EP4448932A1 - Rotor de turbine et plateforme pour un tel rotor - Google Patents
Rotor de turbine et plateforme pour un tel rotorInfo
- Publication number
- EP4448932A1 EP4448932A1 EP22843857.8A EP22843857A EP4448932A1 EP 4448932 A1 EP4448932 A1 EP 4448932A1 EP 22843857 A EP22843857 A EP 22843857A EP 4448932 A1 EP4448932 A1 EP 4448932A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- blade
- upstream
- radial wall
- platform
- 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.)
- Pending
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
- 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
- F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
- F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates
-
- 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
- F01D5/32—Locking, e.g. by final locking blades or keys
- F01D5/323—Locking of axial insertion type blades by means of a key or the like parallel to the axis of the 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
- F01D11/005—Sealing means between non relatively rotating elements
- F01D11/006—Sealing the gap between rotor blades or blades 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
- F01D11/005—Sealing means between non relatively rotating elements
- F01D11/006—Sealing the gap between rotor blades or blades and rotor
- F01D11/008—Sealing the gap between rotor blades or blades and rotor by spacer elements between the blades, e.g. independent interblade platforms
-
- 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
- F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
-
- 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
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/32—Application in turbines in gas turbines
- F05D2220/323—Application in turbines in gas turbines for aircraft propulsion, e.g. jet engines
-
- 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
- F05D2240/20—Rotors
- F05D2240/24—Rotors for turbines
-
- 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
-
- 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
- TITLE Turbine rotor and platform for such a rotor.
- the invention lies in the field of aircraft turbomachines, such as a turbojet or a turboprop.
- the present invention relates to a turbomachine turbine rotor, in particular for an aircraft, and in particular a low-pressure turbine rotor comprising distinct blades and platforms.
- a turbine rotor comprises at least one rotor disc and a plurality of blades, distributed around the periphery of this disc.
- Each blade comprises a blade (that is to say the aerodynamic part of the blade), which is extended by a blade root and the rotor disc is provided at its periphery with a plurality of cells allowing each receiving a foot of dawn.
- the blades designed traditionally by the lost wax casting process include platforms which are directly linked to the base of the blade and which extend circumferentially around it.
- the air and hot gases from the combustion chamber pass through the blades of the turbine rotor.
- the platforms have the role of delimiting radially inwards, the circulation vein of the gases which cross this turbine.
- Blades in which the platform is separated from the blade are already known in the state of the art. This solves the aforementioned problem. However, it is then found that there are sealing problems between the platforms and the rotor disc on which the peripheral blades are mounted. DISCLOSURE OF THE INVENTION
- An object of the invention is therefore to guarantee the seal between these platforms and the cells of the rotor disk receiving the roots of the blades.
- Another object of the invention is to guarantee an easy assembly of the blades, the platforms and the rotor disc.
- the invention relates to an aircraft turbomachine turbine rotor, comprising a rotor disc and a plurality of blades distributed around the periphery of this disc, each blade comprising a blade and a blade root, this disc being provided at its periphery with a plurality of cells for receiving the root of a blade.
- this rotor comprises a plurality of platforms, each of which is inserted between two consecutive blades of the rotor, each blade comprises a coupling rib which extends in a circumferential direction from the base of the blade , the downstream end of the blade root comprises a blocking groove which opens radially outwards, each platform comprises a main wall, which is extended at its two axial ends by an upstream radial wall and by a downstream radial wall, the main wall of each platform comprises two longitudinal edges, each of these longitudinal edges comprising a groove for receiving part of the coupling rib of one of the two blades between which this platform is assembled, the height of each wall upstream radial wall is such that it extends radially inwards beyond the bottom of the cell, up to in front of the upstream face of the rotor disc, the downstream radial wall comprises a shoulder which opens radially inwards, and said rotor comprises an axial sealing and stop ring which cooperates with the locking groove of the blades and the shoulder of
- the upstream radial wall comprises an upstream spoiler which extends axially or substantially axially. Also preferably, said upstream spoiler is positioned on the upstream radial wall so as to be level with the slot of the rotor disc.
- the blade root must be positioned under the spoiler, in other words, the blade root must be arranged radially more inward, that is to say closer to the axis rotation of the rotor, than the spoiler. This results in positioning the blade root very far from the rotor air circulation stream and therefore very far from the blade. The result is a significant increase in the overall weight of the blade and difficulties in designing the attachment and the disc.
- the spoiler can be positioned at the desired height, while the blade root can be brought closer of the blade. This contributes to reducing the overall mass of the blade.
