US20020060432A1 - Seal apparatus - Google Patents

Seal apparatus Download PDF

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Publication number
US20020060432A1
US20020060432A1 US09/987,322 US98732201A US2002060432A1 US 20020060432 A1 US20020060432 A1 US 20020060432A1 US 98732201 A US98732201 A US 98732201A US 2002060432 A1 US2002060432 A1 US 2002060432A1
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US
United States
Prior art keywords
seal
rotating
sealing
lands
yoke
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.)
Abandoned
Application number
US09/987,322
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English (en)
Inventor
John Webster
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
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 Rolls Royce PLC filed Critical Rolls Royce PLC
Assigned to ROLLS-ROYCE PLC, A BRITISH COMPANY reassignment ROLLS-ROYCE PLC, A BRITISH COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEBSTER, JOHN RICHARD
Publication of US20020060432A1 publication Critical patent/US20020060432A1/en
Priority to US11/166,727 priority Critical patent/US7249769B2/en
Abandoned 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
    • 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
    • F01D11/025—Seal clearance control; Floating assembly; Adaptation means to differential thermal dilatations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • F16J15/3288—Filamentary structures, e.g. brush seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/44—Free-space packings
    • F16J15/447—Labyrinth packings
    • F16J15/4472—Labyrinth packings with axial path

