EP1008723B1 - Platform cooling in turbomachines - Google Patents

Platform cooling in turbomachines Download PDF

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Publication number
EP1008723B1
EP1008723B1 EP98811219A EP98811219A EP1008723B1 EP 1008723 B1 EP1008723 B1 EP 1008723B1 EP 98811219 A EP98811219 A EP 98811219A EP 98811219 A EP98811219 A EP 98811219A EP 1008723 B1 EP1008723 B1 EP 1008723B1
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EP
European Patent Office
Prior art keywords
platforms
cooling
fluid
platform
channel
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.)
Expired - Lifetime
Application number
EP98811219A
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German (de)
French (fr)
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EP1008723A1 (en
Inventor
Hartmut Hähnle
Kenneth Hall
Sriwickrama Prithiviraj Dr. Harasgama
Konrad Dr. Vogeler
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General Electric Switzerland GmbH
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Alstom Schweiz AG
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Publication date
Application filed by Alstom Schweiz AG filed Critical Alstom Schweiz AG
Priority to EP98811219A priority Critical patent/EP1008723B1/en
Priority to DE59810806T priority patent/DE59810806D1/en
Priority to US09/456,332 priority patent/US6309175B1/en
Publication of EP1008723A1 publication Critical patent/EP1008723A1/en
Application granted granted Critical
Publication of EP1008723B1 publication Critical patent/EP1008723B1/en
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Expired - Lifetime 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
    • F01D5/14Form or construction
    • F01D5/18Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
    • F01D5/187Convection cooling
    • 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
    • F01D11/00Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/005Sealing means between non relatively rotating elements
    • F01D11/006Sealing the gap between rotor blades or blades and rotor
    • 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
    • F01D11/00Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/005Sealing means between non relatively rotating elements
    • F01D11/006Sealing the gap between rotor blades or blades and rotor
    • F01D11/008Sealing the gap between rotor blades or blades and rotor by spacer elements between the blades, e.g. independent interblade platforms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05BINDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00Components
    • F05B2240/80Platforms for stationary or moving blades
    • F05B2240/801Platforms for stationary or moving blades cooled platforms
    • 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 device for cooling of platforms in Turbomachinery, in particular in gas turbines.
  • the efficiency of turbomachines can be increased by increasing the cycle process parameters of the turbomachine.
  • the relevant cycle process parameters are the pressure and the temperature of the fluid.
  • the fluid temperatures which usually occur during the operation of turbomachines today are already well above the permissible material temperatures of the components, in particular in the turbine inlet region.
  • the components forming the flow channel or projecting into the flow channel are directly exposed to the hot fluid flow.
  • the conditional by the heat conduction of the material heat dissipation of the components is generally not sufficient here to avoid over-temperature of the components. Too high material temperatures initially lead to a decrease in the strength values of the material. This often leads to cracking in components.
  • the flow channel of a turbomachine is often constructed of annularly lined-up platforms.
  • the blades of the turbomachine are often arranged on such platforms. In most cases, one bucket is made in one piece with one platform each. In particular, in stators such platforms are also often arranged in the form of a shroud of the blading at the blade tips of the blades. These platforms are thus exposed directly to the hot fluid flow.
  • a temperature profile of the fluid emerging from the combustion chamber, usually air, in the turbine inlet region has traditionally been desired above the channel height.
  • This temperature profile could be achieved via an admixture of cooling fluid in the edge regions of the hot fluid flow in the outlet region of the combustion chamber.
  • the fluid immediately adjacent to the side walls and thus to the platforms therefore had a significantly reduced temperature compared to the temperature of the core flow.
  • an over-temperature of the platforms could be avoided.
  • the invention is based on the object, platforms efficient and reliable to cool.
  • This object is achieved in that at least in one Section along the running between adjacent platforms Parting line a cooling channel is arranged, which as a slot-shaped depression in both adjacent to the parting line side walls of the platforms is executed, and the one along the parting line changing depth of penetration in the respective platform.
  • the cooling fluid guided in the cooling channel has a lower one Temperature on than the adjacent platforms. This is what happens a convective heat transfer between the to the cooling channel adjacent platforms and the cooling fluid and consequently to one Cooling the platforms. It turned out that in this way realized cooling almost independent of fluctuations of the Operating state of the turbomachine is. Furthermore, compared to the other cooling method described above a much smaller Coolant fluid mass flow required to cool the platforms.
  • the cooling channel extends at least in sections approximately parallel to the platform surface. This ensures that a large area of the platform is cooled evenly. It was found that thus a largely uniform Setting temperature distribution in the refrigerated areas of the platform. So-called 'hot spots' in the form of local overheating of the platforms become thereby avoided.
  • the platforms are one-piece or multi-piece with on the platforms arranged blades executed.
  • the platforms can be on the blade foot or be arranged on the blade head of the blades. Form strung together the platforms one or both side walls of the flow channel.
  • the cooling channel approximately centrally between the blades to arrange.
  • Particularly advantageous is the cooling channel with a Shovel profile course executed approximately similar course. It presented It turns out that an over-temperature is common in the peripheral areas and the free areas of the platforms occurs.
