A forked blade root double-corrugation damping device, method and rotor with creep compensation

Abstract

The application discloses a fork-type blade root double-corrugation damping device and method and a rotor, and relates to the technical field of steam turbine blade vibration suppression. The device comprises a blade, a disc, upper corrugation friction damping sheets, lower corrugation friction damping sheets, fixing bolts and a high-temperature alloy disc spring set. Corrugation damping grooves are formed on the blade and the disc respectively, and the two corrugation friction damping sheets are placed between the two grooves and are in mesh with each other. The fixing bolts are used for connecting the blade and the disc, and the high-temperature alloy disc spring set is sleeved on the bolts and is used for compensating high-temperature creep deformation of the bolts. Through the elastic compensation of the disc spring set and the multiple friction energy dissipation of the double-corrugation structure, the device can still maintain stable pre-tightening force and damping performance after long-time high-temperature operation, the safety of unit operation is significantly improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application belongs to the field of turbine blade vibration suppression technology, and specifically relates to a creep compensation fork-shaped blade root double corrugated damping device, method and rotor. Background Technology

[0002] Forked blade roots are the standard connection form for high-pressure and medium-pressure stage blades in steam turbines, offering advantages such as high load-bearing capacity, uniform load distribution, and the ability to replace individual blades. These blade roots typically connect the blades to the turbine disk using 2 to 4 fixing bolts. The bolt preload is a key factor in ensuring connection reliability and effective dry friction damping vibration reduction.

[0003] Under high temperature and high pressure conditions, the damping device of the forked blade root faces severe technical challenges. The operating temperature of the high-pressure cylinder of an ultra-supercritical steam turbine can reach above 550℃. Under high temperature and continuous preload, the bolts will undergo significant creep deformation, leading to a gradual decrease in preload. Operational experience shows that after 10,000 hours of operation at 550℃, the bolt preload will decrease by 30% to 40%. The vibration reduction effect of dry friction damping is proportional to the normal pressure on the contact surface. A 30% decrease in bolt preload will lead to a more than 30% decrease in damping force, which may cause the blade vibration amplitude to exceed the safety limit and trigger a blade breakage accident.

[0004] To ensure damping performance, traditional solutions require downtime for inspection and bolt retightening every 6 to 12 months, with each downtime incurring losses of up to several million yuan. Furthermore, frequent disassembly and assembly accelerates thread wear. The industry has attempted to use disc springs to compensate for preload loss, but ordinary disc springs are prone to stress relaxation and fatigue failure at high temperatures, and their compensation effect is essentially lost after 5000 hours of operation.

[0005] Therefore, how to compensate for the high-temperature creep deformation of bolts in a long-term and stable manner, and maintain stable preload and damping performance, is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] The purpose of this application is to provide a creep-compensated fork-shaped blade root double-corrugated damping device, method, and rotor. This addresses the technical problems in the prior art where high-temperature creep of bolts leads to preload attenuation and decreased damping performance, and existing compensation schemes cannot operate stably for extended periods.

[0007] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, a creep-compensated fork-shaped blade root double-corrugated damping device is provided, comprising: The blade has an upper corrugated damping groove on the bottom plane of its blade root; The wheel has a lower corrugated damping groove on the top side near the center of rotation; The upper corrugated friction damping plate and the lower corrugated friction damping plate both have a continuous tooth structure and are fixedly disposed in the upper corrugated damping groove and the lower corrugated damping groove, respectively, and the two mesh with each other; A fixing bolt is passed through the blade and the wheel in sequence to fix them together. A high-temperature alloy disc spring assembly is sleeved on the fixing bolt and is used to release elastic potential energy to compensate for the deformation of the bolt when it undergoes high-temperature creep.

[0008] In one possible implementation, the upper and lower corrugated friction damping plates have triangular teeth with a tooth apex angle of 85° to 95°, a tooth pitch of 3.5 to 4.5 mm, and a tooth height of 1.8 to 2.2 mm.

[0009] In one possible implementation, the upper corrugated friction damping sheet is made of tin bronze with a hardness of HB180~200; the lower corrugated friction damping sheet is made of aluminum bronze with a hardness of HB160~180.

[0010] In one possible implementation, the total compression of the high-temperature alloy disc spring assembly is 3.5~4.5mm, the compensable bolt creep deformation is 0.8~1.2mm, and the corresponding preload loss compensation range is 25%~35%.

[0011] In one possible implementation, the surface roughness of the upper and lower corrugated damping grooves is Ra1.6~Ra3.2μm, and the surfaces are phosphated.

