Noise emission from wind turbines in wake - Measurement and modeling

Franck Bertagnolio*, Helge Aa Madsen, Andreas Fischer

*Corresponding author for this work

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The influence of the wake of an upstream turbine impinging another one located further downstream is studied focusing on the latter’s noise emission. Measurement data are investigated in the form of surface pressure fluctuations acquired using microphones flush-mounted in a wind turbine blade near its tip, characterizing the noise sources. Numerical results from a wind turbine noise model are also included in the analysis. The wind speed deficit and increased turbulence levels of the wake flow are clearly observed. Surface pressure measurements strongly support the fact that turbulent inflow noise is increased. However, numerical results show that the wake velocity deficit reduces noise in certain circumtances. This can compensate, or even sometime more than compensate, the additional noise emission expected as a result of the wake turbulence. Furthermore, noise amplitude modulation appears to increase when the turbine is impacted by the wake flow.
Original languageEnglish
Article number022001
Book seriesJournal of Physics: Conference Series
Issue number2
Number of pages10
Publication statusPublished - 2018
EventThe Science of Making Torque from Wind 2018 - Politecnico di Milano (POLIMI), Milan, Italy
Duration: 20 Jun 201822 Jun 2018
Conference number: 7


ConferenceThe Science of Making Torque from Wind 2018
LocationPolitecnico di Milano (POLIMI)
Internet address

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