EP1251243B1 - Turbine blade with cooling air baffle - Google Patents

Turbine blade with cooling air baffle Download PDF

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Publication number
EP1251243B1
EP1251243B1 EP02290964A EP02290964A EP1251243B1 EP 1251243 B1 EP1251243 B1 EP 1251243B1 EP 02290964 A EP02290964 A EP 02290964A EP 02290964 A EP02290964 A EP 02290964A EP 1251243 B1 EP1251243 B1 EP 1251243B1
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EP
European Patent Office
Prior art keywords
cooling
blade
air
turbine
deflector
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.)
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EP02290964A
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German (de)
French (fr)
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EP1251243A1 (en
EP1251243B8 (en
Inventor
Morgan Lionel Balland
Sylvie Coulon
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Safran Aircraft Engines SAS
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SNECMA Moteurs SA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/18—Hollow blades, i.e. blades with cooling or heating channels or cavities; Heating, heat-insulating or cooling means on blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/08—Heating, heat-insulating or cooling means
    • F01D5/081—Cooling fluid being directed on the side of the rotor disc or at the roots of the blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type

Definitions

  • the present invention relates to a dawn for turbine, the dawn being reported on a disk of the turbine and being cooled by a circulation internal air.
  • An axial turbine stage is composed a vanes grid called distributor and a mobile blade grid called a wheel. It exists monobloc wheels where blades and disc form a unique piece. There are also paddle wheels reported where blades and disk are assembled mechanically, usually by feet of fir.
  • Figure 1A is a partial view of a dawn 1 mounted on a disk 2, the view being represented in a plane perpendicular to the axis of the turbine. It shows more precisely the foot 3 of the dawn 1 in position in a cell 4 of the disk 2. The foot is shown in section along the axis of a channel 5 bringing the air cooling from the bottom of the cell 4 to the internal cooling circuit and not represented from dawn. Cooling air circulates in the cell 4 in a direction perpendicular to the plane of the figure. In the example shown, the air is introduced by one end of the cell, corresponding on one side of the so-called upstream face disc, and goes up in the channel (or channels) 5, the other end of the cell, corresponding to the other side of the disk or downstream face, being closed.
  • the cooling air taken from the compressor output is injected through a flange pressed against the upstream face of the disc for seal the air circuit.
  • the flange is often kept on the disc by a system of hooks called jabots.
  • the hooks also provide another function. They give the cooling air itself directing to the cells a rotational speed equal to that of the rotor of the turbine. Looks like cooling then arrives in front of the cell in turning at the same speed as she and enters at inside the cell without side effects.
  • WO-A-99 47792 discloses a dawn for turbine, the blade having a foot allowing bring it back into a cell of a disk of the turbine.
  • Dawn has an internal circuit of air cooling comprising inlet means of air located on the foot of the dawn and next to the cell, and air outlet means.
  • the foot of the dawn is provided with a device allowing channel the cooling air of the dawn. This device also allows the evacuation of air from cooling after it's passed inside of dawn. The device ensures the separation of the circuits cooling air entering the dawn and coming out of dawn.
  • GB-A-1 605 282 discloses a dawn for turbine, the dawn having a foot allowing to bring it back into a cell of a disk of the turbine.
  • Dawn has an internal circuit of air cooling consisting of channels, comprising air inlet means located on the foot dawn and next to the alveolus, and means of air outlet located at the end of the blade.
  • the foot of the dawn is provided with a cooling tube to bring the cooling air from the suction air manifold to the air inlets.
  • US-A-4 348 157 discloses a dawn for turbine, reported on a disk by means of a foot.
  • Dawn has an internal circuit of air cooling comprising an inlet port air.
  • the air inlet is not located on the foot of dawn and next to the receiving cell of this foot but in the connecting part between the foot and dawn, that is, in the leg.
  • Passages are provided to bring cooling air to the air intakes of the blades. These passages can understand deflectors.
  • US-A-4 178 129 discloses a system cooling turbine blades by circulation air. Each dawn has a foot allowing the bring into a cell a disc of the turbine. Dawn has an internal cooling circuit by air comprising air inlet means located on the foot of dawn. The cooling air is sent either in an air supply chamber of cooling in which the channels of cooling, either directly in the edge channel attacking through a Pitot receiver.
  • incoming cooling air is brought in by a tube-shaped device communicating with the orifices of the cooling channels.
  • the device shaped tube can have size orifices suitable for the openings of the channels or orifices corresponding substantially to the width of the cell. In both cases, one can not avoid the formation of a whirlwind.
  • an air cooling tube is provided adapted to the width of the cell. We can not avoid the formation of a whirlpool.
  • Figure 1B illustrates the phenomenon causing a loss of effectiveness of the blade cooling.
  • This figure is a view of the underside of the foot 3 and bearing the reference 6 in Figure 1A.
  • the channel (or channels) 5 does not have been represented.
