A horizontal axis wind turbine

Abstract

The invention discloses a horizontal-axis wind turbine and belongs to the field of wind power generation equipment. The horizontal-axis wind turbine comprises an electric generator, a gearbox and a wind machine; the wind machine comprises a plurality of blades and a rotary shaft installed in the horizontal direction, and the blades are installed on the rotary shaft equidistantly in the circumferential direction; each blade is provided with at least one cavity, and an opening of each cavity is covered with a flexible film. According to the horizontal-axis wind turbine, the local flexible blades are adopted, so that the lift-to-drag ratio of the blades of the wind machine is increased, the output torque of the wind machine is increased, the effective working condition range of the wind machine is expanded, effective utilization of wind energy at a low wind speed can be realized, and the horizontal-axis wind turbine is simple in structure and convenient to control.

Description

technical field [0001] The invention belongs to the field of wind power generation equipment, and in particular relates to a horizontal axis wind power generator. Background technique [0002] Wind energy is currently the most promising new type of energy. It is an inexhaustible energy source and a clean, pollution-free, renewable green energy source. my country has a vast territory, long coastline and abundant wind resources. The national average wind energy density is about 100W / m 2 , the total amount of wind energy is 3226GW, of which the total amount of onshore wind energy available for development and utilization is about 253GW, plus offshore wind resources, my country's usable wind resources are nearly 1000GW. In my country's southeast coast and nearby islands, Inner Mongolia and the Hexi Corridor, as well as in parts of my country's northeast, northwest, North China, Hainan and west Qinghai-Tibet Plateau, the annual average wind speed is above 3m / s for nearly 4000h,...

AI Technical Summary

Problems solved by technology

[0003] However, on the one hand, due to the uncertainty and variability of wind resources, in the actual operation of wind turbines, the wind speed may change continuously, and the wind turbine cannot work at the optimal working point, especially when the wind speed becomes low. When the flow angle of attack becomes smaller, flow separation is prone to occur on the blades of the wind turbine, the lift force on the blades becomes smaller and the resistance increases, and the maximum torque cannot be obtained, so it can only operate at low load, or the wind speed is too low to cause the wind turbine to fail to start and run. Resulting in low annual operating hours of wind power equipment

Although some wind turbines are equipped with blade angle adjustment devices, they are expensive, and frequent adjustments are complex and costly

On the other hand, the current rated wind speed of wind turbines is generally 12m / s, and the minimum design wind speed is about 5m / s. When the wind speed is lower than 5m / s, the wind turbine cannot work normally, and the wind power generation equipment cannot effectively output power, resulting in low wind speed. waste of resources

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