US20090060745A1 - Shim for a turbomachine blade - Google Patents
Shim for a turbomachine blade Download PDFInfo
- Publication number
- US20090060745A1 US20090060745A1 US12/171,736 US17173608A US2009060745A1 US 20090060745 A1 US20090060745 A1 US 20090060745A1 US 17173608 A US17173608 A US 17173608A US 2009060745 A1 US2009060745 A1 US 2009060745A1
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- United States
- Prior art keywords
- shim
- operating temperature
- turbomachine
- branches
- layer
- 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.)
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Classifications
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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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
- F04D29/322—Blade mountings
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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
- 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
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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
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
- F01D5/3092—Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/501—Elasticity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/506—Hardness
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- 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
- the invention relates to shim for a turbomachine blade, the shim being of the type comprising two branches that are to come against the bearing surfaces of a blade root, together with a base part interconnecting the branches.
- the shim can be used with any type of turbomachine whether terrestrial or for aviation purposes (turbojet, turboprop, terrestrial gas turbine, etc.).
- turbomachine whether terrestrial or for aviation purposes (turbojet, turboprop, terrestrial gas turbine, etc.).
- the shim of the invention can be used for the fan blades, or for the moving blades of the low pressure compressor (or “booster”), or for the high pressure compressor, or for the high pressure turbine, or for the low pressure turbine of the turbojet.
- the axial direction corresponds to the direction of the axis A of the rotor of the turbomachine
- the radial direction is a direction perpendicular to the axis A.
- adjectives such as “inner” and “outer” are used relative to a radial direction in such a manner that the (radially) inner portion of an element is closer to the axis A than is the (radially) outer portion of the same element.
- a rotor disk i.e. a disk secured to the rotor
- the (moving) blades are fastened to the disk by attachment systems, which may be constituted by shank-type fasteners that may be rectilinear or curvilinear, hammerhead-shaped, or Christmas-tree-shaped.
- attachment systems may be constituted by shank-type fasteners that may be rectilinear or curvilinear, hammerhead-shaped, or Christmas-tree-shaped.
- Such fastener systems can be described as devices in which the blade roots form the male portions of the system and are held radially in the female portions of the system that are formed in the outer periphery of the disk and that are commonly known as “slots”.
- the blades When the rotor is set into rotation, the blades are subjected mainly to centrifugal forces and also to axial aerodynamic forces, and the blade roots are pressed in abutment against portions of the disk lying on either side of the outer opening of each slot, under the effect of centrifugal forces.
- the surfaces of the blade roots and of the disks that come into abutment against each other are commonly referred to as “bearing surfaces”. These bearing surfaces are subjected to pressure (as a result of said forces applied to said bearing surfaces). To a first approximation, it can be estimated that this pressure depends on the square of the speed of rotation of the rotor.
- anti-wear solutions can be adopted, i.e. solutions that slow down the appearance of wear at the contact interfaces, and these solutions include those based on inserting a third body, referred to as “shim”, between the blade roots and the disk.
- the shim serves in particular to double the number of contact interfaces (going from a single blade/disk interface to a pair of interfaces, blade/shim and shim/disk), and to reduce the relative movements between the parts that are in contact, thus enabling wear to be reduced in operation.
- shim of the above-mentioned type is described in document FR 2 890 684. That shim is made entirely out of metal, and it is constituted by a sheet of metal that is folded appropriately.
- An object of the invention is to provide a shim that is more effective than the above-mentioned known shim in terms of performing the “anti-wear” function, so as to provide better protection to the bearing surfaces of the blades and of the disk.
- a shim for a turbomachine blade comprising two branches for coming against bearing surfaces of the blade rotor, and a base part interconnecting the branches, the shim being characterized in that it presents, at least in its branches, a multilayer structure having at least three layers that are fastened to one another and superposed in the following order: a first layer of a first material; a second layer of a second material; and a third layer of a third material that is optionally different from the first material, said first and third materials presenting respective first and third Young's moduluses of values E and E′ at any arbitrary operating temperature in the operating temperature range of the shim, and said second material presenting a second Young's modulus of value lying in the range E/20 to E/5 and in the range E′/20 to E′/5 at said operating temperature.
