Aerodynamic Performance of VAWT Airfoils: Comparison between Wind Tunnel Testing Using a New Three-Component Strain Gauge Balance and CFD Modelling

  1. Santamaría, Luis 1
  2. Galdo Vega, Mónica 1
  3. Pandal, Adrián 1
  4. González Pérez, José 1
  5. Velarde-Suárez, Sandra 1
  6. Fernández Oro, Jesús Manuel 1
  1. 1 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

Revista:
Energies

ISSN: 1996-1073

Año de publicación: 2022

Volumen: 15

Número: 24

Páginas: 9351

Tipo: Artículo

DOI: 10.3390/EN15249351 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Energies

Objetivos de desarrollo sostenible

Resumen

Vertical axis wind turbines are an emerging and in-development wind energy technologywhich are characterized by their complicated aerodynamics. Detached flow conditions, whichare typically developed at operational tip speed ratios, demand a rigorous characterization of theairfoils for an accurate prediction of the turbine performance. In this work, a custom-built, threecomponent external strain gauge balance, specifically developed for airfoil testing, is validated. Thephysical reasons responsible for discrepancies with reference data are also analyzed. Two- andthree-dimensional flat plates, as well as the DU06-W-200 airfoil, are tested in a wind tunnel. Lift anddrag coefficients and pitching moments are obtained for a wide angular range at Re = 200,000. Theresults are compared with data from the bibliography and CFD simulations, performed with therecently developed GEKO (generalized k-omega) turbulence model, achieving remarkable agreement.Instantaneous forces are also analyzed with both experimental and CFD techniques, providing interesting results of the unsteady fluid dynamics. Finally, critical factors affecting the measurements are identified and enhancements are proposed for future works. In summary, a thorough evaluation of this new balance design is provided, showing its valuable potential for VAWT applications.

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