波力発電用セイルウィングタービンに関する研究

（性能に及ぼす案内羽根の影響）

抄録

Wave energy can be converted into electrical energy by using wave energy converter. In a wave energy plant with oscillating water column (OWC), the water column in the air chamber oscillates with the sea wave motion and it causes an alternating airflow inside the chamber. The airflow then rotates an air turbine connected to a generator. A sail wing turbine has been proposed for OWC wave energy conversion by the authors. The sail shape changes in the reciprocating airflow and it always rotates in the same direction. In this study, in order to achieve a further improvement in the performance of the sail wing turbine, the guide vanes were installed before and after the rotor and the effect of guide vane on the performance was investigated numerically by computational fluid dynamics (CFD) analysis under steady flow conditions. As a result, the effect and usefulness of the sail wing turbine with guide vane for bi-directional airflow was clarified. Further, it was found that the peak efficiency η_P=0.455 of the sail wing turbine with guide vane was shown at turning angle of guide vane δ=80° and flow coefficient φ=1.58.