  • the free areas of a platform are the areas that in the top view or the bottom view are not one on the Platform arranged shovel to be covered.
  • the cooling channel course has at least one S-beat in such a way, in that at least a part of the cooling fluid guided in the cooling channel is the one Dividing line overflowed.
  • the Cooling channel as a slot-shaped depression in the at the parting line adjacent side walls of the platform and thus not as closed Cooling channel, but is open towards the parting line, the Cooling fluid accordingly also flow into the parting line.
  • the Cooling fluid supplied to the cooling channel in a simple manner via the parting line become.
  • cooling channel is open towards the parting line, it is expedient to use the Cooling channel arranged by means of at least one in the cooling channel Sealing element, preferably a sealing strip inserted in the cooling channel, opposite to a fluid applied to the top of the platforms, in the Usually the hot fluid, seal. As a result, an outflow of the Cooling fluid prevented from the cooling channel.
  • Sealing element preferably a sealing strip inserted in the cooling channel, opposite to a fluid applied to the top of the platforms, in the Usually the hot fluid, seal.
  • an open to the parting line cooling channel is advantageous at least in a section along the parting line in a sealing chamber and a Cooling chamber divided. This subdivision of the cooling channel preferably takes place via a gradation of the channel height.
  • the sealing chamber is to arrange a Sealing element expediently designed with a larger channel height.
  • the Cooling chamber advantageously has a smaller channel height at the same time greater penetration depth.
  • FIG. 1 shows a platform 110 for use in a turbomachine typical embodiment shown in a side view.
  • the hatching was not used here, as usual, for marking cut surfaces, but merely serves to illustrate the presentation.
  • the Platform 110 in one piece with one on the platform arranged blade 120 executed.
  • the platform 110 is in one Arrangement shown with a rotor disc 121 of the turbomachine. This Arrangement corresponds to the typical structure of a bladed Turbine rotor of a turbomachine. Shown is only one of the am Scope of the rotor disc lined up, each with platforms running Blades. Form the platforms strung together on the circumference of the runner in this case, the hub-side side wall of the flow channel of the turbomachine.
  • the hot fluid flow 125 as the main flow of Turbomachine flows in the representation from right to left along the Top of the platform 110. This results in an immediate Heat transfer between the hot fluid 125 and the platform 110.
  • the Temperature of the hot fluid 125 is in this case at least in the full load range of Turbomachine above the maximum permissible material temperature of the platform.
  • a cooling channel 130 arranged.
  • the cooling channel 130 is approximately parallel to that of the hot Fluid flow facing top of the platform 110. According to the Representation is the cooling channel 130 as a slot-shaped depression in the Side wall of the platform 110 executed.
  • Cooling channel 130 is fed here from two reservoirs with cooling fluid.
  • Cooling fluid 126 flows from between the platform and the rotor disk arranged cooling fluid reservoir 155 via an opening 150 in the cooling channel 130.
  • Another way of supplying cooling fluid to the cooling channel 130 results here via the lateral opening 151 of the cooling channel.
  • the feed the cooling channel 130 with cooling fluid 126 is thus here in relation to the Main flow 125 upstream.
  • the outflow is related to the Main flow at the downstream end of the cooling channel instead.
  • the in Figure 1 illustrated cooling channel 130 ends without specially shaped outlet in the Platform 110. The cooling fluid 126 escapes via the parting line.
  • FIG. 2 shows two juxtaposed platforms 210, 210 'in plan view.
  • a blade 220, 220 ' is arranged in each case.
  • a cooling channel 230 is arranged in the side walls of the platforms 210, 210' adjoining the parting line 211 along the parting line 211.
  • the cooling channel 230 consists of slot-shaped recesses in the side walls of both platforms 210, 210 '.
  • the arrangement of the cooling channel 230 was chosen in the illustrated embodiment so that the cooling channel 230 approximately centrally between the blades 220, 220 'extends and in this case has a profile similar to the blade profile.
  • This profile of the cooling channel 230 which is similar to the blade profile, is achieved in that the course of the cooling channel 230 along the parting line 211 has two S-strikes.
  • the sealing chamber 235 here consists of slit-shaped depressions which are arranged in both adjacent to the parting line 211 side walls with approximately the same and along the parting line 211 constant penetration depth. Furthermore, the sealing chamber 235 has a greater channel height compared to the cooling chamber 236. This feature is not apparent due to the representation perspective of Figure 2.
  • the sealing element which is expediently to be arranged in the sealing chamber is not shown. This sealing element seals the cooling channel against the hot fluid flow on the top of the platforms.
  • the cooling chamber 236 is designed in the same way as the sealing chamber 235 as a slot-shaped depression but with a smaller channel height. In contrast to the sealing chamber, the cooling chamber 236, however, as shown in Figure 2, a greater penetration depth in the platforms 210, 210 'a.
  • the feeding of the cooling channel 230 with cooling fluid 226 takes place in relation to the hot fluid flow 225 at the upstream end of the cooling passage 230 via a longitudinal slot 250 from a lower side reservoir.
  • Cooling channel 230 flows from the cooling fluid 226 the cooling channel 230 via a Outlet opening 252 in a downstream, not shown in Figure 2 Component gap.
  • a seal of the cooling channel 330 is shown in FIG. 3 as a section through two Side-by-side platforms 310, 310 'shown.
  • the cooling channel 330 is here from slot-shaped depressions in both to the parting line formed adjacent side walls of the platforms 310, 310 '.
  • the first Platform 310 is again in one piece with one located on the platform Shovel 320 executed.
  • the cooling channel 330 is over a gradation of Channel height in a sealing chamber 335 and a cooling chamber 336 divided.
  • a sealing strip 340 inserted so that he in the Cooling passage 330 flowing cooling fluid to one on the tops of the Platforms adjacent fluid seals.
  • the sealing strip 340 has at its at the rear end, a flange 341 on. This flange 341 serves here Guide the sealing fluid in the overflow of the parting line 311st

