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Control of laminar separation bubble over wind turbine airfoil using partial flexibility on suction surface

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  • Açıkel, Halil Hakan
  • Serdar Genç, Mustafa

Abstract

In order to suppress the laminar separation bubble and its negative effects on airfoil at low Reynolds numbers, a partially flexible membrane was utilized on the suction surface of a NACA4412 wind turbine airfoil. Location of the partially flexible membrane was decided between x/c = 0.2 and x/c = 0.7 according to experimental results. This partially flexible airfoil was tested using various experimental methods at Re = 2.5 × 104, Re = 5 × 104, Re = 7.5 × 104. Utilizing the partially flexible membrane over the suction surface of the airfoil enabled the bubble to be mitigated or suppressed, therefore the aerodynamic performance improved with lift enhancement and drag reduction. The values of turbulence kinetic energy and Reynolds stress decreased with the partial flexibility, as a result of reducing fluctuations in the flow. With the interaction of the partially flexible membrane and the bubble; the vortices due to the bubble caused the membrane to deform and vibrate. Vibration mode numbers of the membrane deformation were high at lower incidences due to the small vortices, whilst the mode numbers were reduced at higher incidences in the presence of growing vortices. Meanwhile, the membrane caused the vortices to damp down. However, it was observed that the effectiveness of the membrane was decreased when Reynolds number increased.

Suggested Citation

  • Açıkel, Halil Hakan & Serdar Genç, Mustafa, 2018. "Control of laminar separation bubble over wind turbine airfoil using partial flexibility on suction surface," Energy, Elsevier, vol. 165(PA), pages 176-190.
    • Handle: RePEc:eee:energy:v:165:y:2018:i:pa:p:176-190
    DOI: 10.1016/j.energy.2018.09.040
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    References listed on IDEAS

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    1. 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.
    2. Wang, Haipeng & Zhang, Bo & Qiu, Qinggang & Xu, Xiang, 2017. "Flow control on the NREL S809 wind turbine airfoil using vortex generators," Energy, Elsevier, vol. 118(C), pages 1210-1221.
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    6. 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).
    7. Fan, Menghao & Sun, Zhaocheng & Dong, Xiangwei & Li, Zengliang, 2022. "Numerical and experimental investigation of bionic airfoils with leading-edge tubercles at a low-Re in considering stall delay," Renewable Energy, Elsevier, vol. 200(C), pages 154-168.
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    9. Nakhchi, M.E. & Naung, S. Win & Rahmati, M., 2021. "High-resolution direct numerical simulations of flow structure and aerodynamic performance of wind turbine airfoil at wide range of Reynolds numbers," Energy, Elsevier, vol. 225(C).

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