A flexible energy-gathering cover suitable for horizontal-axis wind turbines

Abstract

The invention relates to a flexible energy gathering cover suitable for a horizontal-axis wind machine. The flexible energy gathering cover comprises flexible skin, a skin support, a hose clamp and astepping motor; the flexible skin covers the circumference of the skin support, an air flow path is arranged inside the flexible skin, the hose clamp is concentrically arranged on the outer side of the flexible skin in a sleeving manner, and adjustment of the hose clamp is driven by the stepping motor. When the natural wind speed is lower than the designed safe wind speed of the wind machine, thehoop diameter of the hose clamp is reduced, the area of the flow path inside the flexible skin is simultaneously reduced until a gap between the tip of an impeller of the wind machine and the inner surface of the flexible skin reaches the minimum set value, the air leakage amount is reduced, the wind pressure is increased, and the starting performance of the wind machine is further improved. Whenthe natural wind speed is higher than the designed safe wind speed of the wind machine, the hoop diameter of the hose hoop is enlarged, so that the area of the flow path inside the flexible skin is simultaneously expanded until the wind speed in the flow path is reduced to be within the safe range, at the time, the wind machine does not need to be braked, sustainable power generation can be carried out, and the power generation amount of the wind machine is further improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, in particular to a flexible energy gathering cover suitable for a horizontal axis wind turbine. 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 wind turbine. [0004] For this reason, in order to overc...

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Problems solved by technology

[0005] However, although the traditional energy gathering hood can increase the wind speed, there is also a limitation, that is, when the natural wind speed is too high, due to the existence of the energy gathering hood, the wind speed in the energy gathering hood can easily exceed the design maximum wind speed of the wind turbine blades. , and at this time, in order to ensure the safety of the wind turbine, the wind turbine must be braked to stop power generation. In this way, the power generation and power generation range of the wind turbine will also be reduced

[0006] In addition, the traditional energy gathering cover will produce certain deformation and vibration under the wind load. Therefore, in order to ensure the safety of the wind turbine impeller during rotation, it is necessary to leave a gap between the blade tip of the wind turbine impeller and the inner wall of the energy gathering cover. Due to the large installation gap, the air leakage cannot be controlled in the optimal range, which also limits the further increase of wind turbine power generation to a certain extent.

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