Definitions

  • This invention relates to seal apparatus. More specifically but not exclusively this invention relates to a seal for sealing between one rotating member and one static member.
  • a gas turbine engine comprises shafts which rotate at relatively high speeds and which are exposed to pressurised hot gases. Seals are required between rotating rotor blades and surrounding static casing structure.
  • Seals are also required between a rotor carrying such rotor blades and an adjacent static structure which carries stator vanes or nozzle guide vanes.
  • nozzle guide vanes or stator vanes are non-rotating and as such mounted on a static structure.
  • a seal for providing sealing between at least two separate and differing pressure zones and between a rotating structure and non-rotating structures, comprising first and second sealing means, the first sealing means comprising first and second seal lands positioned either side of a rotating seal member, said seal lands being connected together via connecting means, said connecting means being movably mounted on said non-rotating structure and arranged to be moveable so as to accommodate relative movement of said rotating and non-rotating structures, said second seal member being arranged and positioned to provide a seal between said non-rotating structure and the first seal land positioned in a lower pressure zone such that the pressure around this seal land is controlled.
  • the seal lands may comprise two opposing magnets arranged to repel one another.
  • the sealing lands comprise rings.
  • the sealing member comprises a rotating sealing fin attached to a rotor of a gas turbine engine.
  • the connecting means may comprise a yoke.
  • the yoke may be connected to the non-rotating member by a first pivot, allowing rotational movement of the yoke.
  • the opposing faces of the seal lands may comprise reduced area portion positioned opposite one another.
  • FIG. 1 is a partially cut-away view of a turbo fan gas turbine engine having one or more seals according to the present invention
  • FIG. 2 is an illustration of the general concept of the present invention
  • FIG. 3 is another illustration of a general concept of the present invention.
  • FIG. 4 is another illustration of the general concept of the present invention.
  • FIG. 5 is a sectional view through a compressor rotor and adjacent stator incorporating a seal according to a embodiment of the present invention
  • FIG. 6 is a view of FIG. 5 illustrating a seal's position in a gas turbine engine
  • FIG. 7 is a diagrammatic view of a further embodiment of the present invention.
  • FIG. 8 is a diagrammatic view of another seal according to the present invention.
  • FIG. 9 is a diagrammatic view of an alternative seal according to the present invention.
  • FIG. 10 is a diagrammatic view of a further seal according to the present invention.
  • FIG. 11 is a diagrammatic view of an additional seal according to the present invention.
  • FIG. 12 is a diagrammatic view of a final seal according to the present invention.
  • a gas turbine engine 10 is shown in FIG. 1 and comprises in axial flow series, an intake 12 , a fan section 14 , an intermediate pressure compressor section 16 , a high pressure compressor section 18 , a combustion section 20 , a high pressure turbine section 22 ,, an intermediate pressure turbine section 24 , a low pressure turbine section 26 and an outlet 28 .
  • the fan section 14 has a fan outlet 30 to provide bypass flow.
  • the low pressure turbine section 26 is arranged to drive the fan section 14 by a first shaft 32
  • the intermediate pressure turbine section 24 is arranged to drive the intermediate pressure compressor section 16 by a shaft 34
  • the high pressure turbine section 26 is arranged to drive the high pressure compressor section 18 by a shaft 36 .
  • the gas turbine engine 10 operates conventionally in that air is compressed as it flows through the fan section 14 , the intermediate pressure compressor section 16 and the high pressure compressor section 18 .
  • the air is then delivered into the combustion section 20 and fuel is injected into the combustion section 20 and burnt in the air to produce hot gases.
  • These hot gases flow through and drive the high pressure turbine section 22 , the intermediate pressure turbine section 24 and the low pressure turbine section 26 .
  • the hot gases then flow through the outlet 28 to provide some thrust.
  • the main thrust is provided by the air compressed by the fan section 14 and discharged through the fan outlet 30 .
  • a seal arrangement 40 is described below with respect to a gas turbine engine, although it is to be appreciated that the seal is suitable for any application between relatively moveable components where sealing is required.
  • FIGS. 2, 3 and 4 are provided to explain the general concept of the present invention. Embodiments of the present invention with respect to practical applications are shown in FIGS. 5, 6 and 7 .
