EP0020433B1 - Schaufelgitter für turbine und turbine mit einem solchen schaufelgitter - Google Patents
Schaufelgitter für turbine und turbine mit einem solchen schaufelgitter Download PDFInfo
- Publication number
- EP0020433B1 EP0020433B1 EP79901211A EP79901211A EP0020433B1 EP 0020433 B1 EP0020433 B1 EP 0020433B1 EP 79901211 A EP79901211 A EP 79901211A EP 79901211 A EP79901211 A EP 79901211A EP 0020433 B1 EP0020433 B1 EP 0020433B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- blade
- grid
- ceiling
- floor
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 11
- 230000007423 decrease Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
-
- 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
- F01D5/141—Shape, i.e. outer, aerodynamic form
- F01D5/145—Means for influencing boundary layers or secondary circulations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
- Y10S415/914—Device to control boundary layer
Definitions
- the present invention relates to a grid of blades for a turbine comprising, on the one hand, a series of blades arranged between a ceiling and a floor, thus defining a series of channels traversed by the fluid supplying the turbine, each channel being limited by the upper surface of a dawn and the lower surface of the neighboring dawn, the floor and the ceiling, and, on the other hand, at least one communication pierced in the ceiling and / or at least one communication pierced in the floor, each communication opening at one end into a channel and at the other end at a point located downstream of said grid.
- the slippage generates a whirlwind of trigonometric direction at the ceiling of the channel and in the opposite direction to the floor for an observer placed downstream of the grid of blades.
- German Patent No. 893649 that the communications opening into the channel have a mouth located in the middle part of the ceiling at equal distance between the upper surface of the dawn and the lower surface of the neighboring dawn limiting the channel.
- This communication is of fairly large diameter (relative to the dimensions of the channel) to allow suction of the boundary layer.
- the blade grid according to the invention is characterized in that for each communication the end opening into the channel is located in the vicinity of the lower surface of the blade limiting said channel at the level of the neck at a point distant from the part median of this channel.
- This point being connected by communication to a point located downstream of the grid (therefore at reduced pressure) the pressure at this point decreases, which reduces the skid of the boundary layer, thus making it useful for working in the channel considered.
- the blade grid does not have a ceiling (in the case of certain movable blades) or floor (in the case of certain fixed blades), communications are then provided only in the floor (in the case of said movable blades) or in the ceiling (case of said fixed blades).
- the invention also relates to a turbine comprising a fixed blade grid followed by a movable blade grid, each of the blade grids comprising a series of blades arranged between a ceiling and a floor thus defining a series of channels traversed by the fluid supplying the turbine, each channel being limited by the upper surface of a blade and the lower surface of the neighboring blade, the floor and the ceiling, the fixed blade grid comprising for each blade at least one pierced communication in the ceiling and opening at one end into a channel and at the other end at a point located downstream of said grid, said turbine comprising at the level of the movable blade grid sealing wipers surrounding the ceiling of said grid , characterized in that for each communication the end opening into the channel is located in the vicinity of the lower surface of the blade limiting said channel at the level of the neck at a point distant from the middle part of this channel, and therefore at the point can al which is at maximum pressure.
- FIG. 1 there are shown two blades A and B which are part of a crown and whose foot is fixed on a floor 1 and the head on a ceiling 2.
- the floor and the ceiling are usually cylindrical or frustoconical surfaces.
- the intrados of dawn B, the extrados of dawn A and the floor and the ceiling define a channel 3.
- the flow is done by following healthy nets such as (c ).
- the fluid streams are orthogonal to the isobars and in the directions shown (1) (m) then begin to swirl as soon as they hit the upper surface of the dawn (A) .
- FIG. 2 there is shown in axial section a turbine provided with grids of fixed and movable blades according to the invention.
- each movable blade grid 4 is located between two grids of fixed blades 5 and 5 '.
- the direction of fluid flow is indicated by arrow F.
- the movable vane grids 4 are integral with the rotor 6 while the fixed vane grids 5 and 5 ′ are integral with the stator 7.
