EP2250347B1 - Axial compressor with a device for redirecting a leakage flow - Google Patents

Axial compressor with a device for redirecting a leakage flow Download PDF

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Publication number
EP2250347B1
EP2250347B1 EP09714205.3A EP09714205A EP2250347B1 EP 2250347 B1 EP2250347 B1 EP 2250347B1 EP 09714205 A EP09714205 A EP 09714205A EP 2250347 B1 EP2250347 B1 EP 2250347B1
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EP
European Patent Office
Prior art keywords
rotor
outlet opening
stator
axial compressor
sealing element
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.)
Not-in-force
Application number
EP09714205.3A
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German (de)
French (fr)
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EP2250347A1 (en
Inventor
Sergio Elorza Gomez
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.)
MTU Aero Engines AG
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MTU Aero Engines AG
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Publication date
Application filed by MTU Aero Engines AG filed Critical MTU Aero Engines AG
Publication of EP2250347A1 publication Critical patent/EP2250347A1/en
Application granted granted Critical
Publication of EP2250347B1 publication Critical patent/EP2250347B1/en
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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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
    • 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
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • 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
    • F04D29/08—Sealings
    • F04D29/083—Sealings 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
    • 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
    • F04D29/542—Bladed diffusers
    • 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
    • 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
    • F05D2240/80—Platforms for stationary or moving blades
    • F05D2240/81—Cooled platforms

