WO2022258911A1 - Roue de rotor pour une turbomachine d'aéronef - Google Patents
Roue de rotor pour une turbomachine d'aéronef Download PDFInfo
- Publication number
- WO2022258911A1 WO2022258911A1 PCT/FR2022/051034 FR2022051034W WO2022258911A1 WO 2022258911 A1 WO2022258911 A1 WO 2022258911A1 FR 2022051034 W FR2022051034 W FR 2022051034W WO 2022258911 A1 WO2022258911 A1 WO 2022258911A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bulb
- disc
- wheel
- face
- cells
- Prior art date
Links
- 230000000295 complement effect Effects 0.000 claims description 8
- 230000004323 axial length Effects 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 101000582320 Homo sapiens Neurogenic differentiation factor 6 Proteins 0.000 claims description 3
- 102100030589 Neurogenic differentiation factor 6 Human genes 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 8
- 238000003754 machining Methods 0.000 description 4
- 238000009760 electrical discharge machining Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 210000003456 pulmonary alveoli Anatomy 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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
-
- 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
- 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
- F01D5/326—Locking of axial insertion type blades by other means
-
- 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
- F05D2260/00—Function
- F05D2260/30—Retaining components in desired mutual position
Definitions
- the present invention relates to a rotor wheel for an aircraft turbine engine.
- the technical background includes in particular the documents FR-A1-2 951 224, FR AI -3 049 643, US-A-2 755 062, EP-A1-3 594 450, EP-A1-3 647 545, FR -A1-
- a rotor wheel 10 such as that partially illustrated in Figure 1, comprises a disc 12 which has a main axis A representing the axis of rotation of the wheel, and which comprises cells 14 at its outer periphery.
- the cells 14 extend along the axis A and can be parallel to this axis or inclined with respect to the axis A. They are separated from each other by teeth 16 of the disc, these teeth being also called " interpales”.
- the cells 14 are generally formed by broaching or spark erosion and have a general dovetail or fir tree shape (with one or more lobes). Their axes along the A axis are called broaching axes.
- Each of the cells 14 has a bottom located between two lateral sides.
- the rotor wheel 10 also comprises vanes 22 which are mounted in the cells 14 of the disc 12.
- Each vane 22 comprises a blade 24 connected by a platform 26 to a foot 28 which is configured to be mounted by complementarity of shapes in one of the cells 14.
- Each of the teeth 16 of the disc has at its radially outer end a top 18 covered by the platforms 26 of two adjacent blades 22.
- each blade 22 comprises at its radially inner end a lobe 30, a first axial end of which comprises a circumferential notch 32 and of which a second axial end, opposite the first axial end, comprises a cleat 33 or hook oriented radially towards the interior (see figure 2).
- the rotor wheel 10 further comprises a split annular ring 34 engaged in the notches 32 of the blades and pressed axially against the disc 12.
- Figures 3-7 are detail views of a prior art rotor wheel 10.
- these blades 22 are intended to bear by their lugs 33 on the disc 12.
- the ring 34 bears axially on a face 12a of the disc 12, and the lugs 33 are in axial support on the opposite face 12b of the disc . In theory, this axial support is ensured by mounting the ring 34.
- Each of the vanes 22 is mounted on the outer periphery of the disc 12 by a “slide” connection. Once mounted, the blades 22 must be held axially on the disc 12 and the snap ring 34 ensures this immobilization. It is also important to seal this connection in particular to prevent gases from the rotor passage from flowing through this connection.
- the axial support of the lugs 33 of the blades 22 on the disc 12 makes it possible to ensure sealing in this zone between the blades 22 and the cells 14 of the disc.
- This sealing is of the axial type insofar as it is ensured by a bearing in the axial direction, i.e. parallel to axis A of the wheel or to the broaching axes of the cells.
- the blades 22 can move axially (of the order of a few tenths of a millimeter) and their cleats
- Axial sealing in the region of the cleat 33 of each blade 22 is thus no longer ensured. This phenomenon is accentuated because of the connections 38 of the sides 14b to the bottom 14a of the cells 14, and of the connections 40 of the cleat 33 on the sides of the foot, which are designed to ensure good axial support of the cleat 33 against the disc 12.
