EP2137382A1 - Écran thermique de stator - Google Patents

Écran thermique de stator

Info

Publication number
EP2137382A1
EP2137382A1 EP08735874A EP08735874A EP2137382A1 EP 2137382 A1 EP2137382 A1 EP 2137382A1 EP 08735874 A EP08735874 A EP 08735874A EP 08735874 A EP08735874 A EP 08735874A EP 2137382 A1 EP2137382 A1 EP 2137382A1
Authority
EP
European Patent Office
Prior art keywords
stator heat
heat shield
statorhitzeschild
gas turbine
ribs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08735874A
Other languages
German (de)
English (en)
Other versions
EP2137382B1 (fr
Inventor
Alexander Khanin
Edouard Sloutski
Sergey Vorontsov
Anton Sumin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Technology GmbH
Original Assignee
Alstom Technology AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Priority to SI200830743T priority Critical patent/SI2137382T1/sl
Publication of EP2137382A1 publication Critical patent/EP2137382A1/fr
Application granted granted Critical
Publication of EP2137382B1 publication Critical patent/EP2137382B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/10—Stators
    • F05D2240/11—Shroud seal segments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/55—Seals
    • F05D2240/57—Leaf seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/201—Heat transfer, e.g. cooling by impingement of a fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/20—Heat transfer, e.g. cooling
    • F05D2260/221—Improvement of heat transfer
    • F05D2260/2214—Improvement of heat transfer by increasing the heat transfer surface
    • F05D2260/22141—Improvement of heat transfer by increasing the heat transfer surface using fins or ribs