- operating temperature is used to mean the temperature to which the shim is subjected while the turbomachine is in operation under normal conditions of use.
- the relationship between said first, second, and third Young's moduluses, as defined above, needs to be satisfied for all of the temperatures in the range of operating temperatures of the shim.
- the shim belongs to the fan or to the low pressure compressor of a bypass two-spool airplane turbojet
- its operating temperature lies in the range 20° C. to 150° C.
- the high pressure compressor of a bypass two-spool airplane turbojet its operating temperature lies in the range 150° C. to 500° C.
- the high pressure turbine of a bypass two-spool airplane turbojet its operating temperature lies in the range 400° C. to 700° C.
- the present invention thus relates to adopting said multilayer structure in which the (isotropic or anisotropic) elasticity characteristics of the second material are better than the (isotropic or anisotropic) elasticity characteristics of the first and third materials in the desired operating temperature range.
- said first and third materials are the same or different metal alloys or organic matrix composite materials, while said second material is non-metallic.
- the second material may be made of rubber, of silicone, of polyimide, of glass, or of epoxy resin.
- the invention also provides a turbomachine rotor assembly comprising: a rotor disk presenting slots in its outer periphery; blades fastened via their roots in said slots; and shims according to the invention, each branch of each shim being disposed between the bearing surface of a blade root and the corresponding bearing surface of the disk.
- the invention also provides a turbomachine including such a rotor assembly.
- FIG. 1 is a fragmentary exploded and diagrammatic view of a turbomachine rotor assembly comprising a rotor disk, an example of shim of the invention, and a blade root;
- FIG. 2 is a radial section view on plane II-II showing the FIG. 1 assembly once it has been assembled;
- FIG. 3 is a section view analogous to that of FIG. 2 , showing another example of shim of the invention.
- FIG. 4 is a section view analogous to that of FIG. 2 , showing another example of shim of the invention, placed between two adjacent slots.
- FIGS. 1 and 2 show: a rotor disk 2 having numerous grooves or “slots” 4 in its periphery that define housings, each suitable for receiving the root 16 of a blade 14 , the root 16 being surrounded by a shim 20 .
- the blade root 16 and the fan disk 2 are made out of titanium alloy, for example.
- assemblies also exist (not shown) that have a spacer placed between the blade root 16 and the bottom of the slot 4 .
- the blades 14 When the disk 2 is set into rotation, the blades 14 are subjected to centrifugal forces, and the bearing surfaces 16 A on the blade root 16 become pressed against bearing surfaces 22 A of the disk 2 .
- the surfaces 16 A constitute the flanks of the blade root 16
- the surfaces 22 A constitute the bottom faces of the lip-shaped portions 22 of the disk that extend on either side of the outer opening of each slot 4 .
- the shim 20 comprises two side branches 20 A for coming against the bearing surfaces 16 A of the blade root 16 , and a base part 20 B, here a base plate, interconnecting the branches and extending under the blade root 16 .
- the shim 20 constitutes a wear piece and its main function is to limit wear of the blade root 16 and of the fan disk 2 .
- the shim 20 presents a multilayer structure in its branches 20 A and its base part 20 B, which structure comprises three layers 31 , 32 , 33 that adhere to one another. These three layers are superposed in the following order going from the blade root 16 towards the disk 2 : a first layer 31 of a first material; a second layer 32 of a second material; and a third layer 33 of a third material.
- the third material is identical to the first material, so that they present the same first Young's modulus.
- the first Young's modulus has a corresponding value E
- said second material presents a second Young's modulus with a value lying in the range E/20 to E/5.
