aus einem erosionsbeständigen Material ausgebildet, wie z.B. Stellite, Ultimet, α- oder β-Titan oder gehärtetem Stahl.Preferably, the erosion protection shield is formed of an erosion-resistant material, such as Stellite, Ultimet, α- or β-titanium or hardened steel.
Vorteilhafter Weise weist das Erosionsschutzschild einen Schwalbenschwanzfuß auf, wobei der Schaufelfuß zum Aufnehmen des Schwalbenschwanzfußes ausgebildet ist. Dadurch ist eine recht einfache und kostengünstige Möglichkeit dargestellt, um das Erosionsschutzschild an den Turbinenschaufelfuß zu befestigen.Advantageously, 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.
In einer weiteren vorteilhaften Weiterbildung ist das Erosionsschutzschild um die Längsachse gebogen. Je nach vorliegenden Strömungsverhältnissen des Strömungsmediums kann dies zu einer Verbesserung des Wirkungsgrades führen.In a further advantageous development, the erosion protection shield 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.
Die Erfindung wird beispielhaft anhand der Zeichnungen näher erläutert. Gleiche Bezugszeichen haben in den verschiedenen Figuren die gleiche Bedeutung. Es zeigen, teilweise schematisch und nicht maßstäblich:
Figur 1- eine perspektivische Ansicht eines Teils einer Turbinenstufe,
Figur 2- eine weitere perspektivische Ansicht eines Teils einer Turbinenstufe,
- Figur 3
- eine Seitenansicht einer Laufschaufel mit Erosionsschutzschild,
- Figur 4
- eine perspektivische Ansicht eines Teils einer Laufschaufel mit Schaufelfuß,
Figur 5- eine Seitenansicht des Erosionsschutzschildes.
- FIG. 1
- a perspective view of a part of a turbine stage,
- FIG. 2
- another perspective view of a part of a turbine stage,
- FIG. 3
- a side view of a blade with erosion protection shield,
- FIG. 4
- a perspective view of a portion of a blade with blade root,
- FIG. 5
- a side view of erosion protection shield.
In der
An der Laufschaufel 2 ist am Schaufelfuß 5 ein Erosionsschutzschild 10 angeordnet. Das Erosionsschutzschild 10 ist aus einem erosionsbeständigen Material wie z.B. Stellit, Ultimet, α- oder β-Titan oder gehärtetem Stahl ausgebildet, wobei das Erosionsschutzschild 10 zum Verhindern von Tropfenschlagerosion vor der Abströmkante 9 angeordnet ist.On the
Die Laufschaufel 2 ist entlang einer Längsausrichtung 11 ausgebildet, wobei ebenso das Erosionsschutzschild 10 entlang dieser Längsausrichtung 11 ausgerichtet ist. Die Längsausrichtung 11 ist im Wesentlichen identisch zur radialen Richtung, die senkrecht zur nicht näher dargestellten Rotationsachse ist.The
Das Erosionsschutzschild 10 ist mit einem Abstand d zur Abströmkante 9 beabstandet. Der Abstand d ist hierbei derart gewählt, dass es zu geringen Strömungsverlusten in der Turbinenstufe 1 führt.The
Die Laufschaufel 2 weist eine Länge L auf. Das Erosionsschutzschild 10 weist hierbei eine Länge von 1% bis 100% der Länge L auf.The
Das Schaufelblatt 4 weist eine Sehnenlänge S auf, wobei das Erosionsschutzschild 10 eine Breite B von 5% bis 75% der Sehnenlänge S aufweist.The airfoil 4 has a chord length S, wherein the
Das Erosionsschutzschild 10 wird kraftschlüssig mit dem Schaufelfuß 5 verbunden. Dazu weist der Schaufelfuß 5 eine schwalbenschwanzfußähnliche Ausnehmung 12 auf, in die das Erosionsschutzschild 10, das einen Schwalbenschwanzfuß 13 aufweist, eingefügt werden kann.The
In alternativen Ausführungsformen ist das Erosionsschutzschild 10 stoffschlüssig oder formschlüssig mit dem Schaufelfuß 5 verbunden.In alternative embodiments, the
Wie in den
Das Erosionsschutzschild 10 und die Laufschaufel 2 können in einer alternativen Ausführungsform aus einem einzigen integralen Bauteil ausgebildet werden. Dies kann durch Präzisions-Fertigschmieden, Feingießen, Envelope-Schmieden mit nachfolgender Fräsbearbeitung, Fräsen, Erodieren oder anderen bekannten Verfahren durchgeführt werden.The