  • the flange pressed against the upstream face The disc is shown as 7.
  • Under the reference 8 was figured a flange shutter the cell, side downstream side of the disc.
  • the inventors came to the conclusion that when the air is no longer guided to the cell, the cooling air arrives in the cell with a rotation speed lower than when it is guided. The air is then scooped and whirls in the cell by forming a whirlwind as shown on the Figure 1B.
  • the center of this whirlpool (or vortex) is a very large pressure dip that's detrimental to the dawn feeding in air from cooling.
  • the present invention makes it possible to remedy this problem whenever it comes in a turbine.
  • a turbine blade dawn with a foot to bring it back in a cell of a disk of the turbine, dawn having an internal air cooling circuit comprising air inlet means located on a face of the foot of the dawn and facing said cell, and air outlet means, characterized in that said face of the foot of the dawn is equipped with a deflector comprising at least one fin allowing to channel the cooling air circulating in the bottom of the cell to regulate the flow of air to the air inlet means.
  • the deflector can be an integral part of dawn.
  • the deflector may be a reported element on the foot of dawn and provided with means of access to air inlet means.
  • the means of access may include at least one calibrated hole.
  • the winglet can be straight or inclined by relation to the general axis of dawn.
  • the deflector comprises at least one fin allowing channel cooling air penetrating into the cell and at least one fin allowing channel repressed air towards the center of the cell.
  • Figure 2A is a view of a dawn 11 according to the invention and mounted on a disk 12, the view being represented in a plane perpendicular to the axis of the turbine as for Figure 1A.
  • The: foot 13 of the dawn 11 is in position in a cell 14 of the disk 12.
  • the foot is shown in section along the axis of a canal 15 bringing the cooling air from the bottom of cell 14 to the cooling circuit internal and not represented at dawn.
  • the circulation of the air in the cell is as described previously for Figure 1A.
  • the blade of FIG. 2A is equipped with a deflector 20 secured to the lower face 16 of the dawn foot.
  • the deflector 20 has fins to channel the cooling air circulating in the bottom of the cell 14.
  • Figure 2A shows that the deflector has a hole 21 in correspondence with channel 15 and serving as channel access for cooling air. This hole can be a calibrated hole whose realization is easy to get on a piece such as a baffle reported.
  • FIG 2B corresponding to Figure 1B for the prior art, shows by arrows which way is channeled the cooling air to the bottom of the cell between the flanges 17 and 18 of the disc 12.
  • the deflector is equipped with two fins 22 and 23 located on either side of the axis of alignment of the holes 21.
  • the fins are arranged so as to form a species of chicane.
  • the baffle shown has four holes for the passage of air from cooling.
  • the deflector can be a patch by welding or brazing on the blade root. In a variant, the deflector can be an integral part of dawn.
  • Figure 3 is a perspective view of deflector 20 mentioned above. This figure allows to better see the fins 22 and 23 as well as the holes 21.
  • FIG. 4 is a partial sectional view a turbine equipped with a blade according to the invention.
  • the FIG. 4 shows a blade 11 equipped with a deflector 20 and mounted in a cavity 14 of the disc 12.
  • figure can also see flange 17 plated against the upstream face of the disk 12 and the flange 18 shutter of the cell.
  • the cooling air is taken in chamber background and accelerated through a series injectors such as the injector 31. This air passes then through holes, such as hole 32, pierced on the flask 17 and goes back to the funds of alveoli as indicated by arrows on the Figure 4. In broken lines, the hooks or claws that the invention allows to remove.
  • Figures 5 and 6 show, in position on the underside of a dawn foot, others forms of deflectors usable by this invention.
  • the deflector 40 comprises two fins 41 and 42 present along the entire length of the deflector. Holes 43 for access to the channels of blades are also represented.
  • the deflector 50 comprises a first series of fins 51 and 53, located in a side of the baffle, and a second set of fins 52 and 54, located on the other side of the baffle.
  • the fins are arranged to form baffles. of the 55 holes access to the channels of the vanes are also represented.
  • the deflector may also include one or several fins curved shape and allowing a guiding the cooling air along a path more evolutionary.
  • Figures 7 to 10 give, as examples, other forms of usable deflectors by the present invention. All these views are cross-sectional representations made according to a hole for the passage of cooling air.
  • the deflector 60 of FIG. rail shape It has fins 61 and 62 arranged at right angles to the support face 63 of the deflector on the dawn foot.
  • the fins 61 and 62 can run the full length of the baffle or be interrupted to form baffles.
  • the deflector 70 has fins 71 and 72 which flare in relation to the bearing face 73 of the deflector on the dawn foot.
  • the baffle 80 has fins 81 and 82 which are going to closer to the bearing face 83 of the deflector on the dawn foot.
  • the baffle 90 includes four parallel fins 91, 92, 93 and 94 arranged at right angles to the support face 95 of the deflector on the dawn foot.
  • the invention makes it possible to obtain a gain of static pressure in the center of the cell that fills at about 75% the pressure dip existing without the layout brought.
  • This improvement of dawn feeding in cooling air helps reduce the average temperature of dawn according to the operating conditions and to increase as a result its lifespan.

