Acoustic measurements of a DU96-W-180 airfoil with flow-misaligned serrations at a high Reynolds number in a closed-section wind tunnel

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Abstract

Trailing-edge serrations are passive noise reduction add-ons widely used in wind-turbine applications. This study presents acoustic beamforming results of microphone array measurements of a cambered airfoil (DU96-W-180) in a closed-section wind-tunnel at a Reynolds number of industrial interest. Two different serration geometries with different lengths were tested and compared with the straight-edge baseline airfoil. The serrations were set at a flap angle of 6 degrees. Several flow velocities and angles of attack were tested at three chord-based Reynolds numbers ranging from 5105 to 1.5106. A phased microphone array was used to obtain source maps of the trailing-edge noise; Particle Image Velocimetry (PIV) was employed to obtain information about the turbulent boundary layer approaching the trailing edge; further, a numerical simulation using the Lattice Boltzmann Method (LBM) was performed for comparison. Far-field noise from the experimental data and computations shows a satisfactory agreement. Noise reductions of several dB were obtained, especially at lower frequencies. An increase in high-frequency noise is observed after a crossover frequency, which is assumed to be due to the set flap angle.
Original languageEnglish
Title of host publication7th International Conference on Wind Turbine Noise
Subtitle of host publicationRotterdam – 2nd to 5th May 2017
Number of pages13
Publication statusPublished - 2017
Event7th International Conference on Wind Turbine Noise: Wind Turbine Noise 2017 - Willem Burger Complex, Rotterdam, Netherlands
Duration: 2 May 20175 May 2017
Conference number: 7
https://www.windturbinenoise.eu/content/conferences/1-wind-turbine-noise-2017/

Conference

Conference7th International Conference on Wind Turbine Noise
CountryNetherlands
CityRotterdam
Period2/05/175/05/17
Internet address

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