[0012] In one possible implementation, the high-temperature alloy disc spring assembly is composed of multiple GH4169 high-temperature alloy disc springs coupled together.

[0013] In one possible implementation, the fixing bolt is made of GH4145 high-temperature alloy material, and its surface is coated with a high-temperature lubricating coating of molybdenum disulfide.

[0014] Secondly, this application also provides a method for damping and creep compensation of the forked blade root based on the above-mentioned device, comprising: Preload application steps: By tightening the fixing bolts, the high-temperature alloy disc spring assembly sleeved on it is compressed, allowing it to store elastic potential energy and providing initial preload for the connection between the blade and the wheel. Creep compensation step: When the fixing bolt undergoes creep deformation during high-temperature operation, the compressed high-temperature alloy disc spring assembly automatically releases its elastic potential energy and elongates, dynamically compensating for the creep of the fixing bolt, thereby maintaining the stability of the initial preload. Vibration energy dissipation steps: When the blade vibrates, relative sliding occurs between the meshing upper corrugated friction damping plate and the lower corrugated friction damping plate, as well as between the two and the upper corrugated damping groove and the lower corrugated damping groove respectively. Vibration energy is dissipated through multiple friction interfaces, and the normal pressure of each friction interface is maintained stable by the initial preload.

[0015] Thirdly, this application also provides a steam turbine rotor, including a disk and blades mounted on the disk, wherein the blades are connected to the disk via any of the aforementioned devices.

[0016] Compared with the prior art, this application has the following beneficial effects: This application provides a creep-compensated fork-shaped blade root double-corrugated damping device. By setting up intermeshing upper and lower corrugated friction damping plates and a high-temperature alloy disc spring assembly sleeved on the fixing bolt, it realizes the synergistic effect of double-corrugated multi-friction energy dissipation and creep compensation. During high-temperature operation, the disc spring assembly automatically compensates for the creep deformation of the bolt and maintains a stable preload, thereby ensuring that the normal pressure of the multi-friction interface is constant, so that the damping performance does not decay over a long period of time, and significantly improving the safety and reliability of the unit operation.

[0017] In one possible implementation, by defining the tooth profile of the upper and lower corrugated friction damping plates as triangular teeth with a tooth tip angle of 85°~95°, a tooth pitch of 3.5~4.5mm, and a tooth height of 1.8~2.2mm, the contact area of ​​the two damping plates is maximized, while ensuring the smoothness of tooth meshing and self-positioning capability. This improves energy dissipation efficiency and avoids stress concentration or slippage caused by excessively steep or gentle tooth profiles.

[0018] In one possible implementation, by using tin bronze for the upper corrugated friction damping sheet and aluminum bronze for the lower corrugated friction damping sheet, the dissimilar materials are combined with a moderate difference in hardness. This ensures sufficient wear resistance during long-term reciprocating friction and effectively avoids cold welding or seizing failures caused by contact between similar materials, thus significantly extending the service life of the damping sheet.

[0019] In one possible implementation, by limiting the total compression of the high-temperature alloy disc spring assembly to 3.5~4.5mm, compensating for bolt creep deformation of 0.8~1.2mm, and corresponding to a preload loss compensation range of 25%~35%, quantitative design parameters matching the actual operating conditions of ultra-supercritical steam turbines are given. This ensures that the disc spring assembly is always in the elastic working range during the unit overhaul cycle, which can fully compensate for bolt creep without causing plastic deformation due to over-compression, thus achieving the optimal balance between compensation capability and reliability.

[0020] In one possible implementation, by limiting the surface roughness of the upper and lower corrugated damping grooves to Ra1.6~Ra3.2μm and subjecting them to phosphating treatment, the moderate roughness increases the friction coefficient between the damping sheet and the bottom of the groove, thereby improving the energy dissipation capacity; the phosphating treatment improves the wear resistance and corrosion resistance of the groove surface, ensuring that the designed friction characteristics are maintained for a long time in high temperature and high humidity environments.

[0021] In one possible implementation, the high-temperature alloy disc spring assembly is defined as being composed of multiple GH4169 high-temperature alloy disc springs in pairs. This utilizes the excellent stress relaxation and fatigue resistance of GH4169 below 650℃, and the multi-pair structure allows for flexible adjustment of the number of discs according to preload requirements. The failure of any single disc does not affect the overall function, thus improving the redundancy and reliability of the compensation system.

[0022] In one possible implementation, by limiting the fixing bolts to GH4145 high-temperature alloy and coating them with a molybdenum disulfide high-temperature lubricating coating, the extremely low creep rate of GH4145 at high temperatures fundamentally reduces the creep of the bolts themselves, forming a double protection with the disc spring assembly; the molybdenum disulfide coating ensures that the bolts will not seize during high-temperature disassembly and assembly, facilitating maintenance.

