Session: 09-03-01 Tidal Energy: Design and Innovation

Paper Number: 120812

120812 - The Effect of Extra Mass Moment of Inertia on S-Shaped Vertical Axis Autorotation Current Turbine (Vaact) 

This paper investigates the influence of extra mass moment of inertia on the performance of S-Shaped Vertical Axis Autorotation Current Turbine (VAACT). Tests have been carried out at Laboratory of Waves and Currents (LOC-COPPE/UFRJ) to rise up the efficiency curves of this geometry. The test facility presents 22 m of length, 1.4 m of width and 0.5 m of water depth, leading to a blockage ratio of 21%. The experiments are performed varying the moment of inertia from 0.0135 kg.m² to 3.0 kg.m² at Reynolds regimes from 30,000 up to 135,000. The power output is estimated by weight lifting approach in which the power is given by the time derivative of weight’s potential energy. The investigation gives the additional mass moment of inertia in this device can lead to a performance improvement about 60% on turbine’s power harvesting. Furthermore, the tests do provide the increase in mass moment of inertia is strictly related to better performances as it may increase the torque of VAACT turbine and make it to operate at the design tip speed ratio. The analysis shows the turbine can obtain 24% of efficiency operating at tip speed ratio of 1.5 and Reynolds number of 90,000. The turbine seems to have poor behaviour at larger Reynolds number due to high vortex-shedding noticed at the wake.

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

Presenting Author Biography: Full 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) em 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 also has works on VIM (Vortex Induced Motion) and System Dynamics Dimensional Analysis. In summary, broad experience on projects targeting practical applications guided by Science and Technology.

Authors:

Rodrigo Batista 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