EP0638725A1 - Device for secondary air bleeding from an axial compressor - Google Patents

Device for secondary air bleeding from an axial compressor Download PDF

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Publication number
EP0638725A1
EP0638725A1 EP94111013A EP94111013A EP0638725A1 EP 0638725 A1 EP0638725 A1 EP 0638725A1 EP 94111013 A EP94111013 A EP 94111013A EP 94111013 A EP94111013 A EP 94111013A EP 0638725 A1 EP0638725 A1 EP 0638725A1
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EP
European Patent Office
Prior art keywords
slot
compressor
mini
guide vane
removal slot
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.)
Ceased
Application number
EP94111013A
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German (de)
French (fr)
Inventor
Thomas Meindl
Pierre Meylan
Thomas Dr. Zierer
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.)
ABB AG Germany
Original Assignee
ABB Management AG
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Filing date
Publication date
Application filed by ABB Management AG filed Critical ABB Management AG
Publication of EP0638725A1 publication Critical patent/EP0638725A1/en
Ceased legal-status Critical Current

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    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
    • F04D27/023—Details or means for fluid extraction

Definitions

  • the invention relates to a device for extracting secondary air from an axial compressor, a circumferential slot being used for the removal.
  • Secondary air is taken from the turbine to supply cooling air to the compressors.
  • a certain total pressure is necessary.
  • a peripheral slot is usually used to extract the secondary air. The extracted air passes through the extraction slot into the extraction plenum and from there via the extraction pipe into the cooling system of the turbine. Unfortunately, a large part of the dynamic pressure is lost during removal.
  • the invention tries to avoid this disadvantage. It is the object of the invention to provide a device for taking secondary air from an axial compressor using a circumferential removal slot, which is at least partially designed as a diagonal diffuser, in which the total pressure loss is minimized.
  • the means for converting the kinetic energy of the peripheral component of the flow velocity is a mini-baffle which is arranged directly in the entry region of the removal slot which has a constant height. The circumferential speed is thereby converted into static pressure and thus the total pressure loss is minimized.
  • the mini guide vane is arranged on the compressor guide wheel at the entry of the removal slot, the guide guide of the compressor and the mini guide guide having different deflection angles and / or different numbers of blades.
  • mini guide vane is arranged at the end of the removal slot which is divergent over the entire length.
  • the extraction slot is advantageously designed as a diagonal diffuser, which merges into a spiral, the spiral opening directly into the extraction tube.
  • part of the peripheral speed is converted into static pressure and part of the peripheral speed becomes a transport component.
  • Fig. 1 a partial longitudinal section of a gas turbine compressor is shown. Between the stator 1 and the impeller 2 of the compressor, a circumferential removal slot 4 is arranged in the gas turbine housing 3, which opens into a removal plenum 5. The withdrawal plenum 5 is in turn connected to the withdrawal tube 6. The entry area of the removal slot 4 has a constant height. A mini guide vane 7 is arranged there. The part of the removal slot 4 that follows is designed as a diagonal diffuser 8.
  • the flow at the entry into the removal slot 4 is axially aligned by the mini guide vane 7. This becomes the peripheral component of the flow rate converted to static pressure and the total pressure loss is reduced.
  • the mini guide vane has a particularly favorable effect when there is a strong swirl in the current.
  • the removal slot 4 can be designed over the entire length as a divergent channel, at the end of which the mini guide vane is arranged.
  • FIG. 2 Another embodiment of the invention is shown in FIG. 2.
  • the mini guide vane 7 is designed here together with the guide vane of the compressor.
  • the stator 1 of the compressor is divided. The lower part is used to deflect the compressor, while the upper part represents the mini guide vane 7 for deflecting the flow in the axial direction. Since the guide grille of the compressor does not usually deflect in the axial direction, the guide grille and the mini guide grille 7 have different deflection angles.
  • the number of blades of guide and mini guide grid 7 can also be different.
  • the circumferential component of the impeller outflow in the compressor is converted into static pressure and the total pressure loss is minimized.
  • FIGS. 3 and 4 A fourth embodiment is shown in FIGS. 3 and 4.
  • the removal slot 4 is not designed as usual in the combination of the removal slot 4 / removal plenum 5 (see FIGS. 1 and 2), but the removal slot 4 designed as a diagonal diffuser 8 merges into a spiral 9.
  • This spiral 9 opens directly into the sampling tube 6. This also means that part of the peripheral component of the flow velocity is converted into static pressure with little loss, and another part becomes the transport component. The total pressure loss is reduced and, moreover, there is no outlet loss of the flow which occurs during the transition into the plenum 5 would. The efficiency of the system is thus increased compared to the prior art. If a spiral 9 is used, the mini guide vane 7 can be dispensed with.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