Definitions

  • the invention relates to a stator heat shield for a gas turbine and a gas turbine equipped with such a stator heat shield.
  • Statorhitzeschilde are in the installed state of a stator or on a housing of a gas turbine. In this case, they are usually mounted on a guide blade carrier and form a radial boundary for a hot gas path of the gas turbine in the region of rotor blades of the gas turbine. In this case, a plurality of such Statorhitzeschilde is arranged adjacent to each other in the circumferential direction relative to a rotational axis of the rotor with respect to each other, whereby a closed ring of individual Statorhitzeschilden is formed.
  • the individual stator heat shields form ring segments. The stator heat shields protect the housing or the guide blade carrier from being exposed to the hot gas of the gas turbine.
  • stator heat shields an outside of the stator heat shields is exposed to the hot gas, while a side facing away from the hot gas path inside of the respective Statorhitzeschilds is acted upon with a suitable cooling gas, to cool the respective stator heat shield.
  • a suitable cooling gas By cooling the service life of the stator heat shields can be increased. In principle, however, there is a need to additionally increase the service life of such stator heat shields.
  • the invention deals with the problem of providing an improved embodiment for a stator heat shield or for a gas turbine equipped therewith, which is characterized in particular by an increased service life of the stator heat shields.
  • the present invention is based on the general idea of combining a flapper cooling, a convection cooling and a sealing element cooling system with each other in the respective stator heat shield. It has been found that a combination of these cooling methods or cooling techniques cause effective cooling and a favorable temperature distribution in the respective stator heat shield, which correspondingly increases the lifetime of the stator heat shields.
  • a plurality of ribs formed on an inner side facing away from a hot gas path of the gas turbine in the installed state of the stator heat shield which axially extend in the installed state with respect to a rotational axis of a rotor of the gas turbine and spaced from each other in the circumferential direction are, can be formed on the inside of several channels. At the same time, these ribs serve to stiffen the respective stator heat shield.
  • a baffle plate is also arranged, which rests on the ribs. In this way, heat can be transferred from the stator heat shield to the respective baffle plate by convection within the channels.
  • the baffle plate itself is acted upon in the operation of the gas turbine by a cooling gas, whereby the heat from the baffle plate can be discharged.
  • the respective stator heat shield is provided with a groove on at least one end face delimiting the stator heat shield in the circumferential direction, into which at least one sealing element can be inserted.
  • Two circumferentially adjacent stator heat shields adjoin one another in the region of these end faces, wherein a relatively small gap is formed as a rule.
  • the respective sealing element now engages in the mutually aligned grooves of the two mutually opposite in the gap end faces and thereby closes the gap and thus the connection between the outside facing the hot gas path with a the inside facing cooling gas path.
  • stator heat shield For cooling these sealing elements, it is proposed according to the invention to provide the stator heat shield with a plurality of bores, which respectively open at one end to the inside and the other end to the end, in such a way that they open out from the groove in the direction of the outside. Further, the holes are arranged spaced apart in the axial direction. Through these holes, cooling gas can pass from the cooling gas path to the hot gas side in the gap between adjacent stator heat shields in the circumferential direction and can there apply cooling gas to the sealing elements. In particular, film cooling of the sealing elements as well as the opposite end faces of the adjacent stator heat shields in the gap can be achieved in the region of the gap.
  • a targeted cooling of this area reduces the temperatures at the respective stator heat shield at the front ends, which reduces the heat load of the stator heat shield and increases its lifetime.
  • Particularly advantageous is an embodiment in which at the respective end face to the groove towards the outside spaced recess is formed, which is open to the outside, which extends in the axial direction over the holes of the respective end face and in which open the holes , By providing such a recess it is achieved that cooling gas can enter into the hot gas side region of the gap even if the stator heat shields adjacent in the circumferential direction are moved towards one another with their end faces opposite each other in the gap, whereby the gap is minimized. Such a gap reduction can occur in certain operating situations of the gas turbine.
  • 1 shows an axial section through a gas turbine in the region of a stator heat shield
  • 2 is a perspective view of a stator heat shield
  • FIG. 3 shows a cross section of the Statorhitzeschilds in the region of an end face corresponding to section lines III in Fig. 2nd
  • a gas turbine 1 of which only a small section is shown here, has a stator 2 and a rotor 3, which are likewise only partially shown. From the stator 2 guide vanes 4 are partially visible and a portion of a vane carrier 5. On the guide vane 5 are on the one hand the vanes 4 attached to the other stator stator 5 are also attached to the stator vane 5, one of which is recognizable here. From the rotor 3, only one blade 7 can be seen here, which is arranged between the two guide vanes 4. A dot-dash line indicates a rotation axis 8 about which the rotor 3 rotates during operation of the gas turbine 1 and which defines the axial direction of the gas turbine 1.
  • Axial in the present context thus means parallel to the axis of rotation 8, while a radial direction is perpendicular to the axis of rotation 8 and a combatsutter is oriented along a circular path about the axis of rotation 8.
  • the blade 7 is arranged axially between the two guide vanes 4.
  • the stator heat shield 6 is disposed radially of the blade 7 and positioned axially between the two vanes 4.
  • the individual Statorhitzeschilde 6 form segments which are arranged adjacent to each other in the circumferential direction and form a closed circular ring which encloses a blade row, which by in the circumferential direction adjacent blades 7 is formed.
