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EP1892383A1 - Gas turbine blade with cooled platform - Google Patents

Gas turbine blade with cooled platform Download PDF

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Publication number
EP1892383A1
EP1892383A1 EP06017639A EP06017639A EP1892383A1 EP 1892383 A1 EP1892383 A1 EP 1892383A1 EP 06017639 A EP06017639 A EP 06017639A EP 06017639 A EP06017639 A EP 06017639A EP 1892383 A1 EP1892383 A1 EP 1892383A1
Authority
EP
European Patent Office
Prior art keywords
platform
edge
turbine blade
slot
cooling
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Withdrawn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
EP06017639A
Other languages
German (de)
French (fr)
Inventor
Fathi Ahmad
Michael Dr. Dankert
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 EP06017639A priority Critical patent/EP1892383A1/en
Priority to PCT/EP2007/056422 priority patent/WO2008022830A1/en
Publication of EP1892383A1 publication Critical patent/EP1892383A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12Blades
    • F01D5/22Blade-to-blade connections, e.g. for damping vibrations
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01DNON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/08Cooling; Heating; Heat-insulation
    • F01D25/12Cooling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00Components
    • F05D2240/80Platforms for stationary or moving blades
    • F05D2240/81Cooled platforms

Definitions

  • the invention relates to a turbine blade for a particularly stationary gas turbine, having a mounting area adjoined by a platform and an airfoil profile thereon, with a surface that can be acted upon by a hot gas and is delimited by a peripheral platform edge with an end-side edge surface. wherein at least one recess which extends in the direction of the platform edge is provided in the edge surface.
  • Such turbine blades are used in stationary gas turbines. So that they withstand the hot temperatures of the working medium of the gas turbine, the turbine blades are cooled. In addition, penetration of hot working medium into the gap formed by two platforms of adjacent turbine blades is avoided by blowing out cooling air therefrom.
  • the cooling air can be supplied. Due to the prevailing pressure conditions in the turbine, the cooling air exits from this groove and thus prevents the harmful penetration of hot gas into the gap.
  • the cooling air flowing out of the groove cools the edge of the platform beyond the required requirement.
  • the material temperature near the edge of the platform is thus substantially lower than in the areas of the surface of the platform which are remote from the edge of the platform.
  • the occurring temperature gradients and the temperature-dependent material expansions can possibly lead to wear at this point, which occurs in the form of cracking and crack growth.
  • the surface of the platform has a coating to protect against corrosion and heat input has that due to the large material expansions of the platform this coating peels off locally, whereby the protective effect is lost at the affected sites.
  • the object of the invention is therefore to provide a generic turbine blade for a particular stationary gas turbine, which has a particularly long life.
  • a generic turbine blade which has the features of claim 1. It is proposed that at least one of the recesses is designed as a slot which extends into the platform and that the or each slot for cooling the surface of the platform can be flowed through by a coolant in the direction of the platform edge.
  • the material temperature of the platform is lowered in the region remote from the platform edge due to the cooling provided there, compared with a turbine blade known from the prior art.
  • the cooling air absorbs so much heat energy that its cooling effect at the edge of the platform, at which the cooling air leaves the turbine blade, is less intense compared to the turbine blade known from the prior art. Accordingly, the platform edge is no longer needed, but cooled as needed.
  • the material temperature of the platform, near the edge of the platform is no longer unduly lowered.
  • the temperature difference in the platform material between the platform edge and the area remote from the platform edge is adjusted, so that lower material stresses and temperature-related strains occur. Wear in the form of cracks thus occurs less often, or if cracks already exist, their growth will take place more slowly than in a known turbine blade.
  • the turbine blade according to the invention has a prolonged service life compared with the known turbine blade.
