EP4508311A1 - Pièce statorique à ailette dans une turbomachine - Google Patents
Pièce statorique à ailette dans une turbomachineInfo
- Publication number
- EP4508311A1 EP4508311A1 EP23722616.2A EP23722616A EP4508311A1 EP 4508311 A1 EP4508311 A1 EP 4508311A1 EP 23722616 A EP23722616 A EP 23722616A EP 4508311 A1 EP4508311 A1 EP 4508311A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fin
- point
- blade
- profile
- 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.)
- Granted
Links
Classifications
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- 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
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- 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
-
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
-
- 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
- F01D5/145—Means for influencing boundary layers or secondary circulations
-
- 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
- F05D2220/3216—Application in turbines in gas turbines for a special turbine stage for a special compressor stage
-
- 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
- F05D2220/36—Application in turbines specially adapted for the fan of turbofan 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
- F05D2240/10—Stators
- F05D2240/12—Fluid guiding means, e.g. vanes
-
- 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
- F05D2240/80—Platforms for stationary or moving blades
Definitions
- the invention relates to the stator parts of a turbomachine comprising a blade such as the flow rectifiers located downstream of a compressor and in particular the rectifiers with fixed timing.
- turbomachine In an aircraft turbomachine, and in particular aircraft intended for the transport of passengers, it is the air propelled by a fan and combustion gases leaving the turbomachine through an exhaust nozzle which exerts a reaction thrust on the turbomachine and, through it, on the aircraft.
- the circulation of gases through the turbomachine is influenced by rotating blades and fixed blades.
- Fixed or stator vanes include outlet guide vanes (also known as “Outlet Guide Vane” or “OGV” in English), inlet guide vanes (also known as “Inlet Guide Vane”). » or “IGV” in English), and variable pitch vanes (also known as “Variable Stator Vane” or “VSV” in English).
- the rectifier blades of a gas turbine aeronautical engine can each have two platforms (inner and outer) which are attached to the blade.
- the flow of gases generally takes place between the blades in an upstream-downstream direction. It is known, however, that the blade root zone can be the site of secondary aerodynamic flows.
- a corner separation also known under the term “corner separation” in English
- a vortex also known as a “corner vortex” in English
- This separation generates pressure losses as well as aerodynamic blocking. The latter is problematic in terms of operability.
- this corner separation amplifies to the point of causing a stall of the boundary layer on the blade which can no longer ensure flow deflection.
- An aim of the invention is to propose a stator part of a turbomachine whose geometry improves the flow of fluids compared to the prior art.
- stator part of a turbomachine comprising:
- each point of the intrados or respectively of the extrados defining a radial axis passing through the point, each plane comprising the radial axis defining a section of the intrados or respectively of the extrados, an angle defined in the plane between the foot profile and a tangent to the section at an intersection of the section and the foot profile being less than or equal to 45 degrees, the section being located between the foot profile and the tangent.
- the platform is a first platform, the part comprising a second platform so as to define the flow vein between the first platform and the second platform, the vein extending radially over a height of the vein, the fin extending radially over a fin height, a ratio of the fin height to the vein height being greater than or equal to 0.01 and less than or equal to 0.25;
- the blade comprises a leading edge and a trailing edge separated from a blade chord
- the fin comprising a plurality of stacked profiles radially between the fin root and the fin head, each profile defining a chord between the leading edge of the fin and the trailing edge of the fin, the chord of the head profile being lower than the chord foot profile; a ratio of the head profile chord to the blade chord being greater than or equal to 0.1 and less than or equal to 0.6; a ratio of the chord of the foot profile to the blade chord being greater than or equal to 0.3 and less than or equal to 1.1;
- each fin profile defines a maximum thickness of the profile between the intrados and the extrados in a direction perpendicular to a chord line, a ratio of the maximum thickness of the foot profile to the chord of the foot profile being greater or equal to 0.05 and less than or equal to 0.25; and a ratio of the maximum thickness of the head profile to the chord of the head profile being greater than or equal to 0.05 and less than or equal to 0.25;
- the blade comprises an intrados facing the extrados of the fin, the fin comprising a trailing edge, the trailing edge comprising a vanishing point located on the platform, a tangent to the trailing edge at the vanishing point extending from the platform away from the axis between the blade and a radial leakage plane passing through the axis and the leakage point;
- the trailing edge includes a point of asymmetry so that for any current point of the trailing edge located between the point of asymmetry and the vanishing point, a tangent to the trailing edge at the current point extends from the edge leakage moving away from the axis between the blade and a radial leakage plane passing through the axis and the current point;
- the invention also relates to a turbomachine comprising a stator part as has just been presented and to an aircraft comprising such a turbomachine.
