傾斜した垂直軸風車の伴流特性

抄録

In an offshore wind turbine of the floating type, when the floater tilts due to waves, the axis of rotation of the wind turbine is also inclined to the wind. The inclination of axis may decrease the output because the effective flow velocity is reduced. On the other hand, the inclination may increase the output because a part of the downstream blade passes through a region that is not affected by the upstream it. Therefore, the purpose of this study is to clarify the effect of inclination of axis on the output characteristics of a small wind turbine. From the results in the case of low solidity turbine, the output characteristic shifts to the high tip speed ratio and the maximum value of it decreases, but it does not depend on the inclination direction. From the velocity profiles, it was observed that either the upper or lower part of the wake has a characteristic of low solidity turbine. Since this feature is symmetrical with respect to the inclination direction, the output characteristics does not depend on the inclination direction.