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Computational Modelling of Three Different Sub-Boundary Layer Vortex Generators on a Flat Plate

Author

Listed:
  • Ruben Gutierrez-Amo

    (Nuclear Engineering and Fluid Mechanics Department, University of the Basque Country, Nieves Cano 12, 01006 Vitoria-Gasteiz, Araba, Spain)

  • Unai Fernandez-Gamiz

    (Nuclear Engineering and Fluid Mechanics Department, University of the Basque Country, Nieves Cano 12, 01006 Vitoria-Gasteiz, Araba, Spain)

  • Iñigo Errasti

    (Nuclear Engineering and Fluid Mechanics Department, University of the Basque Country, Nieves Cano 12, 01006 Vitoria-Gasteiz, Araba, Spain)

  • Ekaitz Zulueta

    (Automatic control and System Engineering Department, University of the Basque Country, Nieves Cano 12, 01006 Vitoria-Gasteiz, Araba, Spain)

Abstract

Flow separation is the source of several problems in a wind turbine including load fluctuations, lift losses, and vibrations. Vortex generators (VGs) are passive flow control devices used to delay flow separation, but their implementation may produce overload drag at the blade section where they are placed. In the current work, a computational model of different geometries of vortex generators placed on a flat plate has been carried out throughout fully meshed computational simulations using Reynolds Averaged Navier-Stokes (RANS) equations performed at a Reynolds number of R e θ = 2600 based on local boundary layer (BL) momentum thickness θ = 2.4 mm. A flow characterization of the wake behind the vortex generator has been done with the aim of evaluating the performance of three vortex generator geometries, namely Rectangular VG, Triangular VG, and Symmetrical VG NACA0012. The location of the primary vortex has been evaluated by the vertical and lateral trajectories and it has been found that for all analyzed VG geometries the primary vortex is developed below the boundary layer thickness δ = 20 mm for a similar vorticity level ( w x m a x ). Two innovative parameters have been developed in the present work for evaluating the vortex size and the vortex strength: Half-Life Surface S 05 and Mean Positive Circulation Γ 05 + . As a result, an assessment of the VG performance has been carried out by all analyzed parameters and the symmetrical vortex generator NACA0012 has provided good efficiency in energy transfer compared with the Rectangular VG.

Suggested Citation

  • Ruben Gutierrez-Amo & Unai Fernandez-Gamiz & Iñigo Errasti & Ekaitz Zulueta, 2018. "Computational Modelling of Three Different Sub-Boundary Layer Vortex Generators on a Flat Plate," Energies, MDPI, vol. 11(11), pages 1-21, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:11:p:3107-:d:181927
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    References listed on IDEAS

    as
    1. Lei Chai & Savvas A. Tassou, 2018. "A Review of Airside Heat Transfer Augmentation with Vortex Generators on Heat Transfer Surface," Energies, MDPI, vol. 11(10), pages 1-45, October.
    2. Unai Fernandez-Gamiz & Ekaitz Zulueta & Ana Boyano & Igor Ansoategui & Irantzu Uriarte, 2017. "Five Megawatt Wind Turbine Power Output Improvements by Passive Flow Control Devices," Energies, MDPI, vol. 10(6), pages 1-15, May.
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    Cited by:

    1. Iñigo Errasti & Unai Fernández-Gamiz & Pablo Martínez-Filgueira & Jesús María Blanco, 2019. "Source Term Modelling of Vane-Type Vortex Generators under Adverse Pressure Gradient in OpenFOAM," Energies, MDPI, vol. 12(4), pages 1-21, February.
    2. Alejandro Ballesteros-Coll & Unai Fernandez-Gamiz & Iñigo Aramendia & Ekaitz Zulueta & Jose Manuel Lopez-Guede, 2020. "Computational Methods for Modelling and Optimization of Flow Control Devices," Energies, MDPI, vol. 13(14), pages 1-15, July.
    3. Davide Astolfi & Francesco Castellani, 2019. "Wind Turbine Power Curve Upgrades: Part II," Energies, MDPI, vol. 12(8), pages 1-20, April.

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