EP4590938A1 - Carter inter-turbines pour turbomachine, ensemble de turbomachine, turbomachine et méthode de positionnement d'une aube séparatrice au sein d'un carter inter-turbines - Google Patents
Carter inter-turbines pour turbomachine, ensemble de turbomachine, turbomachine et méthode de positionnement d'une aube séparatrice au sein d'un carter inter-turbinesInfo
- Publication number
- EP4590938A1 EP4590938A1 EP23790709.2A EP23790709A EP4590938A1 EP 4590938 A1 EP4590938 A1 EP 4590938A1 EP 23790709 A EP23790709 A EP 23790709A EP 4590938 A1 EP4590938 A1 EP 4590938A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inter
- separator
- turbine casing
- turbine
- vanes
- 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
- 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
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
-
- 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
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
- F01D5/146—Shape, i.e. outer, aerodynamic form of blades with tandem configuration, split blades or slotted blades
-
- 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
- F05D2220/321—Application in turbines in gas turbines for a special turbine stage
- F05D2220/3213—Application in turbines in gas turbines for a special turbine stage an intermediate stage of the turbine
-
- 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
- F05D2260/96—Preventing, counteracting or reducing vibration or noise
- F05D2260/961—Preventing, counteracting or reducing vibration or noise by mistuning rotor blades or stator vanes with irregular interblade spacing, airfoil shape
Definitions
- This presentation generally concerns an inter-turbine casing for a turbine vane frame type turbomachine (TVF, for turbine blade structure) fulfilling the function of turbine distributor in such a turbomachine.
- VDF turbine vane frame type turbomachine
- a turbomachine comprises an inter-turbine casing arranged between the high pressure turbine casing and the low pressure turbine casing in a turbomachine.
- the inter-turbine casing comprises a fairing (or fairing in English) comprising an internal shroud and an external shroud, which together delimit the flow path between the high-pressure turbine and the low-pressure turbine, as well as arms which extend radially between the internal ferrule and the external ferrule.
- the inter-turbine casing has both an aerodynamic function, as a stator making it possible to deflect the incident flow coming from the high-pressure turbine, and a structural function to transmit mechanical forces between the internal shroud and the external shroud. , and an integration function for the passage of easements.
- the fairing can therefore have a multi-profile configuration and include, in addition to the arms, separator vanes (or “splitters” in English) which have a reduced chord size in comparison with the arms, which are thicker and have a larger chord. long. The separating vanes and the downstream part of the arms thus ensure the aerodynamic function, while the arms ensure the structural and integration functions.
- the wakes generated by the blades of the inter-turbine casing are particularly wide and energetic.
- the significant differences in profile between the arms and the separating vanes cause significant differences in wakes which lead to the appearance of significant distortions in the flow. downstream of the inter-turbine casing, these distortions being likely to disrupt the performance of the low pressure turbine (aerodynamic losses, appearance of separations), to impact its mechanical strength (periodic excitations) or even to pose integration problems of the low pressure turbine (size of the low pressure turbine).
- the present presentation concerns an inter-turbine casing for a turbomachine, comprising an internal shroud, centered on a central axis, an external shroud, surrounding the internal shroud coaxially, a plurality of arms, each arm extending between the internal shroud and the external shroud, having a leading edge and a trailing edge and having an axial chord at mid-height, and at least one set of N separator vanes positioned circumferentially between two successive arms, each separator vane extending between the inner shell and the outer shell, having a leading edge and a trailing edge and having an axial chord at mid-height shorter than the axial chord at mid-height of the arms, in which said two successive arms define a reference position for each of said N separator vanes, these reference positions being regularly spaced circumferentially between the two successive arms, and in which at least one separator vane of said set of N separator vanes is offset circumferentially relative to its reference position.
- the separator vanes are not all arranged regularly between the arms.
- the invention is the result of technological research aimed at significantly improving the performance of turbomachines and, in this sense, contributes to reducing the environmental impact of the aeronautics sector.
- the plurality of arms comprises between 4 and 20 arms.
- the arms are distributed regularly around the central axis. Their distribution is therefore axisymmetric.
- all the arms have the same profile.
- At least one arm is hollow, said at least one arm comprising a passage allowing the passage of an easement of the turbomachine.
- said set of N separator vanes comprises between 1 and 4 separator vanes.
- the inter-turbine casing comprises a set of separator vanes between each successive arm.
- each set of separator vanes comprises the same number of separator vanes.
- the separator vanes are arranged in the same manner, relative to each other, in each set of separator vanes.