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

Description

Domaine techniqueTechnical area

La présente invention concerne une aube pour turbine, l'aube étant rapportée sur un disque de la turbine et étant refroidie par une circulation interne d'air.The present invention relates to a dawn for turbine, the dawn being reported on a disk of the turbine and being cooled by a circulation internal air.

Etat de la technique antérieureState of the art

Un étage de turbine axiale est composé d'une grille d'aubes fixes appelée distributeur et d'une grille d'aubes mobiles appelée roue. Il existe des roues monoblocs où aubes et disque forment une pièce unique. Il existe aussi des roues à aubes rapportées où aubes et disque sont assemblés mécaniquement, généralement par pieds de sapin.An axial turbine stage is composed a vanes grid called distributor and a mobile blade grid called a wheel. It exists monobloc wheels where blades and disc form a unique piece. There are also paddle wheels reported where blades and disk are assembled mechanically, usually by feet of fir.

Lorsque les roues fonctionnent sous une température élevée, il est nécessaire de refroidir les aubes. Ce refroidissement peut être effectué par de l'air prélevé par exemple à la sortie du compresseur et acheminé à l'intérieur des aubes à travers leur fixation au disque. L'air de refroidissement pénètre par le pied d'une aube pour ressortir par exemple par l'extrémité opposée et par l'une de ses faces.When the wheels operate under a high temperature, it is necessary to cool the blades. This cooling can be done by the air taken for example at the compressor outlet and routed inside the blades through their attachment to the disc. Cooling air enters by the foot of a dawn to stand out for example by the opposite end and by one of its faces.

La figure 1A est une vue partielle d'une aube 1 montée sur un disque 2, la vue étant représentée dans un plan perpendiculaire à l'axe de la turbine. Elle montre plus précisément le pied 3 de l'aube 1 en position dans une alvéole 4 du disque 2. Le pied est montré en coupe selon l'axe d'un canal 5 amenant l'air de refroidissement depuis le fond de l'alvéole 4 jusqu'au circuit de refroidissement interne et non représenté de l'aube. L'air de refroidissement circule dans l'alvéole 4 dans une direction perpendiculaire au plan de la figure. Dans l'exemple représenté, l'air est introduit par une extrémité de l'alvéole, correspondant à une face du disque dite face amont, et remonte dans le canal (ou les canaux) 5, l'autre extrémité de l'alvéole, correspondant à l'autre face du disque ou face aval, étant obturée.Figure 1A is a partial view of a dawn 1 mounted on a disk 2, the view being represented in a plane perpendicular to the axis of the turbine. It shows more precisely the foot 3 of the dawn 1 in position in a cell 4 of the disk 2. The foot is shown in section along the axis of a channel 5 bringing the air cooling from the bottom of the cell 4 to the internal cooling circuit and not represented from dawn. Cooling air circulates in the cell 4 in a direction perpendicular to the plane of the figure. In the example shown, the air is introduced by one end of the cell, corresponding on one side of the so-called upstream face disc, and goes up in the channel (or channels) 5, the other end of the cell, corresponding to the other side of the disk or downstream face, being closed.

L'air de refroidissement prélevé à la sortie du compresseur est injecté au travers d'un flasque plaqué contre la face amont du disque pour assurer l'étanchéité du circuit d'air. Pour ce faire, le flasque est souvent maintenu sur le disque par un système de crochets appelés crabots.The cooling air taken from the compressor output is injected through a flange pressed against the upstream face of the disc for seal the air circuit. To do this, the flange is often kept on the disc by a system of hooks called jabots.

Les crochets assurent également une autre fonction. Ils donnent à l'air de refroidissement se dirigeant vers les alvéoles une vitesse de rotation égale à celle du rotor de la turbine. L'air de refroidissement arrive alors devant l'alvéole en tournant à la même vitesse qu'elle et entre à l'intérieur de l'alvéole sans effets secondaires.The hooks also provide another function. They give the cooling air itself directing to the cells a rotational speed equal to that of the rotor of the turbine. Looks like cooling then arrives in front of the cell in turning at the same speed as she and enters at inside the cell without side effects.

Ces crochets ont cependant l'inconvénient d'être coûteux et d'avoir une relativement faible durée de vie. Il serait donc intéressant de pouvoir les supprimer. Cependant, des essais ont montré que le refroidissement des aubes de turbines est moins assuré lorsque ces crochets sont supprimés. These hooks, however, have the disadvantage to be expensive and to have a relatively short duration of life. It would be interesting to be able to remove. However, tests have shown that the Turbine blade cooling is less assured when these brackets are removed.