Definitions

  • Gas turbines may include a compressor in which a rotor may rotate relative to a stationary stator.
  • a seal arrangement called “inner air seal” can be used.
  • the reentry of this low energy leakage mass flow into the main passage of the compressor causes thickening of the hub boundary layer.
  • An axial compressor configured to reduce this effect is shown in the document EP1793089A2 , which represents the closest prior art to the present invention.
  • the present invention is based on the finding that the harmful effects of the leakage mass flow can be reduced or avoided if the leakage flow is blown farther upstream from the stator. This gives the leakage current more time to mix with a mainstream before it reaches the stator. In this way, the stator can be flown with a healthier boundary layer. Furthermore, the inventive approach offers the possibility that the leakage current can be injected with higher energy in the main flow, wherein the Einblaseraum can be varied and optimized. This improves mixing and makes the hub boundary layer thinner. In addition, the pulsating flow on the stator can have a stabilizing effect.
  • the harmful effects of the leakage flows in the area of the inner air seals can be reduced, in which the leakage flows are introduced further upstream.
  • the re-entry of the leakage mass flow can be optimized so that the reentry does not occur in the gap between the rotor and the stator platform.
  • An axial compressor according to the invention with a device for diverting a leakage current flowing between a stator and a rotor comprises a sealing element for interrupting the leakage flow, an outlet opening arranged on the rotor and a guide which is designed to bypass the leakage flow past the sealing element to the outlet opening respectively.
  • the guide can be designed to predetermine the leakage flow at the outlet opening a defined injection direction. By specifying a defined injection direction, the mixing of the leakage flow with the main flow can be optimized.
  • the guide may have a leading through a rotor platform of the rotor channel, which is connected to the outlet opening.
  • the channel can be easily integrated into an existing rotor platform.
  • a desired outflow direction and outflow energy of the leakage flow can be set through the channel.
  • the outlet opening can be arranged in a rotor platform of the rotor. As a result, the leakage flow upstream of the stator can be blown off.
  • the rotor may have an extension which is designed to bridge a radially extending between the rotor and stator gap, wherein the sealing element may be disposed at a stator end of the extension. In this way, a re-entry of the leakage current in the gap between the rotor and stator can be prevented.
  • the guide may be configured to guide the leakage current between a rotor shaft of the rotor and the extension along.
  • a radially lower portion of the extension can serve as a guide of the leakage current.
  • the sealing element adjacent to an inner shroud of the stator wherein a distance of the sealing element to a radially outer end of the inner shroud is greater than or equal to a distance of the sealing element to a radially inner end of the inner shroud.
  • the sealing element adjacent to an inner shroud of the stator, wherein a distance of the sealing element to a radially outer end of the inner cover strip is smaller than a distance of the sealing element to a radially inner end of the inner cover strip.
  • the outlet opening may be arranged in a hub surface and / or an end face of the rotor. In this way, an advantageous injection of the leakage current can be realized.
  • a distance of the outlet opening from a, the stator facing away from the edge of the hub surface may be greater than a distance of the outlet opening of a stator facing the edge of the hub surface.
  • the outlet opening can also be arranged on a side facing the stator edge of the hub surface.
  • the outlet opening can be arranged between two rotor blades of the rotor, wherein the outlet opening can be arranged closer to that of the two rotor blades, which is arranged with respect to a direction of rotation of the rotor behind the outlet opening.
  • the outlet opening may have a round cross section.
  • Such a cross section can be easily realized by a bore.
  • the outlet opening may be formed as a slot.
  • Such a configuration may be advantageous, for example, if the outlet opening is arranged at the edge of the rotor platform
  • the device may comprise at least one further arranged on the rotor outlet opening and at least one further guide, wherein the at least one further guide is formed to at least a portion of the leakage flow past the sealing element to the at least to lead a further outlet opening.
  • FIG. 1 shows a schematic representation of a device for the diversion of a flowing between a stator 102 and a rotor 104 leakage current 106 in a compressor according to the invention.
  • a flow of the leakage stream 106 is represented by a series of arrows. In order not to affect the clarity are in FIG. 1 only the first and the last arrow of the leakage stream 106 provided with reference numerals.
  • the device has a sealing element 112 for interrupting the leakage flow 106, an outlet opening 114 arranged on the rotor 104 and a guide 116.
  • the guide 116 is designed to guide the leakage flow 106 past the sealing element 112 to the outlet opening 114.
  • the rotor 104 With respect to a main flow that may be generated or amplified by a rotational movement of the rotor 104, the rotor 104 is located upstream with respect to the fixed stator 102.
  • the guide 116 can be formed in the region of the outlet opening 114 so that the leak from the outlet opening 1 14 leakage current 106 is predetermined, a predetermined Einblasraum.
  • the blowing-in direction has at least one first and one second directional component, wherein the first directional component points in the direction of the main flow and the second directional component points radially outward. Additionally, a perimeter component may be present.
  • the rotor 104 may include a plurality of rotor blades 122. In FIG. 1 only one rotor blade 122 is shown. The rotor blade 122 is disposed radially outwardly on a rotor platform 124. The rotor platform 124 may be coupled via a rotor shaft 126 to a further rotor 104b. The further rotor 104b also has rotor blades 122b, which are arranged on a further rotor platform 124b.
  • the rotor platform 124 has at least one slot 132.
  • the in FIG. 1 Slot 132 forms a channel through rotor platform 124. Slot 132 is part of guide 116 and is configured to direct leakage stream 106 to exit aperture 114 in rotor platform 124.
  • the stator 102 may include a plurality of stationary stator blades 142 connected to a stator inner shroud 144. In FIG. 1 Only a stator blade 142 is shown connected to the stator inner shroud 144. Between the stator inner shroud 144 and the rotor platform 124 there is a gap extending in the radial direction. According to the invention, entry of the leakage flow 106 into this gap is avoided.
  • the rotor platform 102 may have an attachment 134 for flow guidance.
  • the attachment 134 may be formed as an extension of the rotor platform with which the gap can be bridged and sealed.
  • the sealing element 112 can be arranged on a stator-side end of the extension 134.
  • the sealing member 112 may interrupt and redirect the leakage flow 106 cause the guide 116.
  • the leakage flow 106 can thus be guided past the sealing element 112, between the rotor shaft 126 and the extension 134, to the channel 132 in the rotor platform 124.
  • the sealing element 112 adjoins a radially inner shoulder of the stator inner cover tape 144.
  • the step is formed so that the sealing member 112 seals the gap between the rotor platform 124 and the stator inner shroud 144 in the vicinity of the rotor shaft 126.
  • a distance of the sealing element 112 to a radially outer end of the stator inner shroud 144 is greater than a distance of the sealing element 112 to a radially inner end of the stator inner shroud 144th
  • further sealing means 152 may be arranged in a circumferential gap between the rotor shaft 126 and the stator inner shroud 144.
  • FIG. 1 three further sealing devices 152 are shown.
  • the leakage flow 106 flows from a gap between the stator 102 and the further rotor 104b, past the further sealing means 152 in the direction of the sealing element 112.
  • the further sealing means 152 and for the sealing element 112 can be used any sealing arrangements which are used to seal the gap between the stator inner shroud 144 and the rotor shaft 126 are suitable.
  • FIG. 2 shows a further schematic representation of the in FIG. 1 shown rotor 104, the stator 102 and the other rotor 104b.
  • the rotors 104, 104b have a plurality of rotor blades 122, 122b.
  • the stator 102 has a plurality of stator blades 142.
  • an outlet opening 114 is arranged.
  • the outlet openings 114 may be arranged in a Rotomaben description of the rotor 104.
  • the outlet openings 114 are formed as rectangular slots.
  • the outlet openings 114 are disposed on that edge of the Rotomaben description, which faces the stator 102.
  • the outlet openings 114 may be arranged between two rotor blades 122 so that an outlet opening 114 is arranged in each case closer to that of the two adjacent rotor blades 122 that is arranged behind the outlet opening 114 with respect to a direction of rotation 152 of the rotor.
  • FIG. 3 shows a schematic representation of the device according to another embodiment of a compressor according to the invention. This in FIG. 3 embodiment shown differs from that in FIG. 1 shown exemplary embodiment in the constructive implementation of the guide 132 of the leakage current 106th Elements that do not differ from the in FIG. 1 different embodiment shown are not described again in the following.
  • the sealing element 112 in turn adjoins a shoulder of the stator inner cover tape 144.
  • the shoulder is configured so that the sealing member 112 seals the gap between the rotor platform 124 and the stator inner shroud 144 near the radially outer end of the stator inner shroud 144.
  • a distance of the sealing member 112 to a radially outer end of the stator inner shroud 144 is smaller than a distance of the sealing member 112 to a radially inner end of the stator inner shroud 144.
  • the leakage current 106 may be within a cavity between the rotor shaft 126 and the extension 134 of the rotor platform 124 are guided to the channel 132.
  • the channel 132 may be configured as a bore for a guided leakage outflow.
  • the outlet opening 114 of the channel 132 may be disposed on the hub surface and / or the end surface of the rotor platform 134, wherein a flow component opposite to the main flow direction is possible (see dashed, dot-dash line and dash-dotted line illustration).
  • FIG. 4 shows, according to the FIG. 2 , another schematic representation of the in FIG. 3 shown rotor 104, the stator 102 and the other rotor 104b.
  • the outlet openings 114 may have a round cross-section.
  • the exit openings 114 may be spaced from the rim of the rotor hub. In this case, a distance of the outlet openings 114 from one, the stator 102 facing away from the edge of the rotor hub be greater than a distance of the outlet opening of the stator 102 facing edge of the rotor hub.
  • the method allows diversion of the leakage stream 106 by interrupting flow of the leakage stream 106 in the gap between the stator inner shroud 144 and the rotor platform 124 by means of the sealing member 112 and the leakage flow instead is disposed past the sealing member 112 to that on the rotor 102 Outlet opening 114 is guided.
  • leakage flows 106 may be introduced further upstream in the region of the inner air seals 152.
  • the leakage mass flow 106 can be redirected through channels 116, 132 which can pass under the last sealing tip 112 to openings 114 of the upstream rotor 104.
  • circumference-discrete blow-off of the cavity mass flow 106 via the rotor platform 124 from axial compressors can take place to improve the flow quality at the stator hub.
  • a compressor has a plurality of rotor-stator pairs, then the approach according to the invention can be applied to any rotor-stator pair.
  • the exemplary embodiments shown are chosen merely by way of example and can be combined with one another.
  • the described elements, their shape and their arrangement can be changed within the scope of the inventive approach.
  • a number and arrangement of the outlet openings can be changed.
  • those elements adaptable that allow a variation and optimization of the injection direction of the leakage current are not limited to the application described in connection with an inner shroud of a stator, but can generally be used inside and outside the present invention for guiding leakage currents that occur in the boundary region between static and moving assemblies.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Synchronous Machinery (AREA)
  • Motor Or Generator Frames (AREA)