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

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Vorrichtung zur Kühlung von Plattformen in Turbomaschinen, insbesondere in Gasturbinen.The invention relates to a device for cooling of platforms in Turbomachinery, in particular in gas turbines.

Stand der TechnikState of the art

Der Wirkungsgrad von Turbomaschinen, insbesondere von Gasturbinen, kann über eine Erhöhung der Kreisprozeßparameter der Turbomaschine erhöht werden. Die relevanten Kreisprozeßparameter sind hierbei der Druck und die Temperatur des Fluids.
Die im Betrieb von Turbomaschinen heutzutage üblicherweise auftretenden Fluidtemperaturen liegen insbesondere im Turbineneintrittsbereich bereits deutlich über den zulässigen Materialtemperaturen der Bauteile. Speziell die den Strömungskanal bildenden oder in den Strömungskanal ragenden Bauteile sind hierbei unmittelbar der heißen Fluidströmung ausgesetzt. Die durch die Wärmeleitung des Werkstoffs bedingte Wärmeabfuhr der Bauteile ist hier in der Regel nicht ausreichend, um eine Übertemperatur der Bauteile zu vermeiden. Zu hohe Materialtemperaturen führen zunächst zu einem Rückgang der Festigkeitswerte des Werkstoffs. Hierbei kommt es oftmals zur Rißbildung in Bauteilen. Im Falles des Überschreitens der Schmelztemperatur des Werkstoffs kommt es darüber hinaus zu einer lokalen oder auch vollständigen Zerstörung des Bauteils. Um diese fatalen Folgen zu vermeiden, ist dafür Sorge zu tragen, daß die Bauteiltemperaturen die maximal zulässigen Materialtemperaturen nicht überschreiten.
Der Strömungskanal einer Turbomaschine ist oftmals aus ringförmig aneinandergereihten Plattformen aufgebaut. Die Schaufeln der Turbomaschine sind häufig auf derartigen Plattformen angeordnet. Zumeist ist je eine Schaufel einteilig mit je einer Plattform ausgeführt. Insbesondere bei Statoren sind derartige Plattformen aber auch oftmals in Form eines Deckbandes der Beschaufelung an den Schaufelspitzen der Schaufeln angeordnet. Diese Plattformen sind somit unmittelbar der heißen Fluidströmung ausgesetzt.
Um die maximal zulässige Materialtemperatur der Plattformen nicht zu überschreiten, wurde bisher üblicherweise über der Kanalhöhe ein Temperaturprofil des aus der Brennkammer austretenden Fluids, meist Luft, im Turbineneintrittsbereich angestrebt. Dieses Temperaturprofil ließ sich über eine Beimischung von Kühlfluid in die Randbereiche der heißen Fluidströmung im Austrittsbereich der Brennkammer erzielen. Das unmittelbar an die Seitenwände und somit an die Plattformen angrenzende Fluid wies daher eine im Vergleich zur Temperatur der Kernströmung deutlich verminderte Temperatur auf. Somit konnte eine Übertemperatur der Plattformen vermieden werden. Als Nachteile dieses Verfahrens ergeben sich hieraus einerseits ein über die Kanalhöhe variierender Energiegehalt der Fluidströmung. Dieser über die Kanalhöhe variierende Energiegehalt der Fluidströmung führt wiederum zu einer uneinheitlichen Energieumsetzung in einem nachfolgenden Rotor und somit zu einer uneinheitlichen Belastung der Beschaufelung über der Kanalhöhe. Als ein weiterer Nachteil dieser Zumischung von Kühlfluid zur Hauptströmung resultiert hieraus eine Verminderung des erzielbaren Wirkungsgrades und somit auch der Leistungsdichte der Turbomaschine. Aus diesen Gründen wird heutzutage ein gleichmäßiges Temperaturprofil über der Kanalhöhe angestrebt. Darüber hinaus werden moderne Brennkammern heutzutage unter dem Aspekt der NOx-Reduktion so ausgelegt, daß keine oder nur eine geringe Beimischung von Sekundärverbrennungsluft mehr erfolgt. Hieraus resultiert ein sehr gleichmäßiges Temperaturprofil über der Kanalhöhe. Dies wiederum führt zu einer Erhöhung der thermischen Belastung der Bauteile, die der Brennkammer nachgeordnet sind, insbesondere der Seitenwände und somit der Plattformen.
Hier wurde bisher versucht, die Plattformen durch Ausblasung eines Kühlfluides zumeist unmittelbar stromauf der Plattformen zu kühlen. Das Kühlfluid soll hierbei einen Kühlfilm auf der Oberseite der Plattformen ausbilden, wodurch es zu einer fluidmechanischen Trennung zwischen dem heißen Fluid und der jeweiligen Plattform kommt. Bei der Lösung gemäss EP 0367984 sind zu diesem Zweck in einer Trennfuge zwischen benachbarten Plattformen schlitzförmige Kanäle zur Verteilung des Kühlfluids angeordnet, welches über Spaltöffnungen in der Streifendichtung zwischen den Plattformen austritt und auf der äusseren Plattformoberfläche einen Kühlfilm bildet. Die Wirkung derartiger Kühlfilme ist aber aufgrund der Durchmischung mit dem Heißgas oftmals räumlich eng begrenzt. Sich ändernde Druckverhältnisse der Heißgasströmung oder auch des Kühlfluids über den Lastbereich einer Turbomaschine führen ebenso zu einem veränderten Kühlfilm. Um eine ausreichende Kühlung zu gewährleisten, ist darüber hinaus ein relativ großer Kühlfluidmassenstrom erforderlich. Dies wiederum führt zu einer Verminderung des Wirkungsgrades der Turbomaschine. Zur Erhöhung der Kühlwirkung wird gemäss US 5281097 angeregt, die von einer Fluidquelle zur Trennfuge führenden Kühlkanäle gekurvt auszubilden, um damit die Wirkung der konvektiven Kühlung auf einen grösseren Flächenbereich auszudehnen und somit eine intensivere und gleichmässigere Kühlung der Plattformen zu erreichen. Nach EP 0866214 verlaufen die vom Kühlfluid beaufschlagten Kühlkanäle vollständig innerhalb der Plattformen und im wesentlichen parallel zu deren Rändern. Diese auf Dampf als Kühlfluid ausgelegte Lösung soll insbesondere die Kühlung der peripheren, thermisch besonders beanspruchten Bereiche der Plattformen verbessern.
The efficiency of turbomachines, in particular gas turbines, can be increased by increasing the cycle process parameters of the turbomachine. The relevant cycle process parameters are the pressure and the temperature of the fluid.
The fluid temperatures which usually occur during the operation of turbomachines today are already well above the permissible material temperatures of the components, in particular in the turbine inlet region. In particular, the components forming the flow channel or projecting into the flow channel are directly exposed to the hot fluid flow. The conditional by the heat conduction of the material heat dissipation of the components is generally not sufficient here to avoid over-temperature of the components. Too high material temperatures initially lead to a decrease in the strength values of the material. This often leads to cracking in components. In the case of exceeding the melting temperature of the material, it also leads to a local or even complete destruction of the component. To avoid these fatal consequences, care must be taken that the component temperatures do not exceed the maximum permissible material temperatures.
The flow channel of a turbomachine is often constructed of annularly lined-up platforms. The blades of the turbomachine are often arranged on such platforms. In most cases, one bucket is made in one piece with one platform each. In particular, in stators such platforms are also often arranged in the form of a shroud of the blading at the blade tips of the blades. These platforms are thus exposed directly to the hot fluid flow.
In order not to exceed the maximum permissible material temperature of the platforms, a temperature profile of the fluid emerging from the combustion chamber, usually air, in the turbine inlet region has traditionally been desired above the channel height. This temperature profile could be achieved via an admixture of cooling fluid in the edge regions of the hot fluid flow in the outlet region of the combustion chamber. The fluid immediately adjacent to the side walls and thus to the platforms therefore had a significantly reduced temperature compared to the temperature of the core flow. Thus, an over-temperature of the platforms could be avoided. As disadvantages of this method, on the one hand, this results in an energy content of the fluid flow that varies over the channel height. This varying over the channel height energy content of the fluid flow in turn leads to a non-uniform energy conversion in a subsequent rotor and thus to a non-uniform loading of the blading above the channel height. As a further disadvantage of this admixture of cooling fluid to the main flow, this results in a reduction of the achievable efficiency and thus also the power density of the turbomachine. For these reasons, a uniform temperature profile over the channel height is nowadays sought. In addition, modern combustion chambers are now designed in terms of NO x reduction so that no or little admixture of secondary combustion occurs more. This results in a very uniform temperature profile above the channel height. This in turn leads to an increase in the thermal load of the components, which are arranged downstream of the combustion chamber, in particular the side walls and thus the platforms.
Here, attempts have been made previously to cool the platforms by blowing out a cooling fluid, usually immediately upstream of the platforms. In this case, the cooling fluid is to form a cooling film on the upper side of the platforms, which leads to a fluid-mechanical separation between the hot fluid and the respective platform. In the solution according to EP 0367984 slot-shaped channels for distributing the cooling fluid are arranged for this purpose in a parting line between adjacent platforms, which exits through gap openings in the strip seal between the platforms and forms a cooling film on the outer platform surface. However, the effect of such cooling films is often limited spatially due to the mixing with the hot gas. Changing pressure conditions of the hot gas flow or the cooling fluid over the load range of a turbomachine also lead to a changed cooling film. In order to ensure sufficient cooling, moreover, a relatively large cooling fluid mass flow is required. This in turn leads to a reduction in the efficiency of the turbomachine. In order to increase the cooling effect, according to US Pat. No. 5,281,097, it is suggested that the cooling channels leading from a fluid source to the parting line be curved in order to expand the effect of the convective cooling to a larger surface area and thus to achieve a more intensive and uniform cooling of the platforms. According to EP 0866214, the cooling channels acted upon by the cooling fluid run completely within the platforms and essentially parallel to their edges. This designed to steam as a cooling fluid solution is intended in particular to improve the cooling of peripheral, thermally stressed areas of the platforms.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, Plattformen effizient und zuverlässig zu kühlen.The invention is based on the object, platforms efficient and reliable to cool.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zumindest in einem Abschnitt längs der zwischen benachbarten Plattformen verlaufenden Trennfuge ein Kühlkanal angeordnet ist, welcher als schlitzförmige Vertiefung in beiden an die Trennfuge angrenzenden Seitenwänden der Plattformen ausgeführt ist, und der eine sich längs der Trennfuge verändernde Eindringtiefe in der jeweiligen Plattform aufweist. This object is achieved in that at least in one Section along the running between adjacent platforms Parting line a cooling channel is arranged, which as a slot-shaped depression in both adjacent to the parting line side walls of the platforms is executed, and the one along the parting line changing depth of penetration in the respective platform.