In an axial-flow compressor, the device for bleeding off secondary air, employing a revolving offtake slot which is designed, at least in part, as a diagonal diffuser, is characterised in that means are arranged, in or directly at the offtake slot (4), which utilise the kinetic energy of the circumferential component of the flow velocity. This may be, e.g., a small set of guide baffles (7) which is integrated into the offtake slot (4) or an offtake slot (4) which is designed as a diagonal diffuser (8) and merges into a spiral volute (9), the spiral (9) debouching directly into the offtake pipe (6). These arrangements minimise the total pressure head loss and increase the efficiency of the installation. <IMAGE>

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Vorrichtung zur Sekundärluftentnahme aus einem Axialverdichter, wobei zur Entnahme ein umlaufender Schlitz dient.The invention relates to a device for extracting secondary air from an axial compressor, a circumferential slot being used for the removal.

Stand der TechnikState of the art

Sekundärluft wird bei Verdichtern zur Kühlluftversorgung der Turbine entnommen. Je nach Kühlaufgabe ist ein bestimmter Totaldruck notwendig. Zur Entnahme der Sekundärluft dient meist ein umlaufender Schlitz. Die entnommene Luft gelangt durch den Entnahmeschlitz in das Entnahmeplenum und von dort aus über das Entnahmerohr in das Kühlsystem der Turbine. Leider geht ein grosser Teil des dynamischen Druckes bei der Entnahme verloren.Secondary air is taken from the turbine to supply cooling air to the compressors. Depending on the cooling task, a certain total pressure is necessary. A peripheral slot is usually used to extract the secondary air. The extracted air passes through the extraction slot into the extraction plenum and from there via the extraction pipe into the cooling system of the turbine. Unfortunately, a large part of the dynamic pressure is lost during removal.

Die Kriterien für die Optimierung des Entnahmeschlitzes sind sehr widersprüchlich, da einerseits die Strömung im Entnahmeschlitz optimiert werden muss, andererseits die Strömung im beschaufelten Ringraum des Verdichters nicht gestört werden darf. Dieses Problem ist besonders gross, wenn der Entnahmeschlitz auch als Ausblasesystem beim An- und Abstellen des Verdichters benutzt wird.The criteria for optimizing the discharge slot are very contradictory, since on the one hand the flow in the discharge slot must be optimized, and on the other hand the flow in the bladed annular space of the compressor must not be disturbed. This problem is particularly great if the removal slot is also used as a blow-out system when starting and stopping the compressor.

Es wurden deshalb verschiedene Formen für derartige Verbindungen zwischen dem Hauptkanal und dem Ausblasesystem entwikkelt, so z.B. Schlitze unterschiedlicher Formen, hohle Leitschaufeln und Öffnungen in den Grundplatten an den Leitschaufelfüssen.Various forms have therefore been developed for such connections between the main duct and the blow-out system, e.g. Slots of different shapes, hollow guide vanes and openings in the base plates on the guide vane feet.

Betrachtet man die am häufigsten verwendeten Entnahmeschlitze, so stellt man fest, dass je nach Geometrie des Schlitzes (vor allem Öffnungswinkel des Entnahmeschlitzes und Neigungswinkel des Schlitzes zur Verdichterachse) zwar ein Teil der Axialkomponente der Strömungsgeschwindigkeit genutzt werden kann, jedoch die Umfangskomponente fast vollständig dissipiert. Bei modernen Verdichtern ist aber gerade der Energieinhalt der Umfangskomponente sehr gross, so dass dies zu bedeutenden Totaldruckverlusten führt. Die Druckverluste sind u.a. direkt proportional dem Quadrat der Umfangskomponente der Strömungsgeschwindigkeit im Verdichter.If one looks at the most frequently used extraction slots, it is found that depending on the geometry of the slot (especially the opening angle of the extraction slot and the angle of inclination of the slot to the compressor axis), part of the axial component of the flow velocity can be used, but the circumferential component almost completely dissipates. With modern compressors, however, the energy content of the peripheral component is very large, so that this leads to significant total pressure losses. The pressure losses include directly proportional to the square of the circumferential component of the flow velocity in the compressor.