  • a sufficient amount of cooling air can be provided for blocking the gap without pressure loss, if in the turbine blade a plurality of slots stacked inside the platform are provided, whose slot openings open in the edge surface of the platform edge. Expediently, the slots have different slot depths, as seen from the edge surface.
  • the or each slot each having a slot opening opposite slot bottom, wherein the supply of coolant in the region of the slot bottom occurs.
  • the planar platform cooling can be done comparatively easily in a convective manner.
  • the temperatures in the area remote from the platform edge are thereby lowered, which leads to a further homogenization of the platform temperatures.
  • the turbine blade when the turbine blade is designed as a blade for a turbine, a particularly long-lived turbine blade can be specified, since usually arranged in the region of the platform edge damper wires represent a further mechanical stress, which, however, does not reduce life due to the inventive design of the turbine blade.
  • a turbine blade 10 is shown in a perspective view.
  • the cast blade has a designated as a blade root attachment region 12, at which a platform 14 and a wing profile 16 adjoins it.
  • a hot working medium flows around the airfoil profile 16 and is also guided by the surface 18 of the platform 14 within an annular, not shown, flow channel.
  • the surface 18 of the platform 14 is bounded by a peripheral platform edge 20.
  • the peripheral platform edge 20 is divided into two mutually parallel longitudinal edges 24 and two transversely extending transverse edges 26.
  • each formed as slots 28 are provided whose slot depth is selected such that they protrude comparatively deep into the platform 14, far away from the platform edge 20.
  • Each slot 28 has a slot opening 32 located in the edge surface 22, the slot base 34 opposite the slot opening 32 being located so deep within the platform 14 that it terminates near the airfoil 16 or even partially below it, as seen radially.
  • a coolant which can flow on the underside of the platform 38 can be supplied to the slot 28, as seen in the radial direction of the turbine blade 10. In this case, the surface 18 exposed to the hot gas of the platform 14 is crust-cooled in places.
  • the coolant flows due to the prevailing pressure gradient to the slot opening 28 and cools the platform 14 convectively.
  • the meanwhile warming coolant locks after the outflow from the slot openings 28 enclosed by two edge surfaces 22 of adjacent turbine blades 10 gap against hot gas intake. Since the coolant has already absorbed heat energy due to the impingement cooling and the subsequent convective planar cooling of the platform 14 toward the slot opening 32, the platform edge 20 of the platform longitudinal edge 24 is cooled less, but still sufficiently cooled, compared to a turbine blade known from the prior art ,
  • the temperatures which are set from the blade center in the direction of the platform edge 20 are thus adjusted in a particularly efficient manner. As a result, less temperature-induced stresses arise in the platform 14, so that cracking is delayed and crack growth slows down compared to a turbine blade known from the prior art.
  • FIG. 3 shows the section through the longitudinal section of the turbine blade according to the invention according to FIG. 1, identical features being provided with the same reference numerals.
  • FIG. 4 shows an alternative embodiment of a turbine blade platform 14 according to the invention, in which a meandering slot 28 is cast. Again, the supply of coolant from the platform base 38, wherein the slot 28 extends in the illustrated example partially below the airfoil 16.
  • the invention provides a turbine blade 10, the life of which is compensated by equalizing the temperatures in the platform 14 in the direction of the airfoil 16 towards the platform edge 20 due to an increase in the cooling air temperature at the slot opening 28 relative to a known turbine blade is. An inadmissibly strong cooling of the platform edge 20 is thus avoided.
  • the life, in particular LCF life (low cycle fatigue life) of the turbine blade 10 according to the invention can be further increased.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

Temperature is homogenized in a platform (14) that runs from a load-bearing vane profiled section (16) towards the platform's edge (20) by using cooling-air temperature at an outlet (10) on the platform's edge. Cooling-air temperature is raised when cooling air is used to cool the whole surface of the platform and when that region of the platform is cooled, which is remote from the platform edge. One slot (28) fits in the platform's edge and extends.