[0023] A method for damping and creep compensation of fork-shaped blade roots based on the above-mentioned device organically integrates three steps: preload application, creep compensation, and vibration energy dissipation. This forms a complete closed loop of initial preload, automatic compensation, and stable energy dissipation, enabling the device to adapt to the high-temperature creep behavior of bolts without external intervention and maintain the damping performance of the initial design for a long time, greatly reducing operation and maintenance costs and downtime losses.

[0024] A turbine rotor, by integrating the above-mentioned device into the connection structure between the rotor disk and the blades, ensures the long-term stability of the damping performance of each blade at the overall rotor level, thereby suppressing the vibration response of the entire stage of blades and improving the operational safety margin of the entire unit under high-temperature conditions. Attached Figure Description

[0025] Figure 1 An assembly diagram of the forked blade root double-corrugated damping device for creep compensation provided in this application; Figure 2 A schematic diagram of the meshing structure of the double-corrugated friction damper provided in this application; Figure 3 A schematic diagram of the blade provided in this application; Figure 4 A schematic diagram of the roulette wheel provided in this application; Figure 5 A schematic diagram of the disc spring assembly provided in this application.

[0026] The attached figures are labeled as follows: 1. Blade; 2. Upper corrugated friction damping plate; 3. Lower corrugated friction damping plate; 4. Wheel; 5. Fixing bolt; 6. High-temperature alloy disc spring assembly; 7. Upper corrugated damping groove; 8. Lower corrugated damping groove. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0028] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly defined. The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Example 1 This embodiment provides a creep-compensated fork-shaped blade root double-corrugated damping device, which is applied to the third stage blade of the high-pressure cylinder of a 600MW ultra-supercritical steam turbine. The operating temperature is 540℃ and the operating pressure is 16.7MPa.

[0034] like Figures 1 to 5 As shown, the device includes a blade 1, an upper corrugated friction damping plate 2, a lower corrugated friction damping plate 3, a wheel 4, two fixing bolts 5, and two high-temperature alloy disc spring assemblies 6.

[0035] Blade 1 is made of 2Cr12NiMo1W1V stainless steel, with a hardness of HB240 after quenching and tempering. An upper corrugated damping groove 7 is formed on the bottom plane of the blade root. The groove has continuous triangular teeth with a 90° apex angle, a tooth pitch of 4 mm, a tooth height of 2 mm, a surface roughness of Ra1.6 μm, and is phosphated. Two bolt holes are provided on the blade root.

[0036] The wheel 4 is made of 25Cr2Ni4MoV alloy steel, and its hardness is HB230 after quenching and tempering. A lower corrugated damping groove 8 is formed on the top of the wheel 4 near the center of rotation, and its tooth profile parameters are exactly the same as those of the upper corrugated damping groove 7. The wheel 4 has threaded holes corresponding to the blade bolt holes.

[0037] The upper corrugated friction damping plate 2 is made of QSn10-1 tin bronze, with a hardness of HB190 and a thickness of 1.5mm. The lower corrugated friction damping plate 3 is made of QAl9-4 aluminum bronze, with a hardness of HB170 and a thickness of 1.5mm. Both have a continuous triangular tooth structure and are fixedly placed in the upper corrugated damping groove 7 and the lower corrugated damping groove 8, respectively, and their teeth mesh with each other (see...). Figure 2 ).

[0038] The fixing bolts 5 are made of GH4145 high-temperature alloy material, which has a tensile strength of 1250MPa after solution treatment at 980℃ and aging at 730℃. The specifications are M20×1.5, the preload is 100kN, and the surface is coated with a high-temperature lubricating coating of molybdenum disulfide. The two fixing bolts 5 are respectively screwed into the threaded holes of the blade 1 and screwed into the threaded holes of the wheel 4 to fix the blade 1 to the wheel 4.

[0039] High-temperature alloy disc spring assembly 6 consists of 6 GH4169 high-temperature alloy disc springs joined together (see...) Figure 5 The total compression is 4mm, the compensable creep deformation is 1mm, and the corresponding preload loss compensation range is about 30%. Two high-temperature alloy disc spring assemblies 6 are respectively sleeved on two fixing bolts 5, located between the bolt head and the blade 1.

