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EP0595692A1 - Diffusor for gas turbine exhaust - Google Patents

Diffusor for gas turbine exhaust

Info

Publication number
EP0595692A1
EP0595692A1 EP19930402592 EP93402592A EP0595692A1 EP 0595692 A1 EP0595692 A1 EP 0595692A1 EP 19930402592 EP19930402592 EP 19930402592 EP 93402592 A EP93402592 A EP 93402592A EP 0595692 A1 EP0595692 A1 EP 0595692A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
cross
section
sleeve
square
exhaust
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
EP19930402592
Other languages
German (de)
French (fr)
Other versions
EP0595692B1 (en )
Inventor
Jacques Poux
Liberto Gandia
Frédéric Rouget
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.)
European Gas Turbines SA
Original Assignee
European Gas Turbines SA
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

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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
    • F01D25/00Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/30Exhaust heads, chambers, or the like

Abstract

The present invention relates to a gas turbine exhaust diffuser (nozzle) intended to be inserted downstream of a last expansion stage made up of an outlet sleeve (1) of circular cross-section including a central bulb (2). It comprises: - a flared transition sleeve (3) of circular cross-section identical to that of the outlet sleeve (1) of the last stage at its inlet and of square cross-section at its outlet, - four fixed fins (4) located inside the said sleeves (1,3) and respectively close to each corner of the square cross-section and directing the exhaust gases towards the corners of the square cross-section. <IMAGE>