Zweckmäßig weist das in dem Kühlkanal geführte Kühlfluid eine niedrigere Temperatur auf als die angrenzenden Plattformen. Hierdurch kommt es zu einem konvektiv bedingten Wärmeübergang zwischen den an den Kühlkanal angrenzenden Plattformen und dem Kühlfluid und infolgedessen zu einer Kühlung der Plattformen. Es stellte sich heraus, daß die in dieser Weise realisierte Kühlung nahezu unabhängig von Schwankungen des Betriebszustandes der Turbomaschine ist. Ferner ist im Vergleich zu den anderen, oben beschriebenen Kühlverfahren ein wesentlich kleinerer Kühlfluidmassenstrom zur Kühlung der Plattformen erforderlich.Suitably, the cooling fluid guided in the cooling channel has a lower one Temperature on than the adjacent platforms. This is what happens a convective heat transfer between the to the cooling channel adjacent platforms and the cooling fluid and consequently to one Cooling the platforms. It turned out that in this way realized cooling almost independent of fluctuations of the Operating state of the turbomachine is. Furthermore, compared to the other cooling method described above a much smaller Coolant fluid mass flow required to cool the platforms.

Zweckmäßig verläuft der Kühlkanal zumindest in Teilabschnitten näherungsweise parallel zur Plattformoberfläche. Hierdurch ist sichergestellt, daß ein großer Bereich der Plattform gleichmäßig gekühlt wird. Es wurde gefunden, daß sich somit eine weitestgehend gleichmäßige Temperaturverteilung in den gekühlten Bereichen der Plattform einstellt. Sogenannte 'Hot-Spots' in Form lokaler Überhitzungen der Plattformen werden hierdurch vermieden.Suitably, the cooling channel extends at least in sections approximately parallel to the platform surface. This ensures that a large area of the platform is cooled evenly. It was found that thus a largely uniform Setting temperature distribution in the refrigerated areas of the platform. So-called 'hot spots' in the form of local overheating of the platforms become thereby avoided.

Oftmals sind die Plattformen einteilig oder mehrteilig mit auf den Plattformen angeordneten Schaufeln ausgeführt. Die Plattformen können am Schaufelfuß oder am Schaufelkopf der Schaufeln angeordnet sein. Aneinandergereiht bilden die Plattformen eine oder beide Seitenwände des Strömungskanals. Hierbei ist es vorteilhaft, den Kühlkanal näherungsweise mittig zwischen den Schaufeln anzuordnen. Besonders vorteilhaft ist der Kühlkanal mit einem dem Schaufelprofilverlauf näherungsweise ähnlichen Verlauf ausgeführt. Es stellte sich heraus, daß eine Übertemperatur häufig in den Randbereichen und den freien Bereichen der Plattformen auftritt. Die freien Bereiche einer Plattform sind die Bereiche, die in der Draufsicht oder der Untersicht nicht von einer auf der Plattform angeordneten Schaufel überdeckt werden. Diese besondere Gefährdung der Randbereiche und freien Bereiche hinsichtlich Übertemperatur ist darauf zurückzuführen, daß hier aufgrund geringer Wanddicken der Plattformen eine nur geringe Wärmeabfuhr durch Wärmeleitung in der Plattform selbst stattfindet. Darüber hinaus verlaufen Kühlfluidzuleitungen zur Schaufelkühlung, sofern es sich um eine fluidgekühlte Schaufel handelt, oftmals nur in der Mitte der Plattformen durch die Plattformen in die Schaufeln. Diese Kühlfluidzuleitungen in die Schaufeln führen aber nur in ihrer unmittelbaren Umgebung zu einer Kühlung der jeweiligen Plattform. Die Randbereiche der Plattform verbleiben somit ungekühlt. Es wurde gefunden, daß ein bevorzugt näherungsweise mittig zwischen den Schaufeln angeordneter Kühlkanal hier zu einer optimalen Kühlung insbesondere der Randbereiche der Plattformen führt. Infolge des gekrümmten Profilverlaufs der Schaufeln, ist es darüber hinaus zweckmäßig, den Kühlkanal mit einem näherungsweise dem Schaufelprofilverlauf ähnlichen Verlauf in den Plattformen anzuordnen.Often the platforms are one-piece or multi-piece with on the platforms arranged blades executed. The platforms can be on the blade foot or be arranged on the blade head of the blades. Form strung together the platforms one or both side walls of the flow channel. Here is It is advantageous, the cooling channel approximately centrally between the blades to arrange. Particularly advantageous is the cooling channel with a Shovel profile course executed approximately similar course. It presented It turns out that an over-temperature is common in the peripheral areas and the free areas of the platforms occurs. The free areas of a platform are the areas that in the top view or the bottom view are not one on the Platform arranged shovel to be covered. This particular Endangerment of the edge areas and free areas with regard to overtemperature is due to the fact that here due to small wall thicknesses of Platforms only a small heat dissipation through heat conduction in the platform itself takes place. In addition, cooling fluid supply lines run to Blade cooling, if it is a fluid-cooled blade, often only in the middle of the platforms through the platforms in the blades. This Kühlfluidzuleitungen in the blades but lead only in their immediate Environment to a cooling of the respective platform. The border areas of Platform remain uncooled. It has been found that one preferred Approximately centrally between the blades arranged cooling channel here too optimal cooling in particular the edge regions of the platforms leads. Due to the curved profile of the blades, it is beyond expediently, the cooling channel with an approximately the Shovel profile course similar course in the platforms to arrange.