- downstream radial wall comprises a downstream spoiler which extends axially or substantially axially;
- the blade comprises a lower surface and an upper surface
- the coupling rib comprises a concave part on the lower surface of the blade and a convex part on the upper surface of the blade
- the longitudinal edge of the wall is convex and includes a convex groove which receives the concave portion of the coupling rib
- the longitudinal edge of the wall is concave and includes a concave groove which receives the convex portion of the coupling rib.
- the upstream radial wall has, on its downstream face, a groove for receiving a portion of an annular seal, arranged between this downstream face and the upstream face of the rotor disc;
- the main wall comprises a radially internal face and at least one stiffener which projects radially or substantially radially inwards from said radially internal face, two consecutive cells of the rotor disc are separated by a tooth and in that the end radially internal of the stiffener is in contact with the radially external face of the tooth;
- the vanes and/or the platforms are made of a ceramic-based composite material.
- the invention also relates to a platform for an aircraft turbine engine turbine rotor, which comprises a rotor disk and a plurality of blades distributed around the periphery of this disk, this rotor disk comprising an upstream face, each blade comprising a blade and a blade root, this disk being provided at its periphery with a plurality of cells for receiving the root of a blade and each blade comprising a coupling rib which extends in a circumferential direction from the base of the blade.
- this platform is intended to be inserted between two consecutive blades of said rotor, in that it comprises a main wall, which is extended at its two axial ends by an upstream radial wall and by a downstream radial wall, in that the main wall of the platform comprises two longitudinal edges, each of these longitudinal edges comprising a groove allowing the reception of a part of the coupling rib of one of the two consecutive blades between which this platform is intended to be inserted, in that the height of the upstream radial wall is such that when said platform is inserted between two consecutive blades of said rotor, said upstream radial wall extends radially inwards beyond the bottom of the cell, as far as in front of the upstream face of the rotor disk, and in that the downstream radial wall comprises a shoulder which opens radially inwards.
- the invention also relates to a turbine for an aircraft turbomachine, which comprises at least one rotor as mentioned above, the turbine preferably being a low pressure turbine.
- the invention relates to an aircraft turbomachine which comprises at least one turbine as mentioned above.
- FIG. 1 is a schematic view, in axial section, of a turbomachine according to the invention.
- FIG. 2 is a perspective view of part of a blade according to the invention, seen from the upstream side.
- FIG. 3 is a perspective view of part of a blade according to the invention, seen from the downstream side.
- FIG. 4 is a perspective view of a platform according to the invention.
- FIG. 5 is a perspective view of the platform of Figure 4, taken from another angle.
- FIG. 6 is a side view of the platform of figure 4.
- FIG. 7 is a perspective view of part of the rotor according to the invention, seen from the upstream side.
- FIG. 8 is a perspective view of part of the rotor according to the invention, seen from the downstream side.
- FIG. 9 is a view similar to that of Figure 8, in which an additional platform has been added.
- turbomachine In Figure 1, one can see an embodiment of a turbomachine according to the invention. This is a turbomachine with double flow and double body. However, it could be a turbine engine of another type, single-flow or single-spool, without departing from the scope of the invention.
- the turbomachine 1 has a central longitudinal axis X around which its various components extend. It comprises successively, from upstream to downstream, (the upstream and downstream being defined with respect to the direction F of gas flow through this turbomachine): a fan 10, a low pressure compressor 11, a high pressure compressor 12, a combustion chamber 13, a high pressure turbine 14 and a low pressure turbine 15.
- the air After having passed through the fan 10, the air is divided into a central primary flow 16 and a peripheral secondary flow 17.
- This primary flow 16 flows in a main gas circulation vein 18, successively crossing the compressors 11 and 12 , the combustion chamber 13 and the turbines 14 and 15.
- Each turbine comprises several successive stages, each of which comprises a distributor and a rotor 2.
- this rotor 2 comprises a rotor disc 3 and a plurality of vanes A, distributed circumferentially around this disc.
- the rotor disc 3 has a central longitudinal axis X1, which also constitutes its axis of rotation. When the rotor 2 is in place in the turbomachine, this axis X1 is collinear with the longitudinal axis X of the turbomachine.
- the rotor disc 3 also has an upstream face 32 and a downstream face 33.
- Each cell 30 preferably extends axially, that is to say along a longitudinal axis X2, parallel to the axis X1.
- Each cell 30 is intended to receive the root of a blade 4 and for this purpose has a shape complementarity therewith.
- each cell 30 has a cross section in the shape of a dovetail.
- Each blade 4 comprises a blade 40, which is extended by a stilt 41 then by a blade root 42.
- Each blade root 42 has a cross section, here in the shape of a dovetail, which allows it to be inserted axially into a cell 30.
- each blade root 42 has an upstream face 421 and a downstream face 422.
- the blade 40 has an intrados 401, an extrados 402, a leading edge 403 oriented on the upstream side of the rotor and a trailing edge 404.
