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.
Highlights
A micro wind turbine can be used in a variety of ways; for instance, backup power at a time of disaster, an auxiliary power supply in a public place, power supply in an isolated place, and so on
Because a wind turbine is subject to a Feed-in Tariff that has been executed since July 2013, it is expected to be used as a power supply for a smart grid
In the vicinity of tip speed ratio 8, the noise level of the wind turbine is increased because the impeller is rotating with a high rotating speed due to the fast mainstream velocity
Summary
A micro wind turbine can be used in a variety of ways; for instance, backup power at a time of disaster, an auxiliary power supply in a public place, power supply in an isolated place, and so on. Our research group is experimentally investigating the relation between the aerodynamic noise generated from a micro propeller wind turbine and the flow around the impeller [2] [3]. Roger and Moreau extended Amiet’s trailing edge noise model to the limited chord length model [6] [7]; they indicated that the broadband noise in the high-frequency domain is closely related to trailing edge noise. For the latter periodicity noise, there are many unconfirmed results. Based on the analysis of the pressure fluctuation quantities on the blade surface of the numerical simulation, we discuss the sources of the periodicity noise
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