Description

Die vorliegende Erfindung betrifft einen axialen Verdichter nach dem Oberbegriff von Anspruch 1.
Gasturbinen können einen Verdichter aufweisen, in dem ein Rotor gegenüber einem feststehenden Stator rotieren kann. Um Leckageströmungen zwischen dem rotierenden Rotor und einem Innendeckband des feststehenden Stators zu minimieren kann eine als "inner air seal" bezeichnete Dichtungsanordnung eingesetzt werden. Trotz einer solchen Dichtungsanordnung ist es unvermeidlich, dass unter den Innendeckbändern von Verdichterstatoren eine relativ kleine Menge Luft zurückfließt. Der Wiedereintritt dieses niederenergetischen Leckage-Massenstromes in den Hauptkanal des Verdichters verursacht eine Aufdickung der Nabengrenzschicht. Dadurch werden die Stabilität des Verdichters und sein Wirkungsgrad beeinträchtigt. Einen axialen Verdichter, der zur Reduzierung dieses Effektes konfiguriert ist, zeigt das Dokument EP1793089A2 , welches den nächstliegenden Stand der Technik gegenüber der vorliegenden Erfindung darstellt.The present invention relates to an axial compressor according to the preamble of claim 1.
Gas turbines may include a compressor in which a rotor may rotate relative to a stationary stator. In order to minimize leakage flow between the rotating rotor and an inner shroud of the stationary stator, a seal arrangement called "inner air seal" can be used. Despite such a sealing arrangement, it is inevitable that a relatively small amount of air will flow back under the inner shrouds of compressor stators. The reentry of this low energy leakage mass flow into the main passage of the compressor causes thickening of the hub boundary layer. As a result, the stability of the compressor and its efficiency are impaired. An axial compressor configured to reduce this effect is shown in the document EP1793089A2 , which represents the closest prior art to the present invention.

Um den schädlichen Effekt des Leckage-Massenstromes zu reduzieren kann eine Minimierung dieses Massenstroms angestrebt werden. Dazu können effektivere Dichtsysteme eingebaut werden. Eine minimale Leckage ist jedoch notwendig und unvermeidbar, damit der Rotor sich nicht zu sehr aufheizt.
Es ist daher die Aufgabe der vorliegenden Erfindung einen Verdichter mit einer Vorrichtung zur Umleitung eines, zwischen einem Stator und einem Rotor fließenden Leckagestroms bereitzustellen, welcher die unerwünschten Effekte des Leckagestroms reduzieren kann.
Es sei an dieser Stelle auf die Druckschriften US 3 291 447 und JP 60 159304 hingewiesen, welche jedoch keinen Verdichter sondern eine Turbine, die einen negativen Druckgradienten entlang des Rotors und Stators realisieren und zusätzlich besonderen Kühlbedarf haben. Ferner sei auf die Druckschrift US 4 152 092 A hingewiesen, die jedoch keinen axialen Verdichter sondern eine radiale Turbine bzw. einen radialen Verdichter offenbaren.In order to reduce the harmful effect of the leakage mass flow, a minimization of this mass flow can be sought. For this purpose, more effective sealing systems can be installed. However, minimal leakage is necessary and unavoidable so that the rotor does not overheat.
It is therefore the object of the present invention to provide a compressor with a device for the diversion of a leakage current flowing between a stator and a rotor, which can reduce the undesired effects of the leakage current.
It is at this point on the pamphlets US 3,291,447 and JP 60 159304 pointed, which, however, no compressor but a turbine, which realize a negative pressure gradient along the rotor and stator and in addition special cooling needs to have. Further, let the publication US 4 152 092 A which, however, disclose no axial compressor but a radial turbine or a radial compressor.

Gelöst werden diese Aufgaben durch einen axialen Verdichter gemäß den Merkmalen des Anspruchs 1.These objects are achieved by an axial compressor according to the features of claim 1.

Vorteilhafte Ausgestaltungen der Erfindung sind in den jeweiligen Unteransprüchen beschrieben.Advantageous embodiments of the invention are described in the respective subclaims.

Der vorliegenden Erfindung liegt die Erkenntnis zu Grunde, dass die schädlichen Effekte des Leckage-Massenstroms reduziert oder vermieden werden können, wenn der Leckagestrom weiter stromauf vom Stator abgeblasen wird. Dadurch erhält der Leckagestrom mehr Zeit zum Durchmischen mit einer Hauptströmung, bevor er den Stator erreicht. Auf diese Weise kann der Stator mit einer gesünderen Grenzschicht angeströmt werden. Ferner bietet der erfindungsgemäße Ansatz die Möglichkeit, dass der Leckagestrom mit höherer Energie in die Hauptströmung eingeblasen werden kann, wobei die Einblaserichtung variierbar und optimierbar ist. Damit kann die Durchmischung verbessert und die Nabengrenzschicht dünner werden. Zusätzlich kann sich die pulsierende Strömung auf den Stator stabilisierend auswirken.The present invention is based on the finding that the harmful effects of the leakage mass flow can be reduced or avoided if the leakage flow is blown farther upstream from the stator. This gives the leakage current more time to mix with a mainstream before it reaches the stator. In this way, the stator can be flown with a healthier boundary layer. Furthermore, the inventive approach offers the possibility that the leakage current can be injected with higher energy in the main flow, wherein the Einblaserichtung can be varied and optimized. This improves mixing and makes the hub boundary layer thinner. In addition, the pulsating flow on the stator can have a stabilizing effect.

Erfindungsgemäß lassen sich die schädlichen Effekte der Leckageströmungen im Bereich der Inner Air Seals reduzieren, in dem die Leckageströmungen wieder weiter stromaufwärts eingebracht werden. Auf diese Weise kann der Wiedereintritt des Leckagenmassenstroms so optimiert werden, das der Wiedereintritt nicht in dem Spalt zwischen der Rotor- und der Statorplattform erfolgt.According to the invention, the harmful effects of the leakage flows in the area of the inner air seals can be reduced, in which the leakage flows are introduced further upstream. In this way, the re-entry of the leakage mass flow can be optimized so that the reentry does not occur in the gap between the rotor and the stator platform.

Ein erfindungsgemäßer axialer Verdichter mit einer Vorrichtung zur Umleitung eines zwischen einem Stator und einem Rotor fließenden Leckagestroms umfasst ein Dichtelement zum Unterbrechen des Leckagestroms, eine an dem Rotor angeordneten Austrittsöffnung und eine Führung, die ausgebildet ist, um den Leckagestrom an dem Dichtelement vorbei zu der Austrittsöffnung zu führen.An axial compressor according to the invention with a device for diverting a leakage current flowing between a stator and a rotor comprises a sealing element for interrupting the leakage flow, an outlet opening arranged on the rotor and a guide which is designed to bypass the leakage flow past the sealing element to the outlet opening respectively.

