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Horizontal axle windmill and method for making wind-powered unit vane

A technology of wind turbines and horizontal axes, which is applied in the direction of wind turbines, wind power generation, wind turbines, etc. in the same direction as the wind, and can solve the problems of reducing the sweeping area of ​​the wind rotor, increasing the impact, and reducing the safety of the blades, etc.

Active Publication Date: 2011-05-18
中科国通检测认证(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Figure 4 shows the position change of the top of the blade. Due to the bending and torsional deformation, the top of the blade changes from position 4 to position 5. This bending and torsional deformation not only reduces the sweeping area of ​​the wind rotor, but also makes the The blade bends toward the tower, the impact of the tower shadow on the blade increases, and the torsional deformation changes the angle of attack of the incoming flow, and the blade deviates from the design working condition, resulting in a decrease in the aerodynamic performance of the blade and the energy absorption rate of the wind wheel
[0005] At the same time, the aerodynamic load and inertial force that the high-power unit bears is very large, which will lead to high stress on the blade root and reduce the safety of the blade

Method used

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  • Horizontal axle windmill and method for making wind-powered unit vane
  • Horizontal axle windmill and method for making wind-powered unit vane
  • Horizontal axle windmill and method for making wind-powered unit vane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: A wind turbine blade 3 with a length of 37m. In the design target, the root shape of the blade 3 is shown as A in Fig. 11, α is the installation angle of the blade root, and the top shape is shown in B in Fig. 11, β It is the installation angle of the top of the blade. When the wind wheel is running, the line connecting the centroid of each airfoil in the radial direction is a straight line and is completely in the radial direction. In the radial direction, 7 is the line connecting the centroid of each airfoil in the radial direction, and the installation angle of each section is at the design position. Considering the influence of the stiffness, aerodynamic load, inertial force and prestress of the blade 3 on the deformation, the connection line of the airfoil centers of the blade 3 (8 in Figure 12) is inclined forward about 5 degrees from the root to the top. The top installation angle β torsion angle increases by about 5 degrees, linearly changing from root...

Embodiment 2

[0046] Example 2: A wind turbine blade 3 with a length of 80m. In the design target, the difference between the root installation angle and the top installation angle of the blade 3 is -45 degrees. When the wind turbine is running, the connection between the center of each airfoil is straight and It is completely radial and the installation angle is in the design position. Considering the stiffness, aerodynamic load and inertial force of the blade 3, the connecting line of the center of each airfoil of the blade bends forward from the root to the top. The bending law is:

[0047] l = a ( y - y h y t - y h ) 2 ,

[0048] Among them: y is the radial coordinate of blade 3, a is a coefficient calculated according to the material characteristics of blade 3 and the shape of blade 3, y h Is the radial coordinate of the root of blade 3, y t Is the radial coordinate of the top of blade 3. The torsion angle distribution law of blade 3 is:

...

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PUM

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Abstract

Disclosed are a horizontal axis windmill and a manufacturing method for the vane of the wind turbines. The windmill comprises a tower and a wind wheel hub which is provided with vanes, wherein the vanes have structures for designing bending and torsional deforms in advance and structures for designing the prestress at the root of the vane in advance. The method is that the connection line of eachsection center of the vane is bent or inclined forward from the root to the top, so the vane can keep at straight status from root to top when the windmill is in running; the torsional angle of the aerofoil profile on each section of the vane is designed along the radial direction, the torsional deformation of the vane can be obtained according to the pneumatic load distribution of the vane, and the reverse torsional deform angle of the aerofoil profile on each section is designed in advance to make the torsional angle when the vane is running consistent to the designed geometry torsional angle of the vane; and the root of the vane has stress. When the vanes of the windmill are working, the vanes are basically at radial direction, the inflow flush angle and designed working condition of all the sections are basically consistent, the high efficiency use of wind energy is realized, the root stress of the vane is reduced, and the safety of the vane is improved.

Description

Technical field: [0001] The invention relates to a wind power generation device, in particular to a method for preparing a horizontal-axis windmill blade of a wind power generation long blade using pre-bending, pre-twisting and pre-stressing. Background technique [0002] Wind energy is the fastest-growing clean energy among renewable energy sources, and it is also the most promising power generation method for large-scale development and commercial development. In the 10 years from 1993 to 2003, the annual growth rate of world wind power reached 29.7%. By the end of 2003, the global installed capacity of wind power reached 40.3 million kilowatts, and wind power generation accounted for 0.5% of the world's total electricity. The total installed capacity in Europe is 28.71 million kilowatts, accounting for 73% of the world's installed wind power capacity. In 2003, the cumulative installed capacity of wind power in Germany reached 14.61 million kilowatts, accounting for more than...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D1/06
CPCY02E10/721Y02E10/72Y02P70/50
Inventor 黄典贵徐建中赵晓路徐宇石可重王仲夏
Owner 中科国通检测认证(天津)有限公司