Analytical Modeling of Modulated Rotating-Blade Noise : the Skipping Rope and the Darrieus Wind Turbine

The present study is about the modulations of the aerodynamic broadband noise heard from slowly rotating rotors with few blades. It is aimed at producing a fast-running prediction tool that could be used to assess the nuisance of Vertical-Axis Wind Turbines (VAWT) in the context of urban installatio...

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Bibliographic Details
Published in:Journal of physics. Conference series 2021-05, Vol.1909 (1), p.12010
Main Authors: Roger, Michel, Moreau, Stéphane
Format: Article
Language:English
Subjects:
Airfoil oscillations
Broadband
Inspection
Physics
Rope
Rotation
Turbine blades
Vertical axis wind turbines
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Summary:The present study is about the modulations of the aerodynamic broadband noise heard from slowly rotating rotors with few blades. It is aimed at producing a fast-running prediction tool that could be used to assess the nuisance of Vertical-Axis Wind Turbines (VAWT) in the context of urban installation. The simpler case of a skipping rope that only involves part of the modulation effect is addressed as a first step. The rope is split into segments for which an instantaneous sound-radiation model exists to yield an overall spectrogram. Finally, its time signature is reconstructed by additive synthesis. After inspection of existing databases from oscillatory-airfoil experiments, needs for data representative of the dynamic stall of VAWT blades are seen as the missing block to reconstruct a synthetic spectrogram.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1909/1/012010