Le document WO-A-99 47792 divulgue une aube pour turbine, l'aube présentant un pied permettant de la rapporter dans une alvéole d'un disque de la turbine. L'aube possède un circuit interne de refroidissement par air comprenant des moyens d'entrée d'air situés sur le pied de l'aube et en regard de l'alvéole, et des moyens de sortie d'air. Le pied de l'aube est pourvu d'un dispositif permettant de canaliser l'air de refroidissement de l'aube. Ce dispositif permet également l'évacuation de l'air de refroidissement après son passage à l'intérieur de l'aube. Le dispositif assure la séparation des circuits d'air de refroidissement entrant dans l'aube et sortant de l'aube.WO-A-99 47792 discloses a dawn for turbine, the blade having a foot allowing bring it back into a cell of a disk of the turbine. Dawn has an internal circuit of air cooling comprising inlet means of air located on the foot of the dawn and next to the cell, and air outlet means. The foot of the dawn is provided with a device allowing channel the cooling air of the dawn. This device also allows the evacuation of air from cooling after it's passed inside of dawn. The device ensures the separation of the circuits cooling air entering the dawn and coming out of dawn.

Le document GB-A-1 605 282 divulgue une aube pour turbine, l'aube présentant un pied permettant de la rapporter dans une alvéole d'un disque de la turbine. L'aube possède un circuit interne de refroidissement par air constitué par des canaux, comprenant des moyens d'entrée d'air situés sur le pied de l'aube et en regard de l'alvéole, et des moyens de sortie d'air situés en extrémité d'aube. Le pied de l'aube est pourvu d'un tube de refroidissement permettant d'amener l'air de refroidissement depuis le collecteur d'air d'aspiration jusqu'aux entrées d'air.GB-A-1 605 282 discloses a dawn for turbine, the dawn having a foot allowing to bring it back into a cell of a disk of the turbine. Dawn has an internal circuit of air cooling consisting of channels, comprising air inlet means located on the foot dawn and next to the alveolus, and means of air outlet located at the end of the blade. The foot of the dawn is provided with a cooling tube to bring the cooling air from the suction air manifold to the air inlets.

Le document US-A-4 348 157 divulgue une aube pour turbine, rapportée sur un disque au moyen d'un pied. L'aube possède un circuit interne de refroidissement par air comprenant un orifice d'entrée d'air. L'orifice d'entrée d'air n'est pas situé sur le pied de l'aube et en regard de l'alvéole de réception de ce pied mais dans la partie de liaison entre le pied et l'aube, c'est-à-dire dans la jambe. Des passages sont prévus pour amener l'air de refroidissement jusqu'aux entrées d'air des aubes. Ces passages peuvent comprendre des déflecteurs.US-A-4 348 157 discloses a dawn for turbine, reported on a disk by means of a foot. Dawn has an internal circuit of air cooling comprising an inlet port air. The air inlet is not located on the foot of dawn and next to the receiving cell of this foot but in the connecting part between the foot and dawn, that is, in the leg. Passages are provided to bring cooling air to the air intakes of the blades. These passages can understand deflectors.

Le document US-A-4 178 129 divulgue un système de refroidissement d'aubes de turbine par circulation d'air. Chaque aube présente un pied permettant de la rapporter dans une alvéole d'un disque de la turbine. L'aube possède un circuit interne de refroidissement par air comprenant des moyens d'entrée d'air situés sur le pied de l'aube. L'air de refroidissement est envoyé soit dans une chambre d'alimentation en air de refroidissement dans laquelle débouche les canaux de refroidissement, soit directement dans le canal de bord d'attaque par l'intermédiaire d'un receveur de Pitot.US-A-4 178 129 discloses a system cooling turbine blades by circulation air. Each dawn has a foot allowing the bring into a cell a disc of the turbine. Dawn has an internal cooling circuit by air comprising air inlet means located on the foot of dawn. The cooling air is sent either in an air supply chamber of cooling in which the channels of cooling, either directly in the edge channel attacking through a Pitot receiver.

Concernant le document WO-A-99 47792 cité ci-dessus, l'air de refroidissement arrivant est amené par un dispositif en forme de tube communiquant avec les orifices des canaux de refroidissement. Le dispositif en forme de tube peut avoir des orifices de taille adaptée aux orifices des canaux ou des orifices correspondant pratiquement à la largeur de l'alvéole. Dans les deux cas, on ne peut éviter la formation d'un tourbillon.Regarding the document WO-A-99 47792 cited above, incoming cooling air is brought in by a tube-shaped device communicating with the orifices of the cooling channels. The device shaped tube can have size orifices suitable for the openings of the channels or orifices corresponding substantially to the width of the cell. In both cases, one can not avoid the formation of a whirlwind.

Concernant le document GB-A-1 605 282 cité ci-dessus, il est prévu un tube de refroidissement d'air adapté à la largeur de l'alvéole. On ne peut donc éviter la formation d'un tourbillon. With regard to GB-A-1 605 282 cited above, an air cooling tube is provided adapted to the width of the cell. We can not avoid the formation of a whirlpool.

Concernant le document US-A-4 348 157 cité ci-dessus, l'air arrive directement sur une face percée d'un trou, ce qui conduit à la même conclusion.Regarding the document US-A-4 348 157 cited above, the air comes directly to a pierced face of a hole, which leads to the same conclusion.