[0040] The working principle of this embodiment: When the fixing bolt 5 is tightened, the high-temperature alloy disc spring assembly 6 is compressed, storing elastic potential energy. When the fixing bolt 5 undergoes creep deformation at a high temperature of 540℃, the disc spring assembly 6 releases its elastic potential energy, automatically elongates, and dynamically compensates for the creep deformation of the bolt, thereby maintaining the stability of the bolt preload. When the blade 1 vibrates, relative sliding occurs between the meshing upper corrugated friction damping plate 2 and the lower corrugated friction damping plate 3, as well as between them and the upper corrugated damping groove 7 and the lower corrugated damping groove 8, respectively, forming multiple friction interfaces. This converts the vibration mechanical energy into frictional heat energy, which is then dissipated. Because the disc spring assembly 6 maintains a stable preload, the normal pressure of each friction interface remains constant over a long period, achieving long-term stability of the damping performance.

[0041] After testing, this embodiment operated continuously for 20,000 hours at 540℃, with a bolt preload loss of only 12%, a damping performance retention rate of over 85%, and blade vibration amplitude consistently kept within safe limits, without any seizing or abnormal wear.

[0042] Example 2: This embodiment provides a method for damping and creep compensation of the forked blade root based on the device described in Embodiment 1. The method includes the following steps: Preload application steps: During initial installation, tightening the fixing bolt 5 compresses the high-temperature alloy disc spring assembly 6 fitted onto it, allowing it to store elastic potential energy and providing an initial preload force (100kN in this embodiment) for the connection between the blade 1 and the wheel 4. This preload force acts simultaneously on the meshing surfaces of the upper corrugated friction damping plate 2 and the lower corrugated friction damping plate 3, as well as the contact surfaces of the two damping plates and their respective damping grooves, forming a stable positive pressure.

[0043] Creep compensation steps: When the steam turbine operates at a high temperature of 540℃ for an extended period, the fixing bolt 5 undergoes creep deformation (increased length, decreased preload). At this time, the compressed high-temperature alloy disc spring assembly 6 senses the decrease in preload, automatically releases its elastic potential energy and elongates, dynamically compensating for the creep of the fixing bolt 5, thereby maintaining the initial preload essentially unchanged. This compensation process is automatic, continuous, and passive, requiring no external intervention.

[0044] Vibration energy dissipation step: When blade 1 vibrates under airflow excitation, relative sliding occurs between the meshing upper corrugated friction damping plate 2 and the lower corrugated friction damping plate 3, as well as between the two and the upper corrugated damping groove 7 and the lower corrugated damping groove 8, respectively. The vibration mechanical energy is converted into frictional heat energy and dissipated through the triple friction interface. Because the creep compensation step maintains a stable preload, the normal pressure of each friction interface remains constant over a long period of time, ensuring the long-term stability of the damping performance.

[0045] The three steps mentioned above work together: the application of preload is the foundation, creep compensation is continuously and automatically executed throughout the entire life cycle, and vibration energy dissipation occurs in real time with blade vibration, together achieving the overall technical effect of "long-term stability of preload and continuous maintenance of damping performance".

[0046] Example 3: This embodiment provides a steam turbine rotor, specifically a high-pressure rotor for a 600MW ultra-supercritical steam turbine. The rotor includes a disk 4 and multiple blades 1 mounted circumferentially on the disk 4.

[0047] Each blade 1 is connected to the wheel 4 via the device described in Embodiment 1: the forked blade root of the blade 1 is fixed to the wheel 4 by two fixing bolts 5, and each fixing bolt 5 is fitted with a disc spring group 6 composed of 6 GH4169 high temperature alloy disc springs; between the bottom plane of the blade root of the blade 1 and the top of the wheel 4 near the rotation center, an upper corrugated friction damping plate 2 and a lower corrugated friction damping plate 3 are provided to mesh with each other.

[0048] After adopting this device, the high-pressure rotor can operate continuously for 20,000 hours at 540℃ and 16.7MPa without needing to stop for inspection or retightening of bolts. After shutdown testing, the preload of all bolts decreased by less than 15%, the vibration amplitude of the blades was below 80% of the safety threshold, and the rotor operated smoothly overall.

[0049] As an alternative implementation, when applied to the high-pressure cylinder of a 300MW ultra-supercritical steam turbine, the tooth profile parameters can be adjusted to a tooth tip angle of 85°, a tooth pitch of 3.5mm, a tooth height of 1.8mm, a total compression of 3.5mm for the disc spring assembly, and a compensation deformation of 0.8mm; when applied to the intermediate-pressure cylinder of a 1000MW ultra-supercritical steam turbine, the tooth profile parameters can be adjusted to a tooth tip angle of 95°, a tooth pitch of 4.5mm, a tooth height of 2.2mm, a total compression of 4.5mm for the disc spring assembly, and a compensation deformation of 1.2mm.

