Abstract
In this study, the influence of the flow around the impeller on the broadband noise in the high frequency domain generated by a propeller type wind turbine is discussed. The actual wind turbine is measured by the wind tunnel test; the flow around the impeller immersed in the uniform flow is solved by the numerical simulation. In comparison on the free torque condition, the noise of the tip speed ratio 12 becomes 7.6 dB larger than the noise on the tip speed ratio 8.2 due to the broadband noise in the high frequency domain. Because the flow is separated at the vicinity of the leading edge from the hub side to mid-span, the aerodynamic noise is concentrated at the leading edge side, whereas the noise source of the blade tip side concentrated to the trailing edge side because the flow is attached to the blade.
