可変ピッチ式直線翼垂直軸風車における翼の揺動による動力損失

This works is intended to explore the effects of the pitching motion of blades on the performance of a vertical-axis wind turbine (VAWT) with straight blades.We designed a vertical-axis wind turbine with the variable-pitch angle mechanism, which consists of a blade and a four-bar linkage.When the turbine is driven by a wind, the pitch angle of blade varies sinusoidally without actuators.We measured the performance of VAWT by using an open circuit type wind tunnel.We estimated the power loss due to pitching motion of blades is proportional to the inertia moment of blades and the cube of turbine rotational speed.The experimental values agree with the theoretical results approximately. The power of VAWT decreases with increasing of the inertia moment of blades, the turbine rotational speed and the blades pitch angle amplitude