- the blade 4 further comprises a coupling rib 43, which extends circumferentially around the base of the blade 40.
- base of the blade is meant the part of the blade located just next to the stilt 41 .
- the coupling rib 43 substantially matches the contour of the blade 40, and preferably also the rib 43 is perpendicular or substantially perpendicular to the profile of the blade, so that it comprises a concave part 431 and a convex part 432, respectively on the intrados side 401 of the blade and on the extrados side 402.
- the parts 431 and 432 of the rib 43 meet upstream, close to the leading edge 403 of the blade 40 and also meet downstream, close of the trailing edge 404 of the blade, so that the coupling rib 43 extends over the entire circumference of the blade 40.
- the parts 431 and 432 could also not meet near the leading edge 403 and/or near the trailing edge 404 of the blade
- the blade 4 includes another axial locking device 44 of the blade root 42 inside the cell 30 of the rotor disc 3.
- This axial locking device 44 comprises an axial tab 441, which extends axially from the lower part of the downstream face 422 of the blade root 42.
- the axial tab 441 comprises a locking groove 442 which opens radially outwards (with reference to the position that the blade 4 occupies when it is arranged on the rotor disc 3).
- the groove 442 extends perpendicular to the axis of the blade root 42.
- the rotor 2 further comprises a plurality of platforms 5, distinct from the blades 4 and which are arranged around the rotor disc 3, so that each platform 5 is inserted between two consecutive blades 4 of the rotor disc .
- the platform 5 comprises a main wall 50 which is extended at its two axial ends respectively by an upstream radial wall 51 and by a downstream radial wall 52.
- radial wall is meant a wall which is radial or substantially radial when the platform 5 is in its normal position of use, that is to say inserted between two consecutive blades of the rotor.
- the main wall 50 is inclined from upstream and from the bottom upwards and downstream. This makes it possible to have a strong vein slope, typical of the first stage of a fast low pressure turbine.
- the wall 50 could be inclined in the other direction or extend axially (without inclination).
- the main wall 50 includes two longitudinal edges 501 and 502.
- the longitudinal edge 501 is convex and the longitudinal edge 502 is concave.
- the respective degrees of curvature of the edges 501 and 502 are configured so that when a platform 5 is placed between two consecutive blades, its edge 501 matches the shape of the lower surface 401 of one of these two blades. and that its edge 502 matches the shape of the extrados 402 of the other of these two blades, so as to ensure the continuity of the main vein 18.
- the convex longitudinal edge 501 comprises a convex groove 503 for receiving the concave part 431 of the coupling rib 43 of one of the two blades 4 between which the platform 5 is arranged and the concave longitudinal edge 502 comprises a concave groove 504 for receiving the convex part 432 of the coupling rib 43 of the other of the two vanes 4 between which the platform 5 is arranged.
- the upstream radial wall 51 is of sufficient height H (see FIG. 5) so that when the platform 5 is in place on the rotor disc 3, as shown in FIG. 7, this wall 51 extends in front of a left or right half of the upstream opening of the cell 30 and also radially inwards, beyond the bottom of the cell 30, up to in front of a part of the upstream face 32 of the rotor disc 3
- This upstream radial wall 51 thus contributes to sealing at the level of the cells 30.
- the upstream radial wall 51 may have on its downstream face 510 (that is to say the one facing the rotor disc 3 when the platform 5 is in place), a groove 511 slightly arcuate, suitable for receiving a portion of an annular seal 6, which is pressed against the upstream face 32 of the disc 3.
- the upstream radial wall 51 is provided with an upstream spoiler 512 which extends axially or substantially axially upstream from the upstream face 513 of the radial wall 51 .
- downstream radial wall 52 is provided with a downstream spoiler 521, which extends axially or substantially axially downstream from the downstream face 522 of the radial wall 52.
- the platform 5 is independent of the blade 4 makes it possible to position the upstream spoiler 512 lower (that is to say closer to the axis X1) than the downstream spoiler 521 and this all the more so as the wall 50 is inclined, while having no impact on the position of the blade root 42. It is thus possible to keep a butt 41 of low height.
- the downstream radial wall 52 is also provided with a shoulder 523, provided on the upstream face 524 of the wall 52. This shoulder 523 opens radially inwards.
- the main wall 50 of the platform 5 comprises at least one stiffener 53 which projects inwards from its radially internal face 500.
- the platform 5 comprises two stiffeners 53. She could understand more.
- the stiffeners are perpendicular to the median longitudinal axis of the wall 50. This or these stiffeners could also be arranged along the median longitudinal axis of the wall 50 and be straight (s) or curved (s) to match the radius of curvature of the edges 501 and 502.
