Wind Turbine Noise Reduction by Blade Geometry Modification (original) (raw)

2015

Abstract

Noise is one of the main reasons for public objection to new wind farm projects. Aeroacoustic noise has been identified as the main noise generation mechanism from wind turbines. Studies show that trailing edge noise is the major noise source from an aerofoil. However, in a highly turbulent environment, leading edge sources could contribute to the far field noise significantly. Therefore it is important to precisely identify the significance noise sources and their distribution. A geometric improvement to the blade shapes could lead to reduction in noise generation. A numerical noise prediction model using an annular section of a wind turbine blade is validated in the present work. The same model is then used to simulate a modified blade geometry. Far field noise results are presented showing noise reduction for the modified blade.

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