Noise emission from wind turbines in wake - Measurement and modeling

Abstract

Abstract. 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.

Suitability Analysis of Selected Methods for Modelling Infrasound and Low-Frequency Noise from Wind Turbines

“…The authors found good agreement between the measured and calculated results when background noise is neglected. The results of the proposed model correctly reproduce the quantitative increase in the ILFN as a function of wind speed; although, in some cases, differences with the measured data are apparent in some frequency ranges [32].…”

“…The computational model proposed in [27] has been verified experimentally in papers [31,32]. The authors compared the results of the numerical calculations with the measured results for two test wind turbines located at the DTU-Riso station.…”