Darstellung der ErfindungPresentation of the invention

Die Erfindung versucht, diesen Nachteil zu vermeiden. Ihr liegt die Aufgabe zugrunde, eine Vorrichtung zur Sekundärluftentnahme aus einem Axialverdichter unter Verwendung eines umlaufenden Entnahmeschlitzes, welcher zumindestens teilweise als Diagonaldiffusor ausgebildet ist, zu schaffen, bei der der Totaldruckverlust minimiert wird.The invention tries to avoid this disadvantage. It is the object of the invention to provide a device for taking secondary air from an axial compressor using a circumferential removal slot, which is at least partially designed as a diagonal diffuser, in which the total pressure loss is minimized.

Erfindungsgemäss wird dies dadurch erreicht, dass bei der Vorrichtung gemäss Oberbegriff des Anspruches 1 im oder unmittelbar am Entnahmeschlitz Mittel angeordnet sind, welche die kinetische Energie der Umfangskomponente der Strömungsgeschwindigkeit nutzbar machen.This is achieved according to the invention in that, in the device according to the preamble of claim 1, means are arranged in or directly at the removal slot which make the kinetic energy of the peripheral component of the flow velocity usable.

Die Vorteile der Erfindung sind darin zu sehen, dass durch Umwandlung der Umfangskomponente der Lauf- oder Leitradabströmung im Verdichter in statischen Druck der Totaldruckverlust minimiert und dadurch der Wirkungsgrad der Anlage erhöht wird.The advantages of the invention can be seen in that by converting the peripheral component of the impeller or stator outflow The total pressure loss in the compressor in static pressure is minimized, thereby increasing the efficiency of the system.

Es ist besonders zweckmässig, wenn das Mittel zur Umwandlung der kinetischen Energie der Umfangskomponente der Strömungsgeschwindigkeit ein Mini-Leitgitter ist, welches direkt in dem eine konstante Höhe aufweisenden Eintrittsbereich des Entnahmeschlitzes angeordnet ist. Die Umfangsgeschwindigkeit wird dadurch in statischen Druck umgewandelt und somit der Totaldruckverlust minimiert.It is particularly expedient if the means for converting the kinetic energy of the peripheral component of the flow velocity is a mini-baffle which is arranged directly in the entry region of the removal slot which has a constant height. The circumferential speed is thereby converted into static pressure and thus the total pressure loss is minimized.

Ferner ist es vorteilhaft, wenn das Mini-Leitgitter am Eintritt des Entnahmeschlitzes auf dem Verdichterleitrad angeordnet ist, wobei das Leitgitter des Verdichters und das Mini-Leitgitter unterschiedliche Umlenkwinkel und/oder unterschiedliche Schaufelzahlen aufweisen können.Furthermore, it is advantageous if the mini guide vane is arranged on the compressor guide wheel at the entry of the removal slot, the guide guide of the compressor and the mini guide guide having different deflection angles and / or different numbers of blades.

Weiterhin ist es zweckmässig, wenn das Mini-Leitgitter am Ende des über die gesamte Länge divergenten Entnahmeschlitzes angeordnet ist.Furthermore, it is expedient if the mini guide vane is arranged at the end of the removal slot which is divergent over the entire length.

Schliesslich wird mit Vorteil der Entnahmeschlitz als Diagonaldiffusor ausgelegt, welcher in eine Spirale übergeht, wobei die Spirale direkt in das Entnahmerohr mündet. Dadurch wird ein Teil der Umfangsgeschwindigkeit in statischen Druck umgewandelt und ein Teil der Umfangsgeschwindigkeit wird zur Transportkomponente.Finally, the extraction slot is advantageously designed as a diagonal diffuser, which merges into a spiral, the spiral opening directly into the extraction tube. As a result, part of the peripheral speed is converted into static pressure and part of the peripheral speed becomes a transport component.