In einer vorteilhaften Ausgestaltung der erfindungsgemäßen Vorrichtung kann die Führung ausgebildet sein, um dem Leckagestrom an der Austrittsöffnung eine definierte Einblasrichtung vorzugeben, Durch die Vorgabe einer definierten Einblasrichtung kann die Durchmischung des Leckagestroms mit der Hauptströmung optimiert werden.In an advantageous embodiment of the device according to the invention, the guide can be designed to predetermine the leakage flow at the outlet opening a defined injection direction. By specifying a defined injection direction, the mixing of the leakage flow with the main flow can be optimized.

Ferner kann die Führung einen durch eine Rotorplattform des Rotors führenden Kanal aufweisen, der mit der Austrittsöffnung verbunden ist. Der Kanal lässt sich gut in eine bestehende Rotorplattform integrieren. Zudem kann durch den Kanal eine gewünschte Ausströmrichtung und Ausströmenergie des Leckagestroms eingestellt werden.Furthermore, the guide may have a leading through a rotor platform of the rotor channel, which is connected to the outlet opening. The channel can be easily integrated into an existing rotor platform. In addition, a desired outflow direction and outflow energy of the leakage flow can be set through the channel.

Beispielsweise kann die Austrittsöffnung in einer Rotorplattform des Rotors angeordnet sein. Dadurch lässt sich der Leckagestrom stromaufwärts vom Stator abblasen.For example, the outlet opening can be arranged in a rotor platform of the rotor. As a result, the leakage flow upstream of the stator can be blown off.

In einer vorteilhaften Ausgestaltung des erfindungsgemäßen Verdichters kann der Rotor einen Fortsatz aufweisen, der ausgebildet ist, um einen sich in radialer Richtung zwischen Rotor und Stator erstreckenden Spalt zu überbrücken, wobei das Dichtelement an einem statorseitigen Ende des Fortsatzes angeordnet sein kann. Auf diese Weise lässt sich ein Wiedereintreten des Leckagestroms in den Spalt zwischen Rotor und Stator verhindern.In an advantageous embodiment of the compressor according to the invention, the rotor may have an extension which is designed to bridge a radially extending between the rotor and stator gap, wherein the sealing element may be disposed at a stator end of the extension. In this way, a re-entry of the leakage current in the gap between the rotor and stator can be prevented.

Die Führung kann ausgebildet sein, um den Leckagestrom zwischen einer Rotorwelle des Rotors und dem Fortsatz entlang zu führen. Somit kann ein radial unten liegender Bereich des Fortsatzes als Führung des Leckagestroms dienen.The guide may be configured to guide the leakage current between a rotor shaft of the rotor and the extension along. Thus, a radially lower portion of the extension can serve as a guide of the leakage current.

Beispielsweise kann das Dichtelement an ein Innendeckband des Stators angrenzen, wobei ein Abstand des Dichtelements zu einem radial außen liegenden Ende des Innendeckbands größer ist als ein oder gleich groß wie ein Abstand des Dichtelements zu einem radial innen liegenden Ende des Innendeckbands.For example, the sealing element adjacent to an inner shroud of the stator, wherein a distance of the sealing element to a radially outer end of the inner shroud is greater than or equal to a distance of the sealing element to a radially inner end of the inner shroud.

Alternativ kann das Dichtelement an ein Innendeckband des Stators angrenzen, wobei ein Abstand des Dichtelements zu einem radial außen liegenden Ende des Innendeckbands kleiner ist als ein Abstand des Dichtelements zu einem radial innen liegenden Ende des Innendeckbands.Alternatively, the sealing element adjacent to an inner shroud of the stator, wherein a distance of the sealing element to a radially outer end of the inner cover strip is smaller than a distance of the sealing element to a radially inner end of the inner cover strip.

In einer vorteilhaften Ausgestaltung des erfindungsgemäßen Verdichters kann die Austrittsöffnung in einer Nabenfläche und/oder einer Stirnfläche des Rotors angeordnet sein. Auf diese Weise lässt sich eine vorteilhafte Einblasung des Leckagestroms realisieren.In an advantageous embodiment of the compressor according to the invention, the outlet opening may be arranged in a hub surface and / or an end face of the rotor. In this way, an advantageous injection of the leakage current can be realized.

Dabei kann ein Abstand der Austrittsöffnung von einem, dem Stator abgewandten Rand der Nabenfläche größer sein, als ein Abstand der Austrittsöffnung von einem dem Stator zugewandten Rand der Nabenfläche.In this case, a distance of the outlet opening from a, the stator facing away from the edge of the hub surface may be greater than a distance of the outlet opening of a stator facing the edge of the hub surface.

Beispielsweise kann die Austrittsöffnung auch an einem dem Stator zugewandten Rand der Nabenfläche angeordnet sein.For example, the outlet opening can also be arranged on a side facing the stator edge of the hub surface.

Ferner kann die Austrittsöffnung zwischen zwei Rotorblättern des Rotors angeordnet sein, wobei die Austrittsöffnung näher an demjenigen der zwei Rotorblätter angeordnet sein kann, dass in Bezug auf eine Drehrichtung des Rotors hinter der Austrittsöffnung angeordnet ist.Furthermore, the outlet opening can be arranged between two rotor blades of the rotor, wherein the outlet opening can be arranged closer to that of the two rotor blades, which is arranged with respect to a direction of rotation of the rotor behind the outlet opening.

Beispielsweise kann die Austrittsöffnung einen runden Querschnitt aufweisen. Ein solcher Querschnitt lässt sich einfach durch eine Bohrung realisieren.For example, the outlet opening may have a round cross section. Such a cross section can be easily realized by a bore.