Description

  • [0001] [0001]
    La présente invention se rapporte à un diffuseur d'échappement de turbine à gaz. The present invention relates to a gas turbine exhaust diffuser.
  • [0002] [0002]
    Elle concerne plus exactement un diffuseur d'échappement pour turbine à gaz destiné à être inséré en aval d'un dernier étage de détente constitué d'une gaine de sortie de section circulaire comportant un bulbe central. It relates more precisely an exhaust diffuser for a gas turbine intended to be inserted downstream from a last expansion stage constituted by a circular section outlet duct having a central bulge.
  • [0003] [0003]
    Les gaz des turbines à gaz quittent le dernier étage de détente avec une très grande vitesse. gas turbines of the gas leaving the last flash stage with a very high speed. Il est nécessaire de réduire considérablement cette vitesse avant de rejeter les gaz à l'atmosphère de façon à assurer la fiabilité du matériel d'échappement en réduisant les sollicitations dues à l'écoulement, à favoriser les performances de la turbomachine en limitant la perte de charge de l'écoulement et à être capable de traiter convenablement le bruit émis par l'échappement de la turbomachine. It is necessary to significantly reduce the speed before discharging gas to the atmosphere to ensure the reliability of the exhaust equipment by reducing the stress caused to flow, to promote the performance of the turbine engine in limiting loss charge flow and to be able to properly process the noise emitted by the exhaust of the turbomachine.
  • [0004] [0004]
    La maîtrise du problème de la diffusion de l'écoulement des gaz d'échappement est donc essentiel à la maîtrise technique des performances générales d'une turbine à gaz. Mastering the problem of dissemination of the flow of exhaust gases is essential to the technical mastery of the overall performance of a gas turbine.
  • [0005] [0005]
    Le dimensionnement des gaines et des organes diffusants est également d'un impact économique non négligeable surtout lorsque les tailles des machines augmentent comme actuellement et la compacité des gaines d'échappement est un autre paramètre essentiel à la réalisation d'un système d'évacuation des gaz performant. The sizing of ducts and scattering bodies is also a significant economic impact especially when machines sizes increase as currently and compactness of the exhaust duct is another essential parameter to achieve a disposal system performing gas.
  • [0006] [0006]
    L'échappement des turbines à gaz se fait dans une gaine de section circulaire et la voie d'air s'en échappant, compte tenu du bulbe central est jusqu'à un certain point de section annulaire. The exhaust gas turbine is in a circular section duct and the air path escaping therefrom in view of the central bulb is to a certain extent of annular section. La terminaison du bulbe central et donc de la section d'écoulement annulaire est la zone la plus critique de la diffusion. Terminating the central bulge and thus the annular flow section is the most critical of the diffusion area. C'est en effet là que cette diffusion trouve ses limites et ses sources d'instabilité. It is indeed here that this broadcast has its limitations and sources of instability.
  • [0007] [0007]
    De façon générale, la sortie de cette gaine de section circulaire doit être reliée à une gaine de section carrée afin d'obtenir une gaine exploitable pour la mise en place de dispositifs silencieux et également obtenir une compacité globale des gaines. In general, the output of the circular section sheath must be connected to a square-section duct in order to achieve a workable sheath for the introduction of silent devices and also achieve an overall compactness of the sheaths. Cette transition limite la possibilité de diffuser correctement les gaz, de façon stable et avec des profils de vitesses homogènes. This transition limits the ability to properly distribute the gas, stably and with profiles of uniform speeds.
  • [0008] [0008]
    La présente invention propose un diffuseur destiné à être intercalé entre la sortie de la gaine de section circulaire et l'entrée d'une gaine de section carrée de dispositifs silencieux par exemple qui résolve tout problème d'instabilité de l'écoulement. The present invention provides a diffuser intended to be interposed between the output of the circular section sheath and the entrance of a square-section duct silencers for example which solves problems of flow instability.
  • [0009] [0009]
    Pour ce faire, conformément à l'invention, ce diffuseur comprend To do this, in accordance with the invention, the diffuser comprises
    • une gaine de transition évasée, de section circulaire identique à celle de la gaine de sortie du dernier étage à son entrée et de section carrée à sa sortie, a flared transition duct by identical circular cross-section than the outlet duct of the last stage at its input and a square section at its output,
    • quatre ailettes fixes disposées à l'intérieur desdites gaines et respectivement à proximité de chaque coin de la section carrée et dirigeant les gaz d'échappement vers les coins de la section carrée. four fixed fins disposed inside said ducts, close to each corner of the square section and directing the exhaust gas respectively to the corners of the square section.
  • [0010] [0010]
    De préférence, chaque ailette est constituée d'une tôle en forme de quadrilatère à diagonales perpendiculaires pliée selon sa plus grande diagonale pour avoir une section transversale en V, l'ouverture du V étant tournée vers la paroi interne desdites gaines. Preferably, each fin comprises a quadrilateral-shaped sheet with perpendicular diagonals folded along its long diagonal to have a cross section V, the opening of the V facing the inside wall of said sheaths.
  • [0011] [0011]
    Avantageusement, la plus grande diagonale pliée est disposée inclinée, son extrémité en amont étant à proximité de l'extrémité du bulbe, distante de l'axe de symétrie de la gaine de transition d'une distance légèrement supérieure au rayon du bulbe, et son extrémité en aval étant disposée à proximité des coins de la section carrée. Advantageously, the folded long diagonal is disposed sloping, with its upstream end being near the end of the bulb remote from the axis of symmetry of the transition duct to a distance slightly greater than the radius of the bulb, and downstream end disposed near the corners of the square section.
  • [0012] [0012]
    Les fonctions et avantages de ces caractéristiques apparaîtront à la lecture de la description ci-après, où l'invention est décrite plus en détail à l'aide de dessins ne représentant qu'un mode de réalisation préféré de l'invention. The functions and advantages of these features will appear on reading the following description, where the invention is described in more detail using drawings representing only one preferred embodiment of the invention.
  • [0013] [0013]
    La figure 1 est une vue en perspective du diffuseur conforme à l'invention monté en aval d'un dernier étage de turbine à gaz, vu de l'aval de l'écoulement. Figure 1 is a perspective view of the diffuser according to the invention mounted downstream of a last gas turbine stage, seen from downstream of the flow.