- the configuration of each set of separating blades that is to say the combination of the respective arrangements of each of their blades, constitutes the same pattern which is repeated identically between arms.
- all the separator vanes have the same profile.
- the axial chord at mid-height of the separator vanes is at least 2 times shorter, preferably at least 3 times shorter, than the axial chord at mid-height of the arms.
- the maximum thickness of the separator vanes is less than the maximum thickness of the arms.
- the maximum thickness of the separating vanes is at least 2 times shorter, preferably at least 3 times shorter, than the maximum thickness of the arms.
- the profile of at least one downstream portion of the separating vanes is identical to the profile of a downstream portion of the arms.
- the aerodynamic behaviors of the arms and the separating vanes are thus analogous, at least near their trailing edges, which reduces flow distortions.
- the trailing edges of the separator vanes are aligned circumferentially around the central axis with the trailing edges of the arms.
- leading edges of the separating vanes are arranged further downstream than the leading edges of the arms.
- At least one separator vane of said set of N separator vanes adjacent to an arm is offset circumferentially relative to its respective reference position. This is preferably the case for the two separating blades of the game adjacent to an arm. This helps reduce distortions caused by the difference in arm profile.
- all the separator vanes of said set of N separator vanes are offset circumferentially relative to their respective reference positions.
- the circumferential offset of said at least one separator blade which is offset circumferentially relative to its reference position is less in absolute value than 0.25 x Aref, where Aref is the angular difference between two consecutive reference positions.
- no separator blade has a circumferential offset relative to its reference position greater, in absolute value, than this ceiling. Indeed, the inventors determined that the optimal offset zone was located in this range.
- At least one separator vane of said set of N separator vanes has a thickness different from the other separator vanes of said set of N separator vanes. Consequently, in such a case, the stacking in trace BF (trailing edge) of the cross sections of the blade in question does not overlap with the stacking in trace BF of the cross sections of the arm.
- At least one separator vane of said set of N separator vanes has a different geometry, in particular by presenting a different stacking law, from the other separator vanes of said set of N separator vanes.
- the stacking in trace BF trailing edge of the cross sections of the blade in question does not overlap with the stacking in trace BF of the cross sections of the arm.
- the present presentation also relates to a turbomachine assembly, comprising an inter-turbine casing according to any of the preceding embodiments, and a turbine extending downstream of the inter-turbine casing and comprising at least one movable blade. extending radially.
- the present presentation also relates to a turbomachine, comprising a turbomachine assembly according to any of the preceding embodiments.
- the present presentation also relates to a method of positioning a separator blade within an inter-turbine casing according to any of the preceding embodiments, comprising the following steps: providing an inter-turbine casing, positioning separator vanes within the inter-turbine casing in their respective reference positions; evaluate a parameter of the flow passing through the inter-turbine casing on either side of a given separating blade and determination of a reference distortion of this parameter; move said given separator vane into one or more azimuthal positions offset circumferentially relative to its reference position; and for each of these shifted azimuthal positions:
- the flow parameter is evaluated as a function of the azimuthal position in a downstream radial plane.
- the step of evaluating the flow parameter after displacement is carried out for several different offset positions of the given separating vane within an exploration range.
- the exploration range has an amplitude greater than 0.1 x Aref and less than 0.25 x Aref, where Aref is the angular difference between two consecutive reference positions.
- these steps are repeated successively for each separator vane of said set of N separator vanes.
- the flow parameter evaluated is the flow rate or the flow angle relative to the central axis.
- the terms “longitudinal”, “transverse”, “lower”, “upper” and their derivatives are defined in relation to the main direction of the blades;
- the terms “axial”, “radial”, “tangential”, “interior”, “exterior” and their derivatives are defined in relation to the central axis of the inter-turbine casing, that is to say the the main axis of the turbomachine; we mean by “axial plane” a plane passing through the main axis of the turbomachine and by “radial plane” a plane perpendicular to this main axis;
- the terms “upstream” and “downstream” are defined in relation to the circulation of the air in the turbomachine;
- the terms “front” and “back” are understood in the circumferential direction when progressing clockwise.
- Figure 1 is an axial sectional plan of a turbomachine according to the invention.
- Figure 2 is a sectional view of a turbomachine assembly comprising an example of an inter-turbine casing and a turbine.
- Figure 3 is a partial perspective view of the example of a turbomachine assembly in Figure 2.
- Figure 4 is a graph representing the flow rate as a function of the azimuthal position for a reference configuration and an offset configuration.
- Figure 5 is a graph representing the flow angle as a function of azimuthal position for the reference configuration and the offset configuration of Figure 4.