Vorteilhaft weist der Kühlkanalverlauf zumindest einen S-Schlag dergestalt auf, daß zumindest ein Teil des in dem Kühlkanal geführten Kühlfluids die Trennfuge überströmt. Hierdurch ist es möglich, zumindest Teilbereiche beider Plattformen mit nur einem Kühlkanal zu kühlen. Insbesondere im Falle der Anordnung von Schaufeln auf den Plattformen, ist somit lediglich ein Kühlkanal zur Kühlung der Bereiche zwischen jeweils zwei Schaufeln erforderlich.Advantageously, the cooling channel course has at least one S-beat in such a way, in that at least a part of the cooling fluid guided in the cooling channel is the one Dividing line overflowed. This makes it possible to at least parts of both To cool platforms with only one cooling channel. Especially in the case of Arrangement of blades on the platforms, is thus only a cooling channel to cool the areas between each two blades required.

Indem der Kühlkanal als schlitzförmige Vertiefung in den an die Trennfuge angrenzenden Seitenwänden der Plattform und somit nicht als geschlossener Kühlkanal, sondern gegenüber der Trennfuge hin offen ausgeführt ist, kann das Kühlfluid demgemäß auch in die Trennfuge einströmen. Dies führt vorteilhaft auch zu einer Kühlung der Seitenwände der Trennfuge. Ferner kann das Kühlfluid dem Kühlkanal in einfacher Weise über die Trennfuge zugeführt werden.By the cooling channel as a slot-shaped depression in the at the parting line adjacent side walls of the platform and thus not as closed Cooling channel, but is open towards the parting line, the Cooling fluid accordingly also flow into the parting line. This leads to advantage also to a cooling of the side walls of the parting line. Furthermore, the Cooling fluid supplied to the cooling channel in a simple manner via the parting line become.

Verläuft der Kühlkanal zur Trennfuge hin offen, so ist es zweckmäßig, den Kühlkanal mittels zumindest eines in dem Kühlkanal angeordneten Dichtelements, bevorzugt eines in den Kühlkanal eingelegten Dichtstreifens, gegenüber einem auf der Oberseite der Plattformen anliegenden Fluides, in der Regel dem heißen Fluid, abzudichten. Hierdurch wird ein Ausströmen des Kühlfluides aus dem Kühlkanal verhindert. If the cooling channel is open towards the parting line, it is expedient to use the Cooling channel arranged by means of at least one in the cooling channel Sealing element, preferably a sealing strip inserted in the cooling channel, opposite to a fluid applied to the top of the platforms, in the Usually the hot fluid, seal. As a result, an outflow of the Cooling fluid prevented from the cooling channel.

Ferner ist ein zur Trennfuge hin offener Kühlkanal vorteilhaft zumindest in einem Abschnitt längs der Trennfuge in eine Dichtkammer und eine Kühlkammer unterteilt. Bevorzugt erfolgt diese Unterteilung des Kühlkanals über eine Stufung der Kanalhöhe. Die Dichtkammer ist zur Anordnung eines Dichtelements zweckmäßig mit einer größeren Kanalhöhe ausgeführt. Die Kühlkammer weist hingegen vorteilhaft eine kleinere Kanalhöhe bei gleichzeitig größerer Eindringtiefe auf.Furthermore, an open to the parting line cooling channel is advantageous at least in a section along the parting line in a sealing chamber and a Cooling chamber divided. This subdivision of the cooling channel preferably takes place via a gradation of the channel height. The sealing chamber is to arrange a Sealing element expediently designed with a larger channel height. The Cooling chamber, however, advantageously has a smaller channel height at the same time greater penetration depth.

Zweckmäßig erfolgt die Zuführung des Kühlfluides zum Kühlkanal in Bezug zu einer die Plattformen überströmenden Hauptströmung stromauf, wohingegen der Auslaß zweckmäßig stromab erfolgt. Hierbei kann das Kühlfluid in die Hauptströmung oder aber auch in einen nachgeordneten Spalt entweichen. In einigen Fällen wird es darüber hinaus sinnvoll sein, das Kühlfluid weiterhin zur Kühlung in einem Kühlkanal einzusetzen.Suitably, the supply of the cooling fluid to the cooling channel with respect to a main flow overflowing the platforms upstream, whereas the outlet is expedient downstream. Here, the cooling fluid in the Mainstream or escape into a downstream gap. In In some cases, it will also make sense to continue the cooling fluid for Use cooling in a cooling channel.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

In den Zeichnungen sind Ausführungsbeispiele der Erfindung dargestellt. Die Erfindung ist hierbei aber nicht nur auf diese Ausführungsbeispiele beschränkt, sondern kann auch von diesen Ausführungsbeispielen abweichend realisiert werden.In the drawings, embodiments of the invention are shown. The However, the invention is not limited to these exemplary embodiments, but can also be realized deviating from these embodiments become.

