VANE-TYPE WIND-DRIVEN POWER PLANT Russian patent published in 2007 - IPC F03D1/00 

FIELD: vane-type wind-driven power plants at horizontal axis of rotation.

SUBSTANCE: proposed wind-driven power plant has blades, automatic power control unit, wind vane, wind direction control system, electric generator and support. Blades are mounted at angle of attack α≥7°; trailing and leading edges of blades are made according to formula of two parabolas: Y₁=K₁X^1/2; Y₂=K_2X ^1/2+2R_o which are tangent to circle at radius of R≥R_o; center of this circle is located at distance l≥2/3L, where R_o is preset radius of circle; L is projection of blade length on coordinate X; coefficients K₁ and K₂ are calculated by the following formulae: K₁=Y_1A/X_1A ^1/2; K₂=(Y_2B-2R_o)X_2B ^1/2, where A and B are points of tangency by parabolas Y₁ and Y₂, respectively of circle at radius R. Profiles of lower and upper surfaces of blades are formed by intersection on line of trailing edge of two parabolas: Y₃=K₃X^1/2 and Y₄=K₄X^1/2+2R_o, where K₃≥1; K₄=(0.4-0.8)K₃. Blade tip is bent through angle β≥60°. Besides that, plant may be provided with lightning-discharge protector in form of receptors at the blade tip. Parabola-shaped blade of wind-driven power plant increases wind efficiency due to increased area of blades. Mechanical power control system and wind protection reduce cost of wind-driven plant. Longitudinal and transverse oscillations are reduced by more than 20%.

EFFECT: enhanced efficiency and reliability; enhanced lightning protection.

2 cl,, 4 dwg