In der
In der
Die
Die Hinterkante 15 des Erosionsschutzschildes 10 ragt um einen Abstand 1 über die Abströmkante 9 hinaus.The trailing
Das Erosionsschutzschild 10 kann in einer alternativen Ausführungsform direkt am Rotor 3 angeordnet werden, was in den
Das Erosionsschutzschild 10 kann in einer alternativen Ausführungsform mit Stützflügeln ausgestattet sein. Die Stützflügel sind derart ausgebildet, dass sie sich am Schaufelprofil abstützen. Dadurch erhöht sich der Einsatzbereich des Erosionsschutzschildes 10. Die Stützflügel sind in den Figuren nicht näher dargestellt.The
Claims (14)
- Rotor blade (2)
comprising a main blade part (4) and a blade root (5), wherein the main blade part (4) has a suction side (6) and a pressure side (7) and also a leading edge (8) and a trailing edge (9), wherein an anti-erosion shield (10) is arranged in front of the trailing edge (9) in order to prevent drop impingement erosion, wherein
the anti-erosion shield (10) is spaced apart from the trailing edge (9),
wherein
the anti-erosion shield (10) is arranged in front of the suction side (6),
characterized in that
the anti-erosion shield (10) has a rear edge (15) and a front edge (14), and the rear edge (15) protrudes beyond the trailing edge (9). - Rotor blade (2) according to Claim 1,
wherein the anti-erosion shield (10) is oriented along the longitudinal orientation (11) of the main blade part (4). - Rotor blade (2) according to either of the preceding claims,
wherein the rotor blade (2) has a length (L), and the length of the anti-erosion shield (10) is 1% to 100% of the length (L). - Rotor blade (2) according to one of the preceding claims,
wherein the main blade part (4) has a chord length (S), and the width (b) of the anti-erosion shield (10) is 5% to 75% of the chord length (S). - Rotor blade (2) according to one of the preceding claims, wherein the anti-erosion shield (10) is connected to the blade root (5) in a nonpositively locking manner.
- Rotor blade (2) according to one of Claims 1 to 4, wherein the anti-erosion shield (10) is integrally connected to the blade root (5).
- Rotor blade (2) according to one of Claims 1 to 4, wherein the anti-erosion shield (10) is connected to the blade root (5) in a positively locking manner.
- Rotor blade (2) according to one of the preceding claims,
wherein the anti-erosion shield (10) and the rotor blade (2) are formed as a single, integral component. - Rotor blade (2) according to one of the preceding claims,
wherein the anti-erosion shield (10) has a rectangular or triangular profile, as seen in cross section, in longitudinal orientation (11). - Rotor blade (2) according to one of the preceding claims,
wherein the anti-erosion shield (10) has a turbine profiling with a suction side and a pressure side. - Rotor blade (2) according to one of Claims 1 to 9,
wherein the anti-erosion shield (10) is formed from an erosion-resistant material, e.g. stellite, Ultimet, α-titanium or β-titanium or hardened steel. - Rotor blade (2) according to one of the preceding claims,
wherein the anti-erosion shield (10) has a dovetail root (13), and the blade root (5) is designed to receive the dovetail root (13). - Rotor blade (2) according to one of the preceding claims,
wherein the anti-erosion shield (10) is formed such that it curves around the longitudinal orientation (11). - Rotor blade (2) according to one of the preceding claims,
wherein the anti-erosion shield (10) has support fins to be supported on the rotor blade (2).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08864232A EP2220342B1 (en) | 2007-12-20 | 2008-11-27 | Erosion protection shield for rotor blades |