- the shim 20 must present a certain amount of stiffness in order to perform its mechanical function and its anti-wear function, such that the value of E is preferably greater than or equal to 110,000 megapascals (MPa) for metal shim (e.g. 210,000 MPa for shim made of a nickel-based superalloy, of the type sold under the name “Inconel”), and greater than or equal to 70,000 MPa for shim made of organic matrix composite material.
- MPa megapascals
- the rotor assembly belongs to the fan or the low pressure compressor of a bypass two-spool airplane turbojet, it is subjected to operating temperatures lying in the range 20° C. to 150° C.
- the first material can be selected as a Ni-based superalloy with more than 15% by weight Fe and Cr, such as the superalloy sold under the name “Inconel 718”; while the second material can be rubber (natural or synthetic).
- the first material it is also possible for the first material to be a composite material using an epoxy resin matrix with reinforcing fibers, e.g. made of carbon; the second material could then be an epoxy resin on its own (with the difference in Young's modulus between the first and second materials being associated with the absence of fibers).
- the assembly belongs to the high pressure compressor of a bypass two-spool airplane turbojet, it is subjected to operating temperatures lying in the range 150° C. to 500° C. Under such circumstances, and by way of example, it is possible to select for the first material a Ni-based superalloy having more than 15% by weight of Fe and Cr, such as the superalloy sold under the name “Inconel 718”; the second material could be a silicone or polyimide.
- the assembly belongs to the high pressure turbine of a bypass two-spool airplane turbojet, it is subjected to operating temperatures lying in the range 400° C. to 700° C.
- the first material to be selected as an Ni-based superalloy with more than 15% by weight Fe and Cr, such as the superalloy sold under the name “Inconel 718”; the second material may be glass (which in this operating temperature range presents viscoelastic behavior).
- said layers 31 , 32 , 33 can be fastened to one another in various ways, and in particular:
- Said layers may be integral with one another to form said multilayer structure, and the fastening that is obtained must naturally be sufficiently secure to prevent the structure becoming delaminated in operation and to prevent the layer 32 from creeping.
- FIG. 3 is a section view analogous to that of FIG. 2 showing another element of a shim 120 of the invention. Elements or element portions that are analogous between FIGS. 2 and 3 are identified by the same reference numerals plus 100 .
- FIG. 3 differs from that of FIG. 2 in that the base part 120 B of the shim 120 is formed by the first and second layers 131 and 133 joined to each other. Only the branches 120 A of the shim present a multilayer structure made up of the first, second, and third layers 131 , 132 , and 133 of the invention. It should be observed that the base part 120 B of the shim could also be formed solely by the third layer 133 , or indeed solely by the first layer 131 .
- FIG. 4 is a section view analogous to that of FIG. 2 showing another example of a shim 220 of the invention. Elements or element portions analogous between FIGS. 2 and 4 are identified with the same numerical references plus 200 .
- FIG. 4 differs from that of FIG. 2 in that the base part 220 B of the shim 220 extends over the outer periphery of the rotor disk 202 between two adjacent slots 204 , with each branch 220 A of the shim penetrating into a slot 204 and being housed between the bearing surface 216 A of the blade root 216 and the corresponding bearing surface 222 A of the disk 202 .
- the shim 220 presents a multilayer structure analogous to that of the shim 20 in FIG. 2 , having three layers 231 , 232 , 233 that are fastened to one another and superposed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Gasket Seals (AREA)
- Laminated Bodies (AREA)
Abstract
A shim (20) for a turbomachine blade (14), the shim comprising two branches (20A) for coming against bearing surfaces (16A) of the blade rotor (16), and a base part (20B) interconnecting the branches. The shim presents, at least in its branches (20A), a multilayer structure having at least three layers (31, 32, 33) that are fastened to one another and superposed in the following order: a first layer (31) of a first material; a second layer (32) of a second material; and a third layer (33) of a third material that is optionally different from the first material, said first and third materials presenting respective first and third Young's moduluses of values E and E′ at any arbitrary operating temperature in the operating temperature range of the shim, and said second material presenting a second Young's modulus of value lying in the range E/20 to E/5 and in the range E′/20 to E′/5 at said operating temperature.
