出力係数の周期変動安定性を目指した新形状サボニウス型風車の数値流体解析

抄録

Savonius type wind turbines are suitable for installation in urban areas because of their advantages in less wind-direction dependences and small-sized constructions. One of the major problems is its poor and unstable power coefficient mainly due to negative torques on returning blade in a cycle. These periodic fluctuations of the output power coefficient should be improved by decreasing rotation-angle dependences of the turbine blades. In this study, in order to assess the effects of new additional blades on the power coefficient, numerical simulations were carried out, and flow around the rotor was considered by using the regularized lattice Boltzmann method (RLBM). The virtual flux method was used to express the shape of the rotor on a Cartesian grid. As a results, the new shape improved the output power coefficient by 21.6% compared to the classical type owing to the additional ellipsoidal blades.