Design and Optimization of a Multi-Element Hydrofoil for a Horizontal-Axis Hydrokinetic Turbine

Hydrokinetic turbines are devices that harness the power from moving water of rivers, canals, and artificial currents without the construction of a dam. The design optimization of the rotor is the most important stage to maximize the power production. The rotor is designed to convert the kinetic energy of the water current into mechanical rotation energy, which is subsequently converted into electrical energy by an electric generator. The rotor blades are critical components that have a large impact on the performance of the turbine. These elements are designed from traditional hydrodynamic profiles (hydrofoils), to directly interact with the water current. Operational e ectiveness of the hydrokinetic turbines depends on their performance, which is measured by using the ratio between the lift coe cient (CL) and the drag coe cient (CD) of the selected hydrofoil. High lift forces at low flow rates are required in the design of the blades; therefore, the use of multi-element hydrofoils is commonly regarded as an adequate solution to achieve this goal. In this study, 2D CFD simulations and multi-objective optimization methodology based on surrogate modelling were conducted to design an appropriate multi-element hydrofoil to be used in a horizontal-axis hydrokinetic turbine. The Eppler 420 hydrofoil was utilized for the design of the multi-element hydrofoil composed of a main element and a flap. The multi-element design selected as the optimal one had a gap of 2.825% of the chord length (C1), an overlap of 8.52 %C1, a flap deflection angle ( ) of 19.765 , a flap chord length (C2) of 42.471 %C1, and an angle of attack ( ) of –4 . Keywords: hydropower; optimization; renewable energy technologies

• Autores: Aguilar Bedoya, Jonathan; Rubio Clemente, Ainhoa; Velásquez García, Laura Isabel; Chica Arrieta, Edwin Lenin
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2019
• Institución: Tecnológico de Antioquia
• Repositorio: Repositorio Tdea
• Idioma: eng
• OAI Identifier: oai:dspace.tdea.edu.co:tdea/2808
• Acceso en línea: https://dspace.tdea.edu.co/handle/tdea/2808
• Palabra clave: Renewable energy; Energia renovável; Energía renovable; Hydropower; Renewable energy technologies; Hydroelectric power; Energía hidroeléctrica; Optimization; Optimización
• Rights: openAccess
• License: https://creativecommons.org/licenses/by/4.0/