  • the seal arrangement 40 comprises a rotating member 42 attached to a support member 44 which supports a sealing fin 46 .
  • the sealing fin 46 is mounted, in this conceptual arrangement, between two magnetic rings 48 and 50 and the magnetic rings 48 , 50 being arranged to repel one another. These magnetic discs may be of segmented form to provide the necessary magnetic repulsion and/or mechanical flexibility.
  • the sealing fin 46 is manufactured from a conducting material and is positioned at the mid point between the two magnetic rings 48 and 50 . As the sealing fin 46 is manufactured to be thin, no flux is cut between the magnets 48 and 50 and therefore no drag is generated at the central position. As the sealing fin 46 is displaced from its central position the flux is cut and a restoring force is generated.
  • the sealing apparatus 40 shown in FIG. 2 and FIG. 3 is arranged to provide a seal between a static structure 52 which could be envisaged as the casing of a turbine of a gas turbine engine, and the rotating structure 42 .
  • the magnetic rings 48 and 50 are rigidly connected together via a yoke 54 which is flexibly attached to the casing by one or more leaf springs 56 which allow the magnetic rings 48 , 50 via their yoke 54 to move axially with respect to the rotating fin 46 .
  • a number of pressure zones are located around sealing apparatus 40 , which could be considered to be the high pressure and low pressure zones located within the compressor or turbine of a gas turbine engine.
  • One side of the rotating fin 46 and attached structure is adjacent a high pressure zone 60 .
  • the other side of the rotating member 42 and its attached sealing fin 46 is adjacent a low pressure zone 62 .
  • the relative position between the sealing fin 46 and the static structure 52 is altered during normal operation due to factors such as differential thermal expansion, centrifugal growth, and changes in pressure.
  • the purpose of the seal is to prevent passage of fluid from the high pressure zone 60 to the low pressure zone 62 . Forces are generated in the moveable segment by pressures around the elements and any bias which may be applied by the leaf springs 56 .
  • a second seal 64 is therefore located such that a seal between the high pressure zone 60 and low pressure zone 62 is not only provided by sealing fin 46 but also secondary seal 64 .
  • a secondary seal 64 comprises a second sealing fin 66 located outwardly from magnetic ring 50 , this fin 66 would also be formed as a disc.
  • the fin 46 is in sealing contact with secondary seal 68 which is attached to casing 52 .
  • sealing fin 46 is to maintain a suitable clearance gap thus accommodating displacement of the static member 52 or rotating member 42 in response to pressure changes and in general to any movement between said static member 52 and rotating member 42 .
  • Pressure distribution around the seal may be controlled by effective positioning of the secondary seal 64 . Without such a secondary seal 64 the main seal 40 is required to provide magnetic forces to counter large forces provided by pressure differences.
  • the positioning of the secondary seal 64 as shown in FIGS. 2 and 3, provides a high pressure zone around the majority of the seal as shown. The pressure may be used to balance, or minimise, the forces which are generated. An offset force may also be provided by positioning of the secondary seal 64 . This will have a significant effect on the required size, weight, stability and cost of the magnetic seal lands 48 and 50 and the other elements of the seal system.
  • Full pressure balancing may be obtained by arranging or positioning the secondary seal such that an area equal to half of the main seal land area is subject to the high pressure.
  • the main seal land area is indicated by small letter ‘a’ and the secondary seal land area is indicated by small letter ‘f’.
  • the force, F, on magnet 48 is derived as follows:
  • HP high pressure and a is area of face a
  • the force on face e is balanced by the force on face g and may be disregarded.
  • the area of pressure lands of the magnets 48 and 50 are reduced, as indicated by c and d and may be used to reduce the effect or imperfections by allowing the forces to act only on smaller areas.
  • the same principle may be used with other force generating mechanisms.
  • FIGS. 5 and 6 A practical application of the concept indicated in FIGS. 2, 3 and 4 is shown in FIGS. 5 and 6.
  • a seal 70 similar to the conceptual arrangement shown in FIGS. 2, 3 and 4 is arranged to provide a seal between the fan rotor 71 and adjacent stator structure 73 of a gas turbine engine.
  • the downstream end of the fan rotor is provided with a sealing fin 74 attached thereto by a bolt 76 .
  • This sealing fin 74 comprises a ring structure and is mounted radially between two ring magnets 77 , 79 .
  • the sealing fin 74 being thin so as to provide a null-flux magnetic zone around the central region between ring magnets 77 and 79 .
  • the ring magnets 77 , 79 are rigidly mounted on a yoke 78 .
