Noise directivity from a vertical axis wind turbine
2015 (English)In: Proceedings of the 6th InternationalÂ Conference on Wind Turbine Noise: Glasgow 20-23 April 2015, 2015Conference paper (Refereed)
The directivity of wind turbine noise is of widespread interest and has received attention over an extended period. The reason for this is partly that noise optimization procedures can be implemented in order to increase the efficiency of the power output. Although directivity of horizontal axis wind turbines (HAWTs) are well understood, the directivity pattern around vertical axis wind turbines (VAWTs) are less well investigated.This paper presents measurements of directivity on a 200 kW VAWT, a so called H-rotor, with variable speed and a tower height of 40 m. The turbine, which is situated in a flat agricultural landscape close to Falkenberg at the Swedish west coast, is one of the world’s largest today operational VAWTs. Experimental results as well as a theoretical model based on the turbulent-boundary-layer trailing-edge (TBL-TE) noise suggest higher noise levels upwind of the rotor and the lowest noise levels in the perpendicular directions. Moreover, modulation analysis of the measurements indicates the presence of modulations but the results are inconclusive.
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IdentifiersURN: urn:nbn:se:uu:diva-251891OAI: oai:DiVA.org:uu-251891DiVA: diva2:808028
The 6th International Conference on Wind Turbine Noise, Glasgow 20-23 April 2015