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Trailing-edge serrations effect on the performance of a wind turbine

Author

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  • Llorente, Elena
  • Ragni, Daniele

Abstract

An experimental study focusing on the change of the aerodynamic performance of a wind turbine with the employment of trailing-edge serrations is presented. The design procedure which starts from the serration design, together with the experimental wind tunnel testing and the installation in an already operating wind turbine is discussed. A prediction methodology to estimate the aerodynamic performance change of the machine with the blade add-on is validated by in-field measurements. Wind tunnel experiments for the validation of the original serration design have been carried out on a Nordex ADO30 airfoil with a relative thickness of 30% and on a NACA643418 airfoil with 18% thickness. The two airfoils are respectively used in this study due to their peculiar characteristics. While the first has been designed for relatively high Cl/Cd performance versus structural integrity (i.e. relatively high thickness), the second one is a typical reference airfoil used in wind turbines for its interesting Cl/Cd performance in both laminar and rough conditions. Clean and rough conditions have been tested in order to prepare a database for the analysis of the full turbine in several wind conditions. Aerodynamic forces with the serrated trailing-edge extensions are measured for different angles of attack and serration flap angles. The results are further discussed and employed for the analysis of the full rotor. Results already show that an increase in the flap angle is typically associated with an increment in lift, but not necessarily in drag. This has a beneficial effect on the operational regime of the machine when taken into account. The influence of the trailing-edge serrations on an operating wind turbine has been quantified in terms of total loads and energy production. The power curves with and without the trailing-edge installations are further analyzed and compared with the theoretical predictions.

Suggested Citation

  • Llorente, Elena & Ragni, Daniele, 2020. "Trailing-edge serrations effect on the performance of a wind turbine," Renewable Energy, Elsevier, vol. 147(P1), pages 437-446.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:437-446
    DOI: 10.1016/j.renene.2019.08.128
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    Cited by:

    1. Khaoula Qaissi & Omer Elsayed & Mustapha Faqir & Elhachmi Essadiqi, 2023. "Aerodynamic Optimization of Trailing-Edge-Serrations for a Wind Turbine Blade Using Taguchi Modified Additive Model," Energies, MDPI, vol. 16(3), pages 1-21, January.
    2. Tingrui Liu & Ailing Gong & Changle Song & Yuehua Wang, 2020. "Sliding Mode Control of Active Trailing-Edge Flap Based on Adaptive Reaching Law and Minimum Parameter Learning of Neural Networks," Energies, MDPI, vol. 13(5), pages 1-21, February.
    3. Hoen, Ben & Darlow, Ryan & Haac, Ryan & Rand, Joseph & Kaliski, Ken, 2023. "Effects of land-based wind turbine upsizing on community sound levels and power and energy density," Applied Energy, Elsevier, vol. 338(C).
    4. Zhou, Teng & Cao, Huijing & Zhang, Mingming & Liao, Caicai, 2022. "Performance simulation of wind turbine with optimal designed trailing-edge serrations," Energy, Elsevier, vol. 243(C).

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