Description

Die Erfindung betrifft eine Turbinenschaufel für eine insbesondere stationäre Gasturbine, mit einem Befestigungsbereich, an dem sich eine Plattform und daran ein Tragflügelprofil anschließt, mit einer an der Plattform angeordneten von einem Heißgas beaufschlagbaren Oberfläche, die von einem umlaufenden Plattformrand mit einer stirnseitigen Randoberfläche begrenzt ist, wobei in der Randoberfläche mindestens eine sich in Richtung des Plattformrands ersteckende Ausnehmung vorgesehen ist.The invention relates to a turbine blade for a particularly stationary gas turbine, having a mounting area adjoined by a platform and an airfoil profile thereon, with a surface that can be acted upon by a hot gas and is delimited by a peripheral platform edge with an end-side edge surface. wherein at least one recess which extends in the direction of the platform edge is provided in the edge surface.

Derartige Turbinenschaufeln werden in stationären Gasturbinen eingesetzt. Damit diese den heißen Temperaturen des Arbeitsmediums der Gasturbine standhalten, sind die Turbinenschaufeln gekühlt. Zudem wird ein Eindringen von heißem Arbeitsmedium in den von zwei Plattformen benachbarter Turbinenlaufschaufeln gebildeten Spalt vermieden, indem aus diesem Kühlluft ausgeblasen wird. Hierzu ist jeweils eine in der Randoberfläche der Plattform angeordnete Nut vorgesehen, der Kühlluft zuführbar ist. Aufgrund der in der Turbine herrschenden Druckverhältnisse tritt aus dieser Nut die Kühlluft aus und verhindert so das schädliche Eindringen von Heißgas in den Spalt.Such turbine blades are used in stationary gas turbines. So that they withstand the hot temperatures of the working medium of the gas turbine, the turbine blades are cooled. In addition, penetration of hot working medium into the gap formed by two platforms of adjacent turbine blades is avoided by blowing out cooling air therefrom. For this purpose, in each case one arranged in the edge surface of the platform groove is provided, the cooling air can be supplied. Due to the prevailing pressure conditions in the turbine, the cooling air exits from this groove and thus prevents the harmful penetration of hot gas into the gap.

Es hat sich jedoch als nachteilig herausgestellt, dass die aus der Nut ausströmende Kühlluft den Plattformrand über den erforderlichen Bedarf hinaus kühlt. Die Materialtemperatur nahe dem Plattformrand ist somit wesentlich geringer als in den Bereichen der Oberfläche der Plattform, welche vom Plattformrand entfernt liegen. Die dabei auftretenden Temperaturgradienten und auch die temperaturabhängigen Materialdehnungen können an dieser Stelle möglicherweise zu Verschleiß führen, welcher in Form von Rissentstehung und Risswachstum auftritt. Des Weiteren kann es der Fall sein, sofern die Oberfläche der Plattform eine Beschichtung zum Schutz vor Korrosion und Wärmeeintrag aufweist, dass diese Beschichtung aufgrund der zu großen Materialdehnungen der Plattform lokal abplatzt, wodurch die Schutzwirkung an den betroffenen Stellen verloren geht.However, it has proved to be disadvantageous that the cooling air flowing out of the groove cools the edge of the platform beyond the required requirement. The material temperature near the edge of the platform is thus substantially lower than in the areas of the surface of the platform which are remote from the edge of the platform. The occurring temperature gradients and the temperature-dependent material expansions can possibly lead to wear at this point, which occurs in the form of cracking and crack growth. Furthermore, it may be the case if the surface of the platform has a coating to protect against corrosion and heat input has that due to the large material expansions of the platform this coating peels off locally, whereby the protective effect is lost at the affected sites.

Aufgabe der Erfindung ist daher die Bereitstellung einer gattungsgemäßen Turbinenschaufel für eine insbesondere stationäre Gasturbine, die eine besonders lange Lebensdauer aufweist.The object of the invention is therefore to provide a generic turbine blade for a particular stationary gas turbine, which has a particularly long life.

Die Aufgabe wird durch die Bereitstellung einer gattungsgemäßen Turbinenschaufel gelöst, welche die Merkmale des Anspruchs 1 aufweist. Es wird vorgeschlagen, dass zumindest eine der Ausnehmung als Schlitz ausgebildet ist, welcher sich in die Plattform hinein erstreckt und dass der oder jeder Schlitz zur Kühlung der Oberfläche der Plattform von einem Kühlmittel in Richtung zum Plattformrand hin durchströmbar ist.The object is achieved by the provision of a generic turbine blade, which has the features of claim 1. It is proposed that at least one of the recesses is designed as a slot which extends into the platform and that the or each slot for cooling the surface of the platform can be flowed through by a coolant in the direction of the platform edge.