- a dual-flow turbomachine 1 (typically, an aircraft turbomachine 1) generally comprises, from upstream to downstream in the direction of gas flow, a fan 2, an annular primary flow vein I and an annular secondary flow vein II.
- the mass of air sucked in by the fan 2 is thus divided into a primary flow, which circulates in the primary flow vein I, and into a secondary flow, which is concentric with the primary flow and circulates in the flow vein secondary II.
- the primary flow stream I passes through a primary body comprising one or more stages of compressors, for example a low pressure compressor 3 and a high pressure compressor 4, a combustion chamber 5, one or more stages of turbines, for example example a high pressure turbine 6 and a low pressure turbine 7 separated by an inter-turbine casing 8, and a gas exhaust nozzle.
- the upstream and downstream are defined in relation to the normal flow direction of the gases in the turbomachine 1.
- the X axis is the axis of rotation of the turbine rotor. low pressure 7, which coincides with the extension axis of the turbomachine 1.
- An axial direction corresponds to the direction of the X axis
- a radial direction is a direction perpendicular to this X axis and passing through it.
- a circumferential direction corresponds to a direction perpendicular to the X axis and not passing through it.
- the inter-turbine casing 8 comprises an internal shroud 9 and an external shroud 10 substantially coaxial with the axis X, and a fixed blade comprising a plurality of arms 11 together forming a crown.
- the arms 11 extend from the internal ferrule 9 to the external ferrule 10 and can be substantially radial with respect to the axis 9 and the external shell 10, which is housed in an aerodynamically shaped wall.
- the aerodynamic wall thus makes it possible to straighten the flow at the outlet of the high pressure turbine 6 and to improve the supply of the low pressure turbine 7, which is located immediately downstream of the inter-turbine casing 8.
- the inter-turbine casing 8 may in particular comprise between four and twenty arms 11.
- the inter-turbine casing 8 comprises ten arms 11.
- these arms 11 are regularly spaced around the axis provided between each arm 11.
- the chord of each separator vane 12 is shorter than the chord of each arm 11.
- the trailing edge 12f of each separator vane 12 is aligned circumferentially with the trailing edge 11f of each arm 11; consequently, the leading edges 11a of the arms 11 are positioned more upstream than the leading edges 12a of the separating vanes 12.
- the downstream part of the arms 11 has a profile corresponding to at least one downstream part of the separating vanes 12.
- the inter-turbine casing 8 can comprise between one and four separator vanes 12 between successive arms 11.
- every dawn set separator 12 comprises the same number of blades 12.
- three separator blades 12 are thus provided between each arm 11.
- the low pressure turbine 7 comprises, in a manner known per se, a plurality of turbine stages each comprising at least one movable blade 13.
- the low pressure turbine 7 may comprise at least three turbine stages, for example between three and five turbine stages in the case of a turbomachine whose fan 2 is driven via a reduction mechanism.
- the low pressure turbine 7 being conventional, it will not be further detailed here.
- Each arm 11 has an axial chord at mid-height 14.
- the axial chord at mid-height 14 of a given arm 11 is defined from a line at mid-height 15, which corresponds to the line ( fictitious) included in a plane perpendicular to the axis 11th of arm 11.
- the mid-height line 15 of a given arm 11 extends axially from the trailing edge of the row of fixed blades of the last stage of the high pressure turbine 6 immediately upstream of the inter-turbine casing 8 to the edge attack 12a of the moving blade 12 of the low pressure turbine 7 located immediately downstream of the inter-turbine casing 8.
- the axial chord at mid-height 13 then corresponds to the length of the straight line segment connecting points A and B , which correspond respectively to the projection on the axis intersection between the mid-height line 15 and the trailing edge 11 f of the arm 11.
- each separator vane 12 has an axial chord at mid-height measured by projecting onto the axis the separator blade 12, and at the intersection between the mid-height line 15 and the trailing edge 12f of the separator blade 12.
- the arm-blade distance 16 corresponds to the axial distance, measured at mid-height of the arm 11, between the trailing edge 11f of the arm 11 and the leading edge 13a of a movable blade 13 immediately in downstream of arm 11, that is to say at the length of the straight line segment connecting points B (defined above) and C, where the point C corresponds to the projection on the axis blade 16 can be measured for any moving blade 13 of the most upstream stage of the low pressure turbine 7 (generally referred to as "first stage" of the low pressure turbine), to the extent that the moving blades 13 are symmetrical in revolution around the axis leading edge 13a of the moving blade 13 is identical and coincides with point C.