- the assembly of the various parts is advantageously carried out as follows:
- an axial sealing and stop ring 7 is then inserted, which is flat and annular, so that its radially inner edge is inserted into the grooves 442 of the axial lugs 441 of the blades 4 and that its radially outer edge is inserted into the shoulders 523 of the platforms 5.
- This sealing ring 7 can be provided with notches, not visible in the figures, to achieve an assembly by dog clutching or be made up of several annular portions, assembled end-to-end.
- Each blade 4 is thus stopped axially upstream by the radial upstream wall 51, which is itself stopped axially on the rotor disc 3, (see figure 7) and is stopped axially downstream by the ring 7.
- the blades 4 and the platforms 5 are made of composite material based on ceramics (CMC) and because they are distinct, this makes it possible to easily orient the fibers constituting them and to not have fibers to right angle between the blades and the platforms.
- CMC ceramics
- the blades 4 and the platforms 5 could also be made of metal without departing from the scope of the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2113806A FR3130907B1 (fr) | 2021-12-17 | 2021-12-17 | Rotor de turbine et plateforme pour un tel rotor. |
| PCT/FR2022/052351 WO2023111454A1 (fr) | 2021-12-17 | 2022-12-14 | Rotor de turbine et plateforme pour un tel rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4448932A1 true EP4448932A1 (fr) | 2024-10-23 |
Family
ID=81325959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22843857.8A Pending EP4448932A1 (fr) | 2021-12-17 | 2022-12-14 | Rotor de turbine et plateforme pour un tel rotor |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12410721B2 (fr) |
| EP (1) | EP4448932A1 (fr) |
| CN (1) | CN118401742A (fr) |
| FR (1) | FR3130907B1 (fr) |
| WO (1) | WO2023111454A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12352175B2 (en) | 2023-07-04 | 2025-07-08 | Rolls-Royce Plc | Annulus filler for a gas turbine engine |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5030063A (en) * | 1990-02-08 | 1991-07-09 | General Motors Corporation | Turbomachine rotor |
| US7284958B2 (en) * | 2003-03-22 | 2007-10-23 | Allison Advanced Development Company | Separable blade platform |
| GB2401655A (en) * | 2003-05-15 | 2004-11-17 | Rolls Royce Plc | A rotor blade arrangement |
| US7300253B2 (en) * | 2005-07-25 | 2007-11-27 | Siemens Aktiengesellschaft | Gas turbine blade or vane and platform element for a gas turbine blade or vane ring of a gas turbine, supporting structure for securing gas turbine blades or vanes arranged in a ring, gas turbine blade or vane ring and the use of a gas turbine blade or vane ring |
| US8382436B2 (en) * | 2009-01-06 | 2013-02-26 | General Electric Company | Non-integral turbine blade platforms and systems |
| US8251651B2 (en) * | 2009-01-28 | 2012-08-28 | United Technologies Corporation | Segmented ceramic matrix composite turbine airfoil component |
| US20120156045A1 (en) * | 2010-12-17 | 2012-06-21 | General Electric Company | Methods, systems and apparatus relating to root and platform configurations for turbine rotor blades |
| EP2778347A1 (fr) * | 2013-03-11 | 2014-09-17 | Siemens Aktiengesellschaft | Ensemble de pâle de rotor, turbomachine comprenant un ensemble de pâle de rotor et procédé d'assemblage d'un ensemble de pâle de rotor |
| US11028714B2 (en) * | 2018-07-16 | 2021-06-08 | Raytheon Technologies Corporation | Fan platform wedge seal |
| US10633986B2 (en) * | 2018-08-31 | 2020-04-28 | Rolls-Roye Corporation | Platform with axial attachment for blade with circumferential attachment |
| US11131203B2 (en) * | 2018-09-26 | 2021-09-28 | Rolls-Royce Corporation | Turbine wheel assembly with offloaded platforms and ceramic matrix composite blades |
| US11261744B2 (en) * | 2019-06-14 | 2022-03-01 | Raytheon Technologies Corporation | Ceramic matrix composite rotor blade attachment |
-
2021
- 2021-12-17 FR FR2113806A patent/FR3130907B1/fr active Active
-
2022
- 2022-12-14 CN CN202280083002.4A patent/CN118401742A/zh active Pending
- 2022-12-14 US US18/720,412 patent/US12410721B2/en active Active
- 2022-12-14 WO PCT/FR2022/052351 patent/WO2023111454A1/fr not_active Ceased
- 2022-12-14 EP EP22843857.8A patent/EP4448932A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN118401742A (zh) | 2024-07-26 |
| US12410721B2 (en) | 2025-09-09 |
| FR3130907A1 (fr) | 2023-06-23 |
| WO2023111454A1 (fr) | 2023-06-22 |
| US20250043687A1 (en) | 2025-02-06 |
| FR3130907B1 (fr) | 2023-11-10 |
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