AIR PROPELLER OF WIND-DRIVEN POWER PLANTS WITH ADAPTIVE BLADES Russian patent published in 2014 - IPC F03D11/00 

FIELD: power industry.

SUBSTANCE: invention relates to wind-driven power plants, and namely to a structure of rotors of wind-driven power plants with a horizontal shaft. An air propeller consists of a hub, two connection plates and three pipes clamped between them by bolts for connection of root sections of blades. Each of the blades consists of a tubular spar and ribs (root, type and end ones) put on it in a movable manner. An end rib is connected to an end of a torsion passing inside the end part of the tubular spar. An opposite end of the torsion is attached to the tubular spar. All the sections, except for the root one, have an outline that is open along the rear edge. This contributes to low torsional stiffness of an adaptive blade. The root section has an aerodynamic flap representing a profile with an increased chord. A load of a centrifugal control is attached to the root rib. Torques created with the load of the centrifugal control and the aerodynamic profile, as well as with the closed outline of the root section are transmitted to the open outline of the blade throughout its length.

EFFECT: invention allows improving use coefficient of energy of abrupt wind gusts due to automatic elimination of stalling zones on propeller blades.

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