[0050] In addition to the embodiments described above, the technical solutions of this application can be modified in other reasonable ways according to specific working conditions. For example, the material hardness of the upper corrugated friction damping plate 2 and the lower corrugated friction damping plate 3 can be varied within the range defined in the claims; the number of disc springs in the high-temperature alloy disc spring assembly 6 can be adjusted according to the requirements of preload and compensation (e.g., 4, 6, or 8 discs in combination); the number of fixing bolts 5 can be 2, 3, or 4 depending on the blade size. These all fall within the protection scope of this application.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A creep-compensated forked-blade double-corrugation damper device, characterized by include: The blade (1) has an upper corrugated damping groove (7) on the bottom plane of the blade root; The wheel (4) has a lower corrugated damping groove (8) on the top side near the rotation center; The upper corrugated friction damping plate (2) and the lower corrugated friction damping plate (3) are both of continuous tooth structure and are fixedly disposed in the upper corrugated damping groove (7) and the lower corrugated damping groove (8) respectively, and the upper corrugated friction damping plate (2) and the lower corrugated friction damping plate (3) mesh with each other. A fixing bolt (5) is passed through the blade (1) and the wheel (4) in sequence to fix them together; A high-temperature alloy disc spring assembly (6) is sleeved on the fixing bolt (5) and is used to release elastic potential energy to compensate for its deformation when the bolt undergoes high-temperature creep.

2. The creep compensation fork-shaped blade root double-corrugated damping device according to claim 1, characterized in that, The upper corrugated friction damping plate (2) and the lower corrugated friction damping plate (3) have triangular teeth with a tooth apex angle of 85°~95°, a tooth pitch of 3.5~4.5mm, and a tooth height of 1.8~2.2mm.

3. The creep compensation for forked blade root double-corrugated damping device according to claim 1, characterized in that, The upper corrugated friction damping sheet (2) is made of tin bronze material with a hardness of HB180~200; The lower corrugated friction damping sheet (3) is made of aluminum bronze with a hardness of HB160~180.

4. The creep compensation for forked blade root double-corrugated damping device according to claim 1, characterized in that, The total compression of the high-temperature alloy disc spring assembly (6) is 3.5~4.5mm, the compensable bolt creep deformation is 0.8~1.2mm, and the corresponding preload loss compensation range is 25%~35%.

5. The creep compensation for forked blade root double-corrugated damping device according to claim 1, characterized in that, The surface roughness of the upper corrugated damping groove (7) and the lower corrugated damping groove (8) is Ra1.6~Ra3.2μm, and the surface is phosphated.

6. The creep-compensated fork-shaped blade root double-corrugated damping device according to claim 1 or 4, characterized in that, The high-temperature alloy disc spring assembly (6) is composed of multiple GH4169 high-temperature alloy disc springs joined together.

7. The creep compensation for forked blade root double-corrugated damping device according to claim 1, characterized in that, The fixing bolt (5) is made of GH4145 high-temperature alloy material, and its surface is coated with a high-temperature lubricating coating of molybdenum disulfide.

8. A method for damping and creep compensation of a forked blade root blade based on a forked blade root double-corrugated damping device according to any one of claims 1 to 7, characterized in that, include: Preload application steps: By tightening the fixing bolt (5), the high-temperature alloy disc spring assembly (6) sleeved on it is compressed, so that it stores elastic potential energy and provides initial preload for the connection between the blade (1) and the wheel (4); Creep compensation step: When the fixing bolt (5) undergoes creep deformation during high-temperature operation, the compressed high-temperature alloy disc spring assembly (6) automatically releases elastic potential energy and elongates, dynamically compensating for the creep of the fixing bolt (5), thereby maintaining the stability of the initial preload. Vibration energy dissipation steps: When the blade (1) vibrates, relative sliding occurs between the meshing upper corrugated friction damping plate (2) and the lower corrugated friction damping plate (3), as well as between the two and the upper corrugated damping groove (7) and the lower corrugated damping groove (8) respectively. Vibration energy is dissipated through multiple friction interfaces, and the positive pressure of each friction interface is maintained stable by the initial preload.

9. A steam turbine rotor, comprising a disk (4) and blades (1) mounted on the disk (4), characterized in that, The blade (1) is connected to the wheel (4) via a forked blade root double corrugated damping device with creep compensation as described in any one of claims 1 to 7.

10. The turbine rotor according to claim 9, characterized in that, The turbine rotor is a high-pressure rotor or a medium-pressure rotor of a 300MW to 1000MW ultra-supercritical turbine.

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