Alternativ kann die Austrittsöffnung als ein Schlitz ausgebildet sein. Eine solche Ausformung kann beispielsweise vorteilhaft sein, wenn die Austrittsöffnung am Rand der Rotor-plattform angeordnet istAlternatively, the outlet opening may be formed as a slot. Such a configuration may be advantageous, for example, if the outlet opening is arranged at the edge of the rotor platform

In einer vorteilhaften Ausgestaltung des erfindungsgemäßen Verdichters kann die Vorrichtung mindestens eine weitere an dem Rotor angeordnete Austrittsöffnung und mindestens eine weitere Führung aufweisen, wobei die mindestens eine weitere Führung ausgebildet ist, um zumindest einen Teil des Leckagestroms an dem Dichtelement vorbei zu der mindestens einen weiteren Austrittsöffnung zu führen. Somit lässt sich ein Wiedereintritt des Leckagestroms gleichmäßig verteilen.In an advantageous embodiment of the compressor according to the invention, the device may comprise at least one further arranged on the rotor outlet opening and at least one further guide, wherein the at least one further guide is formed to at least a portion of the leakage flow past the sealing element to the at least to lead a further outlet opening. Thus, a re-entry of the leakage flow can be evenly distributed.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines zeichnerisch dargestellten Ausführungsbeispiels. Dabei zeigt

  • Figur 1 eine schematische Darstellung einer Vorrichtung zur Umleitung eines zwischen einem Stator und einem Rotor fließenden Leckagestroms 106 eines erfindungsgemäßen Verdichters;
  • Figur 2 eine weitere schematische Darstellung der in Figur 1 gezeigten Vorrichtung;
  • Figur 3 eine schematische Darstellung einer weiteren Vorrichtung in einem erfindungsgemäßen Verdichter; und
  • Figur 4 eine weitere schematische Darstellung der in Figur 3 gezeigten Vorrichtung.
Further advantages, features and details of the invention will become apparent from the following description of a drawing illustrated embodiment. It shows
  • FIG. 1 a schematic representation of a device for diverting a flowing between a stator and a rotor leakage current 106 of a compressor according to the invention;
  • FIG. 2 another schematic representation of in FIG. 1 shown device;
  • FIG. 3 a schematic representation of another device in a compressor according to the invention; and
  • FIG. 4 another schematic representation of in FIG. 3 shown device.

Gleiche oder ähnliche Elemente sind in den Figuren mit denselben Referenzzeichen bezeichnet.The same or similar elements are indicated in the figures with the same reference numerals.

Figur 1 zeigt eine schematische Darstellung einer Vorrichtung zur Umleitung eines zwischen einem Stator 102 und einem Rotor 104 fließenden Leckagestroms 106in einem erfindungsgemäßen Verdichter. Ein Fluss des Leckagestroms 106 ist durch eine Folge von Pfeilen dargestellt. Um die Übersichtlichkeit nicht zu beeinträchtigen sind in Figur 1 lediglich der erste und der letzte Pfeil des Leckagestroms 106 mit Bezugszeichen versehen. FIG. 1 shows a schematic representation of a device for the diversion of a flowing between a stator 102 and a rotor 104 leakage current 106 in a compressor according to the invention. A flow of the leakage stream 106 is represented by a series of arrows. In order not to affect the clarity are in FIG. 1 only the first and the last arrow of the leakage stream 106 provided with reference numerals.

Die Vorrichtung weist ein Dichtelement 112 zum Unterbrechen des Leckagestroms 106, eine an dem Rotor 104 angeordnete Austrittsöffnung 114 und eine Führung 116 auf. Die Führung 116 ist ausgebildet, um den Leckagestrom 106 an dem Dichtelement 112 vorbei zu der Austrittsöffnung 114 zu führen. In Bezug auf eine Hauptströmung, die durch eine Drehbewegung des Rotors 104 erzeugt oder verstärkt werden kann, ist der Rotor 104 in Bezug auf den feststehenden Stator 102 stromaufwärts angeordnet. Die Führung 116 kann im Bereich der Austrittsöffnung 114 so ausgebildet sein, dass dem aus der Austrittsöffnung 1 14 austretenden Leckagestrom 106 eine vorbestimmte Einblasrichtung vorgegeben wird. Gemäß diesem Ausfuhrungsbeispiel weist die Einsblasrichtung zumindest eine erste und eine zweite Richtungskomponente auf, wobei die erste Richtungskomponente in Richtung der Hauptströmung und die zweite Richtungskomponente radial nach außen weist. Zusätzlich kann eine Umfangskomponente vorhanden sein.The device has a sealing element 112 for interrupting the leakage flow 106, an outlet opening 114 arranged on the rotor 104 and a guide 116. The guide 116 is designed to guide the leakage flow 106 past the sealing element 112 to the outlet opening 114. With respect to a main flow that may be generated or amplified by a rotational movement of the rotor 104, the rotor 104 is located upstream with respect to the fixed stator 102. The guide 116 can be formed in the region of the outlet opening 114 so that the leak from the outlet opening 1 14 leakage current 106 is predetermined, a predetermined Einblasrichtung. According to this exemplary embodiment, the blowing-in direction has at least one first and one second directional component, wherein the first directional component points in the direction of the main flow and the second directional component points radially outward. Additionally, a perimeter component may be present.

Der Rotor 104 kann eine Mehrzahl von Rotorblättern 122 aufweisen. In Figur 1 ist lediglich ein Rotorblatt 122 dargestellt. Das Rotorblatt 122 ist radial nach außen zeigend auf einer Rotorplattform 124 angeordnet. Die Rotorplattform 124 kann über eine Rotorwelle 126 mit einem weiteren Rotor 104b gekoppelt sein. Der weitere Rotor 104b weist ebenfalls Rotorblätter 122b auf, die auf einer weiteren Rotorplattform 124b angeordnet sind. Die Rotoren 104, 104b können als Blisk (BLiSKs = Bladed Disks) ausgeführt sein. Bei einem Blisk bilden die Schaufeln und die Scheiben eine Einheit und werden nicht mehr getrennt voneinander hergestellt.The rotor 104 may include a plurality of rotor blades 122. In FIG. 1 only one rotor blade 122 is shown. The rotor blade 122 is disposed radially outwardly on a rotor platform 124. The rotor platform 124 may be coupled via a rotor shaft 126 to a further rotor 104b. The further rotor 104b also has rotor blades 122b, which are arranged on a further rotor platform 124b. The rotors 104, 104b may be designed as blisk (BLiSKs = bladed disks). In a blisk, the blades and discs form a unit and are no longer produced separately.

