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Aerodynamic Analysis of a Wind-Turbine Rotor Affected by Pitch Unbalance

Author

Listed:
  • Francesco Castellani

    (Department of Engineering, University of Perugia, via G. Duranti 93, 06125 Perugia, Italy)

  • Abdelgalil Eltayesh

    (Mechanical Engineering Department, Benha Faculty of Engineering, Benha University, Benha 13512, Egypt)

  • Matteo Becchetti

    (Department of Engineering, University of Perugia, via G. Duranti 93, 06125 Perugia, Italy)

  • Antonio Segalini

    (KTH Royal Institute of Technology, FLOW, STandUP for Wind, Osquars Backe 18, 10044 Stockholm, Sweden)

Abstract

The aerodynamics of a rotor with pitch imbalance has been investigated experimentally and numerically in the present work. The comparison of mean velocity and turbulence intensity in the balanced and unbalanced cases indicated that a pitch imbalance modifies both the mean velocity and the turbulent activity; the latter is weakly increased by the imbalance. Spectral analysis indicated that the dynamics of the wake is also affected by the pitch imbalance since the tip vortices loose strength and disorganise more quickly than in the balanced case. The pitch imbalance has, however, a detrimental effect on the power coefficient and it affects the thrust coefficient as well. Only the blade affected by the imbalance shows significant modifications of the applied load, while the other blades operate with the same loading conditions.

Suggested Citation

  • Francesco Castellani & Abdelgalil Eltayesh & Matteo Becchetti & Antonio Segalini, 2021. "Aerodynamic Analysis of a Wind-Turbine Rotor Affected by Pitch Unbalance," Energies, MDPI, vol. 14(3), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:745-:d:490425
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    References listed on IDEAS

    as
    1. Abdelgalil Eltayesh & Magdy Bassily Hanna & Francesco Castellani & A.S. Huzayyin & Hesham M. El-Batsh & Massimiliano Burlando & Matteo Becchetti, 2019. "Effect of Wind Tunnel Blockage on the Performance of a Horizontal Axis Wind Turbine with Different Blade Number," Energies, MDPI, vol. 12(10), pages 1-15, May.
    2. Davide Astolfi & Francesco Castellani & Matteo Becchetti & Andrea Lombardi & Ludovico Terzi, 2020. "Wind Turbine Systematic Yaw Error: Operation Data Analysis Techniques for Detecting It and Assessing Its Performance Impact," Energies, MDPI, vol. 13(9), pages 1-17, May.
    3. Iñigo Aramendia & Unai Fernandez-Gamiz & Ekaitz Zulueta & Aitor Saenz-Aguirre & Daniel Teso-Fz-Betoño, 2019. "Parametric Study of a Gurney Flap Implementation in a DU91W(2)250 Airfoil," Energies, MDPI, vol. 12(2), pages 1-14, January.
    4. Fei-Bin Hsiao & Chi-Jeng Bai & Wen-Tong Chong, 2013. "The Performance Test of Three Different Horizontal Axis Wind Turbine (HAWT) Blade Shapes Using Experimental and Numerical Methods," Energies, MDPI, vol. 6(6), pages 1-20, June.
    5. Jing, Bo & Qian, Zheng & Pei, Yan & Zhang, Lizhong & Yang, Tingyi, 2020. "Improving wind turbine efficiency through detection and calibration of yaw misalignment," Renewable Energy, Elsevier, vol. 160(C), pages 1217-1227.
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    Cited by:

    1. Francesco Mazzeo & Derek Micheletto & Alessandro Talamelli & Antonio Segalini, 2022. "An Experimental Study on a Wind Turbine Rotor Affected by Pitch Imbalance," Energies, MDPI, vol. 15(22), pages 1-16, November.
    2. Xing, Zuoxia & Chen, Mingyang & Cui, Jia & Chen, Zhe & Xu, Jian, 2022. "Detection of magnitude and position of rotor aerodynamic imbalance of wind turbines using Convolutional Neural Network," Renewable Energy, Elsevier, vol. 197(C), pages 1020-1033.

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