Energy concentrating type horizontal axis wind turbine used for improving wind energy utilization rate and application method thereof

Abstract

The invention relates to an energy concentrating type horizontal axis wind turbine used for improving wind energy utilization rate and a application method thereof. The wind turbine comprises an energy concentrating hood, a wind turbine impeller, an axial position adjustment mechanism of the impeller, a temperature sensor, a wind speed sensor and a boundary layer probe. The application method comprises the following steps that the energy concentrating hood is moved into a wind tunnel, a calibration experiment is carried out, measurement sections are selected; the thickness data of the boundarylayer at each section and the temperature data at the moment under a set wind speed are measured; the wind speed and temperature are adjusted, the thickness data of the boundary layer is remeasured;under the same wind speed and temperature, the data are summarized to obtain a regular curve of the thickness of the boundary layer changing with the position of the measurement section; under the same measurement section and different wind speed, the data are summarized to obtain the regular curve of the thickness of the boundary layer changing with the wind speed; under the same wind speed and different temperature, the data are summarized to obtain the regular curve of the thickness of the boundary layer changing with the air flow temperature; a database is established; and the wind turbineis moved into a working area, the measured data are compared with the database, the position of the maximum section of the flow rate is determined, and the impeller is moved to the maximum section ofthe flow rate.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to an energy-gathering horizontal-axis wind turbine for improving the utilization rate of wind energy and a use method thereof. Background technique [0002] At present, most of the large-scale wind turbines connected to the grid are horizontal-axis wind turbines. Horizontal-axis wind turbines generally rely on the lift of the blades to perform work on the tangential component of the rotation profile, commonly known as lift-type wind turbines. [0003] Although the lift-type wind turbine has the advantages of high tip speed ratio and high wind energy utilization rate, it also has the disadvantage of weak start-up performance. The start-up wind speed of general lift-type wind turbines is above 5m / s, and individual lift-type wind turbines The start-up wind speed is even as high as 7m / s, which will reduce the power generation and power generation range of the ...

AI Technical Summary

Problems solved by technology

[0007] Therefore, when the airflow flows through the inner surface of the energy-gathering hood, a boundary layer will be formed on the inner surface of the energy-gathering hood, and the boundary layer will change with the speed and temperature of the airflow. In this case, the position of the maximum cross-section of the airflow velocity in the energy-collecting hood will also change accordingly. Since the position of the wind turbine impeller cannot be changed, the wind turbine impeller cannot always be located at the maximum cross-section of the airflow velocity, which eventually leads to the traditional Energy-concentrating horizontal axis wind turbines cannot meet the maximum requirements of wind energy utilization

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