Gemäß diesem Ausführungsbeispiel weist die Rotorplattform 124 mindestens einen Schlitz 132 auf. Der in Figur 1 gezeigte Schlitz 132 formt einen Kanal durch die Rotorplattform 124. Der Schlitz 132 ist ein Teil der Führung 116 und ist ausgebildet, um den Leckagestrom 106 zu der Austrittsöffnung 114 in der Rotorplattform 124 zu führen.According to this embodiment, the rotor platform 124 has at least one slot 132. The in FIG. 1 Slot 132 forms a channel through rotor platform 124. Slot 132 is part of guide 116 and is configured to direct leakage stream 106 to exit aperture 114 in rotor platform 124.

Der Stator 102 kann eine Mehrzahl von feststehenden Statorschaufeln 142 aufweisen, die mit einem Stator-Innendeckband 144 verbunden sind. In Figur 1 ist lediglich eine Statorschaufel 142 gezeigt, die mit dem Stator-Innendeckband 144 verbunden ist. Zwischen dem Stator-Innendeckband 144 und der Rotorplattform 124 ist ein sich in radialer Richtung erstreckender Spalt vorhanden. Erfindungsgemäß wird ein Eintritt des Leckagestroms 106 in diesen Spalt vermieden. Dazu kann die Rotorplattform 102 einen Aufsatz 134 zur Strömungsführung aufweisen. Der Aufsatz 134 kann als Fortsatz der Rotorplattform ausgebildet sein, mit dem sich der Spalt überbrücken und abdichten lässt. Um den Spalt abzudichten kann das Dichtelement 112 an einem statorseitigen Ende des Fortsatzes 134 angeordnet sein. Somit kann das Dichtelement 112 eine Unterbrechung und Umleitung des Leckagestroms 106 in die Führung 116 bewirken. Der Leckagestrom 106 kann somit an dem Dichtelement 112 vorbei, zwischen der Rotorwelle 126 und dem Fortsatz 134 entlang, zu dem Kanal 132 in der Rotorplattform 124 geführt werden.The stator 102 may include a plurality of stationary stator blades 142 connected to a stator inner shroud 144. In FIG. 1 Only a stator blade 142 is shown connected to the stator inner shroud 144. Between the stator inner shroud 144 and the rotor platform 124 there is a gap extending in the radial direction. According to the invention, entry of the leakage flow 106 into this gap is avoided. For this purpose, the rotor platform 102 may have an attachment 134 for flow guidance. The attachment 134 may be formed as an extension of the rotor platform with which the gap can be bridged and sealed. In order to seal the gap, the sealing element 112 can be arranged on a stator-side end of the extension 134. Thus, the sealing member 112 may interrupt and redirect the leakage flow 106 cause the guide 116. The leakage flow 106 can thus be guided past the sealing element 112, between the rotor shaft 126 and the extension 134, to the channel 132 in the rotor platform 124.

Gemäß diesem Ausführungsbeispiel grenzt das Dichtelement 112 an einen radial innen liegenden Absatz des Stator-Innendeckbands 144 an. Der Absatz ist so ausgebildet, dass das Dichtelement 112 den Spalt zwischen der Rotorplattform 124 und dem Stator-Innendeckband 144 in der Nähe der Rotorwelle 126 abdichtet. Auf diese Weise ist ein Abstand des Dichtelements 112 zu einem radial außen liegenden Ende des Stator-Innendeckbands 144 größer als ein Abstand des Dichtelements 112 zu einem radial innen liegenden Ende des Stator-Innendeckbands 144.According to this exemplary embodiment, the sealing element 112 adjoins a radially inner shoulder of the stator inner cover tape 144. The step is formed so that the sealing member 112 seals the gap between the rotor platform 124 and the stator inner shroud 144 in the vicinity of the rotor shaft 126. In this way, a distance of the sealing element 112 to a radially outer end of the stator inner shroud 144 is greater than a distance of the sealing element 112 to a radially inner end of the stator inner shroud 144th

In einem umlaufenden Spalt zwischen der Rotorwelle 126 und dem Stator-Innendeckband 144 können weitere Dichtungseinrichtungen 152 angeordnet sein. In Figur 1 sind drei weitere Dichtungseinrichtungen 152 gezeigt. Der Leckagestrom 106 strömt von einem Spalt zwischen dem Stator 102 und dem weiteren Rotor 104b, an den weiteren Dichtungseinrichtungen 152 vorbei in Richtung des Dichtelements 112. Für die weiteren Dichtungseinrichtungen 152 und für das Dichtelement 112 können beliebige Dichtungsanordnungen eingesetzt werden, die zur Abdichtung des Spalts zwischen dem Stator-Innendeckband 144 und der Rotorwelle 126 geeignet sind.In a circumferential gap between the rotor shaft 126 and the stator inner shroud 144 further sealing means 152 may be arranged. In FIG. 1 three further sealing devices 152 are shown. The leakage flow 106 flows from a gap between the stator 102 and the further rotor 104b, past the further sealing means 152 in the direction of the sealing element 112. For the further sealing means 152 and for the sealing element 112 can be used any sealing arrangements which are used to seal the gap between the stator inner shroud 144 and the rotor shaft 126 are suitable.

Figur 2 zeigt eine weitere schematische Darstellung des in Figur 1 gezeigten Rotors 104, des Stators 102 und des weiteren Rotors 104b. Die Rotoren 104, 104b weisen eine Mehrzahl von Rotorblättern 122, 122b auf. Der Stator 102 weist eine Mehrzahl von StatorSchaufeln 142 auf. FIG. 2 shows a further schematic representation of the in FIG. 1 shown rotor 104, the stator 102 and the other rotor 104b. The rotors 104, 104b have a plurality of rotor blades 122, 122b. The stator 102 has a plurality of stator blades 142.

Gemäß diesem Ansführungsbeispiel ist jeweils zwischen zwei Rotorblättern 122 eine Austrittsöffnung 114 angeordnet. Die Austrittsöffnungen 114 können dabei in einer Rotomabenfläche des Rotors 104 angeordnet sein. Gemäß diesem Ausführungsbeispiel sind die Austrittsöffnungen 114 als rechteckige Schlitze ausgeformt. Die Austrittsöffnungen 114 sind an demjenigen Rand der Rotomabenfläche angeordnet, der dem Stator 102 zugewandt ist.According to this Ansführungsbeispiel between each two rotor blades 122, an outlet opening 114 is arranged. The outlet openings 114 may be arranged in a Rotomabenfläche of the rotor 104. According to this embodiment, the outlet openings 114 are formed as rectangular slots. The outlet openings 114 are disposed on that edge of the Rotomabenfläche, which faces the stator 102.