- FIG. 1 is a schematic representation of a turbomachine
- FIG. 2 is a schematic representation of a stator part according to a first embodiment
- FIG. 3 is a schematic sectional view in a plane perpendicular to a radial axis of the turbomachine of a stator part according to the first embodiment
- FIG. 4 is a schematic sectional view in a plane perpendicular to the axis of the turbomachine of a stator part according to the first embodiment.
- a turbomachine is represented schematically, more specifically a dual flow axial turbojet 1.
- the turbojet 1 illustrated extends along an axis A and successively comprises, in the direction of flow of the gases in the turbomachine, a fan 2, a compression section which may include a low pressure compressor 3 and a high pressure compressor 4, a combustion chamber 5, and a turbine section which may include a high pressure turbine 6, a low pressure turbine 7 and an exhaust nozzle.
- blower 2 and the low pressure compressor 3 are driven in rotation by the low pressure turbine 7 via a first transmission shaft 9, while the high pressure compressor 4 is driven in rotation by the high pressure turbine 6 by via a second transmission shaft 10.
- a flow of air compressed by the low and high pressure compressors 3 and 4 feeds combustion in the combustion chamber 5, the expansion of the combustion gases drives the high and low pressure turbines 6, 7.
- air propelled by the fan 2 and the combustion gases leaving the turbojet 1 through an exhaust nozzle downstream of the turbines 6, 7 exert a reaction thrust on the turbojet 1 and, through it, on a vehicle or machine such than an aircraft (not shown).
- the turbomachine Downstream of the fan or a compression stage, the turbomachine may include a stage of straightening blades.
- a stage of straightening blades may include a stator part 20 as presented with reference to Figure 2.
- the stator part 20, or the set 20 of stator parts if it is not in one piece, has at least one blade 24, 26 and a platform 22 from which the blade 24, 26 extends.
- the stator part can for example include two adjacent blades 24, 26 which extend from the platform 22.
- the term "platform” here designates any element of the turbomachine from which blades 24, 26 are capable of being mounted.
- the platform can in particular be a hub or a casing which surrounds the axis of the turbomachine.
- the platform may have a cylindrical surface at a constant radial distance from the axis A of the turbomachine.
- Platform 22 has an internal wall or an external wall against which the air circulates, that is to say that the platform 22 defines a wall of a gas flow vein.
- the blades 24, 26 extend from the platform 22 in the vein either radially outwards moving away from the axis of the turbomachine A or radially inwards approaching the axis of the turbomachine A.
- Figure 2 is a schematic representation of the stator part 20 in perspective.
- Axis A of the turbomachine is shown oriented positively in the direction of gas flows in the turbomachine.
- Figure 2 also represents a radial axis r and a circumferential axis 0 passing through a point 34 of the platform 22.
- a radial axis r which is perpendicular to the axis A of the turbomachine and which passes through the point and the axis A of the turbomachine.
- the radial axis is positively oriented in the direction away from axis A of the turbomachine.
- circumferential axis 0 which passes through the point and which is perpendicular to the radial axis r and to the axis A of the turbomachine.
- the circumferential axis is positively oriented in the direction away from axis A of the turbomachine.
- the blades 24, 26 extend radially from the platform 22 moving away from the axis of the turbomachine, but the invention is not limited to this situation alone.
- Figure 3 is a schematic representation of the stator part 20 in a circumferential plane passing through the platform 22, a circumferential plane which is at a constant distance from the axis A of the turbomachine.
- a circumferential plane parallel to the axis A of the turbomachine makes it possible to define a section of the blades 24, 26
- the direction of axis A is given in Figure 3 by the axis x whose orientation is the direction of gas flow.
- the radial axis r is perpendicular to the plane of Figure 3 and directed towards the reader of Figure 3.
- Axis 0 corresponds to the circumferential direction perpendicular simultaneously to axis A and the radial axis.
