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Effects of Freestream Turbulence in a Model Wind Turbine Wake

Author

Listed:
  • Yaqing Jin

    () (Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA)

  • Huiwen Liu

    () (College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210024, China)

  • Rajan Aggarwal

    () (Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA)

  • Arvind Singh

    () (Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, FL 32816, USA)

  • Leonardo P. Chamorro

    () (Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801, USA
    Aerospace Engineering, University of Illinois, Urbana, IL 61801, USA
    Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801, USA)

Abstract

The flow structure in the wake of a model wind turbine is explored under negligible and high turbulence in the freestream region of a wind tunnel at R e ∼ 7 × 10 4 . Attention is placed on the evolution of the integral scale and the contribution of the large-scale motions from the background flow. Hotwire anemometry was used to obtain the streamwise velocity at various streamwise and spanwise locations. The pre-multiplied spectral difference of the velocity fluctuations between the two cases shows a significant energy contribution from the background turbulence on scales larger than the rotor diameter. The integral scale along the rotor axis is found to grow linearly with distance, independent of the incoming turbulence levels. This scale appears to reach that of the incoming flow in the high turbulence case at x / d ∼ 35–40. The energy contribution from the turbine to the large-scale flow structures in the low turbulence case increases monotonically with distance. Its growth rate is reduced past x / d ∼ 6–7. There, motions larger than the rotor contribute ∼ 50 % of the total energy, suggesting that the population of large-scale motions is more intense in the intermediate field. In contrast, the wake in the high incoming turbulence is quickly populated with large-scale motions and plateau at x / d ∼ 3 .

Suggested Citation

  • Yaqing Jin & Huiwen Liu & Rajan Aggarwal & Arvind Singh & Leonardo P. Chamorro, 2016. "Effects of Freestream Turbulence in a Model Wind Turbine Wake," Energies, MDPI, Open Access Journal, vol. 9(10), pages 1-12, October.
  • Handle: RePEc:gam:jeners:v:9:y:2016:i:10:p:830-:d:80583
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    References listed on IDEAS

    as
    1. Göçmen, Tuhfe & Laan, Paul van der & Réthoré, Pierre-Elouan & Diaz, Alfredo Peña & Larsen, Gunner Chr. & Ott, Søren, 2016. "Wind turbine wake models developed at the technical university of Denmark: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 60(C), pages 752-769.
    2. Leonardo P. Chamorro & Fernando Porté-Agel, 2011. "Turbulent Flow Inside and Above a Wind Farm: A Wind-Tunnel Study," Energies, MDPI, Open Access Journal, vol. 4(11), pages 1-21, November.
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    1. repec:gam:jeners:v:11:y:2018:i:1:p:93-:d:125064 is not listed on IDEAS

    More about this item

    Keywords

    integral length scale; wake; wind turbine; large-scale motions;

    JEL classification:

    • Q - Agricultural and Natural Resource Economics; Environmental and Ecological Economics
    • Q0 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General
    • Q4 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy
    • Q40 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - General
    • Q41 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Demand and Supply; Prices
    • Q42 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Alternative Energy Sources
    • Q43 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy and the Macroeconomy
    • Q47 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy Forecasting
    • Q48 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Government Policy
    • Q49 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Other

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