Blades, blade synergistic system and wind generating set

Abstract

The invention discloses blades, a blade synergistic system and a wind generating set. The blade synergistic system comprises diversion tubes, an air pump and a controller; the diversion tubes are pre-embedded at least in the suction faces in the suction faces and the pressure faces of the blades and located on the sides, close to the rear edges of the blades, of main beams of the blades, and the diversion tubes are each provided with a plurality of air ports so as to communicate with the outside world; the air pump is connected with the diversion tubes; and the controller controls the air pumpto conduct air suction or air injection through the diversion tubes at least based on the air speed and the current incoming flow attack angle. Through the blade synergistic system, on the basis thatthe structure and the aerodynamic performance of the blades are not changed, airflow on the surfaces of the blades is intervened, so that the stall phenomenon is avoided.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular, the invention relates to a blade with a stall protection structure, a blade synergistic system and a wind power generating set with the blade synergistic system. Background technique [0002] When the wind turbine is running, if the angle of attack of the airflow relative to the blade is too large, the phenomenon of airflow separation will occur at the trailing edge of the blade, also known as stall. At this time, the airflow flowing over the surface of the blade changes from laminar flow to turbulent flow. When a stall occurs, the lift force on the blade decreases rapidly and the resistance increases rapidly. Therefore, in the normal working state of the blade, it is necessary to avoid the stall of the blade as much as possible. [0003] In order to avoid stalling, the usual method is to reduce the pressure difference on both sides. Opening at the trailing edge of th...

AI Technical Summary

Problems solved by technology

Although this method can improve the aerodynamic performance of the blade root and blade tip to a certain extent, the blade root is subjected to various loads such as tension, compression, bending, torsion, etc. under different working conditions, and the load is relatively large and complex, and the opening is not conducive to structural integrity.

Also, neither the tip nor the root are the primary areas for lift generation, so opening holes in such areas has limited effect

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