Kurze Beschreibung der ZeichnungBrief description of the drawing

In der Zeichnung sind drei Ausführungsbeispiele der Erfindung anhand eines einwelligen axialdurchströmten Gasturbinen-Verdichters dargestellt.In the drawing, three exemplary embodiments of the invention are shown using a single-shaft gas turbine compressor with axial flow.

Es zeigen:

Fig. 1
einen Teillängsschnitt des Gasturbinen-Verdichters mit einem Mini-Leitgitter im Einlaufschlitz;
Fig. 2
einen Teillängsschnitt des Gasturbinen-Verdichters mit einem Mini-Leitgitter auf dem Verdichterleitrad;
Fig. 3
einen Teillängschnitt des Gasturbinen-Verdichters mit einem als Diagonaldiffusor ausgelegten Entnahmeschlitz, welcher in eine Spirale übergeht, wobei die Spirale direkt in das Entnahmerohr mündet;
Fig. 4
einen Teilquerschnitt (Schnitt A-B) durch Fig. 3.
Show it:
Fig. 1
a partial longitudinal section of the gas turbine compressor with a mini guide vane in the inlet slot;
Fig. 2
a partial longitudinal section of the gas turbine compressor with a mini guide vane on the compressor guide wheel;
Fig. 3
a partial longitudinal section of the gas turbine compressor with a removal slot designed as a diagonal diffuser, which merges into a spiral, the spiral opening directly into the extraction pipe;
Fig. 4
a partial cross section (section AB) through Fig. 3rd

Es sind nur die für das Verständnis der Erfindung wesentlichen Elemente gezeigt. Die Strömungsrichtung der Arbeitsmittel ist mit Pfeilen bezeichnet.Only the elements essential for understanding the invention are shown. The direction of flow of the work equipment is indicated by arrows.

Weg zur Ausführung der ErfindungWay of carrying out the invention

Nachfolgend wird die Erfindung anhand der Zeichnungen und mehrerer Ausführungsbeispiele näher erläutert.The invention is explained in more detail below with reference to the drawings and several exemplary embodiments.

In Fig. 1 ist ein Teillängsschnitt eines Gasturbinen-Verdichters dargestellt. Zwischen dem Leitrad 1 und dem Laufrad 2 des Verdichters ist im Gasturbinengehäuse 3 ein umlaufender Entnahmeschlitz 4 angeordnet, welcher in ein Entnahmeplenum 5 mündet. Das Entnahmeplenum 5 ist wiederum mit dem Entnahmerohr 6 verbunden. Der Eintrittsbereich des Entnahmeschlitzes 4 weist eine konstante Höhe auf. Dort ist ein Mini-Leitgitter 7 angeordnet. Der sich daran anschliessende Teil des Entnahmeschlitzes 4 ist als Diagonaldiffusor 8 ausgebildet.In Fig. 1 a partial longitudinal section of a gas turbine compressor is shown. Between the stator 1 and the impeller 2 of the compressor, a circumferential removal slot 4 is arranged in the gas turbine housing 3, which opens into a removal plenum 5. The withdrawal plenum 5 is in turn connected to the withdrawal tube 6. The entry area of the removal slot 4 has a constant height. A mini guide vane 7 is arranged there. The part of the removal slot 4 that follows is designed as a diagonal diffuser 8.

Bei Entnahme der Sekundärluft wird die Strömung am Eintritt in den Entnahmeschlitz 4 durch das Mini-Leitgitter 7 axial ausgerichtet. Damit wird die Umfangskomponente der Strömungsgeschwindigkeit in statischen Druck umgewandelt und der Totaldruckverlust wird verringert. Das Mini-Leitgitter wirkt sich besonders günstig aus, wenn in der Strömung ein starker Drall ist.When the secondary air is removed, the flow at the entry into the removal slot 4 is axially aligned by the mini guide vane 7. This becomes the peripheral component of the flow rate converted to static pressure and the total pressure loss is reduced. The mini guide vane has a particularly favorable effect when there is a strong swirl in the current.