  • [0014] [0014]
    La figure 2 est une vue en perspective du diffuseur conforme à l'invention monté en aval d'un dernier étage de turbine à gaz, vu de l'amont de l'écoulement. Figure 2 is a perspective view of the diffuser according to the invention mounted downstream of a last gas turbine stage, seen from the upstream of the flow.
  • [0015] [0015]
    La figure 3 est une vue en coupe longitudinale du diffuseur conforme à l'invention monté sur un dernier étage de turbine à gaz, représentant l'écoulement des gaz. Figure 3 is a longitudinal sectional view of the diffuser according to the invention mounted on a last gas turbine stage, representing the gas flow.
  • [0016] [0016]
    Le diffuseur d'échappement pour turbine à gaz est inséré en aval d'un dernier étage de détente constitué d'une gaine 1 de section circulaire comportant un bulbe central 2, cylindrique de section diminuant à son extrémité. The exhaust diffuser for a gas turbine is inserted downstream from a last expansion stage constituted by a sleeve 1 of circular section having a central bulge 2, cylindrical section descending at its end.
  • [0017] [0017]
    Le diffuseur comprend The diffuser includes
    • une gaine de transition 3 évasée, de section circulaire identique à celle de la gaine 1 du dernier étage à son entrée et de section carrée à sa sortie, a transition duct 3 flared, circular section identical to that of the sheath 1 of the last stage at its input and a square section at its output,
    • quatre ailettes 4 fixes disposées à l'intérieur desdites gaines 1,3 et respectivement à proximité de chaque coin de la section carrée et dirigeant les gaz d'échappement vers les coins de la section carrée. 4 four fixed fins disposed inside said ducts 1,3 and respectively near each corner of the square section and directing the exhaust gases towards the corners of the square section.
  • [0018] [0018]
    Les gaines 1,3 sont renforcées de façon connue de raidisseurs 9 soudés sur leur paroi externe. The sheaths 1,3 are reinforced in a known manner of stiffeners 9 welded on their outer wall. Les ailettes 4 sont fixées de préférence par soudage de barrettes non représentées sur les figures 1 et 2 et référencées par le référence 10 sur la figure 3, soudées sur chaque ailette 4 et sur la paroi interne de la gaine de transition 3. The fins 4 are fixed preferably by welding strips not shown in Figures 1 and 2 and referenced by the reference 10 in Figure 3, welded to each fin 4 and the inner wall of the transition duct 3.
  • [0019] [0019]
    Chaque ailette 4 est constituée d'une tôle en forme de quadrilatère à diagonales perpendiculaires pliée selon sa plus grande diagonale 5 pour avoir une section transversale en V, l'ouverture du V étant tournée vers la paroi interne desdites gaines 1,3. Each fin 4 is made of a sheet perpendicular diagonals in quadrilateral-shaped folded along its longest diagonal 5 to have a cross section V, the opening of the V facing the inside wall of said sheaths 1.3. La plus grande diagonale pliée 5 est disposée inclinée, son extrémité en amont 6 étant à proximité de l'extrémité du bulbe 2, distante de l'axe de symétrie 8 de la gaine de transition 3 d'une distance légèrement supérieure au rayon du bulbe 2, et son extrémité en aval 7 étant disposée à proximité des coins de la section carrée. The largest diagonal folded 5 is disposed sloping, with its upstream end 6 being near the end of the bulb 2, remote from the axis of symmetry 8 of the transition sleeve 3 of a distance slightly greater than the radius of the bulb 2, and its downstream end 7 being disposed near the corners of the square section.
  • [0020] [0020]
    La diffusion des gaz qui en résulte est représentée sur la figure 3. L'écoulement en aval 11 est de section annulaire autour du bulbe 2. En arrivant au niveau de l'extrémité du bulbe 3, au lieu d'entrer dans une zone particulièrement instable, il est guidé par les ailettes 4 qui le diffuse de façon pratiquement parfaite sur toute la surface 12 de la section carrée de la gaine de transition 3, en le dirigeant en particulier dans les coins de celle-ci. Gas diffusion which results is shown in Figure 3. The downstream flow 11 is of annular section around the bulb 2. In arriving at the end of the bulb 3, instead of entering a particular area unstable, it is guided by the fins 4 which shows the so practically perfect over the entire surface 12 of the square section of the transition duct 3, in the particular leader in the corners thereof.
  • [0021] [0021]
    L'utilisation d'une gaine de section carrée tangente à la gaine de section circulaire 1 permet de ne pas accentuer la diffusion sur les axes verticaux et horizontaux. The use of a square sheath tangent to the circular section sheath 1 allows not to increase the diffusion of the vertical and horizontal axes.
  • [0022] [0022]
    Grâce aux ailettes 4, une partie du fluide énergétique et stable au niveau de l'extrémité du bulbe 2 est prélevée pour être dirigée vers les coins de diffusion maximale. With fins 4, part of the working fluid and stable at the end of the bulb 2 is taken to be directed towards the corners maximum diffusion. Ces ailettes 4 déversent les gaz à la fois progressivement sur les côtés de la section carrée et injectent une partie de ceux-ci dans les coins de la section carrée, par l'intermédiaire de la gaine de transition 3. These fins 4 discharge the gas simultaneously progressively on the sides of the square section and inject a portion thereof in the corners of the square cross-section through the transition duct 3.
  • [0023] [0023]
    La conception de ces ailettes 4 permet d'obtenir, quelques mètres en aval, la stabilité du fluide ralenti, ceci pour une plage assez grande d'angles d'incidence de l'écoulement sur elles, d'environ plus ou moins 30°. The design of the fins 4 provides a few meters downstream, the stability of the fluid slowed this for quite a large range of incident angles of flow over them, about more or less 30 °.
  • [0024] [0024]
    De plus, aux points de fonctionnement les plus fréquents et aux points de design des installations avec turbines à gaz, ce diffuseur permet d'obtenir des répartitions de vitesses d'écoulement très bonnes, quelques mètres en aval, le rapport de la vitesse moyenne sur la vitesse théorique étant d'environ plus ou moins 30%. In addition to the most common operating points and design points facilities with gas turbines, diffuser provides distributions very good flow rates, a few meters downstream, the ratio of the average speed on the theoretical speed being about plus or minus 30%.
  • [0025] [0025]
    Enfin, ce diffuseur n'engendre que peu de perte de charge, liée aux performances de la turbine à gaz, et permet, dans un encombrement minimal, d'obtenir un gain de performance très supérieur à cesdites pertes. Finally, the diffuser generates only little loss, linked to performance of the gas turbine, and allows, in minimum width, to get a performance gain much higher than these said losses.