Concernant le document US-A-4 178 129 cité ci-dessus, l'air arrive soit directement dans un trou (par un receveur de Pitot), soit directement sur une face percée de trous, ce qui conduit à la même conclusion.Regarding the document US-A-4 178 129 cited above, the air arrives either directly into a hole (by Pitot receiver), either directly on one side pierced with holes, which leads to the same conclusion.

Exposé de l'inventionPresentation of the invention

Il revient aux inventeurs de la présente invention d'avoir découvert la raison d'une moins grande efficacité du refroidissement lorsque les crochets ou crabots sont supprimés et d'avoir apporté une solution à ce problème.It is up to the inventors of this invention to have discovered the reason for a less high cooling efficiency when hooks or claws are removed and to have brought a solution to this problem.

La figure 1B permet d'illustrer le phénomène provoquant une perte d'efficacité du refroidissement des aubes. Cette figure est une vue de la face inférieure du pied 3 et portant la référence 6 sur la figure 1A. Le canal (ou les canaux) 5 n'a pas été représenté. Le flasque plaqué contre la face amont du disque est figuré sous la référence 7. Sous la référence 8 a été figuré un flasque d'obturation de l'alvéole, côté face aval du disque.Figure 1B illustrates the phenomenon causing a loss of effectiveness of the blade cooling. This figure is a view of the underside of the foot 3 and bearing the reference 6 in Figure 1A. The channel (or channels) 5 does not have been represented. The flange pressed against the upstream face The disc is shown as 7. Under the reference 8 was figured a flange shutter the cell, side downstream side of the disc.

Les inventeurs sont arrivés à la conclusion que, quand l'air n'est plus guidé jusqu'à l'alvéole, l'air de refroidissement arrive dans l'alvéole avec une vitesse de rotation plus faible que lorsqu'il est guidé. L'air est alors écopé et tournoie dans l'alvéole en formant un tourbillon comme cela est figuré sur la figure 1B. Le centre de ce tourbillon (ou vortex) est un creux de pression très important qui est préjudiciable pour l'alimentation de l'aube en air de refroidissement.The inventors came to the conclusion that when the air is no longer guided to the cell, the cooling air arrives in the cell with a rotation speed lower than when it is guided. The air is then scooped and whirls in the cell by forming a whirlwind as shown on the Figure 1B. The center of this whirlpool (or vortex) is a very large pressure dip that's detrimental to the dawn feeding in air from cooling.

La présente invention permet de remédier à ce problème chaque fois qu'il se présente dans une turbine.The present invention makes it possible to remedy this problem whenever it comes in a turbine.

Elle a pour objet une aube pour turbine, l'aube présentant un pied permettant de la rapporter dans une alvéole d'un disque de la turbine, l'aube possédant un circuit interne de refroidissement par air comprenant des moyens d'entrée d'air situés sur une face du pied de l'aube et en regard de ladite alvéole, et des moyens de sortie d'air, caractérisée en ce que ladite face du pied de l'aube est équipée d'un déflecteur comportant au moins une ailette permettant de canaliser l'air de refroidissement circulant dans le fond de l'alvéole pour régulariser l'écoulement d'air vers les moyens d'entrée d'air.Its purpose is a turbine blade, dawn with a foot to bring it back in a cell of a disk of the turbine, dawn having an internal air cooling circuit comprising air inlet means located on a face of the foot of the dawn and facing said cell, and air outlet means, characterized in that said face of the foot of the dawn is equipped with a deflector comprising at least one fin allowing to channel the cooling air circulating in the bottom of the cell to regulate the flow of air to the air inlet means.

La présence d'un tel déflecteur sur la face du pied de l'aube où sont situés les moyens d'entrée d'air permet d'éviter la formation d'un tourbillon.The presence of such a deflector on the face from the foot of the dawn where are the means of entry of air prevents the formation of a vortex.

Le déflecteur peut faire partie intégrante de l'aube.The deflector can be an integral part of dawn.

Le déflecteur peut être un élément rapporté sur le pied de l'aube et pourvu de moyens d'accès aux moyens d'entrée d'air. Les moyens d'accès peuvent comprendre au moins un trou calibré.The deflector may be a reported element on the foot of dawn and provided with means of access to air inlet means. The means of access may include at least one calibrated hole.

L'ailette peut être droite ou inclinée par rapport à l'axe général de l'aube.The winglet can be straight or inclined by relation to the general axis of dawn.

Selon un mode de réalisation avantageux, le déflecteur comprend au moins une ailette permettant de canaliser l'air de refroidissement pénétrant dans l'alvéole et au moins une ailette permettant de canaliser de l'air refoulé vers le centre de l'alvéole.According to an advantageous embodiment, the deflector comprises at least one fin allowing channel cooling air penetrating into the cell and at least one fin allowing channel repressed air towards the center of the cell.

