Ventilation vortex reduction device and wind turbine blade with built-in ventilation vortex reduction device

Abstract

The invention discloses a ventilation vortex reducer and a wind turbine blade internally provided with the same, and belongs to the technical field of wind turbines. According to the ventilation vortex reducer, the improvement design of the ventilation vortex reducer is provided aiming at the airflow separation phenomenon of the wind turbine blade, a section tapered round table wall surface internally provided with a spiral structure serves as a device body, and an air-duct tapered air inlet is formed in the side wall close to the large radius end of the round table wall surface. According tothe ventilation vortex reducer, enough air can be collected, and it is guaranteed that a vortex with sufficient strength can be produced through section changing and tangential inflowing. The invention further discloses the wind turbine blade internally provided with the ventilation vortex reducer. Device air outlets are attached to small holes formed in different showing directions of the suctionsurface of the wind turbine blade, and the outlets all face the trailing edge of the blade. An air inlet of the ventilation vortex reducer faces the root of the blade, the effects of lift augmentation and drag reduction are achieved at a high attack angle, and the ventilation vortex reducer has no influence on the surface resistance of the blade at a small attack angle.

Description

Technical field [0001] The invention discloses a ventilation and vortex reduction device and a wind turbine blade built-in the ventilation and vortex reduction device, belonging to the technical field of wind turbines. Background technique [0002] As a part of wind turbines to capture wind energy, blades play a vital role in the entire wind power generation process, and there are greater restrictions on blade design. In order to achieve the ideal aerodynamic efficiency, it is necessary to set different chord length, thickness, twist angle and even airfoil at different span directions of the blades. The shape requirements are high, but this design destroys the ideal airfoil conditions and is easy to cause airflow. Separation, causing the wind turbine to stall. Wind turbines in separate stalls have reduced efficiency, leading to deterioration of stability and even serious accidents. [0003] When the incoming flow passes through the solid boundary, the fluid velocity on the bounda...

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Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the above-mentioned background technology, to provide a ventilation vortex reduction device and a wind turbine blade built with the ventilation vortex reduction device, which not only realizes the delay of the surface stall phenomenon of the wind turbine blade at a large angle of attack, but also It avoids the defect that the ventilation vortex reduction device increases the resistance of wind turbine blades at small angles of attack, and solves the problem that although the existing vortex generators externally placed on the surface of the blades can increase the lift and reduce drag at large angles of attack, they cannot The technical problem of reducing the performance of wind turbine blades by increasing drag when cornering

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