- Figures 6 and 7 illustrate leaks from the sliding connection in this area. These leaks introduce a bias in the model of the initial air system, and they induce a drop in the efficiency of the rotor and a difference in the temperature at the top of the disc.
- the present invention provides a solution to this problem, which is simple, efficient and economical.
- a disc having a main axis and having cells at its outer periphery, the cells extending along said axis and each having a bottom and two lateral sides,
- each of these blades comprising a blade connected by a platform to a root which is configured to be mounted by complementarity of shapes in one of the cells, the root of each of the blades comprising at its end radially a lobe whose first axial end comprises a circumferential notch and whose second axial end, opposite the first end, comprises a cleat oriented radially inwards and configured to come into axial abutment on a first face of the disc, and
- lobe of the root of each of the blades comprises, between the said first and second ends, a projecting bulb which is oriented radially inwards and configured to be in surface radial support on the bottom of the corresponding cell.
- the additional bulb of the root of each blade is also configured to be in radial bearing on the bottom of the cell of the reception of the foot in order to provide sealing in this zone by this radial support.
- the bulb remains in radial support on the bottom of the cell, which maintains and guarantees sealing in this area.
- radial support means the fact that two elements are in radial support on one another or the fact that these two elements are fitted to one another in the radial direction.
- surface support or “tight support” means the fact for an element or a surface to be supported on another element or another surface with at least three points of contact, this support being able to impart a seal between these elements or these surfaces.
- the wheel according to the invention may also have one or more of the following characteristics, taken alone or in combination with each other:
- said bulb has in cross section a shape complementary to a cross section of a part of the cell in which it is located.
- said bulb has an axial position Pbuibe on said lobe, measured along the axis and from the face of the disc on which said blade cleat rests, such that: p the axial position of the bulb on the blade root,
- said bulb has an axial position Pbuibe such that it is closer to said first end than to said second end
- said bulb has an axial length Lbuibe such that:
- said bulb has in cross section an area SBuibe such that:
- Stotaie_Disque the total area of a cross-section of an alveolus of the disc
- Spaie_pied the area of a cross-section of the foot outside the bulb without passing through the bulb
- said bulb comprises two radial faces, respectively upstream and downstream, which are interconnected by a convex curved face complementary to the bottom of the cell,
- the present invention also relates to a turbine engine, in particular for an aircraft, comprising at least one rotor wheel as described previously.
- Figure 1 is a partial schematic perspective view of a rotor wheel of an aircraft turbine engine
- Figure 1a is an enlarged view of part of Figure 1;
- Figure 2 is a partial schematic perspective view of a rotor blade
- Figure 3 is a partial schematic view in perspective and in axial section of a rotor wheel, the section passing through the root of a blade;
- Figure 4 is a partial schematic perspective view of a rotor wheel, seen from an upstream side here;
- Figure 5 is a partial schematic perspective view of a rotor wheel, seen from a downstream side here;
- Figure 6 is a partial schematic view in perspective and in section of a rotor wheel, and shows the passage sections around the bottom of a cell of the disc;
- FIG. 7 is a partial diagrammatic view in perspective of the passage section between a cleat of the root of a blade and the disc;
- Figure 8 is a schematic perspective view of a blade for a rotor wheel according to the invention.
- Figure 9 is a schematic view in perspective and in axial section of the rotor wheel comprising the blade of Figure 8;
- Figure 10 is an enlarged view of part of Figure 9;
- Figure 11 is a partial schematic perspective view of a disc and shows the cross-sectional area of one of its cells;
- FIG. 12 is a partial schematic perspective view of a disc and shows the cross-sectional areas of the root of a blade housed in one of the slots of the disc; and
- FIG. 13 is a partial schematic perspective view of a rotor wheel and shows a line of flight between the root of a blade and a cavity of the disc.
- FIGS 1 to 7 have been described in the foregoing and illustrate the context of the invention, one embodiment of which is illustrated in Figures 8 to 13.
- the invention relates to a rotor wheel 10 which is partially shown in Figures 11 and 13.
- This wheel 10 comprises a disc 12 which, as in Figure 1, has a main axis A (not visible) representing the axis of rotation of the wheel.
- Disc 12 includes cells 14 at its outer periphery.
- the cells 14 extend along the axis A and are separated from each other by teeth 16.
