WO1995023910A1 - Compressor stator assembly - Google Patents
Compressor stator assembly Download PDFInfo
- Publication number
- WO1995023910A1 WO1995023910A1 PCT/US1995/002307 US9502307W WO9523910A1 WO 1995023910 A1 WO1995023910 A1 WO 1995023910A1 US 9502307 W US9502307 W US 9502307W WO 9523910 A1 WO9523910 A1 WO 9523910A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stator assembly
- seal support
- vane
- radially
- seal
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
-
- 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
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/042—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector fixing blades to stators
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/60—Efficient propulsion technologies, e.g. for aircraft
Definitions
- the stator assembly 18 includes an outer vane support structure 20 to which the outer end of vanes 22 are rigidly connected.
- An axial gas flowpath 24 is defined between the outer vane support structure 18 and the bounding surface 26 at the inward side.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Stator vanes (22) are potted within pockets (38) in composite inner shroud sections (36). The pocket depth is only that required for bond strength and vane damping. Ribs (48) extend inwardly and are adhesively bonded to the seal support ring (32, 34) which carries abradable seal surface.
Description
Compressor Stator Assembly
Technical Field
The invention relates to low pressure compressors for gas turbine engines and in particular to vanes and the inner shroud therefore.
Background of the Invention
Gas turbine engines for aircraft require a compressor in a gas turbine. Light weight of the gas turbine engine is important. Usually the compressor includes a low pressure compressor and a high pressure compressor. Low temperature exists in a low pressure compressor making it possible to use many composite materials.
U.S. Patent 4,655,682 issued April 7, 1987 to Cleon V. Kunz and Dennis H. Jones shows a composite inner shroud for low pressure compressor. The inner ends of the compressor vanes are potted within pockets in this inner shroud. A support structure to which the shroud is secured on its shroud edge carries on its inside surface an abradable seal. Knife edges on the turbine rotor interact with the abradable seal to form a flow restriction, sealing against bypass airflow. When the compressor rotor is radially remote from the airflow path a deeper pocket is used than would be required
for bond strength and vibration damping. This pocket is filled with potting compound, thereby adding weight to the compressor. This remote location tends to exist at the axial extreme of the compressor.
There the shroud is adhesively bonded to the support structure, this occurring along contacting surfaces. While substantial surface area is achieved for the bonding, there is a potential of peeling apart of the two surfaces upon failure at one location.
Summary of the Invention
The stator assembly defines the axial flowpath of a compressor. A seal support carries an abradable air seal secured to the inwardly facing surface. This seal interacts with knife edges located on the compressor rotor.
There is an outer vane support structure to which a circumferential row of vanes are rigidly secured at the outer ends. A plurality of arcuate inner shroud sections are circumferentially located adjacent one another. Each has a plurality of vane receiving pockets with the inner ends of the vanes located within the pocket. The vanes in the pocket are imbedded in a potting compound such as silicon rubber.
Under the bottom of each pocket there are plurality* of circumferentially extending ribs integral with the inside edge
of each bottom, and which extend radially inward therefrom. These ribs are adhesively bonded to the seal support.
The first stage vane assembly has a seal support in the form of a ring which also forms a bounding portion of the flowpath upstream of the vane. A composite seal support ring is used here. For a higher stage in the compressor an aluminum seal support formed of ring segments is made with a flat band of aluminum.
Each of the plurality of shroud sections has an axially and radially extending wall at each circumferential end.
These end walls are also adhesively bonded to the seal support and may include ribs of their own.
Brief Description of the Drawings Figure 1 is a partial section through a low pressure compressor of a gas turbine engine;
Figure 2 is a view of the first stage vane stator assembly;
Figure 3 is a view taken along 3-3 of Figure 2 showing the underside of the shroud; and
Figure 4 is a view of a later stage vane stator assembly.
Description of the Preferred Embodiment
Low pressure compressor 10 of Figure 1 includes a rotor
12 rotatable about centerline 14 and carrying a plurality of compressor blades 16. The stator assembly 18 includes an outer vane support structure 20 to which the outer end of vanes 22 are rigidly connected. An axial gas flowpath 24 is defined between the outer vane support structure 18 and the bounding surface 26 at the inward side.
