Session: 09-03-02: Current and Tidal Energy: Hydrodynamic Analysis

Paper Number: 100991

100991 - The Effect of Power Take-Off System on S-Shaped Vertical Axis Autorotation Current Turbine 

This paper investigates the S-Shaped Vertical Axis Autorotation Current Turbine (VAACT) through experiments at the current flume from Laboratory of Waves and Currents (LOC-COPPE/UFRJ). The tests aim to obtain the efficiency curves of the geometry varying the following parameters: Reynolds number, power take-off (PTO) system, aspect ratio and tip speed ratio. The S-Shaped rotor is determined by Chan et al. (2018) integrating genetic algorithm optimization to a bidimensional numerical model made in ANSYS/Fluent. Here, the optimized blade is made in 3D printer machine and subject to five different Reynolds number, four aspect ratios and seven PTO contributions. The power take-off system is based on lifting masses as explained in Fernandes & Rostami (2015) where the power extracted is the time derivative of potential energy. The study shows the efficiency marginally changes with aspect ratio as this is a two-dimensional investigation. Moreover, the experiment provides the turbine efficiency is very sensitive to PTO configuration because it can significantly vary with that parameter. An uncertainty analysis has been carried out where that allows to realize the data into a given experimental assembly not only behaves following up normal distribution but also have good repeatability. The maximum efficiency is about 14% and has been achieved at Reynolds number of 75,000, tip speed ratio of 1.44, aspect ratio of 1.5 and dimensionless Power Take-Off mass of 0.48.

Presenting Author: Antonio Carlos Fernandes Federal University of Rio de Janeiro

Presenting Author Biography: Professor Antonio Carlos Fernandes has academic titles from the Escola Politécnica da Universidade de São Paulo (USP), from the Massachusetts Institute of Technology (MIT) and from the Universidade Federal do Rio de Janeiro (UFRJ). At USP he achieved two titles: one undergraduate (Naval Architecture, Marine and Ocean Engineering) in 1972 and a Master (MSc) in the same topic in 1977. At MIT two title were also achieved: Ocean Engineer (intermediate title between MSc e PhD) de 1982 and the own PhD also in Ocean Engineering in 1984. As a last title, as Full Professor, has been achieved in COPPE/UFRJ (Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia from UFRJ) in 2016. The Professor acted two mandates as Coordinator of PEnO and he is Founder Coordinator of the Laboratory of Currents and waves (LOC - Laboratório de Ondas e Correntes). He participated in the foundation and is Director of LabOceano (deepwater ocean basin). He is member of the Executive committee of ITTC (International Towing Tank Conference) as Americas (North and South) representative since 2005 and, since 2002, Member of the Ocean engineering Committee. He was member of the OOAE (Offshore, Ocean and Arctic Division) of ASME (American Society of Mechanical Engineers) from 2013 to 2020, attended OMAEs all OMAE (Offshore Mechanics and Arctic Engineering) since 1996, and presently is Co-coordinator of the Ocean Engineering Symposium (Symposium 6). The Professor has experience in the Area of Naval Architecture and Ocean Engineering with emphasis in Hydrodynamic and Dynamic of Ocean Systems. Some subject already developed: Experimental, Numerical and Analytical Methods, Torpedo Pile Anchor Installation, Pendular Installation Method of Heavy Devices on the Ocean Bottom, Slamming, Mooring Line Failure, Renewable Energies from Waves, Currents and Wind, Hydrodynamics of the Floating Bodies in waves, FPSO Behavior including Directional Stability in Current, Advanced research on Roll of Vessels and Platforms with and without bilge keels, VIV (Vortices Induced Vibration), VIVx, VIVy, VIVxy, VSIV, Reynolds Number Effect on VIV. He has works on VIM (Vortex Induced Motions), System Dynamics and Dimensional Analysis. In summary, broad experience on projects targeting practical applications guided by Science and Technology.

Authors:

Rodrigo Soares Federal University of Rio de Janeiro
Antonio Carlos Fernandes Federal University of Rio de Janeiro
Joel Sena Sales Junior Federal University of Rio de Janeiro