Vertical Axis Wind Turbine with Automatic Speed Control for Home Builders. Final Report

摘要

The object of this contract was to design, construct and test the hardware of a simple and reliable vertical axis wind turbine. The result of this program has been the development of a simple vertical axis wind turbine with a 6 meter rotor diameter and three blades, each 3 meters high. Each blade support arm streamline cuff ends in a 0.66 meter long drag type flap which is rotated under the action of centrifugal force when the adjustable design feathering rpm is reached. Each flap is actuated independently of the other two. Under normal conditions anyone of the three drag flaps can provide sufficient aerodynamic braking to prevent overspeeding and rotor damage. The reliability of this overspeed control system is obtained by having three drag flaps, two of which function as back up. The feathering rpm is made adjustable by varying the air pressure in three automotive pneumatic shock absorbers. (ERA citation 10:025504)