Description
- The invention relates to shim for a turbomachine blade, the shim being of the type comprising two branches that are to come against the bearing surfaces of a blade root, together with a base part interconnecting the branches.
- The shim can be used with any type of turbomachine whether terrestrial or for aviation purposes (turbojet, turboprop, terrestrial gas turbine, etc.). In the particular circumstance of a bypass, two-spool airplane turbojet, the shim of the invention can be used for the fan blades, or for the moving blades of the low pressure compressor (or “booster”), or for the high pressure compressor, or for the high pressure turbine, or for the low pressure turbine of the turbojet.
- In the present application, the axial direction corresponds to the direction of the axis A of the rotor of the turbomachine, and the radial direction is a direction perpendicular to the axis A. Furthermore, unless specified to the contrary, adjectives such as “inner” and “outer” are used relative to a radial direction in such a manner that the (radially) inner portion of an element is closer to the axis A than is the (radially) outer portion of the same element.
- In a rotor disk (i.e. a disk secured to the rotor) of a turbomachine, that serves to carry blades, the (moving) blades are fastened to the disk by attachment systems, which may be constituted by shank-type fasteners that may be rectilinear or curvilinear, hammerhead-shaped, or Christmas-tree-shaped. Such fastener systems can be described as devices in which the blade roots form the male portions of the system and are held radially in the female portions of the system that are formed in the outer periphery of the disk and that are commonly known as “slots”.
- When the rotor is set into rotation, the blades are subjected mainly to centrifugal forces and also to axial aerodynamic forces, and the blade roots are pressed in abutment against portions of the disk lying on either side of the outer opening of each slot, under the effect of centrifugal forces. The surfaces of the blade roots and of the disks that come into abutment against each other are commonly referred to as “bearing surfaces”. These bearing surfaces are subjected to pressure (as a result of said forces applied to said bearing surfaces). To a first approximation, it can be estimated that this pressure depends on the square of the speed of rotation of the rotor.
- It can thus be understood that the variations in the speed of rotation of the rotor during an operating cycle of the turbomachine: from stationary to full throttle, passing through various particular intermediate speeds (idling, taxiing, cruising, descending, for an aviation turbomachine) give rise to variations in the pressure acting on the above-defined bearing surfaces. These pressure variations associated with elastic deformations of the contacting parts give rise to relative movements between the blade roots and the disk. When they are repeated, these relative movements, known as slip or as separation depending on their nature, give rise to wear phenomena in the bearing surfaces of the blades or of the disks. It is also possible for the dynamic movements of the blades at a given speed of rotation (response of the blades to alternating stresses of harmonic or transient nature) to contribute to the phenomenon of said bearing surfaces becoming worn. These wear phenomena are naturally penalizing on the lifetime of a turbomachine.
- Various so-called “anti-wear” solutions can be adopted, i.e. solutions that slow down the appearance of wear at the contact interfaces, and these solutions include those based on inserting a third body, referred to as “shim”, between the blade roots and the disk. The shim serves in particular to double the number of contact interfaces (going from a single blade/disk interface to a pair of interfaces, blade/shim and shim/disk), and to reduce the relative movements between the parts that are in contact, thus enabling wear to be reduced in operation.
- A known example of shim of the above-mentioned type is described in
document FR 2 890 684. That shim is made entirely out of metal, and it is constituted by a sheet of metal that is folded appropriately. - An object of the invention is to provide a shim that is more effective than the above-mentioned known shim in terms of performing the “anti-wear” function, so as to provide better protection to the bearing surfaces of the blades and of the disk.
- This object is achieved by a shim for a turbomachine blade, the shim comprising two branches for coming against bearing surfaces of the blade rotor, and a base part interconnecting the branches, the shim being characterized in that it presents, at least in its branches, a multilayer structure having at least three layers that are fastened to one another and superposed in the following order: a first layer of a first material; a second layer of a second material; and a third layer of a third material that is optionally different from the first material, said first and third materials presenting respective first and third Young's moduluses of values E and E′ at any arbitrary operating temperature in the operating temperature range of the shim, and said second material presenting a second Young's modulus of value lying in the range E/20 to E/5 and in the range E′/20 to E′/5 at said operating temperature.
