Spiral vertical axis wind turbine blade for wind power generation and machining method

Abstract

The invention discloses a spiral vertical axis wind turbine blade for wind power generation and a machining method. The blade has spiral structure, the rotating angle is 180 degrees, and the ratio of the height h to the diameter d is 1.2; and the blade material has aluminum alloy solid structure, the horizontal section shape of the blade is as same or similar as that of an American standard aviation wing type NACA4418, and through holes are respectively machined at two ends of the blade and used for connecting a wind turbine fixed disc. According to the blade and the method, the defects of energy pulsation and starting dead angle of a vertical axis wind turbine are overcome, the problems that the vertical axis wind turbine is not suitable for cities with insufficient wind resources and regions with dense population and complex wind condition are solved, and the problems of energy pulsation and starting dead angle of the vertical axis wind turbine are solved; and the problem of machining the complex curved surface of the spiral blade is solved, the utilization rate of Chinese wind energy is greatly promoted, and the development of the wind power industry is promoted.

Description

technical field [0001] The invention relates to a processing method of a spiral vertical axis wind turbine blade for wind power generation. Background technique [0002] Vertical axis wind power generators are mainly divided into four types: Savonius type, Darrieus type, H type and turbine type. The Savonius type belongs to the drag type wind turbine, which has a large starting torque and has a good ability to capture wind energy at low wind speeds, but the wind energy utilization rate is low, and because of the low wind energy conversion efficiency, it is rarely used; the Darrieus type belongs to the lift type wind turbine, and the efficiency is low. Higher but poor self-starting ability, and blade processing is very complicated; H type is a model developed on the basis of Darrieus wind turbine, with good self-starting ability and simple structure, and is currently the most used model of vertical axis wind turbines. However, it requires a high start-up wind speed. In resid...

AI Technical Summary

Problems solved by technology

The Savonius type belongs to the drag type wind turbine, which has a large starting torque and has a good ability to capture wind energy at low wind speeds, but the wind energy utilization rate is low, and because of the low wind energy conversion efficiency, it is rarely used; the Darrieus type belongs to the lift type wind turbine, and the efficiency is low. Higher but poor self-starting ability, and blade processing is very complicated; H type is a model developed on the basis of Darrieus wind turbine, with good self-starting ability and simple structure, and is currently the most used model of vertical axis wind turbines. However, it requires a high start-up wind speed. In residential areas, due to low wind speed and complex wind conditions, it is often in a shutdown state or an unstable working state (such as energy pulsation and start-up dead angle, etc.); the turbine type has good adaptability to environments with low air density.

Therefore, for villages and towns with less abundant wind resources and urban areas with high-rise buildings and complex wind conditions, the above-mentioned type of vertical axis wind turbine is not suitable, and structural improvement and performance optimization are required

The utility model patent 201020112299.7 combined the proper deformation of the S-shaped blade with the helical blade, but failed to explain the specific structure of the helical blade, and the utilization of wind energy is unknown

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