  • the respective stator heat shield 6 separates a hot gas path 9 of the gas turbine 1, indicated by an arrow, from a cooling gas path 10, likewise indicated by an arrow, which runs essentially in the stator 2.
  • the respective stator heat shield 6 has an outer side 11, which faces the hot gas path 9 in the installed state.
  • the stator heat shield 6 has an inner side 12, which faces the cooling gas path 10 and is remote from the hot gas path 9 and from the outer side 11.
  • the stator heat shield 6 On its inner side 12, the stator heat shield 6 has a plurality of ribs 13. These ribs 13 extend axially in the installed state and are preferably designed in a straight line. Furthermore, the ribs 13 are arranged spaced from one another in the circumferential direction.
  • at least one baffle plate 14, which rests on the ribs 13, is arranged on the inner side 12. In the example shown in FIG. 2, the baffle plate 14 extends only over one half of the inner side 12. A second baffle plate 14 covering the other half is omitted here for better recognition of the ribs 13. Likewise, a single baffle plate 14 may be provided which covers all the ribs 13.
  • the respective stator heat shield 6 also has, in the circumferential direction, two end faces 15, each delimiting the stator heat shield 6 in the circumferential direction. In at least one of these end faces 15, a groove 16 is incorporated. Preferably, in each case such a groove 16 is incorporated in both end faces 15.
  • two stator heat shields 6 which are adjacent to one another in the circumferential direction adjoin one another in the region of these end faces 15, with two such end faces 15 facing each other in an axial gap 17 indicated in FIG. 3.
  • the grooves 16 are arranged so that they are opposite each other in the axial gap 17 end faces 15th aligned with each other in alignment.
  • the respective groove 16 serves to receive at least one sealing element 18, which is configured, for example, band-shaped or strip-shaped.
  • such a sealing element 18 engages in two mutually aligned grooves 16 at two in the gap 17 opposite end faces 15 at the same time. In this way, the respective sealing element 18 can seal off the axial gap 17, ie separate the hot gas path 9 facing the hot gas path from the cooling gas side facing the cooling gas path 10.
  • the stator heat shield 6 is also equipped with a plurality of holes 19.
  • Each of these holes 19 connects the inner side 12 of one of the end faces 15. Accordingly, the respective bore 19 opens at one end to the inner side 12 and the other end to the respective end face 15.
  • the mouth of the respective bore 19 at the respective end face 15 is spaced from the groove 16, in the direction of the outside 11. In this way, through the bores 19, cooling gas can pass from the cooling gas side or from the cooling gas path 10 to the hot gas side of the gap 17, which is open toward the hot gas path 9.
  • the individual bores 19 are, as shown in FIG. 2, spaced from one another in the axial direction on the respective end face 15 of the stator heat shield 6.
  • the stator heat shield 6 has on at least one of the end faces 15 a recess 20 which is open toward the outside 11 and which extends in the axial direction along the respective side 15.
  • the front side 15 provided with the bores 19 is equipped with the recess 20.
  • the recess 20 extends along all holes 19, so that the holes 19 each open in the recess 20.
  • both end faces 15 are provided with holes 19 and such a recess 20.
  • the recesses 20 make it possible for the cooling gas to escape through the bores 19 to a sufficient extent, even if the gap 17 becomes comparatively narrow in the circumferential direction due to relative movements of the adjacent stator heat shields 6.
  • a cooling of the sealing elements 18 can be effected during operation of the gas turbine 1.
  • a cooling gas film can be produced on the hot gas side of the sealing elements 18, which obstructs direct hot gas loading of the sealing elements 18.
  • the peripheral end regions of the respective stator heat shield 6 provided with the end faces 15 can thereby effectively be cooled, on the one hand by the flow of these end regions with cooling gas and, on the other hand, by the formation of the cooling gas film on the areas of the front side 15 and the outside 11 exposed to the hot gas path 9 ,
  • a depression 21 is expediently formed on the inside 12.
  • the ribs 13 are arranged, in such a way that within the recess 21, a system of mutually communicating channels 22 is formed.
  • the at least one baffle plate 14 covers this system from channels 22 to the cooling gas path 10 from.
  • Within these channels 22 there is a convective heat transfer between the respective stator heat shield 6 and the respective baffle plate 14.
  • a cooling gas flow can be guided by the channel system formed with the channels 22.
  • the respective baffle plate 14 has a plurality of passage openings 23, via the cooling gas from the cooling gas path 10th can pass through the baffle plate 14 in the channels 22.
  • the aforementioned holes 19 now open on the inner side 12 in said recess 21 or in one of the channels 22.
  • the cooling gas entering the channel system through the passage openings 23 can exit via the holes 19 and pass through the stator heat shield 6 to the hot gas side.
  • brackets 24 are formed here, with the aid of which the respective baffle plate 14 can be fixed to the stator heat shield 6.
  • the respective holders 24 overlap the respective flat plate 14 for this purpose.
  • the ribs 13 each have a certain rib height 25, with which they extend in the radial direction. With this fin height 25, the ribs 13 are here from a bottom of the recess 21 from. Furthermore, the individual ribs 13 in the circumferential direction have a rib spacing 26 from one another. According to an advantageous embodiment, the fin height 25 and the fin spacing 26 are coordinated so that a ratio of fin height 25 to rib spacing 26 is less than 0.5 and preferably greater than 0.3. Suitably, said ratio is in the range of 0.328 to 0.492.
  • each individual hole 19 has in the axial direction a certain bore spacing 27 to each other.
  • each individual bore has a specific bore diameter 28.
  • the respective bore diameter 28 and the bore spacing 27 to match so that there is a ratio of bore diameter 28 to bore spacing 27, which is greater than 0.09 is and which is suitably less than 0.15.
  • said ratio may be in a range of 0.0992 to 0.1488.