- the blades 24 and 26 each have an intrados 624, 126 and an extrados 124, 626.
- the blades 24 and 26 each include a leading edge 224, 226 on the upstream side and a trailing edge 324, 326 on the downstream side.
- upstream and downstream are defined in relation to the general flow of gases through the turbomachine which takes place from upstream to downstream in the direction and direction of the axis A of the turbomachine.
- each blade has a camber line 43, 41 which is the curve equal to the average between the curve of the upper surface and the curve of the lower surface. More precisely, the camber line is formed by all points located equidistant from the extrados and the intrados. The distance from a particular point to the extrados (or intrados) is defined here as the minimum distance between the particular point and a point on the extrados (or intrados).
- the stator part 20 also includes a fin 28 which extends from the platform 22 in the same direction and the same direction of extension as the blade(s) 24, 26.
- the fin 28 extends in the vein radially relative to axis A of the turbomachine from platform 22.
- the fin 28 includes an upper surface 50 which faces the lower surface 126 of the blade 26.
- the fin 28 is located between the blades 24 and 26. More precisely, the fin 28 is located opposite the upper surface 124 of the first blade 24 and the lower surface 126 of the second blade 26.
- the fin 28 comprises an intrados 48 which faces the extrados 124 of the first blade and an extrados 50 which faces the intrados 126 of the second blade 26.
- the leading edge 30 comprises an attack point 34 located on the platform 22.
- the attack point 34 corresponds to the intersection of the leading edge 30 and the platform 22.
- a radial plane of attack is defined Pa which passes through axis A of the turbomachine and point of attack 34.
- Any radial plane includes the axis A of the turbomachine.
- the trailing edge 32 includes a vanishing point 36 located on the platform 22.
- the vanishing point 36 corresponds to the intersection of the trailing edge 32 and the platform 22.
- a radial plane of leakage Pf is defined which passes through the axis A of the turbomachine and the leak point 36.
- Figure 4 is a schematic representation in a Pr plane of certain parameters of the fin profile.
- Each point 100 of the lower surface 48 of the fin 28 or respectively of the upper surface 50 of the fin 28 defines a radial axis Ar passing through the point 100.
- the radial axis is orthogonal to the central axis A of the turbomachine and passes through the central axis A of the turbomachine.
- Each plane Pr comprising the radial axis Ar defines a section S of the lower surface 48 or respectively the upper surface 50.
- the plane Pr is defined by the direction of the radial axis Ar and any other direction of the plane such as the circumferential direction, the direction of the central axis A of the turbomachine, or another direction.
- the plane Pr can be a radial plane or not.
- this plane Pr we define a cutting plane of the intrados 48 if the point 100 belongs to the intrados 48, or a cutting plane of the extrados 50 if the point 100 belongs to the extrados 50.
- the cutting plane then defines a section of the intrados 48 or the extrados 50.
- the section S passes through the point 100 and through a point at the intersection 104 of the foot profile 44 and the intrados 48 or the extrados 50. This point is also at the intersection 104 of the section S and the foot profile 44.
- This angle 106 is less than or equal to 45 degrees.
- the section S is located between the foot profile 44 and the tangent T, that is to say that each point of the section S defines a radial axis and on this radial axis this point is located between a point of the foot profile 44 and a point of the tangent T.
- any section S as defined above is located between the platform 22 and a tangent T as presented above.
- the tangent is relatively close to the platform, in relation to the value of angle 106, the fin has a compact and pyramidal shape. This form allows you to act on:
- the upstream part of the fin has a relatively gentle slope relative to the platform 22. This reduces the risk of aerodynamic blockage even when this upstream part is located in the region of the smallest section of the vein most subject to the blocking. This is particularly advantageous at high Mach where too much solid blocking can induce shock waves.
- the slow evolution of the height makes it possible to avoid causing the first part of the flow to take off: the gases follow the lower surface of the fin and are thus guided to the trailing edge of the fin. Guiding this first part of the passage flow can locally cancel the transverse pressure gradient, which limits the stalling of the stator blades.
- point 100 is on the leading edge 30 or on the trailing edge 32 of the fin 28, point 100 is part of both the lower surface 48 and both of the extrados 50. The characteristics presented above are then verified for the intrados and for the extrados.
- Figure 4 represents the situation where the section S includes a point common to the head profile 46, but this is not necessarily the case.
