CA9: Analysis of a Stall-Resistant Aerofoil in View of Wave Power Conversion

摘要

Wave energy power take-off typically consists of a Wells turbine. This self-rectifying axial air turbine has shown to be constrained by severe stall at high angle of attack or in the supercritical range. This paper presents an experimental and numerical investigation of the CA9 aerofoil, which was optimised for stall resistance. Analysis was done for a 0.6m rotor and tests were carried out at Re = 5×10~5 and Ma = 0.2. Results showed that the CA9 profile was more resistant to stall and had a higher average efficiency than NACA0015; thus being more suitable for wave energy conversion systems. Numerical data was benchmarked using experimental ones and provided an insight in the separation mechanism of the flow. Guide vanes improved both starting and running characteristics of rotor.