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Article

Performance Improvement of a Straight-Bladed Darrieus Hydrokinetic Turbine through Enhanced Winglet Designs

1
Department of Mechanical Engineering, Universidad de los Andes, Bogotá 111711, Colombia
2
GITEM Group, Energetics & Mechanics Department, Faculty of Engineering, Universidad Autónoma de Occidente, Cali 760030, Colombia
3
PAI+ Group, Mechanical Engineering Department, Faculty of Engineering, Universidad Autónoma de Occidente, Cali 760030, Colombia
*
Authors to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2024, 12(6), 977; https://doi.org/10.3390/jmse12060977
Submission received: 8 May 2024 / Revised: 4 June 2024 / Accepted: 8 June 2024 / Published: 11 June 2024
(This article belongs to the Section Ocean Engineering)

Abstract

The global climate and energy crisis have underscored the importance of sustainability in energy systems and their efficiency. In the case of vertical axis turbines (VATs) for hydrokinetic applications, the increment in efficiency is a topic of interest. Using winglets as passive flow control devices has the potential to improve the power coefficient of straight-bladed (SB) Darrieus turbines highly due to their impact in the dynamics of the flow close to the tip blade and the general impact in the hydrodynamic performance of each blade. The aim of the present work is to study the influence of the geometric parameters of a symmetric winglet in the performance of an SB-VAT for hydrokinetic applications via numerical simulations based on Computational Fluid Dynamics (CFD). Several simulations were performed in Star CCM+ v2206 varying the cant and sweep angles of the designed winglet. Numerical results show that a cant angle of 45° in combination with a sweep angle of 60° achieved the highest power coefficient with an increment around 20% with respect to the model without winglets. Furthermore, the vortical flow structures that form around straight and winglet blades are examined. This involves assessing the distribution of pressure and skin friction coefficients at different blade azimuthal positions during a turbine revolution. In general, the predicted increment in performance is related to the influence of the winglets in the strength of the tip vortices and in the delay in the flow separation.
Keywords: hydrokinetic turbines; straight-bladed vertical axis turbine; symmetric winglet; CFD hydrokinetic turbines; straight-bladed vertical axis turbine; symmetric winglet; CFD

Share and Cite

MDPI and ACS Style

López, O.D.; Botero, N.; Nunez, E.E.; Laín, S. Performance Improvement of a Straight-Bladed Darrieus Hydrokinetic Turbine through Enhanced Winglet Designs. J. Mar. Sci. Eng. 2024, 12, 977. https://doi.org/10.3390/jmse12060977

AMA Style

López OD, Botero N, Nunez EE, Laín S. Performance Improvement of a Straight-Bladed Darrieus Hydrokinetic Turbine through Enhanced Winglet Designs. Journal of Marine Science and Engineering. 2024; 12(6):977. https://doi.org/10.3390/jmse12060977

Chicago/Turabian Style

López, Omar D., Nicolás Botero, Emerson Escobar Nunez, and Santiago Laín. 2024. "Performance Improvement of a Straight-Bladed Darrieus Hydrokinetic Turbine through Enhanced Winglet Designs" Journal of Marine Science and Engineering 12, no. 6: 977. https://doi.org/10.3390/jmse12060977

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