- the platform 22 as described so far defines an interior radial or respectively exterior radial wall of the gas flow vein.
- stator part 20 When the stator part 20 corresponds to a streamlined architecture, it comprises a second platform located radially opposite the first platform 22, this second platform defining the outer radial wall or respectively inner radial wall of the gas flow path.
- the gas flow vein therefore passes radially between the first platform 22 and the second platform, the vein extending radially over a certain height of the vein designated by the reference Hv in Figure 4.
- stator part 20 When the stator part 20 corresponds to a non-streamlined architecture, it only includes a single platform 22 defining the interior radial wall of the gas flow path.
- the vein extends radially over a certain vein height defined by the height of the blades of the stator part 20, blades which project radially from the platform 20 towards the outside.
- the fin 28 extends radially over a fin height Ha indicated in Figure 4.
- a ratio of the fin height to the vein height being greater than or equal to 0.01 and less than or equal to 0.25.
- the fin described above may remain relatively small in height so as not to block the flow in the vein.
- Circumferential distance fin - first blade The first blade 24 and the second blade 26 are separated in a circumferential direction by a pitch 42.
- the pitch 42 which separates the blades is an angle separating a radial direction of the first blade 24 and a radial direction of the second blade 26.
- the pitch is fixed by the total number of blades playing the same role and having the same axial position as the blades 24 and 26 and which are located all around the axis A of the turbomachine.
- the distance separating the first blade 24 and the second blade is given by this angle and the radius at axis A at which we wish to evaluate this distance.
- the angular separation of the first blade 24 and the fin 28 in the circumferential direction can be freely chosen less than or equal to the angular pitch 42.
- the fin can be located between the first blade and the second blade at any distance from the first blade.
- the first blade 24 defines a blade chord 424 between its leading edge 224 and its trailing edge 324.
- the fin 28 can be modeled or represented as a stack of profiles in a radial direction between a fin base 44 and a fin head 46.
- the fin base 44 is located on the platform 22 and corresponds to the intersection of the fin 28 and the platform 22.
- the fin head is located at a distance from the platform 22 in the gas flow path.
- Each fin profile extends in a circumferential plane parallel to the axis A of the turbomachine, like a section of the fin made in this circumferential plane at constant radius or constant distance from the axis A, circumferential plane which can be qualified as a cutting plane.
- each fin profile defines a fin chord 54 between the leading edge 30 of the fin and the trailing edge 32 of the fin. More precisely, the fin chord 54 is defined between on the one hand a first point at the intersection of the leading edge 30 and the cutting plane and on the other hand a second point at the intersection of the trailing edge 32 and the cutting plane.
- the fin chord designates the length of the segment connecting the first point and the second point.
- the chord line designates the segment connecting the first point and the second.
- Each fin profile also defines a maximum thickness 52 between the lower surface 48 of the fin and the upper surface 50 of the fin in a direction perpendicular to the chord line.
- Each fin profile makes it possible to define a camber line which is the curve equal to the average between the curve of the upper surface 50 of the fin and the curve of the lower surface 48 of the fin. More precisely, in a given profile of the fin the camber line is formed of all the points located at equal distance between on the one hand the intersection of the extrados 50 and the cutting plane and on the other hand the intersection of the intrados 48 and the cutting plane.
- the camber line of the fin can be chosen close to the camber line of the first blade 24.
- chord of the head profile is lower than the chord of the foot profile
- a ratio of the head profile chord to the blade chord is greater than or equal to 0.1 and less than or equal to 0.6;
- a ratio of the chord of the foot profile to the chord of the blade is greater than or equal to 0.3 and less than or equal to 1.1.
- the root profile chord is then relatively large, which allows blocking of the passage flow over a large part of the chord length of the blade.
- a third optional variant of the most general embodiment and/or its variants comprises the following two characteristics:
- a ratio of the maximum thickness of the foot profile to the chord of the foot profile is greater than or equal to 0.05 and less than or equal to 0.25;
- the fin is then relatively thick, which facilitates its manufacture and its mechanical strength, particularly in the event of ingestion of particles or foreign bodies by the engine.
