Abstract
In the present paper the attention is focused on the characteristics of tonal noise at a discrete frequency radiated from Wells turbine for wave power conversion. We measured the sound pressure level (SPL) of aerodynamic sound radiated from Wells turbine which operated at the low attack angle. The experimental investigations have been performed under steady flow condition. The effects of rotational speed, blade profile, blade number and attack angle on the tonal noise at discrete frequency were investigated experimentally. The overall level of SPL increased as the rotational speed of Wells turbine increased. The noise proportional to the rotational speed and its overtone components increased. The overall level of SPL increased also at NACA0012 and low attack angle. The tonal noise at a discrete frequency was generated from Wells turbine of NACA0012 and low attack angle.