Brève description des dessinsBrief description of the drawings

L'invention sera mieux comprise et d'autres avantages et particularités apparaítront à la lecture de la description qui va suivre, donnée à titre d'exemple non limitatif, accompagnée des dessins annexés parmi lesquels :

  • la figure 1A, déjà décrite, est une vue partielle d'une aube pour turbine, montée sur un disque, selon l'art connu,
  • la figure 1B, déjà décrite, est une vue de la face inférieure d'un pied d'aube pour turbine, selon l'art connu,
  • la figure 2A est une vue d'une aube pour turbine, montée sur un disque, selon l'invention,
  • la figure 2B est une vue de la face inférieure d'un pied d'aube pour turbine, selon l'invention,
  • la figure 3 est une vue en perspective d'un déflecteur utilisé par la présente invention,
  • la figure 4 est une vue partielle en coupe d'une turbine équipée d'une aube selon l'invention,
  • les figures 5 et 6 sont des vues de dessous de déflecteurs utilisables par la présente invention,
  • les figures 7 à 10 sont des vues transversales et en coupe de différents déflecteurs utilisables par la présente invention.
The invention will be better understood and other advantages and particularities will appear on reading the following description, given by way of non-limiting example, accompanied by the appended drawings among which:
  • FIG. 1A, already described, is a partial view of a turbine blade, mounted on a disk, according to the known art,
  • FIG. 1B, already described, is a view of the lower face of a turbine blade root, according to the prior art,
  • FIG. 2A is a view of a turbine blade, mounted on a disk, according to the invention,
  • FIG. 2B is a view of the lower face of a turbine blade root, according to the invention,
  • FIG. 3 is a perspective view of a deflector used by the present invention,
  • FIG. 4 is a partial sectional view of a turbine equipped with a blade according to the invention,
  • FIGS. 5 and 6 are bottom views of baffles that can be used by the present invention,
  • Figures 7 to 10 are cross sectional views and different deflectors used by the present invention.

Description détaillée de modes de réalisation de l'inventionDetailed description of embodiments of the invention

La figure 2A est une vue d'une aube 11 selon l'invention et montée sur un disque 12, la vue étant représentée dans un plan perpendiculaire à l'axe de la turbine comme pour la figure 1A. Le : pied 13 de l'aube 11 est en position dans une alvéole 14 du disque 12. Le pied est montré en coupe selon l'axe d'un canal 15 amenant l'air de refroidissement depuis le fond de l'alvéole 14 jusqu'au circuit de refroidissement interne et non représenté de l'aube. La circulation de l'air dans l'alvéole se fait comme cela est décrit précédemment pour la figure1A.Figure 2A is a view of a dawn 11 according to the invention and mounted on a disk 12, the view being represented in a plane perpendicular to the axis of the turbine as for Figure 1A. The: foot 13 of the dawn 11 is in position in a cell 14 of the disk 12. The foot is shown in section along the axis of a canal 15 bringing the cooling air from the bottom of cell 14 to the cooling circuit internal and not represented at dawn. The circulation of the air in the cell is as described previously for Figure 1A.

A la différence de l'aube décrite dans la figure1A, l'aube de la figure 2A est équipée d'un déflecteur 20 solidaire de la face inférieure 16 du pied d'aube. Le déflecteur 20 comporte des ailettes permettant de canaliser l'air de refroidissement circulant dans le fond de l'alvéole 14. La figure 2A montre que le déflecteur présente un trou 21 en correspondance avec le canal 15 et servant de moyens d'accès au canal pour l'air de refroidissement. Ce trou peut être un trou calibré dont la réalisation est aisée à obtenir sur une pièce telle qu'un déflecteur rapporté.Unlike the dawn described in the FIG. 1A, the blade of FIG. 2A is equipped with a deflector 20 secured to the lower face 16 of the dawn foot. The deflector 20 has fins to channel the cooling air circulating in the bottom of the cell 14. Figure 2A shows that the deflector has a hole 21 in correspondence with channel 15 and serving as channel access for cooling air. This hole can be a calibrated hole whose realization is easy to get on a piece such as a baffle reported.

La figure 2B, correspondant à la figure 1B pour l'art antérieur, montre par des flèches de quelle manière est canalisé l'air de refroidissement au fond de l'alvéole, entre les flasques 17 et 18 du disque 12. Sur cette figure, le déflecteur est équipé de deux ailettes 22 et 23 situées de part et d'autre de l'axe d'alignement des trous 21. Les ailettes sont agencées de façon à former une espèce de chicane. On peut remarquer également que le déflecteur représenté possède quatre trous pour le passage de l'air de refroidissement.Figure 2B, corresponding to Figure 1B for the prior art, shows by arrows which way is channeled the cooling air to the bottom of the cell between the flanges 17 and 18 of the disc 12. In this figure, the deflector is equipped with two fins 22 and 23 located on either side of the axis of alignment of the holes 21. The fins are arranged so as to form a species of chicane. We can also note that the baffle shown has four holes for the passage of air from cooling.

La présence d'un déflecteur en face inférieure du pied de l'aube permet d'éviter la formation d'un tourbillon et la manifestation d'un creux de pression.The presence of a deflector in front bottom of the dawn foot avoids the formation of a whirlwind and the manifestation of a hollow pressure.

