The control of blades orientation to air flow in wind energetic device

New wind energetic devices with controlled orientation of flat blades to air flow are developed. The proposed device consists of main central wheel and several flat blades hinged to the wheel with the ability to change the orientation of their working surfaces relative to the direction of incoming wind flow. Experimental analysis of blade's interaction with air flow is performed. Aerodynamic coefficients for blade's drag and lifting forces are determined experimentally in wind tunnel ARMFIELD. Optimization of system parameters is made using programs Excel and MathCad. To increase the efficiency of energy transformation, it is proposed to change by special law an angular position of flat blade during rotation of the central wheel. For this purpose axles of blades are kinematically connected with the central wheel. It is shown that optimal angular rotation frequency ratio between central wheel and blade is equal to 2. Serviceability and main advantages of the proposed method are confirmed by experiments with physical model of airflow device.