Die optimale Position des Mini-Leitgitters ergibt sich bei der Feinauslegung. So kann in einem weiteren Ausführungsbeispiel der Entnahmeschlitz 4 über die ganze Länge als divergenter Kanal ausgebildet sein, an dessen Ende das Mini-Leitgitter angeordnet ist.The optimal position of the mini guide vane results from the fine design. In a further exemplary embodiment, the removal slot 4 can be designed over the entire length as a divergent channel, at the end of which the mini guide vane is arranged.

Ein anderes Ausführungsbeispiel der Erfindung ist in Fig. 2 dargestellt. Das Mini-Leitgitter 7 ist hier zusammen mit dem Leitgitter des Verdichters ausgeführt. Das Leitrad 1 des Verdichters ist geteilt. Der unterer Teil dient der Verdichterumlenkung, während der obere Teil das Mini-Leitgitter 7 für die Umlenkung der Strömung in axiale Richtung darstellt. Da das Leitgitter des Verdichters üblicherweise nicht in axiale Richtung umlenkt, haben das Leitgitter und das Mini-Leitgitter 7 unterschiedliche Umlenkwinkel. Die Schaufelzahlen von Leit- und Mini-Leitgitter 7 können ebenfalls unterschiedlich sein. Auch bei diesem Ausführungsbeispiel wird die Umfangskomponente der Laufradabströmung im Verdichter in statischen Druck umgewandelt und der Totaldruckverlust wird minimiert.Another embodiment of the invention is shown in FIG. 2. The mini guide vane 7 is designed here together with the guide vane of the compressor. The stator 1 of the compressor is divided. The lower part is used to deflect the compressor, while the upper part represents the mini guide vane 7 for deflecting the flow in the axial direction. Since the guide grille of the compressor does not usually deflect in the axial direction, the guide grille and the mini guide grille 7 have different deflection angles. The number of blades of guide and mini guide grid 7 can also be different. In this exemplary embodiment too, the circumferential component of the impeller outflow in the compressor is converted into static pressure and the total pressure loss is minimized.

Ein viertes Ausführungsbeispiel ist in den Fig. 3 und 4 abgebildet. Der Entnahmeschlitz 4 ist hier nicht wie üblich in der Kombination Entnahmeschlitz 4/Entnahmeplenum 5 (s. Fig. 1 bzw. 2) ausgeführt, sondern der als Diagonaldiffusor 8 ausgelegte Entnahmeschlitz 4 geht in eine Spirale 9 über. Diese Spirale 9 mündet direkt in das Entnahmerohr 6. Auch dadurch wird ein Teil der Umfangkomponente der Strömungsgeschwindigkeit verlustarm in statischen Druck umgewandelt, ein weiterer Teil wird zur Transportkomponente. Der Totaldruckverlust wird verringert und ausserdem entfällt der Auslassverlust der Strömung, der beim Übergang in das Entnahmeplenum 5 entstehen würde. Der Wirkungsgrad der Anlage wird somit im Vergleich zum Stand der Technik erhöht. Im Falle des Einsatzes einer Spirale 9 kann auf das Mini-Leitgitter 7 verzichtet werden.A fourth embodiment is shown in FIGS. 3 and 4. The removal slot 4 is not designed as usual in the combination of the removal slot 4 / removal plenum 5 (see FIGS. 1 and 2), but the removal slot 4 designed as a diagonal diffuser 8 merges into a spiral 9. This spiral 9 opens directly into the sampling tube 6. This also means that part of the peripheral component of the flow velocity is converted into static pressure with little loss, and another part becomes the transport component. The total pressure loss is reduced and, moreover, there is no outlet loss of the flow which occurs during the transition into the plenum 5 would. The efficiency of the system is thus increased compared to the prior art. If a spiral 9 is used, the mini guide vane 7 can be dispensed with.

