EP0985803B1 - Etage de turbine avec entrée radiale et sortie axiale - Google Patents

Etage de turbine avec entrée radiale et sortie axiale Download PDF

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Publication number
EP0985803B1
EP0985803B1 EP19980810899 EP98810899A EP0985803B1 EP 0985803 B1 EP0985803 B1 EP 0985803B1 EP 19980810899 EP19980810899 EP 19980810899 EP 98810899 A EP98810899 A EP 98810899A EP 0985803 B1 EP0985803 B1 EP 0985803B1
Authority
EP
European Patent Office
Prior art keywords
flow
axial
radial
turbine stage
main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19980810899
Other languages
German (de)
English (en)
Other versions
EP0985803A1 (fr
Inventor
Roland Löpfe
Said Dr. Havakechian
Patrick Dr. Escher
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.)
Alstom SA
Original Assignee
Alstom Schweiz 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 Schweiz AG filed Critical Alstom Schweiz AG
Priority to DE59807746T priority Critical patent/DE59807746D1/de
Priority to EP19980810899 priority patent/EP0985803B1/fr
Publication of EP0985803A1 publication Critical patent/EP0985803A1/fr
Application granted granted Critical
Publication of EP0985803B1 publication Critical patent/EP0985803B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01D1/00—Non-positive-displacement machines or engines, e.g. steam turbines
    • F01D1/02—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines
    • F01D1/04—Non-positive-displacement machines or engines, e.g. steam turbines with stationary working-fluid guiding means and bladed or like rotor, e.g. multi-bladed impulse steam turbines traversed by the working-fluid substantially axially
    • 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
    • F01D9/00—Stators
    • F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
    • F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
    • F01D9/048—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector for radial admission

Definitions

  • the present invention relates to a turbine stage with radial inflow and axial outflow, in which a main flow in one Guide blades are directed radially towards a machine axis and a Barrel blading is flowed through in the main axial flow direction a housing-side duct wall and a hub-side duct wall one Include flow channel, which flow channel from a radial extending part, a part running in the axial main direction, and one There is radial-axial flow deflection, which is radial-axial flow deflection a main radial flow into an axial one Redirects main flow.
  • the first stage of a steam turbine group is often of the radial-axial type executed in which the guide blading in radial and the Blades are blown through in the main axial direction. See, for example, document DE-A-2 231 015
  • the main advantage of this arrangement is that it is simple
  • the staggering of the guide vanes to be adapted Power and volume flow class can take place.
  • the radial flow In this case, guide vanes can be attached to the housing on both sides, so that no seal against the rotating shaft is installed here got to.
  • the necessary radial-axial flow deflection a very inhomogeneous and lossy flow of the impeller are accepted.
  • the object of the present invention is in a turbine stage with radial Inflow and axial outflow, in which a main flow in one Guide blades are directed radially towards a machine axis and a Barrel blading is flowed through in the main axial flow direction a housing-side duct wall and a hub-side duct wall one Include flow channel, which flow channel from a radial extending part, a part running in the axial main direction, and one There is radial-axial flow deflection, which is radial-axial flow deflection a main radial flow into an axial one Redirects main flow, the most homogeneous flow possible To create playpens.
  • this is achieved in that downstream of the radial-axial flow deflection the part of the axially directed Flow channel in a first section away from the machine axis points, and immediately before the blading in the purely axial direction runs ..
  • curvature of the main streamline against the original redirection becomes a homogenization of the Axial speed and pressure above the duct height reached.
  • the Exit gap of the seal should be designed so that the leakage is as possible parallel to the main flow along the hub, creating potential harmful interactions with the main flow are further reduced become.
  • the single figure shows an example of the embodiment according to the invention a radial-axial turbine stage.
  • the outer radius of the flow deflection is indeed through the housing formed, due to the function, the designation "hub-side Flow diversion "used.
  • the housing-side wall 27 of the overflow channel 50 receives the housing-side wall 27 of the overflow channel 50 for this purpose, immediately downstream of the deflection, a kink A, downstream which it is guided divergent by the machine axis 10. From the Counter-kink B, the housing-side wall 27 again runs parallel to Machine axis 10, or towards this. Likewise, the hub-side wall 28 downstream of a kink AA away from the machine axis 10 and from Counter kink point BB again parallel.
  • the location of the hub-side kinks AA and BB advantageously becomes one Distance downstream of the corresponding bends A and B on the housing side selected.
  • the pronounced maximum speed, which is on the hub side Deflection 26 forms, dismantled; furthermore, the seal outlet gap 30 additionally supplied mass flow of the main flow below largely avoid harmful interactions.
  • the flow upstream of the Impeller La accelerated in the axial direction which if necessary Areas of excessive impeller incorrect flow occur in particular of the hub-side channel wall 28 can be significantly reduced.
  • the location of the seal exit gap 30 is advantageously at one point selected the highest possible pressure in the flow channel, and such that by the centrifugal force of the main flow the penetration depth of the Leakage flow in the flow channel is limited. The latter can continue to be supported by the fact that the exit gap 30 at the end of the Radial-axial deflection is placed, and the outlet gap 30 through its Design the leakage flow as laminar as possible and parallel to the hub side Channel wall 28 leads.

