WO2023175256A1 - Procédé de maintenance d'une roue aubagée de turbine haute pression d'une turbomachine - Google Patents
Procédé de maintenance d'une roue aubagée de turbine haute pression d'une turbomachine Download PDFInfo
- Publication number
- WO2023175256A1 WO2023175256A1 PCT/FR2023/050308 FR2023050308W WO2023175256A1 WO 2023175256 A1 WO2023175256 A1 WO 2023175256A1 FR 2023050308 W FR2023050308 W FR 2023050308W WO 2023175256 A1 WO2023175256 A1 WO 2023175256A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- disc
- foil
- foot
- turbomachine
- Prior art date
Links
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
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/14—Adjusting or regulating tip-clearance, i.e. distance between rotor-blade tips and stator casing
-
- 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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
- F01D5/3092—Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers
-
- 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
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
Definitions
- TITLE Maintenance process for a high-pressure turbine bladed wheel of a turbomachine
- the invention relates to a method of maintaining a high-pressure turbine blade wheel of a turbomachine, such as a turbojet or an aircraft turboprop.
- Figure 1 represents a turbomachine 1 with double flow and double body.
- the axis of the turbomachine is referenced X.
- the terms axial and radial are defined in relation to the axis X.
- the turbomachine 1 comprises, from upstream to downstream in the direction of gas flow within the turbomachine 1, a fan 2, a low pressure compressor 3, a high pressure compressor 4, a combustion chamber 5, a high pressure turbine 6 and a low pressure turbine 7.
- the air coming from the fan 2 is divided into a primary flow A flowing in a primary vein 8, and a secondary flow B flowing in a secondary vein 9.
- the low pressure compressor 3, the high pressure compressor 4, the combustion chamber 5, the high pressure turbine 6 and the low pressure turbine 7 are provided in the primary stream 8.
- the high pressure turbine 6 and the high pressure compressor 4 are coupled in rotation via a first shaft 10 so as to form a high pressure body.
- the low pressure turbine 7, the low pressure compressor 3 and the fan 2 are coupled in rotation via a second shaft (not shown) so as to form a low pressure body.
- the high pressure turbine 6 conventionally comprises a disk 11 on which blades 12 are mounted.
- Each blade 12 comprises a blade 13 extending radially outwards from a blade root 14 mounted in a cell 15 of disc 11.
- the top 16 of the blade 12 is formed by the radially outer end of the blade 12.
- the root 14 and the blade 13 are here separated by a radially internal platform 17.
- the foot 14 has a general fir tree shape , here with four branches or lobes 18.
- the shape of the cell 15 is complementary to the shape of the foot 14.
- Each branch or lobe 18 rests on an opposing complementary surface of the disk 11.
- the surfaces of the foot 14 and of the disk 11 resting on each other are called bearing surfaces 19.
- the foot 14 has four spans 19, arranged symmetrically with respect to a median radial plane P.
- the blades 12 are surrounded by an annular casing 20.
- a clearance j is formed between the vertices 16 of the blades 12 and the casing 20 surrounding the blades 12.
- the first phenomenon is the wear of the tip of the blade generated by the friction between the tip of the blade and the casing facing it.
- the second phenomenon is thermal erosion, that is to say oxidation, of the top of the blade, due to the high temperatures to which the blade is subjected in operation, in particular in the case of a high turbine. pressure.
- the invention aims to remedy the aforementioned problems in a simple, reliable and inexpensive manner.
- the invention proposes a method of maintaining a high-pressure turbine bladed wheel of a turbomachine, extending along an axis, comprising a disc comprising cells, and blades extending radially and each comprising a blade and a radially internal base, the base of each blade being mounted in a cell of the disc, said base being supported on the disc via surfaces of the base and of the disc forming bearing surfaces, characterized in that at least one foil is removably mounted between the foot of at least one blade and the disc, at the level of the corresponding surfaces, said method comprising the following steps: measuring a radial clearance between the top of at least one blade, this that is to say the radially outer end of the blade, and a casing of the turbomachine located opposite the bladed wheel, if the radial clearance is greater than a determined value, remove said foil.
- the method according to the invention thus aims to determine the state of wear or deformation of the high pressure turbine by measuring the radial clearance between the top of the blade and the casing and, if the aforementioned radial clearance is too great, remove the foil. Removing the foil then makes it possible to reduce the radial clearance between the top of the blade and the casing, so as to return to acceptable performance, at lower cost, without replacing or repairing the blades or the casing.
- At least one foil can be mounted between the foot of each blade and the disc, at the level of the corresponding surfaces, all of the foils being removed if the radial clearance is greater than said determined value.
