Modeling and Mitigation of Wind Turbine Noise Other Ampitude Modulation
report
Within the BEST project, ’Blade Extensions for Silent Turbines’, which ran from April 2023 to April 2025, the first commercially attractive application of permeable blade extensions ’Muteskin’ for the reduction of noise in onshore wind is developed. As a subgoal of the project, the benefit of MuteSkin (and permeable blade extensions in general) for (secondary) wind turbine acoustic phenomena such as low-frequency noise and amplitude modulation are being investigated, and other physical mitigation strategies are explored. Within the present work, a feasibility as sessment of modeling other amplitude modulation has been carried out. An integral modeling technique has been employed, which showed that local stall in case of high wind shear can result in other amplitude modulation, depending on the noise increase due to separated flow. This also implies that removing the stalled flow from the blade, e.g. by pitching the blades, can be an effective strategy to mitigate the mentioned modulation. It is recommended to validate the findings from the simulations by means of dedicated experiments, to further progress and reduce uncertainty on this topic.
Topics
TNO Identifier
1013959
Publisher
TNO
Collation
21 p.
Place of publication
Petten