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Effect on Torque and Thrust of the Pointed Tip Shape of a Wind Turbine Blade

Author

Listed:
  • Kyoungsoo Lee

    (Center for Energy and Environmental Sustainability, Incohen Co., Seoul 05510, Korea)

  • Shrabanti Roy

    (Center for Energy and Environmental Sustainability (CEES), Department of Mechanical Engineering, Prairie View A&M University (PVAMU), Prairie View, TX 77446, USA)

  • Ziaul Huque

    (Center for Energy and Environmental Sustainability (CEES), Department of Mechanical Engineering, Prairie View A&M University (PVAMU), Prairie View, TX 77446, USA)

  • Raghava Kommalapati

    (Center for Energy and Environmental Sustainability, Department of Civil & Environmental Engineering, Prairie View A&M University (PVAMU), Prairie View, TX 77446, USA)

  • SangEul Han

    (School of Architecture, Department of Architectural Engineering, Inha University, Inchoen 402-751, Korea)

Abstract

This paper presents the effect of the tip shape of a wind turbine blade on aerodynamic forces, including the effects of separation, transition and stall. A National Renewable Energy Laboratory (NREL) Phase-VI wind turbine blade was used, in which the shape of the tip was modified to a pointed tip. Computational fluid dynamics (CFD) simulations were employed for the analysis and the results were compared with the original NREL blade CFD and experimental data using ANSYS CFX (Ansys Inc., Delaware, PA, USA). To predict the separation and separation-induced transition on both near wall and far away, the shear-stress-transport (SST) Gamma-Theta turbulent model was used. The stall onset of a 20° angle of attack and its effects were also analyzed and presented. The value of torque with the pointed tip blade was found to be 3%–8% higher than the original NREL blade showing the benefit of the pointed tip. Normal force coefficient is lower at the tip for the pointed tip blade, which results in lower deformation of the blade. It was found that the pointed-tip blade is more efficient in terms of generating torque than the original NREL Phase-VI blade in the dynamic stall region of 10–15 m/s wind speeds.

Suggested Citation

  • Kyoungsoo Lee & Shrabanti Roy & Ziaul Huque & Raghava Kommalapati & SangEul Han, 2017. "Effect on Torque and Thrust of the Pointed Tip Shape of a Wind Turbine Blade," Energies, MDPI, vol. 10(1), pages 1-20, January.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:1:p:79-:d:87507
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    References listed on IDEAS

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    1. Lanzafame, R. & Messina, M., 2012. "BEM theory: How to take into account the radial flow inside of a 1-D numerical code," Renewable Energy, Elsevier, vol. 39(1), pages 440-446.
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    Cited by:

    1. 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.
    2. Ebrahimi, Abbas & Movahhedi, Mohammadreza, 2018. "Wind turbine power improvement utilizing passive flow control with microtab," Energy, Elsevier, vol. 150(C), pages 575-582.
    3. Ji, Baifeng & Zhong, Kuanwei & Xiong, Qian & Qiu, Penghui & Zhang, Xu & Wang, Liang, 2022. "CFD simulations of aerodynamic characteristics for the three-blade NREL Phase VI wind turbine model," Energy, Elsevier, vol. 249(C).
    4. Kiran Siddappaji & Mark Turner, 2022. "Improved Prediction of Aerodynamic Loss Propagation as Entropy Rise in Wind Turbines Using Multifidelity Analysis," Energies, MDPI, vol. 15(11), pages 1-44, May.

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