  • the yoke 78 comprises a U shaped cut away portion 81 into which the sealing fin disc 74 protrudes.
  • the yoke 78 is pivotaly mounted on the stator by a pivot point 80 . This pivot point 80 allows rotational movement of said yoke and hence can control the sealing clearance 82 between said ring magnets 77 , 79 and said sealing fin 74 .
  • a secondary seal 84 is provided, and this secondary seal 84 comprises a hook type protrusion 86 on said stator structure 73 and a co-operating seal land 88 mounted on said yoke 78 .
  • this secondary seal 84 prevents low pressure air indicated in FIGS. 5, 6 and 7 by LP, flowing freely around the rear 90 of seal 70 thus allowing the rear of the seal to be provided within high pressure zone, HP.
  • An intermediate pressure zone, IP is formed around the downstream end 92 of the sealing fin 74 .
  • the secondary seal 84 is positioned to follow an arc around the pivot point 80 . This position of the secondary seal 84 is chosen to balance the rotational forces generated by the pressures around the pivot point 80 .
  • pressure balance can be obtained by arranging the secondary seal 84 to be provided with a seal land area calculated for pressure balancing.
  • FIG. 6 is a view of a seal according to the present invention, mounted within a gas turbine engine.
  • a fan blade 95 is mounted on a fan disc 97 and seal apparatus 70 seals between the high pressure and low pressure zones.
  • FIG. 7 illustrates the further embodiment of the present invention whereby the magnets are replaced by an air riding seal system 94 .
  • this air riding seal 94 is provided to seal between a rotating rotor 96 comprising a sealing fin 98 extending there from and two halves 100 and 102 of the air riding seal 94 , and a static casing 104 .
  • the two halves 100 , 102 of the seal 94 are separated as the engine stops, thus preventing contact as the centring forces are lost.
  • the two halves 100 and 102 are rings.
  • Secondary seal 106 provides the pressure balancing as previously explained.
  • the two halves 100 , 102 of the seal system 94 are pushed apart by one or more springs 112 , are located on locating pins 108 and are centralised by two sets of weaker springs 110 .
  • the two halves 100 and 102 are pushed together until they reach their normal operating clearance. At this stage, they move together as a pressure balance seal with additional centring forces provided by the air riding seal mechanism. It is envisaged that other mechanisms such as temperature activated, or bi-metallic structures could be provided to achieve retraction of the seals when not required.
  • FIG. 8 Another embodiment of the present invention is shown in FIG. 8 and this illustrates an air riding seal system 94 B similar to that shown in FIG. 7.
  • the air riding seal 94 is provided to seal between a rotor 96 comprising a sealing fin 98 extending therefrom, two interconnected halves 100 and 102 of the air riding seal 94 and a stator structure 104 .
  • the air riding seal 94 is mounted on the static structure 104 by leaf springs 103 .
  • the two halves 100 and 102 are rings.
  • the secondary seal 106 B provides the pressure balancing as previously explained.
  • the secondary seal 106 is also an air riding seal.
  • a passage 105 through the static structure 104 supplies, in operation, high pressure air to the secondary seal 106 B to form an air riding seal/air bearing. The forces are essentially balanced and hence the air riding seal 94 may be operated with relatively large clearance to minimise change from debris.
  • FIG. 9 An alternative embodiment of the present invention is shown in FIG. 9 wherein the magnets are replaced by a brush seal system 120 and is similar to that shown in FIG. 5.
  • the brush seal 120 is provided to seal between a rotor 71 and static structure 73 .
  • a sealing fin 74 is attached to the rotor 71 .
  • the sealing fin 74 is mounted between two brush seals 122 and 124 .
  • the brush seals 122 and 124 are rigidly mounted on a yoke 78 , the yoke 78 comprises a U shaped cut away portion 81 into which the sealing fin 74 extends.
  • the yoke 78 is pivotally mounted on the stator structure 73 at a pivot point 80 .
  • the pivot point 80 allows rotational movement of the yoke 78 and hence can control the sealing clearance 82 between the brush seals 122 and 124 and the sealing fin 74 .
  • a secondary seal 84 is provided and comprises a protrusion 86 on the static structure 73 and a cooperating seal land 88 on the yoke 78 .
  • the brush seals 122 and 124 are annular.
  • the sealing fin 78 may extend radially and the brush seals 122 and 124 extend axially or the sealing fin 74 may extend radially and the brush seals 122 and 124 extend radially.
  • FIG. 10 A further embodiment of the present invention is shown in FIG. 10 and this illustrates a labyrinth seal system 130 .
  • the labyrinth seal 130 is provided to seal between a turbine rotor 71 comprising an axially extending annular fin 74 and a stator structure 73 .
