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Experimental study of the wind turbine airfoil with the local flexibility at different locations for more energy output

Author

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  • Koca, Kemal
  • Genç, Mustafa Serdar
  • Bayır, Esra
  • Soğuksu, Fatma Kezban

Abstract

A passive flow control device with a local flexible membrane material over the suction surface was experimentally investigated with a smoke-wire experiment and time-dependent force measurement in this study. The experiments were performed on both the uncontrolled and the controlled FX 84-W-150 wind turbine airfoils applying the local flexible membrane at different locations first in the literature. The smoke-wire result for the uncontrolled airfoil indicated that a laminar separation bubble formed over the suction surface and the increasing incidence caused the short bubble at lower angles of attack to turn into the long bubble at moderate angles of attack by shifting upstream. After the experiment for the uncontrolled airfoil, six different locations of local flexibility were considered on the suction surface. All tests showed that applying the local flexibility especially at the leading edge ensured better aerodynamic performance. Additionally, it was observed that the lift coefficient was negatively affected when the length of local flexibility increased. As a result of these findings, employing the local flexibility between x/c = 0.2 and x/c = 0.4 over the suction surface was determined as the best optimum location and length. With employing this configuration, the laminar separation bubble was not only suppressed and eliminated but the fluctuations of the lift and the drag curves especially at moderate incidences were also decreased, resulting in increasing in aerodynamic performance as well as having less vibration and more stable on wind turbine airfoil. Apart from the studies regarding wind turbine airfoils with the local flexible material in the literature, our results bear witness that mounting this passive flow controller close to the leading edge and keeping it shorter was more influential in terms of the power output of wind turbine blades.

Suggested Citation

  • Koca, Kemal & Genç, Mustafa Serdar & Bayır, Esra & Soğuksu, Fatma Kezban, 2022. "Experimental study of the wind turbine airfoil with the local flexibility at different locations for more energy output," Energy, Elsevier, vol. 239(PA).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pa:s0360544221021356
    DOI: 10.1016/j.energy.2021.121887
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    References listed on IDEAS

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    1. Chamorro, Leonardo P. & Arndt, R.E.A. & Sotiropoulos, F., 2013. "Drag reduction of large wind turbine blades through riblets: Evaluation of riblet geometry and application strategies," Renewable Energy, Elsevier, vol. 50(C), pages 1095-1105.
    2. Koca, Kemal & Genç, Mustafa Serdar & Açıkel, Halil Hakan & Çağdaş, Mücahit & Bodur, Tuna Murat, 2018. "Identification of flow phenomena over NACA 4412 wind turbine airfoil at low Reynolds numbers and role of laminar separation bubble on flow evolution," Energy, Elsevier, vol. 144(C), pages 750-764.
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    8. Xin-Kai Li & Wei Liu & Ting-Jun Zhang & Pei-Ming Wang & Xiao-Dong Wang, 2019. "Experimental and Numerical Analysis of the Effect of Vortex Generator Installation Angle on Flow Separation Control," Energies, MDPI, vol. 12(23), pages 1-19, December.
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    1. Koca, Kemal & Genç, Mustafa Serdar & Ertürk, Sevde, 2022. "Impact of local flexible membrane on power efficiency stability at wind turbine blade," Renewable Energy, Elsevier, vol. 197(C), pages 1163-1173.
    2. Cihan Çiftci & Ayşe Erdoğan & Mustafa Serdar Genç, 2023. "Investigation of the Mechanical Behavior of a New Generation Wind Turbine Blade Technology," Energies, MDPI, vol. 16(4), pages 1-20, February.
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    4. Mustafa Özden & Mustafa Serdar Genç & Kemal Koca, 2023. "Passive Flow Control Application Using Single and Double Vortex Generator on S809 Wind Turbine Airfoil," Energies, MDPI, vol. 16(14), pages 1-17, July.

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