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Blade, wind turbine and method of operation

A technology for wind turbines and blades, which is applied in wind turbines, control of wind turbines, and wind power generation. It can solve problems such as blade running stalls, achieve the effects of increasing power generation, solving running stall problems, and suppressing aerodynamic transitions.

Active Publication Date: 2022-07-15
JIANGSU GOLDWIND SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a blade, a wind power generating set and its operation method to solve the problem of blade running stall

Method used

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  • Blade, wind turbine and method of operation
  • Blade, wind turbine and method of operation
  • Blade, wind turbine and method of operation

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Embodiment Construction

[0026] At present, there are two main types of stall control methods: 1) active stall control methods based on specific control strategies; 2) control methods for pneumatic accessories such as vortex generators (VGs). Optimizing the control strategy is an important means to avoid stall, mainly through blade pitch control to reduce the local angle of attack at each section of the blade in the spanwise direction, so as to keep away from stall, but it will also lose airfoil lift, resulting in loss of power generation; eddy currents occur The VG is a widely used pneumatic accessory. The VG is used to mix the velocity near the wall or to a certain degree to make the velocity near the wall evenly blended, which can effectively increase the stall critical angle of attack, but it is worth noting that , Although the vortex generator can increase the maximum lift and delay the stall, it will also increase the drag by 10% to 30%, and if VG is applied at the blade tip, it will bring additi...

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Abstract

Embodiments of the present invention provide a blade, a wind turbine and an operating method thereof. The blade includes a suction surface shell and a pressure surface shell, the blade further includes a plurality of discrete suction holes arranged on the suction surface shell, and the discrete plurality of suction holes are located between the main spar of the blade and the trailing edge of the blade . The blade for wind turbine can effectively suppress the aerodynamic transition (air flow separation) on the suction surface of the blade, expand the laminar flow area on the suction surface of the blade, solve the problem of blade running stall, thereby increasing the power generation of the unit; while ensuring the power generation, it does not It will bring aerodynamic noise to the unit.

Description

technical field [0001] The present invention relates to the technical field of wind power generation, and in particular, to a blade, a wind generator set and an operation method thereof. Background technique [0002] A wind turbine is an aerodynamic device that relies on blade airfoil lift to work. The upper surface (suction surface) of the airfoil is dominated by a large positive pressure gradient, so flow separation or stall is prone to occur at large angles of attack; the first half of the lower surface (pressure surface) of the airfoil is a negative pressure gradient, The second half is a small positive pressure gradient, so flow separation generally does not occur. On a microscopic level, "stall" is the loss of forward speed of the airflow near the blade wall. From the macroscopic analysis or from the integral quantity of the lift and drag coefficients of the airfoil, the lift increases linearly with the increase of the angle of attack, but after reaching a certain cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F03D1/06F03D7/02
CPCF03D1/0675F03D7/0256F05B2260/96Y02E10/72
Inventor 肖智龙陈威闻笔荣
Owner JIANGSU GOLDWIND SCI & TECH CO LTD
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