Numerical Simulation of 3-D Stall Mechanism on Wells Turbine for wave-Power Generating System

摘要

Wells turbine has the cascade whose stagger angle is 90 degrees, namely the blades are perpendicular to the axial velocity. 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 in the large attack angle where the performance is strongly influenced, especially, the self-starting. 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.