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Wake impact on aerodynamic characteristics of horizontal axis wind turbine under yawed flow conditions

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  • Lee, Hakjin
  • Lee, Duck-Joo

Abstract

Wind turbines spend most of time in complex and unsteady environment, such as yawed flow, atmospheric wind turbulence, wind shear, and gust. Under yawed flow condition, velocity component parallel to the rotating plane causes a development of skewed wake structure, thus leading to an azimuthal variation in the aerodynamic loads on wind turbine blades. Moreover, the trailing and shed wake vortices unequally expand, and a strong wake interaction between the hub and tip vortices, and the asymmetrical velocity deficit around the rotor area occur. In the present study, the impacts of the skewed wake on the unsteady aerodynamic behavior around rotor blade were numerically investigated and a wake deflection mechanism was discussed in detail. For this purpose, the nonlinear vortex lattice method (NVLM) coupling with a time-accurate vortex particle method (VPM) was used. A numerical simulation on the NREL Phase VI wind turbine model, exposed to a low wind speed with different yaw angles, was carried out and predicted results were compared against measurements. Comparison results showed that the aerodynamic loads can be accurately calculated, even for highly yawed flow conditions and complex wake dynamics can be clearly observed.

Suggested Citation

  • Lee, Hakjin & Lee, Duck-Joo, 2019. "Wake impact on aerodynamic characteristics of horizontal axis wind turbine under yawed flow conditions," Renewable Energy, Elsevier, vol. 136(C), pages 383-392.
    • Handle: RePEc:eee:renene:v:136:y:2019:i:c:p:383-392
    DOI: 10.1016/j.renene.2018.12.126
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    References listed on IDEAS

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    1. Lee, Hakjin & Lee, Duck-Joo, 2019. "Numerical investigation of the aerodynamics and wake structures of horizontal axis wind turbines by using nonlinear vortex lattice method," Renewable Energy, Elsevier, vol. 132(C), pages 1121-1133.
    2. Shen, Xin & Zhu, Xiaocheng & Du, Zhaohui, 2011. "Wind turbine aerodynamics and loads control in wind shear flow," Energy, Elsevier, vol. 36(3), pages 1424-1434.
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    Citations

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    Cited by:

    1. Ali, Qazi Shahzad & Kim, Man-Hoe, 2022. "Power conversion performance of airborne wind turbine under unsteady loads," Renewable and Sustainable Energy Reviews, Elsevier, vol. 153(C).
    2. Lee, Hakjin & Lee, Duck-Joo, 2019. "Effects of platform motions on aerodynamic performance and unsteady wake evolution of a floating offshore wind turbine," Renewable Energy, Elsevier, vol. 143(C), pages 9-23.
    3. Takanori Uchida, 2020. "Effects of Inflow Shear on Wake Characteristics of Wind-Turbines over Flat Terrain," Energies, MDPI, vol. 13(14), pages 1-31, July.
    4. Lee, Hakjin & Lee, Duck-Joo, 2020. "Low Reynolds number effects on aerodynamic loads of a small scale wind turbine," Renewable Energy, Elsevier, vol. 154(C), pages 1283-1293.
    5. Modali, Pranav K. & Vinod, Ashwin & Banerjee, Arindam, 2021. "Towards a better understanding of yawed turbine wake for efficient wake steering in tidal arrays," Renewable Energy, Elsevier, vol. 177(C), pages 482-494.
    6. Martin Cardaun & Björn Roscher & Ralf Schelenz & Georg Jacobs, 2019. "Analysis of Wind-Turbine Main Bearing Loads Due to Constant Yaw Misalignments over a 20 Years Timespan," Energies, MDPI, vol. 12(9), pages 1-11, May.
    7. Nakhchi, M.E. & Naung, S. Win & Dala, L. & Rahmati, M., 2022. "Direct numerical simulations of aerodynamic performance of wind turbine aerofoil by considering the blades active vibrations," Renewable Energy, Elsevier, vol. 191(C), pages 669-684.
    8. Zhu, Xiaoxun & Chen, Yao & Xu, Shinai & Zhang, Shaohai & Gao, Xiaoxia & Sun, Haiying & Wang, Yu & Zhao, Fei & Lv, Tiancheng, 2023. "Three-dimensional non-uniform full wake characteristics for yawed wind turbine with LiDAR-based experimental verification," Energy, Elsevier, vol. 270(C).

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