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Assessment of the dimples as passive boundary layer control technique for laminar airfoils operating at wind turbine blades root region typical Reynolds numbers

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  • D'Alessandro, Valerio
  • Clementi, Giacomo
  • Giammichele, Luca
  • Ricci, Renato

Abstract

In this work we consider dimples as a possible passive boundary layer control strategy in order to improve the wind turbine blades performance. Due to the complexity of the phenomenon, Large–Eddy Simulation (LES) is here used to analyze the flow field induced by dimples on the NACA 642–014A laminar airfoil operating at Re=1.75⋅105. We have selected a laminar airfoil since this kind of airfoils has been considered as successful solution for modern utility–scale wind turbines. Experimental measurements were also carried out at the Environmental Wind Tunnel of the “Università Politecnica delle Marche” for the sake of validation of our numerical investigations. LES results provided a good agreement with experimental data. It has been shown that dimples application can produce a reduction of the boundary layer separation; additionally, in all the considered cases, dimples reduce the pressure drag coefficient with a consequent increase of the viscous drag coefficient.

Suggested Citation

  • D'Alessandro, Valerio & Clementi, Giacomo & Giammichele, Luca & Ricci, Renato, 2019. "Assessment of the dimples as passive boundary layer control technique for laminar airfoils operating at wind turbine blades root region typical Reynolds numbers," Energy, Elsevier, vol. 170(C), pages 102-111.
    • Handle: RePEc:eee:energy:v:170:y:2019:i:c:p:102-111
    DOI: 10.1016/j.energy.2018.12.070
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    1. Bhavsar, Het & Roy, Sukanta & Niyas, Hakeem, 2023. "Aerodynamic performance enhancement of the DU99W405 airfoil for horizontal axis wind turbines using slotted airfoil configuration," Energy, Elsevier, vol. 263(PA).
    2. Sedighi, Hamed & Akbarzadeh, Pooria & Salavatipour, Ali, 2020. "Aerodynamic performance enhancement of horizontal axis wind turbines by dimples on blades: Numerical investigation," Energy, Elsevier, vol. 195(C).
    3. S. Arunvinthan & V.S. Raatan & S. Nadaraja Pillai & Amjad A. Pasha & M. M. Rahman & Khalid A. Juhany, 2021. "Aerodynamic Characteristics of Shark Scale-Based Vortex Generators upon Symmetrical Airfoil," Energies, MDPI, vol. 14(7), pages 1-22, March.
    4. Cui, Wenyao & Xiao, Zhixiang & Yuan, Xiangjiang, 2020. "Simulations of transition and separation past a wind-turbine airfoil near stall," Energy, Elsevier, vol. 205(C).
    5. Azlan, F. & Tan, M.K. & Tan, B.T. & Ismadi, M.-Z., 2023. "Passive flow-field control using dimples for performance enhancement of horizontal axis wind turbine," Energy, Elsevier, vol. 271(C).
    6. Nakhchi, M.E. & Naung, S. Win & Rahmati, M., 2022. "Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation," Energy, Elsevier, vol. 242(C).
    7. Moussavi, S. Abolfazl & Ghaznavi, Aidin, 2021. "Effect of boundary layer suction on performance of a 2 MW wind turbine," Energy, Elsevier, vol. 232(C).
    8. Nakhchi, M.E. & Naung, S. Win & Dala, L. & Rahmati, M., 2022. "Direct numerical simulations of aerodynamic performance of wind turbine aerofoil by considering the blades active vibrations," Renewable Energy, Elsevier, vol. 191(C), pages 669-684.
    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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