- the fixed vane grids 5 are provided with sealing wipers 8 which reduce the leaks between rotor 6 and fixed vane grids 5.
- the stator 7 is provided sealing wipers 9 which reduce leaks between the stator 7 and the ceiling 12 of the movable blade grid 4.
- the movable blade grid 4 comprises for each blade a communication 13 hollowed out in the floor 11 between a point located in the vicinity of the lower surface of the blade and at the level of the neck 10 of the channel limited by said lower surface and a point located in downstream of the movable blade grid 4 (see Figures 2 and 3).
- the movable blade grid 4 also includes, for each blade, a communication 14 hollowed out in the ceiling 12 between a point located in the vicinity of the lower surface of the blade and at the level of the neck of the channel bounded by said lower surface and which terminates downstream of the movable vane grid 4 (see Figure 2).
- the neck or constriction of the canal is the region of the canal where the distance between upper and lower surfaces is minimal.
- the fixed blade grid (5 or 5 ′) comprises for each blade a communication 23 hollowed out in the floor 21 which starts from a point located in the vicinity of the lower surface of the blade at the neck of the channel limited by said lower surface and which ends downstream of the fixed vane grid 5 (see FIG. 2).
- the fixed blade grid 5 or 5 ′ also includes, for each blade, a communication 24, hollowed out in the ceiling 22, between a point located in the vicinity of the lower surface of the blade at the level of the neck 20 of the channel limited by said lower surface and a point located downstream of the fixed vane grid 5 (see FIGS. 2 and 4).
- the leakage of fluid through the communications 24 serves to supply the leakage of fluid between the wipers 9 and the ceiling 12 of the next movable vane grid 4 and preferably the flow rate of the communications 24 is chosen to be less than or equal to the leakage flow rate between the wipers 9 and the ceiling 12.
- the fluid leakage through the communications 13 is used to supply the fluid leakage between the wipers of the next fixed vane grid and the rotor and preferably the flow rate of the communications 13 is chosen to be less than or equal to the leakage flow rate between wipers and rotor.
- the communications between a point of the floor and / or of the ceiling located in the vicinity of the lower surface of the blades at the level of the neck of the channel limited by the lower surface and a point located in a low pressure chamber constituted by the part situated downstream of the blades allow to lower the overpressure in the vicinity of the lower surface of the blades at the floor and / or ceiling.
- the turbine according to the invention could include such communications only on the grids of fixed blades or on the grids of movable blades hollowed out in the floor and / or the ceiling of these grids.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7828459A FR2438155A1 (fr) | 1978-10-05 | 1978-10-05 | Grille d'aubes pour turbine ou compresseur et turbine ou compresseur comportant une telle grille d'aubes |
FR7828459 | 1978-10-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0020433A1 EP0020433A1 (de) | 1981-01-07 |
EP0020433B1 true EP0020433B1 (de) | 1983-08-03 |
Family
ID=9213364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79901211A Expired EP0020433B1 (de) | 1978-10-05 | 1980-04-22 | Schaufelgitter für turbine und turbine mit einem solchen schaufelgitter |
Country Status (7)
Country | Link |
---|---|
US (1) | US4335995A (de) |
EP (1) | EP0020433B1 (de) |
JP (1) | JPS55500786A (de) |
BE (1) | BE886657A (de) |
