Contribution
Modelling of Flow-Acoustic Sound Sources on the Rotor Blade of a Wind Turbine
* Presenting author
Abstract:
A good supply of sustainable energy is a key challenge of our time. Noise imission in residential areas are a limiting factor in the construction of new wind turbines. The allowable limit values are set by law.The noise emitted by wind turbines is made up of two superimposed noise sources. On the one hand, aerodynamic sound is generated by the interaction between the flow and the wind turbine structure. On the other hand, structural vibrations caused by periodic forces in the machine emit sound from the large surfaces of the wind turbine.As part of the Wind Energy Total Sound research project, an approach is being developed that makes it possible to predict the flow-induced sound of a complete wind turbine during operation. The aim is to reconstruct the 3D flow field from 2D flow cross-sections. In particular, the reconstruction of 3D turbulence poses a major challenge. Both the effect of the frequency-dependent coherence length of the flow structures and the resulting flow-acoustic source mechanisms must be modelled with sufficient accuracy from the 2D sections. It is being investigated whether 3D flow-acoustic sources can be reconstructed using 2D simulations and various interpolation approaches.