Die Austrittsöffnungen 114 können so zwischen zwei Rotorblättern 122 angeordnet sein, dass eine Austrittsöffnung 114 jeweils näher an demjenigen der zwei benachbarten Rotorblätter 122 angeordnet ist, dass in Bezug auf eine Drehrichtung 152 des Rotors hinter der Austrittsöffnung 114 angeordnet ist.The outlet openings 114 may be arranged between two rotor blades 122 so that an outlet opening 114 is arranged in each case closer to that of the two adjacent rotor blades 122 that is arranged behind the outlet opening 114 with respect to a direction of rotation 152 of the rotor.

Figur 3 zeigt eine schematische Darstellung der Vorrichtung gemäß einem weiteren Ausführungsbeispiel eines erfindungsgemäßen Verdichters. Das in Figur 3 gezeigte Ausführungsbeispiel unterscheidet sich von dem in Figur 1 gezeigten Ausfuhrungsbeispiel in der konstruktiven Umsetzung der Führung 132 des Leckagestroms 106. Elemente, die sich nicht von dem in Figur 1 gezeigten Ausführungsbeispiel unterscheiden, sind im folgenden nicht erneut beschrieben. FIG. 3 shows a schematic representation of the device according to another embodiment of a compressor according to the invention. This in FIG. 3 embodiment shown differs from that in FIG. 1 shown exemplary embodiment in the constructive implementation of the guide 132 of the leakage current 106th Elements that do not differ from the in FIG. 1 different embodiment shown are not described again in the following.

Gemäß dem in Figur 3 gezeigten Ausführungsbeispiel grenzt das Dichtelement 112 wiederum an einen Absatz des Stator-Innendeckbands 144 an. Der Absatz ist hier jedoch so ausgebildet, dass das Dichtelement 112 den Spalt zwischen der Rotorplattform 124 und dem Stator-Innendeckband 144 in der Nähe des radial äußeren Endes des Stator-Innendeckbands 144 abdichtet. Auf diese Weise ist ein Abstand des Dichtelements 112 zu einem radial außen liegenden Ende des Stator-Innendeckbands 144 kleiner als ein Abstand des Dichtelements 112 zu einem radial innen liegenden Ende des Stator-Innendeckbands 144. Der Leckagestrom 106 kann innerhalb eines Hohlraums zwischen der Rotorwelle 126 und dem Fortsatz 134 der Rotorplattform 124 zu dem Kanal 132 geführt werden. Gemäß diesem Ausführungsbeispiel kann der Kanal 132 als Bohrung für eine geführte Leckagenausströmung ausgeführt sein. Die Austrittsöffnung 114 des Kanals 132 kann an der Nabenfläche und/oder der Stirnfläche der Rotorplattform 134 angeordnet sein, wobei auch eine Strömungskomponente entgegen der Hauptströmungsrichtung möglich ist (siehe gestrichelte, strichpunktierte und strichdoppelpunktierte Darstellung).According to the in FIG. 3 In the exemplary embodiment shown, the sealing element 112 in turn adjoins a shoulder of the stator inner cover tape 144. However, the shoulder is configured so that the sealing member 112 seals the gap between the rotor platform 124 and the stator inner shroud 144 near the radially outer end of the stator inner shroud 144. In this way, a distance of the sealing member 112 to a radially outer end of the stator inner shroud 144 is smaller than a distance of the sealing member 112 to a radially inner end of the stator inner shroud 144. The leakage current 106 may be within a cavity between the rotor shaft 126 and the extension 134 of the rotor platform 124 are guided to the channel 132. According to this embodiment, the channel 132 may be configured as a bore for a guided leakage outflow. The outlet opening 114 of the channel 132 may be disposed on the hub surface and / or the end surface of the rotor platform 134, wherein a flow component opposite to the main flow direction is possible (see dashed, dot-dash line and dash-dotted line illustration).

Figur 4 zeigt, entsprechend zu der Figur 2, eine weitere schematische Darstellung des in Figur 3 gezeigten Rotors 104, des Stators 102 und des weiteren Rotors 104b. FIG. 4 shows, according to the FIG. 2 , another schematic representation of the in FIG. 3 shown rotor 104, the stator 102 and the other rotor 104b.

Aus der Figur 4 ist ersichtlich, dass die Austrittsöffnungen 114 gemäß dem in Figur 3 gezeigten Ausführungsbeispiel einen runden Querschnitt aufweisen können. Die Austrittsöffnungen 114 können von dem Rand der Rotornabe beabstandet angeordnet sein. Dabei kann ein Abstand der Austrittsöffnungen 114 von einem, dem Stator 102 abgewandten Rand der Rotornabe größer sein, als ein Abstand der Austrittsöffnung von einem dem Stator 102 zugewandten Rand der Rotornabe.From the FIG. 4 it can be seen that the outlet openings 114 according to the in FIG. 3 embodiment shown may have a round cross-section. The exit openings 114 may be spaced from the rim of the rotor hub. In this case, a distance of the outlet openings 114 from one, the stator 102 facing away from the edge of the rotor hub be greater than a distance of the outlet opening of the stator 102 facing edge of the rotor hub.

Das Verfahren ermöglicht die Umleitung des Leckagestroms 106, indem ein Fluss des Leckagestroms 106 in dem Spalt zwischen Stator-Innendeckband 144 und Rotorplattform 124 mit Hilfe des Dichtelements 112 unterbrochen wird und der Leckagestrom statt dessen an dem Dichtelement 112 vorbei zu der an dem Rotor 102 angeordneten Austrittsöffnung 114 geführt wird.The method allows diversion of the leakage stream 106 by interrupting flow of the leakage stream 106 in the gap between the stator inner shroud 144 and the rotor platform 124 by means of the sealing member 112 and the leakage flow instead is disposed past the sealing member 112 to that on the rotor 102 Outlet opening 114 is guided.

In anderen Worten beschrieben, können Leckageströmungen 106 im Bereich der Inner Air Seals 152 weiter stromaufwärts eingebracht werden. Somit kann ein Umleiten des Leckage-Massenstromes 106 durch Kanäle 116, 132 erfolgen, die unter der letzte Dichtspitze 112 hindurch bis zu Öffnungen 114 des stromaufwärts liegenden Rotors 104 führen können. Dadurch kann eine umfangsdiskrete Abblasung des Kavitäten-Massenstroms 106 über die Rotor-Plattform 124 von axialen Verdichtern zur Verbesserung der Strömungsqualität an der Statornabe erfolgen.In other words, leakage flows 106 may be introduced further upstream in the region of the inner air seals 152. Thus, the leakage mass flow 106 can be redirected through channels 116, 132 which can pass under the last sealing tip 112 to openings 114 of the upstream rotor 104. As a result, circumference-discrete blow-off of the cavity mass flow 106 via the rotor platform 124 from axial compressors can take place to improve the flow quality at the stator hub.