DE (1) | DE2966029D1 (de) |
FR (1) | FR2438155A1 (de) |
WO (1) | WO1980000728A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19524984A1 (de) * | 1995-07-08 | 1997-01-09 | Abb Management Ag | Leitschaufelreihe für eine Turbine |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4863348A (en) * | 1987-02-06 | 1989-09-05 | Weinhold Wolfgang P | Blade, especially a rotor blade |
GB2207465B (en) * | 1987-07-18 | 1992-02-19 | Rolls Royce Plc | A compressor and air bleed arrangement |
US5020970A (en) * | 1989-07-13 | 1991-06-04 | Dresser-Rand Company | Fluid-handling, bladed rotor |
FR2661944B1 (fr) * | 1990-05-14 | 1994-06-10 | Alsthom Gec | Etage de turbomachine avec pertes secondaires reduites. |
FR2666846B1 (fr) * | 1990-09-13 | 1992-10-16 | Alsthom Gec | Grille d'aubes pour turbomachine munie de fentes d'aspiration dans le plafond et/ou dans le plancher et turbomachine comportant ces grilles. |
EP1147291B1 (de) | 1998-02-26 | 2007-08-22 | Allison Advanced Development Company | Zapfsystem für eine kompressorwand sowie betriebsverfahren |
US6773227B2 (en) * | 2003-01-10 | 2004-08-10 | General Electric Company | Wheel space pressure relief device |
FR2916815B1 (fr) * | 2007-05-30 | 2017-02-24 | Snecma | Compresseur a reinjection d'air |
EP2055901A1 (de) * | 2007-10-31 | 2009-05-06 | Siemens Aktiengesellschaft | Schaufel mit einem Fußbereich für Turbine in einem Kraftwerk |
US9032738B2 (en) | 2012-04-25 | 2015-05-19 | Siemens Aktiengeselischaft | Gas turbine compressor with bleed path |
US9194259B2 (en) * | 2012-05-31 | 2015-11-24 | General Electric Company | Apparatus for minimizing solid particle erosion in steam turbines |
JP5591986B2 (ja) * | 2013-07-22 | 2014-09-17 | 三菱重工業株式会社 | 端壁部材及びガスタービン |
CZ2022355A3 (cs) * | 2022-08-25 | 2023-10-25 | Doosan Ĺ koda Power s.r.o. | Turbínová sestava axiální turbíny |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR341014A (fr) * | 1903-10-15 | 1904-07-27 | Georges Westinghouse | Perfectionnements dans les turbines à fluide sous pression |
US2291828A (en) * | 1940-05-04 | 1942-08-04 | Westinghouse Electric & Mfg Co | Turbine blading |
DE893649C (de) * | 1940-05-04 | 1953-10-19 | Siemens Ag | Einrichtung an Dampf- oder Gasturbinenbeschaufelungen |
DE1106027B (de) * | 1955-07-18 | 1961-05-04 | Power Jets Res & Dev Ltd | Axialverdichter, dessen Lauf- und/oder Leitschaufeln mit einem Deckband versehen sind |
JPS5159106A (ja) * | 1974-11-16 | 1976-05-24 | Mitsubishi Heavy Ind Ltd | Taabokikai |
JPS5254809A (en) * | 1975-10-31 | 1977-05-04 | Hitachi Ltd | Axial-flow fluid machine construction |
JPS5254807A (en) * | 1975-10-31 | 1977-05-04 | Hitachi Ltd | Axial-flow fluid machine |
-
1978
- 1978-10-05 FR FR7828459A patent/FR2438155A1/fr active Granted
-
1979
- 1979-10-04 WO PCT/FR1979/000089 patent/WO1980000728A1/fr unknown
- 1979-10-04 US US06/196,792 patent/US4335995A/en not_active Expired - Lifetime
- 1979-10-04 JP JP50162079A patent/JPS55500786A/ja active Pending
- 1979-10-04 DE DE7979901211T patent/DE2966029D1/de not_active Expired
-
1980
- 1980-04-22 EP EP79901211A patent/EP0020433B1/de not_active Expired
- 1980-12-15 BE BE1/10074A patent/BE886657A/fr not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19524984A1 (de) * | 1995-07-08 | 1997-01-09 | Abb Management Ag | Leitschaufelreihe für eine Turbine |
Also Published As
Publication number | Publication date |
---|---|
FR2438155B1 (de) | 1981-08-14 |
JPS55500786A (de) | 1980-10-16 |
WO1980000728A1 (fr) | 1980-04-17 |
BE886657A (fr) | 1981-06-15 |
FR2438155A1 (fr) | 1980-04-30 |
EP0020433A1 (de) | 1981-01-07 |
DE2966029D1 (en) | 1983-09-08 |
US4335995A (en) | 1982-06-22 |
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