Claims (3)

1) Diffuseur d'échappement pour turbine à gaz destiné à être inséré en aval d'un dernier étage de détente constitué d'une gaine de sortie (1) de section circulaire comportant un bulbe central (2), caractérisé en ce qu'il comprend 1) gas turbine exhaust diffuser intended to be inserted downstream from a last expansion stage constituted by an outlet duct (1) of circular section having a central bulb (2), characterized in that comprises
- une gaine de transition (3) évasée, de section circulaire identique à celle de la gaine de sortie (1) du dernier étage à son entrée et de section carrée à sa sortie, - a transition duct (3) flared circular section identical to that of the outlet duct (1) of the last stage at its input and a square section at its output,
- quatre ailettes (4) fixes disposées à l'intérieur desdites gaines (1,3) et respectivement à proximité de chaque coin de la section carrée et dirigeant les gaz d'échappement vers les coins de la section carrée. - four blades (4) fixed disposed within said casings (1,3) and respectively close to each corner of the square section and directing the exhaust gases towards the corners of the square section.
2) Diffuseur selon la revendication 1, caractérisé en ce que chaque ailette (4) est constituée d'une tôle en forme de quadrilatère à diagonales perpendiculaires pliée selon sa plus grande diagonale (5) pour avoir une section transversale en V, l'ouverture du V étant tournée vers la paroi interne desdites gaines (1,3). 2) A diffuser according to Claim 1, characterized in that each fin (4) is composed of a quadrilateral-shaped sheet with perpendicular diagonals folded along its long diagonal (5) have a cross section V-opening of the V being turned towards the inner wall of said sheaths (1,3).
3) Diffuseur selon la revendication 2, caractérisé en ce que la plus grande diagonale pliée (5) est disposée inclinée, son extrémité en amont (6) étant à proximité de l'extrémité du bulbe (2), distante de l'axe de symétrie (8) de la gaine de transition (3) d'une distance légèrement supérieure au rayon du bulbe (2), et son extrémité en aval (7) étant disposée à proximité des coins de la section carrée. 3) A diffuser according to Claim 2, characterized in that the folded long diagonal (5) is disposed sloping, with its upstream end (6) being near the end of the bulb (2), remote from the axis of symmetry (8) of the transition duct (3) a distance slightly greater than the radius of the bulb (2), and its downstream end (7) being disposed near the corners of the square section.
EP19930402592 1992-10-26 1993-10-22 Diffusor for gas turbine exhaust Expired - Lifetime EP0595692B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9212724 1992-10-26
FR9212724A FR2697287B1 (en) 1992-10-26 1992-10-26 Gas turbine exhaust diffuser.

