WIND PROFILE EFFECT ON SMALL WIND TURBINE NOISE GENERATION Aki

  • Avramenko A
  • Backmann J
  • Grönman A
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Abstract

Small wind turbines are usually located close to buildings, and therefore, the noise generation can be both annoying and a risk for the health. The number of wind turbine installations is growing, and the request for distributed small scale energy pro- duction is one of the future trends in the energy market. The wind behavior is usually non-linear close to the ground surface. Especially, small turbines with low nacelle heights have a rel- atively declined wind profile at the blades. The chosen model- ing approach coupled three-dimensional RANS with the Ffowcs Williams-Hawkings acoustic analogy. A series of numerical sim- ulations was performed to study the reliability of the modeling. Three different grids were used to study the grid independency close to the turbine nominal tip to speed ratio. A reasonable agreement in the noise trends was found between the modeling and the measurements and previous studies. This encouraged us to study three different wind profiles with a down scaled wind turbine model. The results indicate that the aerodynamic noise of small turbines is not markedly affected by the wind profile

Author-supplied keywords

  • GT2014-25622

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Authors

  • Anna Avramenko

  • Jari Backmann

  • Aki Grönman

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