バタフライ風車翼のツイストモーメントの数値解析

抄録

Computational Fluid Dynamics (CFD) has been performed regarding the twist moment of a blade of a vertical axis type Butterfly Wind Turbine (7m diameter), whose blades were slanted around each blade axis to control the rotor speed. In the CFD analysis, wind speed and rotor rotational speed were assumed to be 1 m/s and 79 rpm, respectively, in accordance with the previous forcible rotation experiments using an induction motor. Predictions based on the Blade Element Momentum theory (BEM) agreed roughly with the CFD results. Averaged twist moment was almost proportional to the twist angle when it was less than 10 degrees. As the results of the additional CFD analyses, vertical displacement of a blade did not influence on the twist moment.