- the foil can be removably mounted on the blade base.
- the foil can be mounted removably on the disc, for example in the cell or on a tooth of the disc delimited between two adjacent cells.
- the foil may include a radial abutment surface, bearing on a complementary abutment surface of the root of the blade or the disc.
- Such a characteristic makes it possible to facilitate the correct axial positioning of the foil and also makes it possible to axially retain the foil in position during operation of the turbomachine.
- the foil can have a thickness of between 0.1 and 0.9 mm.
- the foil can be made from a cobalt-based alloy.
- the foil is for example made of an alloy known under the reference MP 159.
- the base of the blade can be a base in the general shape of a fir tree.
- Each foot can have a symmetrical shape relative to a median radial plane.
- a single foil can be mounted between the blade root and the disc. This single foil can be inserted between several spans of the blade and the disc.
- foils can be removably mounted between the foot of at least one blade and the disc.
- the foils can be arranged symmetrically with respect to the aforementioned median radial plane.
- Each foot can have two pairs of bearings, cooperating with two pairs of bearings of the alveolus of the disc.
- the foot can thus have the shape of a four-branched fir tree or four lobes, such a shape being frequently used in the case of a high-pressure turbine bladed wheel.
- the cell obviously has a complementary shape to that of the foot.
- the foil can be made by stamping sheet metal or by sintering a metal powder.
- the invention also relates to a high-pressure turbine bladed wheel comprising a disc comprising cells, and blades each comprising a blade and a root, the root of each blade being mounted in a cell of the disc, said foot being supported on the disc via surfaces of the foot and of the disc forming bearing surfaces, characterized in that at least one foil is removably mounted between the foot of at least one blade and the disc, at the level of the corresponding bearing surfaces.
- the bladed wheel is preferably a rotor bladed wheel.
- the foil is formed by a thin metal sheet.
- the invention also relates to a turbomachine, characterized in that it comprises a bladed wheel of the aforementioned type.
- the turbomachine can be an aircraft turbojet or turboprop engine.
- the aircraft may be an airplane.
- FIG. 1 is a schematic sectional view of a turbomachine of the prior art
- FIG. 2 is a schematic view of part of a high pressure turbine of the prior art
- FIG. 3 is a view illustrating the mounting of a blade root in a cell of a disk of a bladed wheel according to one embodiment of this document;
- FIG. 4 is a perspective view of a cell equipped with foil, according to the embodiment of Figure 3;
- FIG. 5 is a perspective view of a blade base equipped with two side foils, according to another embodiment
- FIG. 6 is a perspective view of a blade base equipped with a single foil, according to another embodiment
- FIG. 7 is a view corresponding to Figure 3, in which the foil has been removed following a maintenance operation.
- FIGs 3 and 4 illustrate a high pressure turbine rotor bladed wheel 6 according to one embodiment. This embodiment differs from that illustrated in Figure 2 in that a foil 21 is removably mounted in each cell 15 and covers entirely or almost entirely the internal surface of each of the cells 15 of the bladed wheel.
- the tinsel is removably mounted in each cell 15 and covers entirely or almost entirely the internal surface of each of the cells 15 of the bladed wheel.
- the foil 21 thus has a general shape in II and comprising recesses capable of housing the lobes 18 of the foot 14 of the corresponding blade 12.
- the foil 21 thus has surfaces
- surfaces 22 intended to come into contact with the surfaces of the root 14 of the blade 12. These surfaces are called surfaces 22 of the foil 21.
- the foil 21 is formed by a sheet of thickness between 0.1 and 0.9 mm, and made of a cobalt-based alloy.
- the foot 14 of the blade 12 comes to rest on the bearing surfaces 22 of the foil 21 after assembly in the cell 15.
- the radial position of the top 16 of the blade 12 takes into account the thickness of the foil 21 in its specifications so as to obtain the desired clearance j.
- foils 21 located on either side of the median plane P and arranged symmetrically, said foils 21 covering the surfaces 19 of the cell 15.
- Each foil 21 only covers half , or less, of alveolus 15.
- Figures 4 and 5 illustrate two embodiments in which the foils 21 are removably mounted, not in the cells 15, but on the feet 14 of the blades 12. The assembly formed by the blade root 14 and the or the foils 21 is then mounted in the corresponding cell 15 of the disc 11.
- FIG. 5 illustrates in particular an embodiment in which two side foils 21 are mounted on either side of the foot 14, symmetrically with respect to the median radial plane P.
- Each foil 21 has a shape complementary to the side blank of the foot 14, each foil 21 thus covers the two lateral surfaces 19 concerned of the foot 14 of the blade 12.
