Identification and analysis of the source of high-frequency aerodynamic noise from the blade tip region of wind turbines

摘要

An acoustic array test was performed on the near wake sound field of a horizontal-axis wind turbine under different wind speeds and tip speed ratios, with the wind wheel rotation surface as the sound source plane. The distribution of high-frequency sound sources was analyzed using data from array microphones; the data were collected from all channels, and the beamforming algorithm was used for calculation. The results showed that the positions of the high-frequency sound source on the blades were mainly concentrated in a specific area. The distribution of the sound source was asymmetrical, and the positions of the sound source on the blade did not vary with the changes in the tip speed ratios and wind speed.