- It should be noted that the Young's modulus of a material varies as a function of the temperature of the material, and consequently that the values E and E′ depend on temperature.
- The term “operating temperature” is used to mean the temperature to which the shim is subjected while the turbomachine is in operation under normal conditions of use. In the present invention, the relationship between said first, second, and third Young's moduluses, as defined above, needs to be satisfied for all of the temperatures in the range of operating temperatures of the shim.
- For example, when the shim belongs to the fan or to the low pressure compressor of a bypass two-spool airplane turbojet, its operating temperature lies in the
range 20° C. to 150° C. When it belongs to the high pressure compressor of a bypass two-spool airplane turbojet, its operating temperature lies in the range 150° C. to 500° C. When it belongs to the high pressure turbine of a bypass two-spool airplane turbojet, its operating temperature lies in the range 400° C. to 700° C. - The present invention thus relates to adopting said multilayer structure in which the (isotropic or anisotropic) elasticity characteristics of the second material are better than the (isotropic or anisotropic) elasticity characteristics of the first and third materials in the desired operating temperature range.
- In an embodiment, said first and third materials are the same or different metal alloys or organic matrix composite materials, while said second material is non-metallic. For example, and in non-exhaustive manner, the second material may be made of rubber, of silicone, of polyimide, of glass, or of epoxy resin.
- The multilayer structure of the shim of the invention has the following effects:
-
- uniformly distributing contact pressures by accommodation of the shim as a result of the elasticity of the second layer;
- on a change in speed of rotation, limiting relative movements between parts due to centrifugal forces by virtue of “static” shear in the second layer; and
- damping any dynamic movements of the blade by “dynamic” shear of the second layer.
- A particular consequence of these effects is to prevent or limit wear phenomena in the bearing surfaces, thereby increasing the lifetimes of blade roots and of disks.
- These effects are reinforced when the second material presents viscoelastic behavior in the operating temperature range of the shim, more particularly for the purpose of damping any dynamic movements of the blade.
- The invention also provides a turbomachine rotor assembly comprising: a rotor disk presenting slots in its outer periphery; blades fastened via their roots in said slots; and shims according to the invention, each branch of each shim being disposed between the bearing surface of a blade root and the corresponding bearing surface of the disk.
- Finally, the invention also provides a turbomachine including such a rotor assembly.
- The invention and its advantages can be better understood on reading the following detailed description. The description refers to the accompanying figures, in which:
-
FIG. 1 is a fragmentary exploded and diagrammatic view of a turbomachine rotor assembly comprising a rotor disk, an example of shim of the invention, and a blade root; -
FIG. 2 is a radial section view on plane II-II showing theFIG. 1 assembly once it has been assembled; -
FIG. 3 is a section view analogous to that ofFIG. 2 , showing another example of shim of the invention; and -
FIG. 4 is a section view analogous to that ofFIG. 2 , showing another example of shim of the invention, placed between two adjacent slots. -
FIGS. 1 and 2 show: arotor disk 2 having numerous grooves or “slots” 4 in its periphery that define housings, each suitable for receiving theroot 16 of ablade 14, theroot 16 being surrounded by ashim 20. Theblade root 16 and thefan disk 2 are made out of titanium alloy, for example. - It should be observed that assemblies also exist (not shown) that have a spacer placed between the
blade root 16 and the bottom of theslot 4. - When the