Mit der Erfindung wird erreicht, dass die Materialtemperatur der Plattform im vom Plattformrand entfernten Bereich aufgrund der dort vorgesehenen Kühlung abgesenkt wird, verglichen mit einer aus dem Stand der Technik bekannten Turbinenschaufel. Dabei nimmt die Kühlluft so viel Wärmeenergie auf, dass ihre Kühlwirkung am Plattformrand, an der die Kühlluft die Turbinenschaufel verlässt, verglichen mit der aus dem Stand der Technik bekannten Turbinenschaufel, weniger intensiv ist. Dementsprechend wird der Plattformrand nicht mehr über Bedarf, sondern bedarfsgerecht kühlt. Die Materialtemperatur der Plattform, nahe dem Plattformrand wird nicht mehr unzulässig stark abgesenkt. Somit wird die Temperaturdifferenz im Plattformmaterial zwischen dem Plattformrand und dem vom Plattformrand entfernten Bereich angeglichen, so dass geringere Materialspannungen und temperaturbehaftete Dehnungen auftreten. Verschleiß in Form von Rissen tritt somit auch seltener auf, bzw. sofern Risse bereits vorhanden sind, wird deren Wachstum langsamer stattfinden als bei einer bekannten Turbinenschaufel.With the invention it is achieved that the material temperature of the platform is lowered in the region remote from the platform edge due to the cooling provided there, compared with a turbine blade known from the prior art. The cooling air absorbs so much heat energy that its cooling effect at the edge of the platform, at which the cooling air leaves the turbine blade, is less intense compared to the turbine blade known from the prior art. Accordingly, the platform edge is no longer needed, but cooled as needed. The material temperature of the platform, near the edge of the platform is no longer unduly lowered. Thus, the temperature difference in the platform material between the platform edge and the area remote from the platform edge is adjusted, so that lower material stresses and temperature-related strains occur. Wear in the form of cracks thus occurs less often, or if cracks already exist, their growth will take place more slowly than in a known turbine blade.

Folglich weist die erfindungsgemäße Turbinenschaufel eine verlängerte Lebensdauer gegenüber der bekannten Turbinenschaufel auf.Consequently, the turbine blade according to the invention has a prolonged service life compared with the known turbine blade.

Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben.Further advantageous embodiments are specified in the subclaims.

Eine ausreichende Menge an Kühlluft kann für die Sperrung des Spaltes ohne Druckverlust bereitgestellt werden, wenn in der Turbinenschaufel mehrere, innerhalb der Plattform übereinander gestapelte Schlitze vorgesehen sind, deren Schlitzöffnungen in der Randoberfläche des Plattformrandes münden. Zweckmäßigerweise weisen die Schlitze unterschiedliche Schlitztiefen, von der Randoberfläche aus gesehen, auf.A sufficient amount of cooling air can be provided for blocking the gap without pressure loss, if in the turbine blade a plurality of slots stacked inside the platform are provided, whose slot openings open in the edge surface of the platform edge. Expediently, the slots have different slot depths, as seen from the edge surface.

Um eine ausreichende Erwärmung der Kühlluft und gleichzeitig eine ausreichende Kühlung der von dem Plattformrand entfernten Oberfläche der Plattform zu erzielen, weist der oder jeder Schlitz jeweils einen der Schlitzöffnung gegenüberliegenden Schlitzgrund auf, wobei die Zuführung von Kühlmittel im Bereich des Schlitzgrundes erfolgt. Die flächige Plattformkühlung kann in konvektiver Art und Weise vergleichsweise einfach erfolgen. Zudem werden dadurch die Temperaturen im vom Plattformrand entfernten Bereich gesenkt, was zu einer weiteren Vergleichmäßigung der Plattformtemperaturen führt.In order to achieve a sufficient heating of the cooling air and at the same time a sufficient cooling of the platform edge remote from the surface of the platform, the or each slot each having a slot opening opposite slot bottom, wherein the supply of coolant in the region of the slot bottom occurs. The planar platform cooling can be done comparatively easily in a convective manner. In addition, the temperatures in the area remote from the platform edge are thereby lowered, which leads to a further homogenization of the platform temperatures.