- a metal blade attack angle as the angle between the tangent to the camber line at the leading edge of the blade and the axis A of the turbomachine, the angle being oriented from the axis A towards the tangent
- a metal blade trailing angle as the angle between the tangent to the camber line at the trailing edge of the blade and the axis A, the angle being oriented from the axis A towards the tangent
- a metal blade attack angle such as the angle between the tangent 61 to the camber line at the leading edge of the fin and the axis A of the turbomachine, the angle being oriented from the axis A towards the tangent 61, and
- a metal fin trailing angle as the angle between the tangent 63 to the camber line at the trailing edge of the fin and the axis A, the angle being oriented from the axis A towards the tangent 63 .
- each fin point is associated with a reference point of a camber line 43 of a profile of the first blade 24, the reference point presenting the axial position and the radial position of the fin point.
- the fins described in this invention have metal angles close to the local camber angle at the leading edge and the trailing edge of the head profile and the foot profile. More precisely :
- the angle formed by a first tangent to the camber line of the fin head profile at the leading edge 30 and by a second tangent to the camber line of the profile of the first blade at the reference point associated with the edge d the attack of the fin head profile is less than or equal in absolute value to 10 degrees;
- the angle formed by a third tangent to the camber line of the fin head profile at the trailing edge 32 and a fourth tangent to the line camber of the profile of the first blade at the reference point associated with the trailing edge of the fin head profile is less than or equal in absolute value to 10 degrees;
- the angle formed by a seventh tangent to the camber line of the fin root profile at the vanishing point 36 and an eighth tangent to the camber line of the profile of the first blade at the reference point associated with the vanishing point 36 is less than or equal in absolute value to 10 degrees.
- the head profile and the root profile then present a metallic angle at the trailing edge whose value is close to the local camber of the blades. In this way the fin guides the flow at the trailing edge like the blades.
- the mid-chord point is located equidistant from the leading edge 30 of the fin and the trailing edge 32 of the fin.
- the axial coordinate of the mid-chord point can be chosen greater than or equal to an axial position of the leading edge 224 of the first blade and less than or equal to a sum of the axial position of the leading edge of the first blade and of the blade chord 424.
- the root profile of the fin is positioned axially in relation to the head profile thanks to the law of stacking of the fin which gives the relative positioning of the fin head profile in relation to the root profile of the fin. 'fin.
- the mid-chord point is chosen as the positioning reference for each profile of the stack.
- Two axes are defined:
- first axis “t” directed in the direction of the chord of the foot profile and oriented in the same direction as axis A of the turbomachine from upstream to downstream; - a second axis “n” perpendicular to the first axis “t” and oriented in the same direction as the circumferential axis 0 of the first blade 24 towards the second blade 26.
- an arrow angle (also known by the English term “sweep") which is the angle between the "t" axis, and a direction defined by the mid-chord point of the foot profile and the point at mid-chord of head profile;
- n a dihedral angle (also known by the English term “lean") which is the angle between the "n” axis, and the direction defined by the mid-chord point of the foot profile and the point at mid-chord of the head profile.
- the arrow and dihedral angles as just defined take values greater than or equal to - 10 degrees and less than or equal to + 10 degrees. These angles are sufficiently small for us to consider the axial position of the fin well described by an axial coordinate 78 of a mid-chord point 76 of a fin profile.
- a second embodiment depending on the most general mode or its first variant comprises the following characteristic.
- the fin 28 has a tangent to the trailing edge 32 at the vanishing point 36 which extends in the vein from the platform 22 between the second blade 26 and the radial trailing plane Pf.
- the edge trailing edge 32 is inclined at the vanishing point 36 towards the second blade 26. It should be noted that moreover this tangent to the trailing edge can have a non-zero projection along the axis A of the turbomachine
- the inclination towards the second blade on the trailing edge side allows a dihedral effect at the trailing edge which blocks the passage flow more effectively. This prevents the passage flow coming from the second blade 26 from going up the upper surface of the fin 28 and passing beyond the fin to reach the lower surface of the first blade 24.
- the fin is therefore "lying" on the trailing edge side so as to present a wall leaning towards the intrados of the second blade 26. This is the positive dihedral effect.
- the passing flow is then strongly pushed towards the lower surface of the second blade 26.
- the fin can have a trailing edge 32 which is straight and therefore coincides with the tangent to the trailing edge 32 at the vanishing point 36.