Knife edges 28 on rotor 12 are located adjacent abradable seal surfaces 30 for sealing against air passage.
These seal surfaces are secured to the radially inward facing surface of seal support rings 32 or 34.
The first stage stator assembly with support ring 32 is better seen in Figures 2 and 3. A plurality of arcuate inner shroud sections 36 have vane receiving pockets 38, each pocket having a bottom 40. Vane 22 extends into pocket 38 with the pocket then filled with a potting compound such as silicon rubber. The surface 44 is formed substantially flush with surface 46 which is the gas path bounding surface formed by an upstream extension of seal support 32. The depth of this pocket is only sufficient to supply sufficient vane to shroud bond strength and damping of the vane.
Each bottom 40 has a plurality of circumferentially extending ribs 48 integral with the radial inside of the bottom and which extend radially inward from the vanes. The
radially inward end of each rib 50 is adhesively bonded to the seal support ring at the bond location.
Each rib is bonded to the seal support ring using an epoxy film adhesive. The adhesive actually bonds not only underneath the ribs but forms a fillet along the edge. This actually forms a stronger seal than the surface contact seal of the prior art since the fillet may take load in shear. Furthermore any peeling that does occur does not spread throughout the entire structure. Each shroud section 36 also has an axially and radially extending end wall 52 which is also adhesively bonded to the support ring. Additional ribs 54 are located on the end walls to increase bond strength.
The location of the air flowpath is dictated by the aerodynamics, while the preferred location of the rotor structure is dictated by the structural design of the rotor. Particularly at the first stage and last stage of a compressor section there can be substantial radial distance between the rotor and the air flowpath. In the prior art the pocket was made sufficiently deep to absorb this difference. Here the pocket is made only deep enough to supply the required bond strength and dampening, and then of course filled with the potting compound. The ribs 48 have open spaces 56 therebetween resulting in a lower weight overall. The spaees 58 between the pockets are of course still open as they were in the prior art.
Seal support ring 32 is formed of a composite material, preferably a laminated structure comprising a plurality of polyamide fabric plies impregnated with thermosetting epoxy resin. This seal support ring extends radially outward at extension 58 and then upstream with part 60 forming the bounding surface 46 of the air flowpath.
This stator assembly at a downstream location in the compressor with seal support 34 is better shown in Figure 4. Here the seal support is a segmented circular ring formed of flat aluminum, or more precisely cylindrical segments. In a similar manner a plurality of shroud sections 62 receive the end 64 of vane 22 and are filled with silicon rubber 66 to supply the necessary strength. Inwardly and circumferentially extended ribs 68 are located on the bottom 70 of each shroud section 62. The aluminum support ring segments are adhesively secured to the ribs and the abrasive seal 20 is secured to the inside surface of the seal support ring.
A lighter weight structure is obtained which has a stronger bond.
Claims
1. A stator assembly defining a compressor axial flowpath comprising: a full ring seal support ring, having a radially outwardly facing surface and a radially inwardly facing surface; an abradable air seal secured to the radially inwardly facing surface of said seal support ring; an outer vane support structure; a circumferential row of vanes, the outer end of each vane rigidly secured to said outer vane structure; a plurality of arcuate inner shroud sections, each having a plurality of vane receiving pockets, each pocket having a bottom; said vanes extending into said pockets and imbedded in a potting compound within said pockets; a plurality of circumferentially extending ribs integral with the radial inside of each bottom and extending radially inwardly therefrom; and the radially inward end of said ribs adhesively bonded to said seal support ring at a bond location.
2. A stator assembly as in claim 1 further comprising: a radially extending end wall at each circumferential end of each of said plurality of shroud sections; and said end walls also adhesively bonded to said seal support ring.
3. A stator assembly as in claim 2 further comprising: a plurality of radially extending ribs integral with each end wall.