Insbesondere, wenn die Turbinenschaufel als Laufschaufel für eine Turbine ausgebildet ist, kann eine besonders langlebige Turbinenschaufel angegeben werden, da üblicherweise im Bereich des Plattformrands angeordnete Dämpferdrähte eine weitere mechanische Belastung darstellen, die sich aufgrund der erfindungsgemäßen Ausgestaltung der Turbinenschaufel jedoch nicht lebensdauerverringernd auswirkt.In particular, when the turbine blade is designed as a blade for a turbine, a particularly long-lived turbine blade can be specified, since usually arranged in the region of the platform edge damper wires represent a further mechanical stress, which, however, does not reduce life due to the inventive design of the turbine blade.

Die Erfindung wird anhand einer Zeichnung erläutert.
Es zeigen:

FIG 1
eine Turbinenlaufschaufel in einer perspektivischen Darstellung,
FIG 2
die Seitenansicht der in FIG 1 dargestellten Turbinenlaufschaufel,
FIG 3
den Längsschnitt durch eine Turbinenlaufschaufelplattform gemäß FIG 1 und
FIG 4
den Längsschnitt durch eine alternative ausgestaltete Turbinenschaufelplattform.
The invention will be explained with reference to a drawing.
Show it:
FIG. 1
a turbine blade in a perspective view,
FIG. 2
3 is a side view of the turbine blade shown in FIG. 1,
FIG. 3
the longitudinal section through a turbine blade platform according to FIG 1 and
FIG. 4
the longitudinal section through an alternative designed turbine blade platform.

In FIG 1 ist eine Turbinenlaufschaufel 10 in perspektivischer Darstellung gezeigt. Die gegossene Laufschaufel weist einen als Laufschaufelfuß bezeichneten Befestigungsbereich 12 auf, an dem sich eine Plattform 14 sowie daran ein Tragflügelprofil 16 anschließt. Während des Betriebes der Gasturbine umströmt ein heißes Arbeitsmedium das Tragflügelprofil 16 und wird dabei auch von der Oberfläche 18 der Plattform 14 innerhalb eines ringförmigen, nicht dargestellten Strömungskanals geführt. Die Oberfläche 18 der Plattform 14 ist von einem umlaufenden Plattformrand 20 begrenzt. Am Plattformrand 20 grenzt eine ebenfalls umlaufende stirnseitige Randoberfläche 22 an. Der umlaufende Plattformrand 20 ist in zwei zueinander parallel verlaufende Längskanten 24 und zwei dazu quer verlaufende Querkanten 26 unterteilbar.1, a turbine blade 10 is shown in a perspective view. The cast blade has a designated as a blade root attachment region 12, at which a platform 14 and a wing profile 16 adjoins it. During operation of the gas turbine, a hot working medium flows around the airfoil profile 16 and is also guided by the surface 18 of the platform 14 within an annular, not shown, flow channel. The surface 18 of the platform 14 is bounded by a peripheral platform edge 20. At the platform edge 20 adjoins a likewise circumferential end-side edge surface 22 at. The peripheral platform edge 20 is divided into two mutually parallel longitudinal edges 24 and two transversely extending transverse edges 26.