- the cells 14 are generally formed by broaching or electroerosion (EDM) and have a general dovetail shape or fir tree (with one or more lobes).
- EDM electroerosion
- Each of the cells 14 has a bottom 14a located between two lateral sides 14b.
- Each of the teeth 16 of the disc has at its radially outer end a vertex 18.
- the rotor wheel 10 also comprises vanes 22 which are mounted in the cells 14 of the disc 12.
- Each vane 22 comprises a blade 24 connected by a platform 26 to a foot 28 which is configured to be mounted by complementarity of shapes in one of the cells 14.
- Each blade 22 may further comprise a heel.
- the root 28 of each blade 22 comprises at its radially inner end a lobe 30, a first axial end of which, here downstream, comprises a circumferential notch 32 and a second axial end of which, here upstream, comprises a cleat 33 or hook oriented radially towards the interior (see figure 8).
- the rotor wheel 10 further comprises a split annular ring 34 engaged in the notches 32 of the blades and pressed axially against the disc 12, and in particular against a downstream face 12a of the disc 12.
- Each of the vanes 22 is mounted on the outer periphery of the disc 12 by a “slide” connection. Once mounted, the blades 22 must be maintained axially on the disk 12 and the ring 34 ensures this immobilization. It is also important to seal this connection in particular to prevent gases from the rotor passage from flowing through this connection.
- this sealing is ensured even if the blade 22 moves axially in operation according to the mounting clearances, that is to say whatever the axial position of the blade 22 in the cell 14 corresponding.
- the lobe 30 of the foot 28 of each of the blades 22 comprises, between the notch 32 and the tab 33, a projecting bulb 42 which is oriented radially inwards and configured to rest sealed radial or adjusted in the radial direction on the bottom 14a of the cell 14 corresponding.
- the bulb 42 preferably has in cross section a shape complementary to a cross section of a part of the cell 14 in which it is located.
- the bulb 42 comprises an upstream radial face 42a and a downstream radial face 42b. These faces 42a, 42b are interconnected by a concave curved surface 42c complementary to the bottom 14a of the cell 14 and bearing radially or adjusted against this bottom 14.
- the downstream face 42b is connected to the notch 32 by a face 42d which is inclined here in the example shown. In this way, the face 42d makes it possible in particular to facilitate the machining of the bulb 42.
- FIG. 10 illustrates the axial position of bulb 42 on root 26 or lobe 30, measured along axis A and from face 12b of disk 12 on which cleat 33 or hook of the blade rests.
- the axial position Pbuibe is such that: p the axial position of the bulb on the blade root (measured along axis A), k ⁇ a axial length of the blade root (measured along axis A),
- (r// may be greater than or equal to 0.1 or 0.7, and (p//c)2 may be less than or equal to 0.9 or 0.3.
- the parameters (p/Ar) 1 and (p//c) 2 indicate in particular a range of values (without unit of measurement) for an axial position of the bulb Pbuibe.
- the range of values of the parameters (p//c)i and (p//c)2 can correspond to the axial position of the bulb with respect to the axial length of the blade root. This range of values can be between 0.1 and 0.9.
- the axial position Pbuibe is between 0.1 and 0.3 and/or between 0.7 and 0.9. This makes it possible to facilitate the machining of the bulb 42, for example by a grinding wheel, which does not interfere with the cleat 33.
- FIG. 9 illustrates the bulb 42 has an axial position of between 0.7 and 0.9.
- the bulb 42 has an axial position Pbuibe such that it is closer to said first end of the foot comprising the notch 32 than to said second end of the foot comprising the cleat 33 or hook.
- the bulb 42 has an axial length Lbuibe such that:
- FIGS. 11 and 12 show that the bulb 42 has in cross section a shape complementary to a shape in cross section of the cell 14 in which this bulb 42 is located.
- the air in the SBuibe bulb can be defined as:
- Stotaie_Disque the total area of a cross-section of a disc cell (figure 11),
- Spaie_pied the area of a cross-section of the foot outside the bulb without passing through the bulb (figure 12).
- the bulb 42 located in the cell 14 may not have an exactly complementary shape in cross section.
- the area of the bulb SBuibe can be defined as:
- the sealing thus obtained is said to be radial because it is no longer materialized by a flat support of the cleat or hook on the disc.