Le déflecteur peut être une pièce rapportée par soudage ou brasage sur le pied d'aube. En variante, le déflecteur peut faire partie intégrante de l'aube.The deflector can be a patch by welding or brazing on the blade root. In a variant, the deflector can be an integral part of dawn.

La figure 3 est une vue en perspective du déflecteur 20 mentionné précédemment. Cette figure permet de mieux voir les ailettes 22 et 23 ainsi que les trous 21.Figure 3 is a perspective view of deflector 20 mentioned above. This figure allows to better see the fins 22 and 23 as well as the holes 21.

La figure 4 est une vue partielle en coupe d'une turbine équipée d'une aube selon l'invention. La figure 4 montre une aube 11 équipée d'un déflecteur 20 et montée dans une alvéole 14 du disque 12. Cette figure permet de voir également le flasque 17 plaqué contre la face amont du disque 12 et le flasque 18 d'obturation de l'alvéole.Figure 4 is a partial sectional view a turbine equipped with a blade according to the invention. The FIG. 4 shows a blade 11 equipped with a deflector 20 and mounted in a cavity 14 of the disc 12. figure can also see flange 17 plated against the upstream face of the disk 12 and the flange 18 shutter of the cell.

L'air de refroidissement est prélevé en fond de chambre et accéléré à travers une série d'injecteurs tel que l'injecteur 31. Cet air passe ensuite au travers de trous, tels que le trou 32, percés sur le flasque 17 et remonte vers les fonds des alvéoles comme cela est indiqué par des flèches sur la figure 4. En traits interrompus, on a représenté les crochets ou crabots que l'invention permet de supprimer.The cooling air is taken in chamber background and accelerated through a series injectors such as the injector 31. This air passes then through holes, such as hole 32, pierced on the flask 17 and goes back to the funds of alveoli as indicated by arrows on the Figure 4. In broken lines, the hooks or claws that the invention allows to remove.

Les figures 5 et 6 montrent, en position sur la face inférieure d'un pied d'aube, d'autres formes de déflecteurs utilisables par la présente invention.Figures 5 and 6 show, in position on the underside of a dawn foot, others forms of deflectors usable by this invention.

Sur la figure 5, le déflecteur 40 comporte deux ailettes 41 et 42 présentes sur toute la longueur du déflecteur. Des trous 43 d'accès aux canaux des aubes sont également représentés.In FIG. 5, the deflector 40 comprises two fins 41 and 42 present along the entire length of the deflector. Holes 43 for access to the channels of blades are also represented.

Sur la figure 6, le déflecteur 50 comporte une première série d'ailettes 51 et 53, situées d'un côté du déflecteur, et une deuxième série d'ailettes 52 et 54, situées de l'autre côté du déflecteur. Les ailettes sont agencées pour former des chicanes. Des trous 55 d'accès aux canaux des aubes sont également représentés.In FIG. 6, the deflector 50 comprises a first series of fins 51 and 53, located in a side of the baffle, and a second set of fins 52 and 54, located on the other side of the baffle. The fins are arranged to form baffles. of the 55 holes access to the channels of the vanes are also represented.

Le déflecteur peut aussi comporter une ou plusieurs ailettes de forme incurvée et permettant un guidage de l'air de refroidissement selon un trajet plus évolutif.The deflector may also include one or several fins curved shape and allowing a guiding the cooling air along a path more evolutionary.

Les figures 7 à 10 donnent, à titre d'exemples, d'autres formes de déflecteurs utilisables par la présente invention. Toutes ces vues sont des représentations en coupe transversale effectuée selon un trou de passage de l'air de refroidissement.Figures 7 to 10 give, as examples, other forms of usable deflectors by the present invention. All these views are cross-sectional representations made according to a hole for the passage of cooling air.

Le déflecteur 60 de la figure 7 est en forme de rail. Il comporte des ailettes 61 et 62 disposées à angle droit par rapport à la face d'appui 63 du déflecteur sur le pied d'aube. Les ailettes 61 et 62 peuvent courir toute la longueur du déflecteur ou être interrompues pour former des chicanes.The deflector 60 of FIG. rail shape. It has fins 61 and 62 arranged at right angles to the support face 63 of the deflector on the dawn foot. The fins 61 and 62 can run the full length of the baffle or be interrupted to form baffles.

Il en va de même pour les déflecteurs 70, 80 et 90 représentés respectivement aux figures 8, 9 et 10. Le déflecteur 70 comporte des ailettes 71 et 72 qui vont en s'évasant par rapport à la face d'appui 73 du déflecteur sur le pied d'aube. Le déflecteur 80 comporte des ailettes 81 et 82 qui vont en se rapprochant par rapport à la face d'appui 83 du déflecteur sur le pied d'aube. Le déflecteur 90 comprend quatre ailettes parallèles 91, 92, 93 et 94 disposées à angle droit par rapport à la face d'appui 95 du déflecteur sur le pied d'aube.It is the same for the deflectors 70, 80 and 90 respectively shown in FIGS. 8, 9 and 10. The deflector 70 has fins 71 and 72 which flare in relation to the bearing face 73 of the deflector on the dawn foot. The baffle 80 has fins 81 and 82 which are going to closer to the bearing face 83 of the deflector on the dawn foot. The baffle 90 includes four parallel fins 91, 92, 93 and 94 arranged at right angles to the support face 95 of the deflector on the dawn foot.