In der zur Längskante 24 angrenzenden Randoberfläche 22 sind jeweils als Schlitze 28 ausgebildete Ausnehmungen 30 vorgesehen, deren Schlitztiefe derart gewählt ist, dass sie vergleichsweise tief in die Plattform 14, bis weit vom Plattformrand 20 weg, hineinragen. Jeder Schlitz 28 weist eine in der Randoberfläche 22 befindliche Schlitzöffnung 32 auf, wobei der der Schlitzöffnung 32 gegenüberliegende Schlitzgrund 34 derart tief innerhalb der Plattform 14 liegt, dass dieser nahe dem Tragflügelprofil 16 oder sogar teilweise darunter endet, radial gesehen. Des Weiteren sind, in der Betriebslage der Turbinenschaufel 10 gesehen, in Radialrichtung verlaufende Kanäle in Form von Bohrungen 36 vorgesehen (vgl. FIG 2), durch die ein auf der Plattformunterseite 38 strömbares Kühlmittel dem Schlitz 28 zugeführt werden kann. Dabei wird die dem Heißgas ausgesetzte Oberfläche 18 der Plattform 14 stellenweise prallgekühlt. Nach erfolgter Prallkühlung strömt das Kühlmittel aufgrund des herrschenden Druckgefälles zur Schlitzöffnung 28 hin und kühlt dabei die Plattform 14 konvektiv. Das sich währenddessen erwärmende Kühlmittel sperrt nach dem Ausströmen aus den Schlitzöffnungen 28 den von zwei Randoberflächen 22 benachbarter Turbinenschaufeln 10 eingeschlossenen Spalt gegen Heißgaseinzug. Da das Kühlmittel aufgrund der Prallkühlung und der anschließenden konvektiven flächigen Kühlung der Plattform 14 zum Weg zur Schlitzöffnung 32 hin bereits Wärmeenergie aufgenommen hat, wird der Plattformrand 20 der Plattformlängskante 24 im Vergleich zu einer aus dem Stand der Technik bekannten Turbinenschaufel weniger, aber noch ausreichend gekühlt. Die Temperaturen, welche sich von der Schaufelmitte in Richtung Plattformrand 20 gesehen einstellen, werden somit besonders effizient angeglichen. Dadurch entstehen weniger temperaturbedingte Spannungen in der Plattform 14, so dass Rissentstehung verzögert und Risswachstum verlangsamt abläuft, verglichen mit einer aus dem Stand der Technik bekannten Turbinenschaufel.In the edge surface 22 adjoining the longitudinal edge 24, recesses 30 each formed as slots 28 are provided whose slot depth is selected such that they protrude comparatively deep into the platform 14, far away from the platform edge 20. Each slot 28 has a slot opening 32 located in the edge surface 22, the slot base 34 opposite the slot opening 32 being located so deep within the platform 14 that it terminates near the airfoil 16 or even partially below it, as seen radially. Furthermore, in the operational situation 2, through which a coolant which can flow on the underside of the platform 38 can be supplied to the slot 28, as seen in the radial direction of the turbine blade 10. In this case, the surface 18 exposed to the hot gas of the platform 14 is crust-cooled in places. After the impingement cooling, the coolant flows due to the prevailing pressure gradient to the slot opening 28 and cools the platform 14 convectively. The meanwhile warming coolant locks after the outflow from the slot openings 28 enclosed by two edge surfaces 22 of adjacent turbine blades 10 gap against hot gas intake. Since the coolant has already absorbed heat energy due to the impingement cooling and the subsequent convective planar cooling of the platform 14 toward the slot opening 32, the platform edge 20 of the platform longitudinal edge 24 is cooled less, but still sufficiently cooled, compared to a turbine blade known from the prior art , The temperatures which are set from the blade center in the direction of the platform edge 20 are thus adjusted in a particularly efficient manner. As a result, less temperature-induced stresses arise in the platform 14, so that cracking is delayed and crack growth slows down compared to a turbine blade known from the prior art.

Des Weiteren zeigt FIG 3 den Ausschnitt durch den Längsschnitt der erfindungsgemäßen Turbinenschaufel gemäß FIG 1, wobei identische Merkmale mit gleichen Bezugszeichen versehen sind.Furthermore, FIG. 3 shows the section through the longitudinal section of the turbine blade according to the invention according to FIG. 1, identical features being provided with the same reference numerals.

