Abstract
In this short paper, we have treated the aerodynamic performance of micro downwind rotor with coning soft blades experimentally. The test wind rotor has the tip diameter of 1.5 m and three two-dimensional NACA0018 blades of 0.15 m chord whose material is light, soft and pliable foam plastic for perfect safety. From the wind tunnel test, it is realized that the performance is manageable by the coning angle of the rotor blade. In the present case, an improvement of the performance in lower wind speeds is achieved by using the coning blade of 20°. Besides, owing to the torsional deformation of very soft blade, the self-power-control characteristic is observed in every test rotor regardless of coning angle in the range of 0°–20° under the wind speed less than 12 m/s.
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