PL08864232T PL2220342T3 (en) | 2007-12-20 | 2008-11-27 | Erosion protection shield for rotor blades |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07024843A EP2072757A1 (en) | 2007-12-20 | 2007-12-20 | Erosion protection shield for a rotating blade |
EP08864232A EP2220342B1 (en) | 2007-12-20 | 2008-11-27 | Erosion protection shield for rotor blades |
PCT/EP2008/066307 WO2009080439A1 (en) | 2007-12-20 | 2008-11-27 | Erosion protection shield for rotor blades |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2220342A1 EP2220342A1 (en) | 2010-08-25 |
EP2220342B1 true EP2220342B1 (en) | 2012-12-26 |
Family
ID=39313050
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07024843A Withdrawn EP2072757A1 (en) | 2007-12-20 | 2007-12-20 | Erosion protection shield for a rotating blade |
EP08864232A Not-in-force EP2220342B1 (en) | 2007-12-20 | 2008-11-27 | Erosion protection shield for rotor blades |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07024843A Withdrawn EP2072757A1 (en) | 2007-12-20 | 2007-12-20 | Erosion protection shield for a rotating blade |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100322775A1 (en) |
EP (2) | EP2072757A1 (en) |
JP (1) | JP5064570B2 (en) |
CN (1) | CN101903618B (en) |
PL (1) | PL2220342T3 (en) |
WO (1) | WO2009080439A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2439376A1 (en) * | 2010-10-05 | 2012-04-11 | Siemens Aktiengesellschaft | Shrouded rotor blade for a steam turbine |
ITMI20120779A1 (en) * | 2012-05-08 | 2013-11-09 | Franco Tosi Meccanica S P A | ROTORIAL STAGE OF AXIAL TURBINE WITH AN IMPROVED EROSION PROTECTION |
US9644483B2 (en) * | 2013-03-01 | 2017-05-09 | General Electric Company | Turbomachine bucket having flow interrupter and related turbomachine |
FR3045710B1 (en) * | 2015-12-21 | 2018-01-26 | Safran Aircraft Engines | ATTACK SHIELD |
Family Cites Families (14)
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 (en) * | 1972-08-18 | 1978-06-30 | ||
JPS55100005U (en) * | 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 (en) * | 1990-03-19 | 1991-11-28 | Hitachi Ltd | Turbine moving blade with erosion shield |
JP3313487B2 (en) * | 1993-11-30 | 2002-08-12 | 株式会社東芝 | Steam turbine nozzle |
DE4411679C1 (en) * | 1994-04-05 | 1994-12-01 | Mtu Muenchen Gmbh | Blade of fibre-composite construction having a protective profile |
GB2293631B (en) * | 1994-09-30 | 1998-09-09 | Gen Electric | Composite fan blade trailing edge reinforcement |
JPH08232604A (en) * | 1995-02-27 | 1996-09-10 | Toshiba Corp | Erosion preventing device for steam turbine |
JPH08254104A (en) * | 1995-03-16 | 1996-10-01 | Mitsubishi Heavy Ind Ltd | Moisture removing device in steam turbine |
JP4441836B2 (en) * | 2000-03-03 | 2010-03-31 | 株式会社Ihi | Secondary flow suppression cascade |
JP3950308B2 (en) * | 2001-07-16 | 2007-08-01 | 三菱重工業株式会社 | Moisture removal device in steam turbine |
-
2007
- 2007-12-20 EP EP07024843A patent/EP2072757A1/en not_active Withdrawn
-
2008
- 2008-11-27 US US12/808,418 patent/US20100322775A1/en not_active Abandoned
- 2008-11-27 EP EP08864232A patent/EP2220342B1/en not_active Not-in-force
- 2008-11-27 WO PCT/EP2008/066307 patent/WO2009080439A1/en active Application Filing
- 2008-11-27 JP JP2010538539A patent/JP5064570B2/en not_active Expired - Fee Related
- 2008-11-27 CN CN200880121343.6A patent/CN101903618B/en not_active Expired - Fee Related
- 2008-11-27 PL PL08864232T patent/PL2220342T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN101903618B (en) | 2015-08-05 |
PL2220342T3 (en) | 2013-05-31 |
JP5064570B2 (en) | 2012-10-31 |
CN101903618A (en) | 2010-12-01 |
WO2009080439A1 (en) | 2009-07-02 |
EP2220342A1 (en) | 2010-08-25 |
EP2072757A1 (en) | 2009-06-24 |
JP2011506841A (en) | 2011-03-03 |
US20100322775A1 (en) | 2010-12-23 |
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