4. A stator assembly as in claim 1 wherein: said seal support ring is formed of a composite, and extends radially outward upstream of said bond location, and then upstream forming the bounding surface of the air flowpath.
5. A stator assembly as in claim 1 further comprising: said seal support ring formed of a flat aluminum ring.
6. A stator assembly defining a compressor axial flowpath comprising: an arcuate seal support, having a radially outwardly facing surface and a radially inwardly facing surface; an abradable air seal secured to the radially inwardly facing surface of said seal support; an outer vane support structure; a circumferential row of vanes, the outer end of each vane rigidly secured to said outer vane structure; a plurality of arcuate inner shroud sections, each having a plurality of vane receiving pockets, each pocket having a bottom; said vanes extending into said pockets and imbedded in a potting compound within said pockets; a plurality of circumferentially extending ribs integral with the radial inside of each bottom and extending radially inwardly therefrom; and the radially inward end of said ribs adhesively bonded to said seal support at a bond location.
7. A stator assembly as in claim 6 wherein: said arcuate support is formed of a composite full ring, and extends radially outward upstream of said bond location, and then upstream forming the bounding surface of the air flowpath.
8. A stator assembly as in claim 6 further comprising: said arcuate seal support formed of a plurality of segments forming a ring; and each segment is formed of an arcuate flat aluminum.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95911096A EP0749520B1 (en) | 1994-03-01 | 1995-02-24 | Compressor stator assembly |
DE69501155T DE69501155T2 (en) | 1994-03-01 | 1995-02-24 | GUIDE GRID FOR A COMPRESSOR |
JP52255595A JP3628328B2 (en) | 1994-03-01 | 1995-02-24 | Compressor stator assembly |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US203,958 | 1994-03-01 | ||
US08/203,958 US5380155A (en) | 1994-03-01 | 1994-03-01 | Compressor stator assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995023910A1 true WO1995023910A1 (en) | 1995-09-08 |
Family
ID=22755988
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/002307 WO1995023910A1 (en) | 1994-03-01 | 1995-02-24 | Compressor stator assembly |
Country Status (5)
Country | Link |
---|---|
US (1) | US5380155A (en) |
EP (1) | EP0749520B1 (en) |
JP (1) | JP3628328B2 (en) |
DE (1) | DE69501155T2 (en) |
WO (1) | WO1995023910A1 (en) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6203273B1 (en) * | 1998-12-22 | 2001-03-20 | United Technologies Corporation | Rotary machine |
US6148518A (en) * | 1998-12-22 | 2000-11-21 | United Technologies Corporation | Method of assembling a rotary machine |
US6425736B1 (en) * | 1999-08-09 | 2002-07-30 | United Technologies Corporation | Stator assembly for a rotary machine and method for making the stator assembly |
US6343912B1 (en) * | 1999-12-07 | 2002-02-05 | General Electric Company | Gas turbine or jet engine stator vane frame |
RU2302534C2 (en) * | 2001-12-11 | 2007-07-10 | Альстом (Свитзерлэнд) Лтд. | Gas-turbine device |
DE10348290A1 (en) | 2003-10-17 | 2005-05-12 | Mtu Aero Engines Gmbh | Sealing arrangement for a gas turbine |
US7604455B2 (en) * | 2006-08-15 | 2009-10-20 | Siemens Energy, Inc. | Rotor disc assembly with abrasive insert |
US8500394B2 (en) | 2008-02-20 | 2013-08-06 | United Technologies Corporation | Single channel inner diameter shroud with lightweight inner core |
FR2928963B1 (en) * | 2008-03-19 | 2017-12-08 | Snecma | TURBINE DISPENSER FOR A TURBOMACHINE. |
