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- Title
Numerical Modelling and Characterisation of Hydrofoils for the Hybrid of Savonius and Darrieus Hydrokinetic Turbine.
- Authors
Oyewola, Olanrewaju M.; Aogo, Olajide A.; Ajide, Olusegun O.
- Abstract
The development of Hydrokinetic Turbines (HKTs) to harness energy from low-head water resources requires an in-depth understanding of the interactions between its hydrofoils and the fluid flow. However, the available HKTs are made up of blades or hydrofoils with complex geometries that are difficult and expensive to produce in developing countries like Nigeria and Fiji. Hence, there is a need to develop hydrofoils with simple geometries. This work was designed to investigate the development of hydrofoils with simple geometries and evaluates the performance characteristics using numerical simulations. Numerical models were developed by solving continuity, Navier-Stokes and k-ε turbulence equations for seven hydrofoil geometries. The result shows that the maximum Power coefficient CP and efficiency occur at Tip Speed Ratio (TSR) of 4 which correspond to angle of attack ranges from 0° to 10° depending on the hydrofoils. While the wavelength and oscillation of the lift-drag coefficient ratio (CL/CD) profiles is similar to some degree, the peak of CL/CD occurs at different angle of attack for all the hydrofoils. The Cp of 0.48 at TSR of 4 was observed for NACA0021 hydrofoil. The symmetric NACA0021 at angle of attack of 0° was selected as the most appropriate of all the seven hydrofoils considered in this study due to its performance and simplicity of its geometry.
- Subjects
FIJI; NIGERIA; HYDROFOILS; TURBINES; FLUID flow; WATER supply; DEVELOPING countries
- Publication
International Review of Mechanical Engineering, 2022, Vol 16, Issue 7, p345
- ISSN
1970-8734
- Publication type
Article
- DOI
10.15866/ireme.v16i7.22594