Es zeigen:

Fig. 1
eine Plattform mit einem in der Plattform angeordneten Kühlkanal in der Seitenansicht
Fig. 2
zwei aneinandergereihte Plattformen mit auf den Plattformen angeordneten Schaufeln und einem längs der Trennfuge zwischen den Plattformen angeordneten Kühlkanal in der Draufsicht
Fig. 3
einen Schnitt durch zwei nebeneinander angeordnete Plattformen mit einem in den Plattformen angeordneten Kühlkanal
Show it:
Fig. 1
a platform with a cooling channel arranged in the platform in the side view
Fig. 2
two juxtaposed platforms with arranged on the platforms blades and along the parting line between the platforms arranged cooling channel in plan view
Fig. 3
a section through two juxtaposed platforms with a cooling channel arranged in the platforms

Wege zur Ausführung der ErfindungWays to carry out the invention

In Figur 1 ist eine Plattform 110 in einer für den Einsatz in einer Turbomaschine typischen Ausführung in einer Seitenansicht dargestellt. Die Schraffur wurde hier nicht, wie üblicherweise, zur Kennzeichnung von Schnittflächen verwendet, sondern dient lediglich der Veranschaulichung der Darstellung. Gemäß der Darstellung ist die Plattform 110 hier einteilig mit einer auf der Plattform angeordneten Schaufel 120 ausgeführt. Ferner ist die Plattform 110 in einer Anordnung mit einer Läuferscheibe 121 der Turbomaschine dargestellt. Diese Anordnung entspricht dem typischen Aufbau eines beschaufelten Turbinenrotors einer Turbomaschine. Dargestellt ist jedoch nur eine der am Umfang der Läuferscheibe aufgereihten, jeweils mit Plattformen ausgeführten Schaufeln. Die am Umfang des Läufers aneinandergereihten Plattformen bilden hierbei die nabenseitige Seitenwand des Strömungskanals der Turbomaschine. Zwischen der dargestellten Plattform 110 und der nächsten, unmittelbar angrenzend angeordneten Plattform verläuft eine Trennfuge zwischen den Plattformen. Die heiße Fluidströmung 125 als die Hauptströmung der Turbomaschine strömt in der Darstellung von rechts nach links entlang der Oberseite der Plattform 110. Hierdurch kommt es zu einer unmittelbaren Wärmeübertragung zwischen dem heißen Fluid 125 und der Plattform 110. Die Temperatur des heißen Fluids 125 liegt hierbei zumindest im Volllastbereich der Turbomaschine über der maximal zulässigen Materialtemperatur der Plattform. Um eine Übertemperatur der Plattform 110 zu verhindern, ist in der dargestellten Plattform 110 erfindungsgemäß ein Kühlkanal 130 angeordnet. Der Kühlkanal 130 verläuft näherungsweise parallel zu der der heißen Fluidströmung zugewandten Oberseite der Plattform 110. Gemäß der Darstellung ist der Kühlkanal 130 als schlitzförmige Vertiefung in der Seitenwand der Plattform 110 ausgeführt. Zu berücksichtigen ist hierbei, daß in Figur 1 nur eine der beiden an den Trennspalt angrenzenden Plattformen dargestellt ist. Der vollständige Kühlkanal erstreckt sich jedoch anteilig auf beide Plattformen. Im Folgenden wird zur Vereinfachung der Beschreibung davon ausgegangen, daß sich der Kühlkanal nur in die dargestellte Plattform erstreckt. Über eine Stufung der Kanalhöhe ist der hier dargestellte Kühlkanal 130 in zwei zur Trennfuge hin offene Kammern unterteilt. Die vordere Kammer ist als Dichtkammer 135 mit einer großen Kanalhöhe ausgeführt. Mit einer tieferen Eindringtiefe in die Plattform als die Dichtkammer ist hinter der Dichtkammer ferner eine Kühlkammer 136 angeordnet. Diese Kühlkammer 136 weist eine geringere Kanalhöhe auf als die Dichtkammer 135 und erstreckt sich auch in ihrer Länge auch nur über einen Abschnitt der Dichtkammer 135. Der Kühlkanal 130 wird hier aus zwei Reservoirs mit Kühlfluid gespeist. Einerseits strömt Kühlfluid 126 aus einem zwischen der Plattform und der Läuferscheibe angeordneten Kühlfluidreservoir 155 über eine Öffnung 150 in den Kühlkanal 130. Eine weitere Möglichkeit der Zuführung von Kühlfluid zu dem Kühlkanal 130 ergibt sich hier über die seitliche Öffnung 151 des Kühlkanals. In der zusammengebauten Anordnung der Turbomaschine mündet die seitliche Öffnung 151 des Kühlkanals in den Bauteilspalt zwischen dem Rotor und dem in Bezug zur Hauptströmung 125 stromauf angeordneten Bauteil. Die Speisung des Kühlkanals 130 mit Kühlfluid 126 erfolgt hier somit in Bezug zu der Hauptströmung 125 stromauf. Die Abströmung findet hingegen in Bezug zu der Hauptströmung am stromabwärtigen Ende des Kühlkanals statt. Der in Figur 1 dargestellte Kühlkanal 130 endet ohne speziell ausgeformten Auslaß in der Plattform 110. Das Kühlfluid 126 entweicht über die Trennfuge.FIG. 1 shows a platform 110 for use in a turbomachine typical embodiment shown in a side view. The hatching was not used here, as usual, for marking cut surfaces, but merely serves to illustrate the presentation. According to the Presentation here is the platform 110 in one piece with one on the platform arranged blade 120 executed. Furthermore, the platform 110 is in one Arrangement shown with a rotor disc 121 of the turbomachine. This Arrangement corresponds to the typical structure of a bladed Turbine rotor of a turbomachine. Shown is only one of the am Scope of the rotor disc lined up, each with platforms running Blades. Form the platforms strung together on the circumference of the runner in this case, the hub-side side wall of the flow channel of the turbomachine. Between the illustrated platform 110 and the next, immediately adjacent platform runs a parting line between the Platforms. The hot fluid flow 125 as the main flow of Turbomachine flows in the representation from right to left along the Top of the platform 110. This results in an immediate Heat transfer between the hot fluid 125 and the platform 110. The Temperature of the hot fluid 125 is in this case at least in the full load range of Turbomachine above the maximum permissible material temperature of the platform. To prevent over-temperature of the platform 110 is in the represented platform 110 according to the invention a cooling channel 130 arranged. The cooling channel 130 is approximately parallel to that of the hot Fluid flow facing top of the platform 110. According to the Representation is the cooling channel 130 as a slot-shaped depression in the Side wall of the platform 110 executed. It has to be considered that in Figure 1 only one of the two adjacent to the separation gap platforms is shown. However, the complete cooling channel extends proportionately both platforms. The following is to simplify the description assumed that the cooling channel only in the illustrated platform extends. About a gradation of the channel height is the cooling channel shown here 130 divided into two open to the parting line chambers. The front chamber is designed as a sealing chamber 135 with a large channel height. With a deeper penetration depth into the platform than the sealing chamber is behind the Seal chamber further arranged a cooling chamber 136. This cooling chamber 136 has a smaller channel height than the sealing chamber 135 and extends also in their length only over a portion of the sealing chamber 135th The Cooling channel 130 is fed here from two reservoirs with cooling fluid. On the one hand Cooling fluid 126 flows from between the platform and the rotor disk arranged cooling fluid reservoir 155 via an opening 150 in the cooling channel 130. Another way of supplying cooling fluid to the cooling channel 130 results here via the lateral opening 151 of the cooling channel. In the Assembled arrangement of the turbomachine discharges the lateral Opening 151 of the cooling channel in the component gap between the rotor and the with respect to the main flow 125 upstream component. The feed the cooling channel 130 with cooling fluid 126 is thus here in relation to the Main flow 125 upstream. The outflow, however, is related to the Main flow at the downstream end of the cooling channel instead. The in Figure 1 illustrated cooling channel 130 ends without specially shaped outlet in the Platform 110. The cooling fluid 126 escapes via the parting line.