Daneben zeigt FIG 4 eine alternative Ausgestaltung einer erfindungsgemäßen Turbinenlaufschaufelplattform 14, in der ein mäanderförmiger Schlitz 28 eingegossen ist. Auch hier erfolgt die Zuführung von Kühlmittel von der Plattformunterseite 38, wobei der Schlitz 28 im dargestellten Beispiel teilweise unterhalb des Tragflügelprofils 16 verläuft.In addition, FIG. 4 shows an alternative embodiment of a turbine blade platform 14 according to the invention, in which a meandering slot 28 is cast. Again, the supply of coolant from the platform base 38, wherein the slot 28 extends in the illustrated example partially below the airfoil 16.

Insgesamt wird mit der Erfindung eine Turbinenschaufel 10 angegeben, deren Lebensdauer durch eine vergleichmäßigung der Temperaturen in der Plattform 14 in Richtung vom Tragflügelprofil 16 hin zum Plattformrand 20 aufgrund einer Anhebung der Kühllufttemperatur an der Schlitzöffnung 28, bezogen auf eine bekannte Turbinenschaufel, erfasst wird, verlängert ist. Eine unzulässig starke Kühlung des Plattformrands 20 wird so vermieden. Mit der vorgeschlagenen Maßnahme kann die Lebensdauer, insbesondere auch LCF-Lebensdauer (Low Cycle Fatigue-Lebensdauer) der erfindungsgemäßen Turbinenschaufel 10 weiter erhöht werden.Overall, the invention provides a turbine blade 10, the life of which is compensated by equalizing the temperatures in the platform 14 in the direction of the airfoil 16 towards the platform edge 20 due to an increase in the cooling air temperature at the slot opening 28 relative to a known turbine blade is. An inadmissibly strong cooling of the platform edge 20 is thus avoided. With the proposed measure, the life, in particular LCF life (low cycle fatigue life) of the turbine blade 10 according to the invention can be further increased.

Claims (5)

Turbinenschaufel (10) für eine insbesondere stationäre Gasturbine,
mit einem Befestigungsbereich (12),
an dem sich eine Plattform (14) und daran ein Tragflügelprofil (16) anschließt,
mit einer an der Plattform (14) angeordneten, von einem Heißgas beaufschlagbaren Oberfläche (18),
die von einem umlaufenden Plattformrand (20) mit einer stirnseitigen Randoberfläche (22) begrenzt ist,
wobei in der Randoberfläche (22) mindestens eine sich in Richtung des Plattformrands (20) erstreckende Ausnehmung (30) vorgesehen ist,
dadurch gekennzeichnet, dass
zumindest eine der Ausnehmungen (30) als Schlitz (28) ausgebildet ist,
welcher sich in die Plattform (14) hinein erstreckt und dass der oder jeder Schlitz (28) zur Kühlung der Oberfläche (18) der Plattform (14) von einem Kühlmittel in Richtung zum Plattformrand (20) hin durchströmbar ist.
Turbine blade (10) for a particularly stationary gas turbine,
with a fastening area (12),
on which a platform (14) and a wing profile (16) adjoin,
with a surface (18) which can be acted on by a hot gas and which is arranged on the platform (14),
which is delimited by a circumferential platform edge (20) with an end-face edge surface (22),
wherein in the edge surface (22) at least one in the direction of the platform edge (20) extending recess (30) is provided,
characterized in that
at least one of the recesses (30) is designed as a slot (28),
which extends into the platform (14) and in that the or each slot (28) for cooling the surface (18) of the platform (14) by a coolant in the direction of the platform edge (20) can be flowed through.
Turbinenschaufel (10) nach Anspruch 1,
bei der mehrere innerhalb der Plattform (14) übereinander gestapelte Schlitze (28) vorgesehen sind.
Turbine blade (10) according to claim 1,
in which a plurality of slots (28) stacked one above the other within the platform (14) are provided.
Turbinenschaufel (10) nach Anspruch 2,
bei der die Schlitze (28) unterschiedliche Schlitztiefen, von der Randoberfläche (22) aus gesehen, aufweisen.
Turbine blade (10) according to claim 2,
in which the slots (28) have different slot depths, as seen from the edge surface (22).
Turbinenschaufel (10) nach Anspruch 1, 2 oder 3,
bei der der oder jeder Schlitz (28) jeweils einen einer in der Randoberfläche (22) liegenden Schlitzöffnung (32) gegenüberliegenden Schlitzgrund (24) aufweist,
wobei die Zuführung von Kühlmittel im Bereich des Schlitzgrundes (34) erfolgt.
Turbine blade (10) according to claim 1, 2 or 3,
in which the or each slot (28) in each case has a slot base (24) lying opposite a slot opening (32) lying in the edge surface (22),
wherein the supply of coolant in the region of the slot bottom (34) takes place.
Turbinenschaufel (10) nach Anspruch 1, 2, 3 oder 4, die als Laufschaufel ausgebildet ist.Turbine blade (10) according to claim 1, 2, 3 or 4, which is designed as a blade.
EP06017639A 2006-08-24 2006-08-24 Gas turbine blade with cooled platform Withdrawn EP1892383A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP06017639A EP1892383A1 (en) 2006-08-24 2006-08-24 Gas turbine blade with cooled platform
PCT/EP2007/056422 WO2008022830A1 (en) 2006-08-24 2007-06-27 Gas turbine blade having a cooled platform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06017639A EP1892383A1 (en) 2006-08-24 2006-08-24 Gas turbine blade with cooled platform

