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Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine

Author

Listed:
  • Santiago Laín

    (Modelling, Analysis and Simulation of Environmental and Industrial Processes (PAI+) Research Group, Universidad Autónoma de Occidente, Calle 25 No 115-85, Cali, Colombia)

  • Manuel A. Taborda

    (Modelling, Analysis and Simulation of Environmental and Industrial Processes (PAI+) Research Group, Universidad Autónoma de Occidente, Calle 25 No 115-85, Cali, Colombia)

  • Omar D. López

    (Computational Mechanics Research Group, Universidad de los Andes, Carrera 1Este No 19A-40, Bogotá, Colombia)

Abstract

This study deals with the three-dimensional unsteady numerical simulation of the flow around a cross-flow vertical-axis water turbine (CFWT) of the Darrieus type. The influence of turbine design on its hydrodynamic characteristics and performance is investigated by means of a time-accurate Reynolds Averaged Navier Stokes (RANS) commercial solver. The flow unsteadiness is described using a transient rotor-stator model in connection with a sliding interface. A classical Darrieus straight blade turbine, based on the NACA0025 airfoil, has been modified adding winglets (symmetric and asymmetric designs) to the blades’ tips with the objective of reducing the strength of the detached trailing vortices. The turbulent features of the flow have been modelled by using different turbulence models ( k - ε Renormalization Group, standard Shear Stress Transport, transition Shear Stress Transport and Reynolds Stress Model). As a result, the predicted hydrodynamic performance of the turbine including winglets increases, independently of the employed turbulence model, being the improvement higher when a symmetric winglet design is considered. Moreover, visualization of skin friction lines pattern and their connection with vorticity isosurfaces, illustrating the flow detachment in the three blade configurations, has been carried out. Finally, a short discussion about the intermittency behavior along a turbine revolution is presented.

Suggested Citation

  • Santiago Laín & Manuel A. Taborda & Omar D. López, 2018. "Numerical Study of the Effect of Winglets on the Performance of a Straight Blade Darrieus Water Turbine," Energies, MDPI, vol. 11(2), pages 1-24, January.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:297-:d:129049
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    References listed on IDEAS

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    Cited by:

    1. Leidy Tatiana Contreras & Omar Dario Lopez & Santiago Lain, 2018. "Computational Fluid Dynamics Modelling and Simulation of an Inclined Horizontal Axis Hydrokinetic Turbine," Energies, MDPI, vol. 11(11), pages 1-23, November.
    2. Barbarić, Marina & Batistić, Ivan & Guzović, Zvonimir, 2022. "Numerical study of the flow field around hydrokinetic turbines with winglets on the blades," Renewable Energy, Elsevier, vol. 192(C), pages 692-704.
    3. Tunio, Intizar Ali & Shah, Madad Ali & Hussain, Tanweer & Harijan, Khanji & Mirjat, Nayyar Hussain & Memon, Abdul Hameed, 2020. "Investigation of duct augmented system effect on the overall performance of straight blade Darrieus hydrokinetic turbine," Renewable Energy, Elsevier, vol. 153(C), pages 143-154.
    4. Barnes, Andrew & Marshall-Cross, Daniel & Hughes, Ben Richard, 2021. "Towards a standard approach for future Vertical Axis Wind Turbine aerodynamics research and development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
    5. Santiago Laín & Pablo Cortés & Omar Darío López, 2020. "Numerical Simulation of the Flow around a Straight Blade Darrieus Water Turbine," Energies, MDPI, vol. 13(5), pages 1-27, March.
    6. Shern-Khai Ung & Wen-Tong Chong & Shabudin Mat & Jo-Han Ng & Yin-Hui Kok & Kok-Hoe Wong, 2022. "Investigation into the Aerodynamic Performance of a Vertical Axis Wind Turbine with Endplate Design," Energies, MDPI, vol. 15(19), pages 1-26, September.

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