L'invention permet d'obtenir un gain de pression statique au centre de l'alvéole qui comble à environ 75% le creux de pression existant sans l'aménagement apporté. Cette amélioration de l'alimentation de l'aube en air de refroidissement permet de réduire la température moyenne de l'aube suivant les conditions de fonctionnement et d'augmenter en conséquence sa durée de vie.The invention makes it possible to obtain a gain of static pressure in the center of the cell that fills at about 75% the pressure dip existing without the layout brought. This improvement of dawn feeding in cooling air helps reduce the average temperature of dawn according to the operating conditions and to increase as a result its lifespan.

Claims (8)

  1. Device for cooling a turbine blade, comprising a blade (11), a disc (12), the blade having a root (13) by means of which it can be fitted into a cavity (14) of the disc (12) of the turbine, the blade possessing an internal air-cooling circuit comprising air inlet means (15) situated on one face of the root of the blade and opposite the said cavity, and air outlet means, the said face of the root of the blade being equipped with a deflector (20) comprising a fin (22, 23), characterized in that the fin is situated on one or other side of the axis of alignment of the air inlet means (15).
  2. Device for cooling a turbine blade, comprising a blade (11), a disc (12), the blade having a root (13) by means of which it can be fitted into a cavity (14) of the disc (12) of the turbine, the blade possessing an internal air-cooling circuit comprising air inlet means (15) situated on one face of the root of the blade and opposite the said cavity, and air outlet means, the said face of the root of the blade being equipped with a deflector (20) comprising at least two fins (22, 23), characterized in that the fins are situated on both sides of the axis of alignment of the air inlet means (15).
  3. Device for cooling a turbine blade according to either one of Claims 1 and 2, characterized in that the deflector forms an integral part of the blade.
  4. Device for cooling a turbine blade according to either one of Claims 1 and 2, characterized in that the deflector (20) is an element added onto the root (13) of the blade (11) and provided with means (21) for access to the air inlet means (15).
  5. Device for cooling a turbine blade according to Claim 4, characterized in that the access means (21) comprise at least one calibrated hole.
  6. Device for cooling a turbine blade according to any one of Claims 1 to 5, characterized in that the said fin (22, 23) is straight or inclined with respect to the general axis of the blade.
  7. Device for cooling a turbine blade according to any one of Claims 1 to 6, characterized in that the deflector (20) comprises at least one fin (22) for channelling the cooling air entering the cavity and at least one fin (23) for channelling some of the air delivered towards the centre of the cavity.
  8. Device for cooling a turbine blade according to any one of Claims 1 to 7, characterized in that the deflector comprises at least one curved fin.
EP02290964A 2001-04-19 2002-04-17 Turbine blade with cooling air baffle Expired - Lifetime EP1251243B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0105289 2001-04-19
FR0105289A FR2823794B1 (en) 2001-04-19 2001-04-19 REPORTED AND COOLED DAWN FOR TURBINE

Publications (3)

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EP1251243A1 EP1251243A1 (en) 2002-10-23
EP1251243B1 true EP1251243B1 (en) 2005-09-07
EP1251243B8 EP1251243B8 (en) 2005-11-02

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EP02290964A Expired - Lifetime EP1251243B8 (en) 2001-04-19 2002-04-17 Turbine blade with cooling air baffle

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US (1) US6981845B2 (en)
EP (1) EP1251243B8 (en)
JP (1) JP4112986B2 (en)
CA (1) CA2444862C (en)
DE (1) DE60205977T2 (en)
ES (1) ES2244738T3 (en)
FR (1) FR2823794B1 (en)
RU (1) RU2325537C2 (en)
UA (1) UA73655C2 (en)
WO (1) WO2002086291A1 (en)

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FR2823794B1 (en) 2003-07-11
JP4112986B2 (en) 2008-07-02
DE60205977T2 (en) 2006-07-06
US20040115054A1 (en) 2004-06-17
RU2325537C2 (en) 2008-05-27
WO2002086291A1 (en) 2002-10-31
EP1251243A1 (en) 2002-10-23
US6981845B2 (en) 2006-01-03
EP1251243B8 (en) 2005-11-02
JP2004522049A (en) 2004-07-22
DE60205977D1 (en) 2005-10-13
UA73655C2 (en) 2005-08-15
FR2823794A1 (en) 2002-10-25
ES2244738T3 (en) 2005-12-16
RU2003133669A (en) 2005-04-20
CA2444862A1 (en) 2002-10-31
CA2444862C (en) 2009-11-24

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