EP2196629B1 (en) * | 2008-12-11 | 2018-05-16 | Safran Aero Boosters SA | Segmented composite shroud ring of an axial compressor |
US8966756B2 (en) | 2011-01-20 | 2015-03-03 | United Technologies Corporation | Gas turbine engine stator vane assembly |
US9121283B2 (en) | 2011-01-20 | 2015-09-01 | United Technologies Corporation | Assembly fixture with wedge clamps for stator vane assembly |
US8966755B2 (en) | 2011-01-20 | 2015-03-03 | United Technologies Corporation | Assembly fixture for a stator vane assembly |
US8777793B2 (en) | 2011-04-27 | 2014-07-15 | United Technologies Corporation | Fan drive planetary gear system integrated carrier and torque frame |
US9038366B2 (en) | 2012-01-31 | 2015-05-26 | United Technologies Corporation | LPC flowpath shape with gas turbine engine shaft bearing configuration |
US20130192198A1 (en) | 2012-01-31 | 2013-08-01 | Lisa I. Brilliant | Compressor flowpath |
US10400629B2 (en) | 2012-01-31 | 2019-09-03 | United Technologies Corporation | Gas turbine engine shaft bearing configuration |
US8863491B2 (en) | 2012-01-31 | 2014-10-21 | United Technologies Corporation | Gas turbine engine shaft bearing configuration |
US9322337B2 (en) | 2012-06-20 | 2016-04-26 | United Technologies Corporation | Aerodynamic intercompressor bleed ports |
US9434031B2 (en) | 2012-09-26 | 2016-09-06 | United Technologies Corporation | Method and fixture for airfoil array assembly |
CN104314620A (en) * | 2014-10-28 | 2015-01-28 | 东方电气集团东方汽轮机有限公司 | Fixed blading structure for turbine |
BE1022930A9 (en) * | 2015-04-07 | 2016-12-14 | Techspace Aero Sa | PREFORM DRAPING FOR AXIAL TURBOMACHINE COMPRESSOR COMPOSITE BOX |
US10934943B2 (en) | 2017-04-27 | 2021-03-02 | General Electric Company | Compressor apparatus with bleed slot and supplemental flange |
US10669894B2 (en) | 2018-01-26 | 2020-06-02 | Raytheon Technologies Corporation | Annular retention strap |
US20190234222A1 (en) * | 2018-01-30 | 2019-08-01 | United Technologies Corporation | Angled vane slot |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3442442A (en) * | 1966-12-02 | 1969-05-06 | Gen Electric | Mounting of blades in an axial flow compressor |
GB2110768A (en) * | 1981-12-01 | 1983-06-22 | Rolls Royce | Fixings for stator vanes |
US4655682A (en) * | 1985-09-30 | 1987-04-07 | United Technologies Corporation | Compressor stator assembly having a composite inner diameter shroud |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2640679A (en) * | 1950-03-21 | 1953-06-02 | Gen Motors Corp | Turbine or compressor stator ring |
US3319930A (en) * | 1961-12-19 | 1967-05-16 | Gen Electric | Stator assembly for turbomachines |
-
1994
- 1994-03-01 US US08/203,958 patent/US5380155A/en not_active Expired - Lifetime
-
1995
- 1995-02-24 WO PCT/US1995/002307 patent/WO1995023910A1/en active IP Right Grant
- 1995-02-24 DE DE69501155T patent/DE69501155T2/en not_active Expired - Lifetime
- 1995-02-24 EP EP95911096A patent/EP0749520B1/en not_active Expired - Lifetime
- 1995-02-24 JP JP52255595A patent/JP3628328B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3442442A (en) * | 1966-12-02 | 1969-05-06 | Gen Electric | Mounting of blades in an axial flow compressor |
GB2110768A (en) * | 1981-12-01 | 1983-06-22 | Rolls Royce | Fixings for stator vanes |
US4655682A (en) * | 1985-09-30 | 1987-04-07 | United Technologies Corporation | Compressor stator assembly having a composite inner diameter shroud |
Also Published As
Publication number | Publication date |
---|---|
DE69501155D1 (en) | 1998-01-15 |
DE69501155T2 (en) | 1998-07-02 |
US5380155A (en) | 1995-01-10 |
EP0749520A1 (en) | 1996-12-27 |
EP0749520B1 (en) | 1997-12-03 |
JP3628328B2 (en) | 2005-03-09 |
JPH09509715A (en) | 1997-09-30 |
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