Determination of Aerodynamic Sound Sources on Periodicity Noise Generated from a Micro Wind Turbine

Abstract

To discuss the relationship between the periodicity noise and the aerodynamic noise source of a wind turbine, the characteristics of the actual wind turbine were measured by a wind tunnel; moreover, the flow around the impeller immersed in the uniform flow was solved by numerical simulation. In the observed wind turbine, when the mainstream velocity was 7.4 m/s or more, the power coefficient reached maximum at tip speed ratio 8. When the mainstream velocity increased in the driving condition of the maximum power point, the aerodynamic noise increased due to the periodicity noise in the vicinity of 1000 Hz and the broadband noise in the high-frequency domain. The noise sources were concentrated at the leading edge and trailing edge on the suction surface side. We experimentally indicated that the pressure fluctuation of the leading edge was the source of the periodicity noise.

Performance Assessment of a Calm Flapping Wind Turbine with Small Attack Angle

“…However, the wind turbine provides clean renewable energy but it has also some complications. Solving noise annoyance generated by the wind turbine is one of the important technical issues for the development of wind turbine used in the place where is close to the residential arena [6]. Also, mitigate the bird and bat mortalities caused by turbines is an area of research to be improved [7] [8].…”