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

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 each section 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 generating device, in particular to a method for preparing horizontal axis windmill blades with long blades for wind power generation which are jointly formed by 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 commercialization. During the 10 years from 1993 to 2003, the annual growth rate of wind power generation in the world 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. Among them, 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 Germa...

AI Technical Summary

Problems solved by technology

Figure 4 The position change of the top of the blade is given. Due to the bending and twisting deformation, the top of the blade changes from position 4 to position 5. This bending and twisting deformation not only reduces the sweeping area of ​​the wind rotor, but also makes the blade move towards The direction of the tower is bent, the influence of the tower shadow on the blade is increased, 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 rotor

[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

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