Publications (1)

Publication Number Publication Date
EP1892383A1 true EP1892383A1 (en) 2008-02-27

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EP (1) EP1892383A1 (en)
WO (1) WO2008022830A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2264283A3 (en) * 2009-06-15 2015-06-03 Rolls-Royce plc A cooled component for a gas turbine engine
EP2885520A4 (en) * 2012-08-14 2015-08-12 United Technologies Corp Gas turbine engine component having platform trench

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915279A (en) * 1953-07-06 1959-12-01 Napier & Son Ltd Cooling of turbine blades
US3182955A (en) * 1960-10-29 1965-05-11 Ruston & Hornsby Ltd Construction of turbomachinery blade elements
GB2169356A (en) * 1984-12-17 1986-07-09 United Technologies Corp Coolable stator assembly for a gas turbine engine
EP0357984A1 (en) * 1988-08-31 1990-03-14 Westinghouse Electric Corporation Gas turbine with film cooling of turbine vane shrouds
US5639216A (en) * 1994-08-24 1997-06-17 Westinghouse Electric Corporation Gas turbine blade with cooled platform
EP1008723A1 (en) * 1998-12-10 2000-06-14 ABB Alstom Power (Schweiz) AG Platform cooling in turbomachines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915279A (en) * 1953-07-06 1959-12-01 Napier & Son Ltd Cooling of turbine blades
US3182955A (en) * 1960-10-29 1965-05-11 Ruston & Hornsby Ltd Construction of turbomachinery blade elements
GB2169356A (en) * 1984-12-17 1986-07-09 United Technologies Corp Coolable stator assembly for a gas turbine engine
EP0357984A1 (en) * 1988-08-31 1990-03-14 Westinghouse Electric Corporation Gas turbine with film cooling of turbine vane shrouds
US5639216A (en) * 1994-08-24 1997-06-17 Westinghouse Electric Corporation Gas turbine blade with cooled platform
EP1008723A1 (en) * 1998-12-10 2000-06-14 ABB Alstom Power (Schweiz) AG Platform cooling in turbomachines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2264283A3 (en) * 2009-06-15 2015-06-03 Rolls-Royce plc A cooled component for a gas turbine engine
EP2885520A4 (en) * 2012-08-14 2015-08-12 United Technologies Corp Gas turbine engine component having platform trench
US10364680B2 (en) 2012-08-14 2019-07-30 United Technologies Corporation Gas turbine engine component having platform trench

Also Published As

Publication number Publication date
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