- the fin 28 may comprise a point of asymmetry and the following characteristic: at any current point of the trailing edge located between this point of asymmetry and the vanishing point 36, the tangent to the trailing edge which extends in the vein from the platform 22 is located between the second blade 26 and a radial plane passing the current point. In other words in a radial plane passing through the current point, the trailing edge moving away from the current point towards the point of asymmetry approaches the second blade 26. Formulated differently again, the trailing edge 32 is inclined between the leakage point 36 and the point of asymmetry towards the second blade 26.
- the trailing edge upstream of the point of asymmetry can be symmetrical, that is to say that each tangent to the trailing edge is contained in a radial plane which includes the axis of the turbomachine.
- the leading edge can also be symmetrical, that is to say that each tangent to the leading edge is contained in a radial plane which includes the axis of the turbomachine.
- the fin can be described as symmetrical upstream of the point of asymmetry and asymmetrical downstream.
- this point of asymmetry can be a first point of asymmetry and the fin can include a second point of asymmetry including this time on the leading edge.
- the tangent to the leading edge which extends in the vein from the leading edge is between the second blade 26 and the radial plane passing through the current point.
- the trailing edge moving away from the current point towards the head profile approaches the second blade 26.
- the leading edge 30 is inclined between the second point of asymmetry and the head profile towards the second blade 26
- the fin can then be described as symmetrical upstream of the second point of asymmetry and asymmetrical downstream.
- the second point of asymmetry can be the point of attack 34 at which the entire fin can be described as asymmetrical.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2203298A FR3134416A1 (fr) | 2022-04-11 | 2022-04-11 | Pièce statorique à ailette dans une turbomachine |
| PCT/FR2023/050507 WO2023198981A1 (fr) | 2022-04-11 | 2023-04-07 | Pièce statorique à ailette dans une turbomachine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4508311A1 true EP4508311A1 (fr) | 2025-02-19 |
| EP4508311B1 EP4508311B1 (fr) | 2026-02-25 |
Family
ID=82694221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23722616.2A Active EP4508311B1 (fr) | 2022-04-11 | 2023-04-07 | Pièce statorique à ailette dans une turbomachine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12560096B2 (fr) |
| EP (1) | EP4508311B1 (fr) |
| CN (1) | CN119183495A (fr) |
| FR (1) | FR3134416A1 (fr) |
| WO (1) | WO2023198981A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3134415B1 (fr) * | 2022-04-11 | 2024-02-23 | Safran | Pièce statorique à ailette dans une turbomachine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3014943B1 (fr) * | 2013-12-18 | 2019-03-29 | Safran Aircraft Engines | Piece de turbomachine a surface non-axisymetrique |
| US20180017079A1 (en) * | 2016-07-15 | 2018-01-18 | General Electric Company | Variable-cycle compressor with a splittered rotor |
| FR3059735B1 (fr) * | 2016-12-05 | 2020-09-25 | Safran Aircraft Engines | Piece de turbomachine a surface non-axisymetrique |
| FR3063118B1 (fr) * | 2017-02-21 | 2019-03-15 | Safran Aircraft Engines | Ensemble de pieces de turbomachine avec une aube de stator a plateforme integree et turbomachine correspondante |
| FR3105315B1 (fr) * | 2019-12-18 | 2022-02-18 | Safran Aircraft Engines | Module de compresseur pour turbomachine |
| FR3106614B1 (fr) * | 2020-01-23 | 2021-12-24 | Safran | Pièce ou ensemble de pièces de turbomachine |
-
2022
- 2022-04-11 FR FR2203298A patent/FR3134416A1/fr active Pending
-
2023
- 2023-04-07 CN CN202380040258.1A patent/CN119183495A/zh active Pending
- 2023-04-07 WO PCT/FR2023/050507 patent/WO2023198981A1/fr not_active Ceased
- 2023-04-07 US US18/855,940 patent/US12560096B2/en active Active
- 2023-04-07 EP EP23722616.2A patent/EP4508311B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US12560096B2 (en) | 2026-02-24 |
| EP4508311B1 (fr) | 2026-02-25 |
| FR3134416A1 (fr) | 2023-10-13 |
| WO2023198981A1 (fr) | 2023-10-19 |
| US20250327411A1 (en) | 2025-10-23 |
| CN119183495A (zh) | 2024-12-24 |
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