Weist ein Verdichter eine Mehrzahl von Rotor-Stator-Paaren auf, so kann der erfindungsgemäße Ansatz bei jedem Rotor-Stator-Paar angewendet werden.If a compressor has a plurality of rotor-stator pairs, then the approach according to the invention can be applied to any rotor-stator pair.

Die gezeigten Ausführungsbeispiele sind lediglich beispielhaft gewählt und können miteinander kombiniert werden. Die beschriebenen Elemente, deren Formgebung sowie deren Anordnung können im Rahmen des erfindungsgemäßen Ansatzes geändert werden. Ebenso kann eine Anzahl und Anordnung der Austrittsöffnungen geändert werden. Insbesondere sind diejenigen Elemente anpassbar, die eine Variation und Optimierung der Einblasrichtung des Leckagestroms ermöglichen. Der erfindungsgemäße Ansatz zur Umleitung eines Leckagestroms ist dabei nicht auf die beschriebene Anwendung im Zusammenhang mit einem Innendeckband eines Stators beschränkt, sondern kann generell innerhalb und außerhalb der vorliegenden Erfindung zur Führung von Leckageströmen eingesetzt werden, die im Grenzbereich zwischen statischen und beweglichen Baugruppen auftreten.The exemplary embodiments shown are chosen merely by way of example and can be combined with one another. The described elements, their shape and their arrangement can be changed within the scope of the inventive approach. Likewise, a number and arrangement of the outlet openings can be changed. Especially are those elements adaptable that allow a variation and optimization of the injection direction of the leakage current. The inventive approach for the diversion of a leakage current is not limited to the application described in connection with an inner shroud of a stator, but can generally be used inside and outside the present invention for guiding leakage currents that occur in the boundary region between static and moving assemblies.

Claims (15)

  1. An axial compressor, including at least one rotor (104) and at least one stator (102), the rotor being disposed upstream of the stator in relation to a main flow in the compressor, comprising a device for redirecting a leakage current (106) flowing between the stator (102) and the rotor (104), having the following features:
    a sealing element (112);
    an outlet opening (114) disposed on the rotor; and
    a guide (116, 132) configured to direct the leakage current past the sealing element to the outlet opening, characterized in that the sealing element (112) is a sealing element for interrupting the leakage current.
  2. The axial compressor according to claim 1, characterized in that the guide (116, 132) is configured to provide a defined injection direction for the leakage current (106) at the outlet opening (114).
  3. The axial compressor according to claim 1 or 2, characterized in that the guide (116, 132) has a channel (116) leading through a rotor platform (124) of the rotor (102), the channel being connected to the outlet opening (114).
  4. The axial compressor according to any one of the preceding claims, characterized in that the outlet opening (114) is disposed in a rotor platform (124) of the rotor (104).
  5. The axial compressor according to any one of the preceding claims, characterized in that the rotor (104) has an extension (134), which is configured to bridge a gap extending in a radial direction between the rotor and the stator (102), wherein the sealing element (112) is disposed on a stator-side end of the extension.
  6. The axial compressor according to claim 5, characterized in that the guide (116, 132) is configured to guide the leakage current (106) between a rotor shaft (126) of the rotor (104) and the extension (134).
  7. The axial compressor according to any one of the preceding claims, characterized in that the sealing element (112) abuts an inner cover band (144) of the stator (102), wherein a distance between the sealing element and a radially outer end of the inner cover band is greater than, or equal to, a distance between the sealing element and a radially inner end of the inner cover band.
  8. The axial compressor according to any one of claims 1 to 6, characterized in that the sealing element (112) abuts an inner cover band (144) of the stator (102), wherein a distance between the sealing element and a radially outer end of the inner cover band is smaller than a distance between the sealing element and a radially inner end of the inner cover band.
  9. The axial compressor according to any one of the preceding claims, characterized in that the outlet opening (114) is disposed in a hub surface and/or on an end face of the rotor (104).
  10. The axial compressor according to claim 9, characterized in that a distance between the outlet opening (114) and an edge of the hub surface facing away from the stator (104) is greater than a distance between the outlet opening and an edge of the hub surface facing the stator,
  11. The axial compressor according to claim 9, characterized in that the outlet opening (114) is disposed on an edge of the hub surface facing the stator (102).
  12. The axial compressor according to any one of the preceding claims, characterized in that the outlet opening (114) is disposed between two rotor blades (122) of the rotor (104), wherein the outlet opening is disposed closer to the one of the two rotor blades which, in relation to a rotational direction (152) of the rotor, is disposed behind the outlet opening.
  13. The axial compressor according to any one of the preceding claims, characterized in that the outlet opening (114) has a round cross-section.
  14. The axial compressor according to any one of claims 1 to 12, characterized in that the outlet opening (114) is configured as a slot.
  15. The axial compressor according to any one of the preceding claims, furthermore comprising at least one further outlet opening (114) disposed on the rotor (104) and at least one further guide (116, 132), which is configured to guide at least a portion of the leakage current (106) past the sealing element (112) to the at least one further outlet opening.
EP09714205.3A 2008-02-28 2009-02-19 Axial compressor with a device for redirecting a leakage flow Not-in-force EP2250347B1 (en)

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DE102008011746A DE102008011746A1 (en) 2008-02-28 2008-02-28 Device and method for diverting a leakage current
PCT/DE2009/000229 WO2009106045A1 (en) 2008-02-28 2009-02-19 Device and method for redirecting a leakage current

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DE102008011746A1 (en) 2009-09-03
EP2250347A1 (en) 2010-11-17
WO2009106045A1 (en) 2009-09-03
CA2716878A1 (en) 2009-09-03
CN101946064A (en) 2011-01-12
CN101946064B (en) 2014-10-22
US8753070B2 (en) 2014-06-17
WO2009106045A8 (en) 2010-12-02
US20110058933A1 (en) 2011-03-10

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