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

Claims (8)

  1. Etage de turbine avec entrée radiale et sortie axiale, dans lequel un écoulement principal est orienté dans un aubage directeur (Le) radialement par rapport à un axe de machine (10) et un aubage mobile (La) est parcouru par un courant dans la direction axiale de l'écoulement principal, une paroi de canal (27) du côté du carter et une paroi de canal (28) du côté du moyeu enfermant un canal d'écoulement (50), lequel canal d'écoulement se compose d'une partie s'étendant radialement, d'une partie s'étendant dans la direction principale axiale et d'un coude d'écoulement radial-axial, lequel coude d'écoulement radial-axial fait dévier un écoulement principal radial dans un écoulement principal axial, caractérisé en ce qu'en aval du coude d'écoulement radial-axial, la partie du canal d'écoulement (50) orientée dans la direction principale axiale est tournée dans une première partie à l'écart de l'axe de machine (10) et est guidée directement avant l'aubage mobile (La) dans une direction purement axiale.
  2. Etage de turbine selon la revendication 1, caractérisé en ce que le canal d'écoulement (50) présente, directement en amont de l'aubage mobile (La), une diminution de la section transversale parcourue par le courant.
  3. Etage de turbine selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que le canal d'écoulement (50) présente, directement en aval du coude d'écoulement radial-axial, un élargissement de la section transversale.
  4. Etage de turbine selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la paroi de canal (27) du côté du carter présente, entre le coude d'écoulement radial-axiale et l'entrée du rotor, au moins un point d'inflexion (A), en aval duquel la paroi de canal (27) du côté du carter est tournée à l'écart de l'axe de machine (10) dans la direction d'écoulement principal (51), et en ce qu'en aval du point d'inflexion (A), au moins un point d'inflexion contraire (B) est prévu.
  5. Etage de turbine selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la paroi de canal (28) du côté du moyeu présente, entre le coude d'écoulement radial-axial et l'entrée du rotor, au moins un point d'inflexion (AA), en aval duquel la paroi de canal (28) du côté du moyeu s'écarte de l'axe de machine (10) dans la direction d'écoulement principal (51), et en ce qu'en aval du point d'inflexion (AA) au moins un point d'inflexion contraire (BB) est prévu.
  6. Etage de turbine selon la revendication 5, caractérisé en ce que les points d'inflexion du côté du moyeu (AA, BB) sont disposés en aval des points d'inflexion correspondants (A, B) du côté du carter.
  7. Etage de turbine selon l'une quelconque des revendications 1 à 6, dans lequel un courant de fuite d'un joint sans contact s'introduit dans le courant principal, caractérisé en ce qu'un interstice de sortie du joint sans contact est disposé de telle sorte que le courant de fuite soit introduit dans le canal d'écoulement en un point de pression maximale.
  8. Etage de turbine selon l'une quelconque des revendications 1 à 7, dans lequel un courant de fuite d'un joint sans contact s'introduit dans le courant principal, caractérisé en ce qu'un courant de fuite est guidé parallèlement au courant principal.
EP19980810899 1998-09-10 1998-09-10 Etage de turbine avec entrée radiale et sortie axiale Expired - Lifetime EP0985803B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59807746T DE59807746D1 (de) 1998-09-10 1998-09-10 Turbinenstufe mit radialer Zuströmung und axialer Abströmung
EP19980810899 EP0985803B1 (fr) 1998-09-10 1998-09-10 Etage de turbine avec entrée radiale et sortie axiale

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980810899 EP0985803B1 (fr) 1998-09-10 1998-09-10 Etage de turbine avec entrée radiale et sortie axiale

Publications (2)

Publication Number Publication Date
EP0985803A1 EP0985803A1 (fr) 2000-03-15
EP0985803B1 true EP0985803B1 (fr) 2003-04-02

Family

ID=8236307

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980810899 Expired - Lifetime EP0985803B1 (fr) 1998-09-10 1998-09-10 Etage de turbine avec entrée radiale et sortie axiale

Country Status (2)

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EP (1) EP0985803B1 (fr)
DE (1) DE59807746D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1496196A1 (fr) * 2003-07-08 2005-01-12 Siemens Aktiengesellschaft Turbine à vapeur
WO2006048401A1 (fr) * 2004-11-02 2006-05-11 Alstom Technology Ltd Etage de turbine optimise dans une installation de turbines et procede de conception
GB2440344A (en) * 2006-07-26 2008-01-30 Christopher Freeman Impulse turbine design

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429936A (en) * 1943-12-18 1947-10-28 Allis Chalmers Mfg Co Turbine mounting
DE1076145B (de) * 1953-08-25 1960-02-25 Siemens Ag Hochdruckturbine mit Radialbeschaufelung der Gleichdruckregelstufe
GB1162440A (en) * 1967-06-05 1969-08-27 Shell Int Research Gas Turbine.
CH545414A (de) * 1972-05-31 1973-12-15 Bbc Brown Boveri & Cie Erste Stufe einer zweiflutigen Niederdruck-Dampfturbine grosser Leistung
EP0024275A1 (fr) * 1979-08-15 1981-03-04 BBC Aktiengesellschaft Brown, Boveri & Cie. Fixation des anneaux de tuyères
DE4014976C1 (en) * 1990-05-10 1991-07-25 Mtu Friedrichshafen Gmbh Exhaust turbocharger with two-stage axial exhaust turbine - has duct section, adjacent to first turbine stage, as part of axially displaceable ring slider

Also Published As

Publication number Publication date
EP0985803A1 (fr) 2000-03-15
DE59807746D1 (de) 2003-05-08

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