Publications (2)

Publication Number Publication Date
EP0595692A1 true true EP0595692A1 (en) 1994-05-04
EP0595692B1 EP0595692B1 (en) 1996-06-05

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EP19930402592 Expired - Lifetime EP0595692B1 (en) 1992-10-26 1993-10-22 Diffusor for gas turbine exhaust

Country Status (4)

Country Link
US (1) US5462088A (en)
EP (1) EP0595692B1 (en)
DE (2) DE69302989D1 (en)
FR (1) FR2697287B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2934009A1 (en) * 2008-07-21 2010-01-22 Ge Energy Products France Snc Exhaust gas turbine diffuser
CN103032171A (en) * 2011-10-03 2013-04-10 通用电气公司 Exhaust gas diffuser

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CN1263953C (en) * 2000-10-17 2006-07-12 菲舍尔和佩克尔应用有限公司 Linear Compressor
US6896475B2 (en) * 2002-11-13 2005-05-24 General Electric Company Fluidic actuation for improved diffuser performance
WO2007019336A3 (en) * 2005-08-04 2007-04-19 Rolls Royce Corp Ltd Gas turbine exhaust diffuser
US20090280009A1 (en) * 2008-01-16 2009-11-12 Brock Gerald E Wind turbine with different size blades for a diffuser augmented wind turbine assembly
US20090180869A1 (en) * 2008-01-16 2009-07-16 Brock Gerald E Inlet wind suppressor assembly
US20090280008A1 (en) 2008-01-16 2009-11-12 Brock Gerald E Vorticity reducing cowling for a diffuser augmented wind turbine assembly
US8257025B2 (en) * 2008-04-21 2012-09-04 Siemens Energy, Inc. Combustion turbine including a diffuser section with cooling fluid passageways and associated methods
US8337153B2 (en) * 2009-06-02 2012-12-25 Siemens Energy, Inc. Turbine exhaust diffuser flow path with region of reduced total flow area
US8668449B2 (en) * 2009-06-02 2014-03-11 Siemens Energy, Inc. Turbine exhaust diffuser with region of reduced flow area and outer boundary gas flow
US8647057B2 (en) * 2009-06-02 2014-02-11 Siemens Energy, Inc. Turbine exhaust diffuser with a gas jet producing a coanda effect flow control
US20110236201A1 (en) * 2010-03-23 2011-09-29 Sumedhkumar Vyankatesh Shende Method and apparatus for radial exhaust gas turbine
DE202010016820U1 (en) * 2010-12-21 2012-03-26 Ebm-Papst Mulfingen Gmbh & Co. Kg Diffuser for a fan and fan assembly having such a diffuser
US20130087632A1 (en) * 2011-10-11 2013-04-11 Patrick Germain Gas turbine engine exhaust ejector nozzle with de-swirl cascade
DE102012003336A1 (en) * 2012-02-17 2013-08-22 Ziehl-Abegg Ag Diffuser fan with such a diffuser device as well as with such ventilators
US9822664B1 (en) 2013-03-14 2017-11-21 Calpine Corporation Turbine exhaust cylinder baffle seal and method for installing turbine exhaust cylinder baffle seal
WO2014175763A1 (en) 2013-04-25 2014-10-30 Siemens Aktiengesellschaft Turbo-machine and waste heat utilization device
EP2918791A1 (en) * 2014-03-13 2015-09-16 Siemens Aktiengesellschaft Device for guiding a hot gas and use of moulding sand
EP2947283B1 (en) 2014-05-23 2017-01-11 GE Energy Products France SNC Thermal-acoustic insulation structure for the exhaust of a rotating machine
DE102014114798A1 (en) 2014-10-13 2016-04-14 Thermofin Gmbh Axial fan with external and internal diffuser
DE102015213625A1 (en) * 2015-07-20 2017-01-26 Rolls-Royce Deutschland Ltd & Co Kg Diffuser component for a gas turbine

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
FR2934009A1 (en) * 2008-07-21 2010-01-22 Ge Energy Products France Snc Exhaust gas turbine diffuser
WO2010010277A1 (en) * 2008-07-21 2010-01-28 Ge Energy Products France Snc Exhaust diffuser for a gas turbine
DE112009001754T5 (en) 2008-07-21 2011-07-28 Ge Energy Products France Snc Exhaust diffuser for gas turbine
CN103032171A (en) * 2011-10-03 2013-04-10 通用电气公司 Exhaust gas diffuser

Also Published As

Publication number Publication date Type
DE69302989T2 (en) 1996-10-31 grant
FR2697287A1 (en) 1994-04-29 application
US5462088A (en) 1995-10-31 grant
EP0595692B1 (en) 1996-06-05 grant
DE69302989D1 (en) 1996-07-11 grant
FR2697287B1 (en) 1994-12-09 grant

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