- Figure 6 illustrates an embodiment in which a single foil 21 covers the two lateral sides of the root 14 of the blade 12, that is to say covers all of the surfaces 19 of the foot 14.
- the foil 21 has a shape complementary to that of the foot 14 and comprises a radial wall 23 capable of forming an axial stop bearing against a radial end surface 24 of the foot 14, which can be an upstream surface or a downstream surface of the foot 14.
- the foil 21 does not cover the radially internal end surface 25 of the foot 14.
- cooling air circulation channels of the blade 12 open at this end surface 25 and it It is necessary not to block said channels.
- the foil 21 can cover said radially internal end surface 25 of the foot 14 but then comprises orifices or lights facing the outlets of said channels, so as to allow the passage of cooling air.
- this document proposes a method of maintaining such a high-pressure turbine bladed wheel 6, said method comprising a step during which the radial clearance j between the top 16 of the blade 12 and the casing 20 is measured and, if this radial clearance j is greater than a determined value, the foil(s) 21 are removed, as illustrated in Figure 7. This has the effect of bringing the blade tip 16 closer to the casing 20, and therefore reducing the set j of the value of the thickness of the foil 21.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP23713710.4A EP4493797A1 (fr) | 2022-03-18 | 2023-03-08 | Procédé de maintenance d'une roue aubagée de turbine haute pression d'une turbomachine |
US18/842,862 US20250198299A1 (en) | 2022-03-18 | 2023-03-08 | Method for maintaining a bladed wheel of a high-pressure turbine of a turbomachine |
CN202380025717.9A CN118829777A (zh) | 2022-03-18 | 2023-03-08 | 用于维护涡轮机的高压涡轮的带叶轮的方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2202428A FR3133640A1 (fr) | 2022-03-18 | 2022-03-18 | Procédé de maintenance d’une roue aubagée de turbine haute pression d’une turbomachine |
FRFR2202428 | 2022-03-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023175256A1 true WO2023175256A1 (fr) | 2023-09-21 |
Family
ID=82319618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2023/050308 WO2023175256A1 (fr) | 2022-03-18 | 2023-03-08 | Procédé de maintenance d'une roue aubagée de turbine haute pression d'une turbomachine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20250198299A1 (fr) |
EP (1) | EP4493797A1 (fr) |
CN (1) | CN118829777A (fr) |
FR (1) | FR3133640A1 (fr) |
WO (1) | WO2023175256A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02196105A (ja) * | 1989-01-23 | 1990-08-02 | Ishikawajima Harima Heavy Ind Co Ltd | ガスタービンディスク |
JPH07247804A (ja) * | 1993-01-07 | 1995-09-26 | General Electric Co <Ge> | ガスタービンエンジン用のロータ及び動翼アセンブリ、並びに多層被覆シム |
US20090016890A1 (en) * | 2007-07-13 | 2009-01-15 | Snecma | Turbomachine rotor assembly |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6502304B2 (en) * | 2001-05-15 | 2003-01-07 | General Electric Company | Turbine airfoil process sequencing for optimized tip performance |
FR2918702B1 (fr) * | 2007-07-13 | 2009-10-16 | Snecma Sa | Clinquant pour aube de turbomachine |
FR3027071B1 (fr) * | 2014-10-13 | 2019-08-23 | Safran Aircraft Engines | Procede d'intervention sur un rotor et clinquant associe |
-
2022
- 2022-03-18 FR FR2202428A patent/FR3133640A1/fr active Pending
-
2023
- 2023-03-08 EP EP23713710.4A patent/EP4493797A1/fr active Pending
- 2023-03-08 WO PCT/FR2023/050308 patent/WO2023175256A1/fr active Application Filing
- 2023-03-08 CN CN202380025717.9A patent/CN118829777A/zh active Pending
- 2023-03-08 US US18/842,862 patent/US20250198299A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02196105A (ja) * | 1989-01-23 | 1990-08-02 | Ishikawajima Harima Heavy Ind Co Ltd | ガスタービンディスク |
JPH07247804A (ja) * | 1993-01-07 | 1995-09-26 | General Electric Co <Ge> | ガスタービンエンジン用のロータ及び動翼アセンブリ、並びに多層被覆シム |
US20090016890A1 (en) * | 2007-07-13 | 2009-01-15 | Snecma | Turbomachine rotor assembly |
Also Published As
Publication number | Publication date |
---|---|
US20250198299A1 (en) | 2025-06-19 |
EP4493797A1 (fr) | 2025-01-22 |
FR3133640A1 (fr) | 2023-09-22 |
CN118829777A (zh) | 2024-10-22 |
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