Figur 2 zeigt zwei nebeneinander angeordnete Plattformen 210, 210' in der Draufsicht. Auf jeder Plattform ist jeweils eine Schaufel 220, 220' angeordnet. Die Plattformen 210, 210' sind ist hierbei jeweils einteilig mit den Schaufeln 220, 220' ausgeführt. Die dreidimensional geformten Schaufeln 220, 220' sind über Schnitte am Schaufelfuß sowie in der Mitteischnittsebene des Strömungskanals als auch in der Draufsicht dargestellt. Ferner sind die Schaufeln 220, 220' hier als gekühlte Turbinenschaufeln ausgeführt. Zwischen den Plattformen 210, 210' verläuft eine Trennfuge 211. Erfindungsgemäß ist in den an die Trennfuge 211 angrenzenden Seitenwänden der Plattformen 210, 210' längs der Trennfuge 211 ein Kühlkanal 230 angeordnet. Der Kühlkanal 230 besteht aus schlitzförmigen Vertiefungen in den Seitenwänden beider Plattformen 210, 210'. Die Anordnung des Kühlkanals 230 wurde in der dargestellten Ausführung so gewählt, daß der Kühlkanal 230 näherungsweise mittig zwischen den Schaufeln 220, 220' verläuft und hierbei einen dem Schaufelprofil ähnlichen Verlauf aufweist. Dieser dem Schaufelprofil ähnliche Verlauf des Kühlkanals 230 wird dadurch erzielt, daß der Verlauf des Kühlkanals 230 längs der Trennfuge 211 zwei S-Schläge aufweist. Diese S-Schläge sind so angeordnet, daß jeweils zumindest ein Teil des in dem Kühlkanal 230 geführten Kühlfluids 226 die Trennfuge 211 überströmt. Infolge des Verlaufs des Kühlkanals 230 entsprechend Figur 2 wird eine optimale Kühlung der Randbereiche und der freien Bereiche der Plattformen 210, 210' erzielt. Die freien Bereiche einer Plattform sind hierbei diejenigen Bereiche, die in der Draufsicht nicht von einer auf der Plattform angeordneten Schaufel überdeckt werden. Der Kühlkanal 230 weist hierzu entsprechend dem zu kühlenden Bereich eine sich längs der Trennfuge 211 verändernde Eindringtiefe in der jeweiligen Plattform 210, 210' auf.
Der in Figur 2 dargestellte Kühlkanal 230 weist zusätzlich eine Unterteilung des Kühlkanals 230 in eine Dichtkammer 235 und eine Kühlkammer 236 auf. Die Dichtkammer 235 besteht hierbei aus schlitzförmigen Vertiefungen, die in beiden an die Trennfuge 211 angrenzenden Seitenwänden mit annähernd gleicher und längs der Trennfuge 211 konstanter Eindringtiefe angeordnet sind. Ferner weist die Dichtkammer 235 im Vergleich zu der Kühlkammer 236 eine größere Kanalhöhe auf. Dieses Merkmal ist aufgrund der Darstellungsperspektive der Figur 2 nicht zu entnehmen. Ebenso ist in Figur 2 das in der Dichtkammer zweckmäßig anzuordnende Dichtelement nicht abgebildet. Dieses Dichtelement dichtet den Kühlkanal gegenüber der heißen Fluidströmung auf der Oberseite der Plattformen ab. Die Kühlkammer 236 ist in gleicher Weise wie die Dichtkammer 235 als schlitzförmige Vertiefung mit jedoch einer kleineren Kanalhöhe ausgeführt. Im Vergleich zur Dichtkammer weist die Kühlkammer 236 hingegen, wie in Figur 2 dargestellt, eine größere Eindringtiefe in die Plattformen 210, 210' ein.
Figure 2 shows two juxtaposed platforms 210, 210 'in plan view. On each platform, a blade 220, 220 'is arranged in each case. The platforms 210, 210 'are in this case in each case in one piece with the blades 220, 220' executed. The three-dimensionally shaped blades 220, 220 'are shown by sections on the blade root and in the Mitteischnittsebene the flow channel as well as in the plan view. Furthermore, the blades 220, 220 'are designed here as cooled turbine blades. Between the platforms 210, 210 'extends a parting line 211. According to the invention, a cooling channel 230 is arranged in the side walls of the platforms 210, 210' adjoining the parting line 211 along the parting line 211. The cooling channel 230 consists of slot-shaped recesses in the side walls of both platforms 210, 210 '. The arrangement of the cooling channel 230 was chosen in the illustrated embodiment so that the cooling channel 230 approximately centrally between the blades 220, 220 'extends and in this case has a profile similar to the blade profile. This profile of the cooling channel 230, which is similar to the blade profile, is achieved in that the course of the cooling channel 230 along the parting line 211 has two S-strikes. These S-blows are arranged so that in each case at least a portion of the guided in the cooling passage 230 cooling fluid 226 flows over the parting line 211. As a result of the course of the cooling channel 230 according to FIG. 2, optimum cooling of the edge regions and of the free regions of the platforms 210, 210 'is achieved. The free areas of a platform are in this case those areas which are not covered in the plan view by a blade arranged on the platform. For this purpose, the cooling channel 230 has, in accordance with the area to be cooled, a penetration depth which changes along the parting line 211 in the respective platform 210, 210 '.
The cooling channel 230 shown in FIG. 2 additionally has a subdivision of the cooling channel 230 into a sealing chamber 235 and a cooling chamber 236. The sealing chamber 235 here consists of slit-shaped depressions which are arranged in both adjacent to the parting line 211 side walls with approximately the same and along the parting line 211 constant penetration depth. Furthermore, the sealing chamber 235 has a greater channel height compared to the cooling chamber 236. This feature is not apparent due to the representation perspective of Figure 2. Likewise, in FIG. 2, the sealing element which is expediently to be arranged in the sealing chamber is not shown. This sealing element seals the cooling channel against the hot fluid flow on the top of the platforms. The cooling chamber 236 is designed in the same way as the sealing chamber 235 as a slot-shaped depression but with a smaller channel height. In contrast to the sealing chamber, the cooling chamber 236, however, as shown in Figure 2, a greater penetration depth in the platforms 210, 210 'a.