  • a yoke 78 is mounted on the static structure 73 by leaf springs 75 , and the yoke 78 comprises a U shaped cut away portion into which the sealing fin 74 extends.
  • the leaf springs 75 allow radial movement of the yoke 78 and hence control the sealing fin 74 and the yoke 78 .
  • the sealing fin 74 has projections 134 extending radially outwardly and projections 132 extending radially inwardly which cooperate with abradable coatings 138 and 136 respectively on the surfaces of the yoke 78 .
  • FIG. 11 An additional embodiment of the present invention is shown in FIG. 11 and this illustrates a magnetic seal system 140 .
  • the magnetic seal system 140 is similar to that shown in FIGS. 2, 3 and 4 .
  • the magnetic seal system 140 differs in that the annular side wall 55 of the yoke 54 , closest to the secondary seal 68 attached to the casing 52 is perforated whereas the annular side wall 53 of the yoke 54 , furthest from the secondary seal 68 attached to the casing 52 , is not perforated.
  • the perforated annular side wall 55 of the yoke 54 has a smaller surface area than the unperforated annular side wall 53 of the yoke 54 .
  • a third seal 65 is provided such that the intermediate pressure IP zone is defined by the yoke 54 , the second seal 64 and the third seal 65 .
  • the third seal 65 comprises a third annular sealing fin 67 extending from the yoke 54 from a position between the side walls 53 and 55 of the yoke 54 , towards but spaced from the second seal member 68 and an annular hook shaped projection 69 extending from the second seal member 68 towards but spaced from the third annular sealing fin 67 to form the third seal 65 .
  • the difference in surface area between the side walls 53 and 55 of the yoke 54 results in the magnets 48 and 50 and yoke 54 initially moving towards the left until the rise in intermediate pressure moves the magnets 48 and 50 and yoke 54 towards the right and back to the balance position.
  • the second seal 64 is positioned radially to balance the loads on the seal 140 at the central position.
  • FIG. 12 A further embodiment of the present invention is shown in FIG. 12 and this illustrates a magnetic seal system 150 .
  • the magnetic seal system 150 is substantially the same as that shown in FIGS. 2, 3 and 4 .
  • the magnetic seal system 150 differs in that the tip 47 of the sealing fin 46 is shaped to increase the aerodynamic lift between the sealing fin 46 and the sealing lands 48 and 50 .
  • the tip 47 of the sealing fin 46 is located substantially between the magnets 48 and 50 .
  • the sealing fin 46 has a first surface 46 A facing the high pressure zone 60 and a second surface 46 B facing the low pressure zone 62 .
  • the tip 47 of the sealing fin 46 is stepped such that there is a curved surface portion 47 A interconnecting surface 46 A with a planar surface portion 47 B, which is parallel to surface 46 A, and a curved surface portion 47 C interconnecting surface portion 47 B with a planar surface portion 47 D, which is parallel to surface 46 A and surface portion 47 B.
  • Surface portion 47 B is nearer to the magnet 48 than surface 46 A and surface portion 47 D is nearer to the magnet 48 than surface portions 47 B.
  • fluid flows from the high pressure zone 60 , to the low pressure zone 62 through the seal 150 .
  • the fluid initially flows in the direction of arrows A along the surface 46 A of the sealing fin 46 towards the tip 47 of the sealing fin 46 .
  • the fluid is directed to flow away from the surface 46 A by the curved surface portion 47 A of the tip 47 towards the magnet 48 .
  • the curved surface portion 47 C of the tip 47 directs the fluid away from the surface portion 47 B towards the yoke portion 54 A. This directing of fluid flow towards the magnet 48 increases the lift between the sealing fin 46 and the magnet 48 and yoke 54 .
  • the fluid flows in the direction of arrows B along the surface 47 H of the tip 47 of the sealing fin 46 towards the surface 46 B of the sealing fin 46 .
  • the fluid is directed to flow away from the surface 47 H by the curved surface portion 47 G of the tip 47 towards the magnet 50 .
  • the curved surface portion 47 E of the tip 47 directs the fluid away from the surface portion 47 F towards the yoke portion 54 B.
  • This directing of fluid towards the magnet 50 increases the lift between the sealing fin 46 and the magnet 50 /yoke 54 . This is because the fluid velocity in a small clearance gap is greater than the fluid velocity in a large clearance gap for the same mass flow and hence there is a greater force with a small clearance gap.
  • the clearance gap is of the order of 80 ⁇ m in width and 10 mm long.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sealing Devices (AREA)
US09/987,322 2000-11-22 2001-11-14 Seal apparatus Abandoned US20020060432A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/166,727 US7249769B2 (en) 2000-11-22 2005-06-27 Seal apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0028408.3 2000-11-22
GBGB0028408.3A GB0028408D0 (en) 2000-11-22 2000-11-22 Seal apparatus