- the manufacture of a blade as described above can be carried out as follows:
- the bulb is made with a conventional means of grinding but compared to the rest of the foot with a different shape wheel and a different tool path due to the interference of the shapes in the broaching axis, machining of the disc slots is obtained by broaching or by wire EDM cutting.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22734658.2A EP4352336A1 (fr) | 2021-06-08 | 2022-05-31 | Roue de rotor pour une turbomachine d'aéronef |
CN202280039989.XA CN117425764A (zh) | 2021-06-08 | 2022-05-31 | 用于飞行器涡轮发动机的转子轮 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2106011 | 2021-06-08 | ||
FR2106011A FR3123682A1 (fr) | 2021-06-08 | 2021-06-08 | Roue de rotor pour une turbomachine d’aéronef |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022258911A1 true WO2022258911A1 (fr) | 2022-12-15 |
Family
ID=77913178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2022/051034 WO2022258911A1 (fr) | 2021-06-08 | 2022-05-31 | Roue de rotor pour une turbomachine d'aéronef |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4352336A1 (fr) |
CN (1) | CN117425764A (fr) |
FR (1) | FR3123682A1 (fr) |
WO (1) | WO2022258911A1 (fr) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2755062A (en) | 1951-07-13 | 1956-07-17 | Bristol Aeroplane Co Ltd | Blade-locking means for turbine and the like rotor assemblies |
GB2452515A (en) | 2007-09-06 | 2009-03-11 | Siemens Ag | Seal coating for rotor blade and/or disc slot |
FR2951224A1 (fr) | 2009-10-13 | 2011-04-15 | Turbomeca | Roue de turbine equipee d'un jonc de retenue axiale verrouillant des pales par rapport a un disque |
FR3043133A1 (fr) | 2015-10-30 | 2017-05-05 | Turbomeca | Aube de turbomachine comprenant un pied etage et traverse par des cavites d'air de refroidissement |
FR3049643A1 (fr) | 2016-03-31 | 2017-10-06 | Turbomeca | Roue a pales rapportees et turbomachine equipee d'une telle roue |
EP3594450A1 (fr) | 2018-07-09 | 2020-01-15 | Rolls-Royce plc | Pale pour moteur de turbine à gaz |
EP3647545A1 (fr) | 2018-10-31 | 2020-05-06 | United Technologies Corporation | Ensemble de pales de turbine, moteur à turbine à gaz associé et procédé de |
-
2021
- 2021-06-08 FR FR2106011A patent/FR3123682A1/fr active Pending
-
2022
- 2022-05-31 WO PCT/FR2022/051034 patent/WO2022258911A1/fr active Application Filing
- 2022-05-31 CN CN202280039989.XA patent/CN117425764A/zh active Pending
- 2022-05-31 EP EP22734658.2A patent/EP4352336A1/fr active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2755062A (en) | 1951-07-13 | 1956-07-17 | Bristol Aeroplane Co Ltd | Blade-locking means for turbine and the like rotor assemblies |
GB2452515A (en) | 2007-09-06 | 2009-03-11 | Siemens Ag | Seal coating for rotor blade and/or disc slot |
FR2951224A1 (fr) | 2009-10-13 | 2011-04-15 | Turbomeca | Roue de turbine equipee d'un jonc de retenue axiale verrouillant des pales par rapport a un disque |
FR3043133A1 (fr) | 2015-10-30 | 2017-05-05 | Turbomeca | Aube de turbomachine comprenant un pied etage et traverse par des cavites d'air de refroidissement |
FR3049643A1 (fr) | 2016-03-31 | 2017-10-06 | Turbomeca | Roue a pales rapportees et turbomachine equipee d'une telle roue |
EP3594450A1 (fr) | 2018-07-09 | 2020-01-15 | Rolls-Royce plc | Pale pour moteur de turbine à gaz |
EP3647545A1 (fr) | 2018-10-31 | 2020-05-06 | United Technologies Corporation | Ensemble de pales de turbine, moteur à turbine à gaz associé et procédé de |
Also Published As
Publication number | Publication date |
---|---|
EP4352336A1 (fr) | 2024-04-17 |
FR3123682A1 (fr) | 2022-12-09 |
CN117425764A (zh) | 2024-01-19 |
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