BezugszeichenlisteReference list

11
LeitradDiffuser
22nd
LaufradWheel
33rd
GasturbinengehäuseGas turbine casing
44th
EntnahmeschlitzWithdrawal slot
55
EntnahmeplenumRemoval plenum
66
EntnahmerohrSampling tube
77
Mini-LeitgitterMini guide rail
88th
DiagonaldiffusorDiagonal diffuser
99
Spiralespiral

Claims (8)

Vorrichtung zur Sekundärluftentnahme aus einem Axialverdichter unter Verwendung eines umlaufenden Entnahmeschlitzes (4), welcher zumindestens teilweise als Diagonaldiffusor (8) ausgebildet ist, dadurch gekennzeichnet, dass im oder unmittelbar am Entnahmeschlitz (4) Mittel angeordnet sind, welche die kinetische Energie der Umfangskomponente der Strömungsgeschwindigkeit nutzbar machen.Device for extracting secondary air from an axial compressor using a circumferential removal slot (4), which is at least partially designed as a diagonal diffuser (8), characterized in that means are arranged in or directly on the removal slot (4) which measure the kinetic energy of the peripheral component of the flow velocity make useful. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Mittel zur Nutzbarmachung der Umfangskomponente der Strömungsgeschwindigkeit ein Mini-Leitgitter (7) ist.Apparatus according to claim 1, characterized in that the means for utilizing the peripheral component of the flow rate is a mini-baffle (7). Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Mini-Leitgitter (7) direkt in dem eine konstante Höhe aufweisenden Eintrittsbereich des Entnahmeschlitzes (4) integriert ist.Device according to claim 2, characterized in that the mini guide vane (7) is integrated directly in the entry region of the removal slot (4) which has a constant height. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Mini-Leitgitter (7) am Ende des über die gesamte Länge divergenten Entnahmeschlitzes (4) angeordnet ist.Apparatus according to claim 2, characterized in that the mini guide vane (7) is arranged at the end of the removal slot (4) which is divergent over the entire length. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Mini-Leitgitter (7) am Eintritt des Entnahmeschlitzes (4) auf dem Verdichterleitrad (1) angeordnet ist.Apparatus according to claim 2, characterized in that the mini guide vane (7) is arranged at the inlet of the removal slot (4) on the compressor guide wheel (1). Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Leitgitter des Verdichters und das Mini-Leitgitter (7) unterschiedliche Umlenkwinkel aufweisen.Apparatus according to claim 5, characterized in that the guide grille of the compressor and the mini guide grille (7) have different deflection angles. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das Leitgitter des Verdichters und das Mini-Leitgitter (7) unterschiedliche Schaufelzahlen aufweisen.Apparatus according to claim 5 or 6, characterized in that the guide vane of the compressor and the mini guide vane (7) have different blade numbers. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der als Diagonaldiffusor (8) ausgelegte Entnahmeschlitz (4) in eine Spirale (9) übergeht, wobei die Spirale (9) direkt in das Entnahmerohr (6) mündet.Device according to claim 1, characterized in that the removal slot (4) designed as a diagonal diffuser (8) merges into a spiral (9), the spiral (9) opening directly into the removal tube (6).
EP94111013A 1993-08-10 1994-07-15 Device for secondary air bleeding from an axial compressor Ceased EP0638725A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4326799A DE4326799A1 (en) 1993-08-10 1993-08-10 Device for extracting secondary air from an axial compressor
DE4326799 1993-08-10

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EP (1) EP0638725A1 (en)
JP (1) JPH0763199A (en)
DE (1) DE4326799A1 (en)

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EP2987967A1 (en) * 2014-08-20 2016-02-24 Siemens Aktiengesellschaft Compressor housing for a gas turbine
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DE19814627C2 (en) * 1998-04-01 2001-02-22 Man Turbomasch Ag Ghh Borsig Extraction of cooling air from the diffuser part of a compressor in a gas turbine
US6109868A (en) * 1998-12-07 2000-08-29 General Electric Company Reduced-length high flow interstage air extraction
US6231301B1 (en) 1998-12-10 2001-05-15 United Technologies Corporation Casing treatment for a fluid compressor
US6574965B1 (en) 1998-12-23 2003-06-10 United Technologies Corporation Rotor tip bleed in gas turbine engines
GB0206880D0 (en) * 2002-03-23 2002-05-01 Rolls Royce Plc A vane for a rotor arrangement for a gas turbine engine
US8292567B2 (en) * 2006-09-14 2012-10-23 Caterpillar Inc. Stator assembly including bleed ports for turbine engine compressor
US8950069B2 (en) * 2006-12-29 2015-02-10 Rolls-Royce North American Technologies, Inc. Integrated compressor vane casing
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DE4326799A1 (en) 1995-02-16

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