Landscapes

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

Abstract

La présente invention concerne un écran thermique de stator (6) pour une turbine à gaz (1), comprenant un côté extérieur (11) faisant face, en position montée, à une trajectoire de gaz chaud (9) de la turbine à gaz (1), un côté intérieur (12) opposé au côté extérieur (11), plusieurs nervures (13) réalisées sur le côté intérieur (12) qui, en position montée, s'étendent axialement par rapport à un axe de rotation (8) d'un rotor (3) de la turbine à gaz (1) et qui sont espacées entre elles dans le sens périphérique, au moins une chicane (14) disposée sur le côté intérieur (12), qui repose sur les nervures (13), au moins une rainure (16) réalisée sur un côté frontal (15) délimitant l'écran thermique de stator (6) dans le sens périphérique et dans laquelle au moins un élément d'étanchéité (18) peut être placé et plusieurs trous (19) qui débouchent à une extrémité sur le côté intérieur (12) et à l'autre extrémité sur le côté frontal (15) à une certaine distance de la rainure (16), en direction du côté extérieur (11), et qui sont espacés entre eux dans le sens axial.
EP08735874A 2007-04-19 2008-04-07 Écran thermique de stator Active EP2137382B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200830743T SI2137382T1 (sl) 2007-04-19 2008-04-07 Statorski toplotni ščit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6452007 2007-04-19
PCT/EP2008/054140 WO2008128876A1 (fr) 2007-04-19 2008-04-07 Écran thermique de stator

Publications (2)

Publication Number Publication Date
EP2137382A1 true EP2137382A1 (fr) 2009-12-30
EP2137382B1 EP2137382B1 (fr) 2012-05-30

Family

ID=38349602

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08735874A Active EP2137382B1 (fr) 2007-04-19 2008-04-07 Écran thermique de stator

Country Status (6)

Country Link
US (1) US7997856B2 (fr)
EP (1) EP2137382B1 (fr)
CA (1) CA2684371C (fr)
MX (1) MX2009011266A (fr)
SI (1) SI2137382T1 (fr)
WO (1) WO2008128876A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11168702B2 (en) 2017-08-10 2021-11-09 Raytheon Technologies Corporation Rotating airfoil with tip pocket

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SI2137382T1 (sl) 2007-04-19 2012-10-30 Alstom Technology Ltd Statorski toplotni ščit
IT1395732B1 (it) * 2009-08-03 2012-10-19 Ansaldo Energia Spa Apparecchiatura per l'investigazione sperimentale di sistemi di tenuta assiale di turbine a gas
FR2968350B1 (fr) * 2010-12-06 2016-01-29 Snecma Anneau sectorise de turbine pour turbomachine, et turbomachine equipee d'un tel anneau
US8876458B2 (en) * 2011-01-25 2014-11-04 United Technologies Corporation Blade outer air seal assembly and support
EP2508713A1 (fr) * 2011-04-04 2012-10-10 Siemens Aktiengesellschaft Turbine à gaz comprenant un écran thermique et procédé d'opération
EP2971690B1 (fr) 2013-03-15 2017-10-04 United Technologies Corporation Ensemble rotor à enclenchement avec bouclier thermique
US8814507B1 (en) 2013-05-28 2014-08-26 Siemens Energy, Inc. Cooling system for three hook ring segment
ES2581511T3 (es) * 2013-07-15 2016-09-06 Mtu Aero Engines Gmbh Turbomáquina, segmento de sellado y segmento de álabe de guía
EP2835500A1 (fr) 2013-08-09 2015-02-11 Siemens Aktiengesellschaft Elément d'insertion et turbine à gaz
WO2015084550A1 (fr) * 2013-12-03 2015-06-11 United Technologies Corporation Écrans thermiques pour joints d'étanchéité à l'air
EP2949873A1 (fr) * 2014-05-27 2015-12-02 Siemens Aktiengesellschaft Turbomachine avec blindage à l'ingestion et utilisation de la turbomachine
EP3183431B1 (fr) 2014-08-22 2018-10-10 Siemens Aktiengesellschaft Système de refroidissement de carénage pour des carénages adjacents à des surfaces portantes dans des moteurs à turbine à gaz
EP3118420A1 (fr) * 2015-07-15 2017-01-18 Siemens Aktiengesellschaft Élément de paroi pouvant être refroidi avec plaque de refroidissement par impact
EP3179053B1 (fr) 2015-12-07 2019-04-03 MTU Aero Engines GmbH Structure de carter de turbomachine avec écran de protection thermique
US10513943B2 (en) 2016-03-16 2019-12-24 United Technologies Corporation Boas enhanced heat transfer surface
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Publication number Priority date Publication date Assignee Title
US11168702B2 (en) 2017-08-10 2021-11-09 Raytheon Technologies Corporation Rotating airfoil with tip pocket

Also Published As

Publication number Publication date
MX2009011266A (es) 2009-11-02
SI2137382T1 (sl) 2012-10-30
CA2684371C (fr) 2014-10-21
EP2137382B1 (fr) 2012-05-30
CA2684371A1 (fr) 2008-10-30
WO2008128876A1 (fr) 2008-10-30
US7997856B2 (en) 2011-08-16
US20100047062A1 (en) 2010-02-25

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