Experimental Study on Wind Turbine Airfoil Trailing Edge Noise Reduction Using Wavy Leading Edges

Yudi Xing, Xingyu Wang, Weijie Chen (), Fan Tong and Weiyang Qiao
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Yudi Xing: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Xingyu Wang: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Weijie Chen: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China
Fan Tong: Key Laboratory of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang 621000, China
Weiyang Qiao: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710129, China

Energies, 2023, vol. 16, issue 16, 1-15

Abstract: Aerodynamic noise produced by the rotating blade is an important hindrance for the rapid development of modern wind turbines. Among the various noise sources, the airfoil trailing edge noise contributes a lot to the wind turbine noise. The control of wind turbine airfoil trailing edge self-noise by bio-inspired sinusoidal wavy leading edges is experimentally studied in a semi-anechoic chamber. The noise radiated by the baseline NACA 0012 airfoil and various wavy airfoils is measured using a planar microphone array consisting of fifty-two microphones. The noise source identifications are achieved by using the CLEAN-SC method. The effects of velocity and angle of attack on noise radiation of the baseline airfoil are analyzed in detail. The noise control law of the wavy amplitude and wavelength on airfoil trailing edge noise is explored. Based on the acoustic beamforming results, the noise control effects of the wavy leading edges are intuitively demonstrated. In general, the wavy leading edge with a larger amplitude and smaller wavelength has a better effect on the airfoil trailing edge noise reduction. The maximum sound pressure level reduction can be up to 33.9 dB. The results of this study are expected to provide important information for wind turbine aerodynamic noise control.

Keywords: wind energy; wind turbine; noise control; wavy leading edges; trailing edge noise (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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