Analysis of the acoustic emission of a modified segment of a wind turbine blade with a NACA 0012 airfoil
DOI:
https://doi.org/10.17721/1812-5409.2025/2.13Keywords:
aerodynamic noise, wind turbine, NACA0012 airfoil, serrated edge, experimental investigation, acoustic measurements, FFT, acoustic emissionAbstract
The relevance of the study is due to the need to reduce the noise pollution that occurs during the operation of wind power plants, in particular, in densely populated or environmentally sensitive regions. One of the promising approaches to reducing the acoustic radiation of wind turbine blades is the modification of their geometry to control turbulent flow structures. This paper presents the methodology and results of an experimental study of aerodynamic noise generated by a NACA0012 blade profile. The effect of periodic notches on the trailing edge on the acoustic characteristics of the profile is studied. The aim of the work is to assess the effectiveness of the notched trailing edge in reducing the level of aerodynamic noise. The study was conducted in an anechoic chamber using physical models of the profile manufactured by 3D printing, and acoustic measurements were performed using a sound level meter with subsequent data processing using the Fast Fourier Transform (FFT) method. The experiments covered different incident flow velocities (from 10 to 20 m/s) and angles of attack (0° and 5°), and the results are presented in the form of sound pressure spectra. It was found that the modified profile provides a reduction in the sound pressure level of up to 7 dB compared to the standard profile. The effect is especially pronounced in the frequency range up to 8 kHz, typical of vortex noise sources at relatively low flow velocities. The proposed approach demonstrates high efficiency and can be applied to optimize the designs of wind turbines, as well as other rotating elements, such as UAV propellers or fans.
Pages of the article in the issue: 95 - 100
Language of the article: Ukrainian
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