disk 2 is set into rotation, theblades 14 are subjected to centrifugal forces, and thebearing surfaces 16A on theblade root 16 become pressed against bearingsurfaces 22A of thedisk 2. In the example shown, thesurfaces 16A constitute the flanks of theblade root 16, while thesurfaces 22A constitute the bottom faces of the lip-shaped portions 22 of the disk that extend on either side of the outer opening of eachslot 4. - The
shim 20 comprises twoside branches 20A for coming against thebearing surfaces 16A of theblade root 16, and abase part 20B, here a base plate, interconnecting the branches and extending under theblade root 16. Theshim 20 constitutes a wear piece and its main function is to limit wear of theblade root 16 and of thefan disk 2. - In the example of
FIG. 2 , theshim 20 presents a multilayer structure in itsbranches 20A and itsbase part 20B, which structure comprises threelayers blade root 16 towards the disk 2: afirst layer 31 of a first material; asecond layer 32 of a second material; and athird layer 33 of a third material. In this example, the third material is identical to the first material, so that they present the same first Young's modulus. In accordance with the invention, at any operating temperature T of the shim, the first Young's modulus has a corresponding value E, and at said temperature T, said second material presents a second Young's modulus with a value lying in the range E/20 to E/5. - It should be observed that the
shim 20 must present a certain amount of stiffness in order to perform its mechanical function and its anti-wear function, such that the value of E is preferably greater than or equal to 110,000 megapascals (MPa) for metal shim (e.g. 210,000 MPa for shim made of a nickel-based superalloy, of the type sold under the name “Inconel”), and greater than or equal to 70,000 MPa for shim made of organic matrix composite material. - So far as the choice of materials is concerned, it naturally depends on the operating temperature of the shim.
- When the rotor assembly belongs to the fan or the low pressure compressor of a bypass two-spool airplane turbojet, it is subjected to operating temperatures lying in the
range 20° C. to 150° C. Under such circumstances, and by way of example, it is possible for the first material to be selected as a Ni-based superalloy with more than 15% by weight Fe and Cr, such as the superalloy sold under the name “Inconel 718”; while the second material can be rubber (natural or synthetic). In these circumstances, it is also possible for the first material to be a composite material using an epoxy resin matrix with reinforcing fibers, e.g. made of carbon; the second material could then be an epoxy resin on its own (with the difference in Young's modulus between the first and second materials being associated with the absence of fibers). - When the assembly belongs to the high pressure compressor of a bypass two-spool airplane turbojet, it is subjected to operating temperatures lying in the range 150° C. to 500° C. Under such circumstances, and by way of example, it is possible to select for the first material a Ni-based superalloy having more than 15% by weight of Fe and Cr, such as the superalloy sold under the name “Inconel 718”; the second material could be a silicone or polyimide.
- When the assembly belongs to the high pressure turbine of a bypass two-spool airplane turbojet, it is subjected to operating temperatures lying in the range 400° C. to 700° C. Under such circumstances, and by way of example, it is possible for the first material to be selected as an Ni-based superalloy with more than 15% by weight Fe and Cr, such as the superalloy sold under the name “Inconel 718”; the second material may be glass (which in this operating temperature range presents viscoelastic behavior).
- In general, it should be observed that said
layers -
- by natural adhesion when polymerizing the second layer 32 (or when vulcanizing it if is made of rubber);
- by adhesive;
- by welding the
layers - by brazing the
layers - by crimping; or
- by combining the above techniques (e.g. natural adhesion and crimping).
