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Fiber winding prestress turbine rotor

A turbine rotor and prestressing technology, which is applied to the support components of blades, climate sustainability, engine components, etc., can solve the problems of unable to meet the high temperature working environment of turbine rotors and the decrease of steel wire strength, so as to improve fatigue life or operating temperature , the effect of reducing work stress

Active Publication Date: 2012-04-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the strength of the steel wire will drop sharply at high temperature, which cannot meet the high temperature working environment of the turbine rotor.

Method used

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  • Fiber winding prestress turbine rotor
  • Fiber winding prestress turbine rotor
  • Fiber winding prestress turbine rotor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The specific structure of a prestressed fiber wound turbine rotor of the present invention is as follows: figure 1 , figure 2 and image 3 shown. The turbine rotor consists of a turbine disc 1 and a set of blades 2, which are assembled with a light-weight high-temperature-resistant material (such as titanium-aluminum intermetallic compound or carbon / carbon composite material) outside the blade shroud 7 with a gap of 0.001mm to 0.01mm. The ring groove 3 is made, and the high-temperature high-strength fiber is wound in the ring groove 3 layer by layer with a tensile stress of 0-10.0GPa; when the preset number of turns and layers are wound, the prestressed fiber winding layer 5 The thickness can reach 0.5mm ~ 100mm. After the preset prestress is generated on the turbine disk 1 and blade 2, the winding layer is covered with a sealing cover plate 4, and a closed structure is formed by connecting the seam 6 and the ring groove 3 to isolate the prestress. The stress windin...

Embodiment 2

[0039] The specific structure of a prestressed fiber wound turbine rotor of the present invention is as follows: Figure 4 and Figure 5 shown. The turbine rotor is composed of a turbine disk 1 and a set of blades 2. The winding groove 8 is directly processed on the blade crown 7 of the blade, and the high-temperature and high-strength fibers are wound on the winding groove layer by layer with a tensile stress of 0-10.0GPa. 8; when the preset number of turns and layers are wound, the thickness of the prestressed fiber winding layer 5 can reach 0.5 mm to 100 mm. After the preset prestress is generated on the turbine disk 1 and blade 2, seal the The plate 4 covers the wrapping layer and forms a closed structure through the connection of the seam 6 and the wrapping groove 8 to isolate the prestressed wrapping layer 5 from contact with the external airflow.

Embodiment 3

[0041] The specific structure of a prestressed fiber wound turbine rotor of the present invention is as follows: Figure 6 and Figure 7 shown. The turbine rotor is composed of a turbine disk 1 and a set of blades 2. The winding groove 8 processed on the blade crown 7 of the blade is made of fibers (silicon carbide fibers) with strong high-temperature oxidation resistance or reliable oxidation resistance on the surface. Coated (such as carbon fiber surface prepared with silicon carbide coating or aluminum oxide coating) fibers are wound in the winding groove 8 layer by layer with a tensile stress of 0-10.0 GPa. After the preset number of turns and layers are wound, the thickness of the prestressed fiber winding layer 5 can reach 0.5 mm to 100 mm, and a preset prestress is generated on the turbine disk 1 and the blade 2 .

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Abstract

The invention provides a fiber winding prestress turbine rotor and belongs to structural designs of turbine engines and gas turbines as well as component antifatigue designs. A light high-strength fiber with excellent high temperature performance is wound in a circular groove outside a rotor head of a turbine with a designed tensile force and then closed and sealed; a prestress winding layer applies certain initial pretightening forces to a turbine disk and a blade, and a prestress fiber with a smaller thermal expansion coefficient can generate a thermal pretightening force at high temperature; the pretightening forces of two parts are superposed, so that the working stress amplitude and average value of the turbine disk and the blade can be greatly reduced, thus achieving the purpose of improving the antifatigue life and working temperature of the turbine rotor; and the prestress winding layer also can be used for retarding the expansion speed of cracks when the turbine rotor is invalid, thereby achieving an anti-explosion effect and a safety protection effect of preventing fragments from flying out.

Description

technical field [0001] The invention relates to a turbine rotor of a gas turbine, in particular to a prestressed wound turbine rotor of a gas turbine. Background technique [0002] Turbine rotors are the key working parts of aerospace engines and gas turbines. Under the harsh working conditions of high temperature and high speed, it is required to work stably for a long time. Centrifugal force generated by high speed, thermal stress, aerodynamic force of gas or steam, vibration load and other complex loads act comprehensively on the turbine disk and blades of the turbine rotor, forming a stress state dominated by tensile stress. As a result, turbine materials must have high strength and excellent fatigue resistance at high temperatures. Once the blades or turbine discs of the turbine rotor fail and fail, the centrifugal force of high-speed rotation causes the debris to fly out at high speed, causing serious damage to other parts of the engine. [0003] In order to improve...

Claims

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Application Information

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IPC IPC(8): F01D5/02F01D5/28
CPCF01D5/00F01D5/282F01D5/14F01D5/225F05D2300/603F01D5/288Y02T50/672Y02T50/673F01D5/34Y02T50/60F01D5/03
Inventor 林峰张人佶巩前明张磊张婷袁宵闫文涛
Owner TSINGHUA UNIV
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