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Reduced frequency effects on combined oscillations, angle of attack and free stream oscillations, for a wind turbine blade element

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  • Gharali, Kobra
  • Gharaei, Eshagh
  • Soltani, M.
  • Raahemifar, Kaamran

Abstract

The dynamic stall phenomenon in horizontal axis wind turbines causes significant energy waste and sometimes wind turbine failure. For modeling a deep dynamic stall phenomenon of a horizontal axis wind turbine blade element, a numerical simulation of an oscillating NREL's S809 airfoil has been performed at Reynolds number of 106 in an unsteady incident velocity; the velocity oscillates with the same frequency as the airfoil oscillation but with different phase difference (ϕ). Since the sliding mesh technique has been applied for the airfoil oscillation, an O-type grid is created resulting in the reduced number of mesh layers. A specific correction improves the quality of the O-type mesh near the sharp trailing edge. For the combined oscillations, the effects of the reduced frequency (k) in the range of 0.05≤k≤0.15 are investigated with the phase differences of ϕ=−π2, +π2,π. The results show their significant dependency on k at specific ϕ values in particular at ϕ=−π2. Combined effects of k and ϕ can change the aerodynamic loads during dynamic stall significantly compared to loads from a case with a steady incident velocity. These significant changes in the flow structure and aerodynamic loads can affect the wind turbine performance during the dynamic stall phenomenon.

Suggested Citation

  • Gharali, Kobra & Gharaei, Eshagh & Soltani, M. & Raahemifar, Kaamran, 2018. "Reduced frequency effects on combined oscillations, angle of attack and free stream oscillations, for a wind turbine blade element," Renewable Energy, Elsevier, vol. 115(C), pages 252-259.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:252-259
    DOI: 10.1016/j.renene.2017.08.042
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    References listed on IDEAS

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    Citations

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    Cited by:

    1. Bakhtiari, Ehsan, 2019. "Super-hydrophobicity effects on performance of a dynamic wind turbine blade element under yaw loads," Renewable Energy, Elsevier, vol. 140(C), pages 539-551.
    2. Bakhtiari, Ehsan & Gharali, Kobra & Chini, Farshid & Al-Haq, Armughan & Nathwani, Jatin, 2023. "Slip influence on a blade performance under different pitch-oscillating motion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    3. Wen, Binrong & Tian, Xinliang & Dong, Xingjian & Peng, Zhike & Zhang, Wenming & Wei, Kexiang, 2019. "A numerical study on the angle of attack to the blade of a horizontal-axis offshore floating wind turbine under static and dynamic yawed conditions," Energy, Elsevier, vol. 168(C), pages 1138-1156.
    4. Mohammad Souri & Farshad Moradi Kashkooli & Madjid Soltani & Kaamran Raahemifar, 2021. "Effect of Upstream Side Flow of Wind Turbine on Aerodynamic Noise: Simulation Using Open-Loop Vibration in the Rod in Rod-Airfoil Configuration," Energies, MDPI, vol. 14(4), pages 1-24, February.
    5. Zhuang, Chen & Yang, Gang & Zhu, Yawei & Hu, Dean, 2020. "Effect of morphed trailing-edge flap on aerodynamic load control for a wind turbine blade section," Renewable Energy, Elsevier, vol. 148(C), pages 964-974.
    6. Mohammad Hassan Ranjbar & Behnam Rafiei & Seyyed Abolfazl Nasrazadani & Kobra Gharali & Madjid Soltani & Armughan Al-Haq & Jatin Nathwani, 2021. "Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct," Energies, MDPI, vol. 14(18), pages 1-16, September.
    7. Razavi Dehkordi, Mohammad Hossein & Soltani, Mohammad Reza & Davari, Ali Reza, 2019. "Statistical analysis on the effect of reduced frequency on the aerodynamic behavior of an airfoil in dynamic physical motions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 535(C).

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