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/166,727 Continuation US7249769B2 (en) 2000-11-22 2005-06-27 Seal apparatus

Publications (1)

Publication Number Publication Date
US20020060432A1 true US20020060432A1 (en) 2002-05-23

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Family Applications (2)

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US09/987,322 Abandoned US20020060432A1 (en) 2000-11-22 2001-11-14 Seal apparatus
US11/166,727 Expired - Lifetime US7249769B2 (en) 2000-11-22 2005-06-27 Seal apparatus

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US11/166,727 Expired - Lifetime US7249769B2 (en) 2000-11-22 2005-06-27 Seal apparatus

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US (2) US20020060432A1 (fr)
EP (1) EP1209389B1 (fr)
DE (1) DE60116455T2 (fr)
GB (1) GB0028408D0 (fr)

Cited By (5)

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US20070085276A1 (en) * 2003-12-16 2007-04-19 Schaeffler Kg Seal with non-contact adjacent deflector rings
WO2008154592A2 (fr) * 2007-06-11 2008-12-18 University Of Florida Research Foundation, Inc. Régulation électrodynamique d'une perte par fuite dans le jeu de pale dans des applications de turbomachine
US9097347B2 (en) 2013-03-13 2015-08-04 Pratt & Whitney Canada Corp. Carbon seal assembly
US9771821B1 (en) * 2015-06-15 2017-09-26 Florida Turbine Technologies, Inc. Turbine interstage seal with self-balancing capability
US9957825B2 (en) * 2013-10-11 2018-05-01 United Technologies Corporation Non-linearly deflecting brush seal land

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US7938402B2 (en) 2004-05-28 2011-05-10 Stein Seal Company Air riding seal
US8657297B2 (en) 2004-05-28 2014-02-25 Stein Seal Company Air riding seal
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US9121299B2 (en) * 2013-06-05 2015-09-01 General Electric Company Axially retractable brush seal system
US9732622B1 (en) * 2015-06-16 2017-08-15 Florida Turbine Technologies, Inc. Self-balancing air riding seal for a turbine
GB201514651D0 (en) * 2015-08-18 2015-09-30 Rolls Royce Plc Sealing arrangements
FR3066533B1 (fr) * 2017-05-17 2019-06-14 Safran Aircraft Engines Ensemble d'etancheite pour une turbomachine
US11028715B2 (en) * 2018-10-02 2021-06-08 Rolls-Royce North American Technologies, Inc. Reduced leakage air seal
US11118469B2 (en) * 2018-11-19 2021-09-14 General Electric Company Seal assembly for a turbo machine
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
US20070085276A1 (en) * 2003-12-16 2007-04-19 Schaeffler Kg Seal with non-contact adjacent deflector rings
US7624989B2 (en) * 2003-12-16 2009-12-01 Schaeffler Kg Seal with non-contact adjacent deflector rings
WO2008154592A2 (fr) * 2007-06-11 2008-12-18 University Of Florida Research Foundation, Inc. Régulation électrodynamique d'une perte par fuite dans le jeu de pale dans des applications de turbomachine
WO2008154592A3 (fr) * 2007-06-11 2009-02-12 Univ Florida Régulation électrodynamique d'une perte par fuite dans le jeu de pale dans des applications de turbomachine
US20100183424A1 (en) * 2007-06-11 2010-07-22 University Of Florida Research Foundation, Inc. Electrodynamic Control of Blade Clearance Leakage Loss in Turbomachinery Applications
US9347331B2 (en) 2007-06-11 2016-05-24 University Of Florida Research Foundation, Inc. Electrodynamic control of blade clearance leakage loss in turbomachinery applications
US9097347B2 (en) 2013-03-13 2015-08-04 Pratt & Whitney Canada Corp. Carbon seal assembly
US9957825B2 (en) * 2013-10-11 2018-05-01 United Technologies Corporation Non-linearly deflecting brush seal land
US9771821B1 (en) * 2015-06-15 2017-09-26 Florida Turbine Technologies, Inc. Turbine interstage seal with self-balancing capability

Also Published As

Publication number Publication date
EP1209389B1 (fr) 2006-01-04
EP1209389A3 (fr) 2003-12-03
US7249769B2 (en) 2007-07-31
GB0028408D0 (en) 2001-01-03
EP1209389A2 (fr) 2002-05-29
DE60116455T2 (de) 2006-07-20
US20050285345A1 (en) 2005-12-29
DE60116455D1 (de) 2006-03-30

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