Numerical modeling of aeroacoustic processes during the flow around wind turbine blade segments
DOI:
https://doi.org/10.17721/1812-5409.2026/1.13Keywords:
aeroacoustics, numerical modeling, wind turbines, blade segments, aerodynamic noise, Direct Acoustic Simulation, Ffowcs Williams – Hawkings analogyAbstract
The paper presents a numerical methodology for studying aeroacoustic processes that occur during flow around wind turbine blade segments. The methodology is based on solving the compressible Navier – Stokes equations using the large eddy simulation (LES) method for accurate modeling of turbulent flows, which allows taking into account the complex interaction of hydrodynamic and acoustic phenomena. The proposed approach consists in applying the direct acoustic method (DAS) for detailed analysis of the near field and the Fawkes Williams – Hawkings (FW-H) analogy for effective prediction of noise in the far field.
To verify the methodology, numerical experiments were conducted for the NACA0012 airfoil in transient flow regimes. Key flow features are reproduced, such as boundary layer separation, formation of separation zones, transition of the boundary layer to a turbulent state with reattachment to the streamlined surface, formation of vortex structures and their interaction with the trailing edge as the main source of aerodynamic noise. A comparison of the obtained distribution of acoustic characteristics in the near field with known calculation data is presented.
The noise characteristics of the NACA0012 profile in the near field were studied using the DAS method, establishing a connection between the aerodynamic features of the flow and the mechanism of acoustic fluctuations generation. The noise characteristics in the far field were also studied using the FW-H analogy. Spectral analysis, performed based on the fast Fourier transform algorithm, demonstrated the agreement of the obtained tonal noise frequencies obtained by the DAS and FW-H methods, as well as correlation with known experimental data.
The developed methodology is an effective tool for studying noise generation mechanisms and can be applied in creating low-noise designs of wind turbine blades.
Pages of the article in the issue: 106 - 114
Language of the article: Ukrainian
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