波力発電用ウェルズタービンの三次元失速と生成機構の推定(流体工学, 流体機械)

抄録

Wells turbine has the cascade whose stagger angle is 90 degrees, namely the blades are perpendicular to the axial velocity. The blades can rotate in the same direction irrespective of reciprocating airflow. The good performance is required from 0 to 90 degrees of attack angle because the turbine is operated in the oscillating airflow produced with wave energy. Furthermore, very interesting and complex flows are experimentally observed by the oil film method with a water tunnel in the large attack angle where the performance such as self-starting is strongly influenced. In order to understand these phenomena in detail, CFD code is developed by authors with SIMPLE algorithm and domain decomposition. This paper tries to analyze the mechanism of these three dimensional flows around the turbine with the numerical analysis, focusing on the off design condition.