- downstream plane TVF 17 which is the plane perpendicular to the axis vs.
- This method aims to adjust the azimuth, that is to say the angular position around the axis , that is to say the same combination of azimuths for each of their separating vanes 12: in other words, the i th separating vane 12 of a set is always located at the same angular distance from the arm 1 1 preceding it. Therefore, in this example, the method focuses on adjusting the azimuth of the separator vanes 12 of a single given set then the combination of azimuths obtained for this set will be reproduced identically for the other sets.
- a reference position is first calculated for each separating vane 12 of the set considered.
- This reference position corresponds to the position that the separator vane 12 would have in the classic configuration of equi-distribution around the axis the separator vanes 12 or between a separator vane 12 and its adjacent arm 1 1 is always equal.
- a digital simulation, or an experiment on a test bench, is then carried out in the reference configuration in order to measure the flow rate passing through the inter-turbine casing 8 as a function of the azimuthal position in the plane.
- downstream TVF 17 at least along the angular sector separating the two arms 11 framing the set of separating vanes 12 considered.
- the minimum 21 a corresponds to the reduction of the flow in the extension of the arm 11
- the minimum 21 b corresponds to the reduction of the flow in the extension of the first blade 12 -1, which allows you to identify the latter.
- the presence of arm 11 and blade 12-1 respectively causes flow peaks 21 c and 21 d on their intrados side.
- the flow distortion Dd between the front and the rear of the blade 12-1, constituting a reference distortion, is then measured between the maximum flow rate 21 e behind the first blade 12-1 in clockwise and minimum flow 21 hours ahead of first dawn 12-1 clockwise.
- several positions can be tested for the first blade 12-1 between the azimuth 6.75° and 11.25°.
- a digital simulation or an experiment on a test bench is again carried out in order to measure the flow rate passing through the inter-turbine casing 8 as a function of the azimuthal position in the downstream plane.
- TVF 17 at least on either side of the first dawn 12-1.
- curve 31 in Figure 5 represents the curve of the flow angle as a function of the azimuthal position in the downstream plane TVF 17 in the reference configuration
- curve 32 represents the curve of the angle of the flow in the offset configuration
- the minima 31 a and 32a make it possible to identify the arm 11 while the minima 31 b, 32b make it possible to identify the first blade 12-1.
- There distortion of the flow angle Da, Da' is measured between the maximum 31 e, 32e behind the first blade 12-1 and the maximum 31 h, 32h ahead of the first blade 12-1, in the clockwise. It can thus be noted that the offset of the first blade 12-1 made it possible to significantly reduce the angle distortion Da' compared to the angle distortion Da in the reference configuration.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2209448A FR3139854B1 (fr) | 2022-09-19 | 2022-09-19 | Carter inter-turbines |
| PCT/FR2023/051402 WO2024062179A1 (fr) | 2022-09-19 | 2023-09-15 | Carter inter-turbines pour turbomachine, ensemble de turbomachine, turbomachine et méthode de positionnement d'une aube séparatrice au sein d'un carter inter-turbines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4590938A1 true EP4590938A1 (fr) | 2025-07-30 |
Family
ID=84362488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23790709.2A Pending EP4590938A1 (fr) | 2022-09-19 | 2023-09-15 | Carter inter-turbines pour turbomachine, ensemble de turbomachine, turbomachine et méthode de positionnement d'une aube séparatrice au sein d'un carter inter-turbines |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4590938A1 (fr) |
| CN (1) | CN119895117A (fr) |
| FR (1) | FR3139854B1 (fr) |
| WO (1) | WO2024062179A1 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITTO20120517A1 (it) * | 2012-06-14 | 2013-12-15 | Avio Spa | Schiera di profili aerodinamici per un impianto di turbina a gas |
| EP2799721B8 (fr) * | 2013-05-03 | 2016-12-07 | Safran Aero Booster S.A. | Redresseur de turbomachine axiale avec aubes auxiliaires en pieds d'aubes |
-
2022
- 2022-09-19 FR FR2209448A patent/FR3139854B1/fr active Active
-
2023
- 2023-09-15 WO PCT/FR2023/051402 patent/WO2024062179A1/fr not_active Ceased
- 2023-09-15 CN CN202380066934.2A patent/CN119895117A/zh active Pending
- 2023-09-15 EP EP23790709.2A patent/EP4590938A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3139854A1 (fr) | 2024-03-22 |
| WO2024062179A1 (fr) | 2024-03-28 |
| CN119895117A (zh) | 2025-04-25 |
| FR3139854B1 (fr) | 2024-09-13 |
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