- Said layers may be integral with one another to form said multilayer structure, and the fastening that is obtained must naturally be sufficiently secure to prevent the structure becoming delaminated in operation and to prevent the
layer 32 from creeping. -
FIG. 3 is a section view analogous to that ofFIG. 2 showing another element of ashim 120 of the invention. Elements or element portions that are analogous betweenFIGS. 2 and 3 are identified by the same reference numerals plus 100. - The example of
FIG. 3 differs from that ofFIG. 2 in that thebase part 120B of theshim 120 is formed by the first andsecond layers branches 120A of the shim present a multilayer structure made up of the first, second, andthird layers base part 120B of the shim could also be formed solely by thethird layer 133, or indeed solely by thefirst layer 131. -
FIG. 4 is a section view analogous to that ofFIG. 2 showing another example of ashim 220 of the invention. Elements or element portions analogous betweenFIGS. 2 and 4 are identified with the same numerical references plus 200. - The example of
FIG. 4 differs from that ofFIG. 2 in that thebase part 220B of theshim 220 extends over the outer periphery of therotor disk 202 between twoadjacent slots 204, with eachbranch 220A of the shim penetrating into aslot 204 and being housed between thebearing surface 216A of theblade root 216 and the correspondingbearing surface 222A of thedisk 202. - The
shim 220 presents a multilayer structure analogous to that of theshim 20 inFIG. 2 , having threelayers
Claims (9)
1. A shim for a turbomachine blade, the shim comprising two branches for coming against bearing surfaces of the blade rotor, and a base part interconnecting the branches, the shim presenting, at least in its branches, a multilayer structure having at least three layers that are fastened to one another and superposed in the following order: a first layer of a first material; a second layer of a second material; and a third layer of a third material that is optionally different from the first material, said first and third materials presenting respective first and third Young's moduluses of values E and E′ at any arbitrary operating temperature in the operating temperature range of the shim, and said second material presenting a second Young's modulus of value lying in the range E/20 to E/5 and in the range E′/20 to E′/5 at said operating temperature.
2. A shim according to claim 1 , in which said first and third materials are identical.
3. A shim according to claim 1 , in which said first and third materials are metal alloys or organic matrix composite materials, while the second material is non-metallic.
4. A shim according to claims 1 , in which said second material presents viscoelastic behavior in the operating temperature range of the shim.
5. A shim according to claim 1 , in which said first, second, and third layers also extend in the base part of the shim.
6. A turbomachine rotor assembly comprising: a rotor disk presenting slots in its outer periphery; blades fastened by their roots in said slots; and shims according to any preceding claim, each branch of each shim being disposed between the bearing surface of a blade root and the corresponding bearing surface of the disk.
7. A turbomachine rotor assembly according to claim 6 , in which the base part of each shim extends under each blade root.
8. A turbomachine rotor assembly according to claim 6 , in which the base part of each shim extends over the outer periphery of the disk, between two adjacent slots.
9. A turbomachine comprising a rotor assembly according to claim 6 .
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0756466A FR2918702B1 (en) | 2007-07-13 | 2007-07-13 | CLINKING FOR TURBOMACHINE BLADE |
FR0756466 | 2007-07-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090060745A1 true US20090060745A1 (en) | 2009-03-05 |
Family
ID=39166321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/171,736 Abandoned US20090060745A1 (en) | 2007-07-13 | 2008-07-11 | Shim for a turbomachine blade |
Country Status (10)
Country | Link |
---|---|
US (1) | US20090060745A1 (en) |
EP (1) | EP2014873B1 (en) |
JP (1) | JP2009019629A (en) |
CN (1) | CN101344015A (en) |
CA (1) | CA2636922A1 (en) |
DE (1) | DE602008002486D1 (en) |
ES (1) | ES2352583T3 (en) |
FR (1) | FR2918702B1 (en) |
RU (1) | RU2472945C2 (en) |
UA (1) | UA96589C2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP2014873B1 (en) | 2010-09-15 |
RU2008128378A (en) | 2010-01-20 |
JP2009019629A (en) | 2009-01-29 |
FR2918702A1 (en) | 2009-01-16 |
ES2352583T3 (en) | 2011-02-21 |
UA96589C2 (en) | 2011-11-25 |
RU2472945C2 (en) | 2013-01-20 |
CN101344015A (en) | 2009-01-14 |
EP2014873A1 (en) | 2009-01-14 |
CA2636922A1 (en) | 2009-01-13 |
FR2918702B1 (en) | 2009-10-16 |
DE602008002486D1 (en) | 2010-10-28 |
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Owner name: SNECMA, FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DOUGUET, CHARLES;JACQ, CHRISTOPHE;LOMBARD, JEAN-PIERRE;REEL/FRAME:021231/0960 Effective date: 20080619 |
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