Die Speisung des Kühlkanals 230 mit Kühlfluid 226 erfolgt in Bezug zu der heißen Fluidströmung 225 an dem stromaufwärtigen Ende des Kühlkanals 230 über einen Längsschlitz 250 aus einem unterseitigen Reservoir. Am Ende des Kühlkanals 230 entströmt das Kühlfluid 226 dem Kühlkanal 230 über eine Austrittsöffnung 252 in einen nachgeordneten, in Figur 2 nicht dargestellten Bauteilspalt.The feeding of the cooling channel 230 with cooling fluid 226 takes place in relation to the hot fluid flow 225 at the upstream end of the cooling passage 230 via a longitudinal slot 250 from a lower side reservoir. At the end of Cooling channel 230 flows from the cooling fluid 226 the cooling channel 230 via a Outlet opening 252 in a downstream, not shown in Figure 2 Component gap.

Eine Abdichtung des Kühlkanals 330 ist in Figur 3 als Schnitt durch zwei nebeneinander angeordnete Plattformen 310, 310' dargestellt. Der Kühlkanal 330 wird hier aus schlitzförmigen Vertiefungen in beiden an die Trennfuge angrenzenden Seitenwänden der Plattformen 310, 310' gebildet. Die erste Plattform 310 ist wiederum einteilig mit einer auf der Plattform angeordneten Schaufel 320 ausgeführt. Der Kühlkanal 330 ist über eine Stufung der Kanalhöhe in eine Dichtkammer 335 und eine Kühlkammer 336 unterteilt. In die Dichtkammer 335 ist hier ein Dichtstreifen 340 so eingelegt, daß er das in dem Kühlkanal 330 strömende Kühlfluid gegenüber einem auf den Oberseiten der Plattformen anliegenden Fluid abdichtet. Der Dichtstreifen 340 weist an seinem hinteren Ende eine Bördelung 341 auf. Diese Bördelung 341 dient hier der Führung des Dichtfluids bei dem Überströmen der Trennfuge 311.A seal of the cooling channel 330 is shown in FIG. 3 as a section through two Side-by-side platforms 310, 310 'shown. The cooling channel 330 is here from slot-shaped depressions in both to the parting line formed adjacent side walls of the platforms 310, 310 '. The first Platform 310 is again in one piece with one located on the platform Shovel 320 executed. The cooling channel 330 is over a gradation of Channel height in a sealing chamber 335 and a cooling chamber 336 divided. In the Sealing chamber 335 is here a sealing strip 340 inserted so that he in the Cooling passage 330 flowing cooling fluid to one on the tops of the Platforms adjacent fluid seals. The sealing strip 340 has at its at the rear end, a flange 341 on. This flange 341 serves here Guide the sealing fluid in the overflow of the parting line 311st

BezugszeichenlisteLIST OF REFERENCE NUMBERS

110,210,310110,210,310
(erste) Plattform(first) platform
210',310'210 ', 310'
(zweite) Plattform(second) platform
211,311211.311
Trennfugeparting line
120,220,220',320120,220,220 ', 320
Schaufelshovel
121121
Läuferscheiberotor disc
125,225125.225
Strömung des heißen Fluides (Hauptströmung durch die Turbomaschine)Flow of hot fluid (main flow through the Turbomachinery)
126,226126.226
Kühlfluidcooling fluid
130,230,330130,230,330
Kühlkanalcooling channel
135,235,335135,235,335
Dichtkammersealing chamber
136,236,336136,236,336
Kühlkammercooling chamber
340340
Dichtstreifensealing strips
341341
Bördelungflanging
150,151,250150,151,250
Zuströmöffnunginflow
252252
Austrittsöffnungoutlet opening
155155
KühlfluidreservoirCooling fluid reservoir

Claims (5)

  1. Platforms of a turbomachine, in particular a gas turbine, at least two platforms (_10, _10') being arranged next to one another, and a separating gap (_11) running between the platforms (_10, _10'), and, to cool the platforms (_10, _10') by means of a cooling fluid (226), a cooling passage (_30) being arranged at least in one section along the separating gap (_11), this cooling passage (_30) being designed as a slit-like recess in both side walls, adjacent to the separating gap (_11), of the platforms (_10; _10'), characterized in that the cooling passage (_30) has a depth of penetration varying along the separating gap (_11) in the respective platform (_10; _10').
  2. Platforms of a turbomachine according to Claim 1 characterized in that blades (_20, _20') are arranged on the platforms (_10, _10'), and the cooling passage (_30) is arranged approximately centrally between the blades (_20, _20') with a course similar to the blade profile.
  3. Platforms of a turbomachine according to Claim 1 characterized in that the course of the cooling passage (_30) has at least one S-turn designed in such a way that at least some of the cooling fluid (226) directed in the cooling passage (_30) flows over the separating gap (_11).
  4. Platforms of a turbomachine according to Claim 1 characterized in that the cooling passage (_30), by means of at least one sealing strip (340) arranged in the cooling passage (30), is sealed off from a fluid in contact with the top side of the platforms (_10, _10').
  5. Platforms of a turbomachine according to Claim 4, characterized in that the cooling passage (_30), at least in a section along the separating gap (_11), via a graduation of the passage height, is subdivided into a sealing chamber (_35) and a cooling chamber (_36).
EP98811219A 1998-12-10 1998-12-10 Platform cooling in turbomachines Expired - Lifetime EP1008723B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP98811219A EP1008723B1 (en) 1998-12-10 1998-12-10 Platform cooling in turbomachines
DE59810806T DE59810806D1 (en) 1998-12-10 1998-12-10 Platform cooling in turbomachinery
US09/456,332 US6309175B1 (en) 1998-12-10 1999-12-08 Platform cooling in turbomachines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98811219A EP1008723B1 (en) 1998-12-10 1998-12-10 Platform cooling in turbomachines

Publications (2)

Publication Number Publication Date
EP1008723A1 EP1008723A1 (en) 2000-06-14
EP1008723B1 true EP1008723B1 (en) 2004-02-18

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EP98811219A Expired - Lifetime EP1008723B1 (en) 1998-12-10 1998-12-10 Platform cooling in turbomachines

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US (1) US6309175B1 (en)
EP (1) EP1008723B1 (en)
DE (1) DE59810806D1 (en)

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US6309175B1 (en) 2001-10-30
DE59810806D1 (en) 2004-03-25
EP1008723A1 (en) 2000-06-14

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