ウエルズタービン動翼から発生する空力音の低減に関する基礎研究

抄録

The rotor of Wells turbine consists of several symmetrical airfoils positioned around a hub with their chord planes normal to rotational axis. In general, two-dimensional blade is used as the airfoil of Wells turbine. In the present paper the attention is focused on the effect of plasma actuator on aerodynamic sound radiated from two-dimensional airfoil. We measured the aerodynamic sound radiated from the airfoil with plasma actuator near the trailing edge of the airfoil. At the normal airfoil, discrete frequency noise clearly observed at small attack angle for Re=0.9×10⁵～1.2×10⁵. The plasma actuator was effective to reduce the discrete frequency noise radiated from airfoil. This noise depended on the actuator location, geometry of electrode, applied frequency, the electrode length of plasma actuator. We have discussed the effective geometry to reduce the discrete frequency noise.