Examinando por Autor "Oria Escudero, J."

Mostrando 1 - 3 de 3

Acceso Abierto
Hidrodinámica de elementos de amortiguamiento del movimiento vertical de plataformas eólicas flotantes
(Asociación de Ingenieros Navales y Oceánicos de España, 2021-10-21) Saavedra Ynocente, Leandro; Molinelli Fernández, E.; Soriano Gómez, C.; Bezunartea Barrio, A.; Oria Escudero, J.; Marón Loureiro, Adolfo
"Within the framework of collaborative projects of the National Research Program, INTA - CEHIPAR and CEHINAV (UPM) are carrying out a project on the hydrodynamic analysis of damping mechanisms of vertical motions (heave) in floating offshore wind turbines (FOWT) in which scale effects are evaluated of the hydrodynamic phenomena in order to increase damping, added mass and at the same time contributing to the structural resistance of the platform. The evaluation of the scale effects has been carried out through experimental tests at three different scales in a simplified model and at three different frequencies and amplitudes. It was verified with the analysis of the experimental tests that there are no significant scale effects, therefore the next phases are only carried out with a single model scale, the one with the largest scale. The increase in damping for this type of floating offshore wind turbines has been evaluated through different solutions. They were chosen based on numerical calculations by adding several disc setups at the bottom of one of the platform legs, in four different configurations: single disc, double discs of equal size and double unequal discs in two configurations. In these tests, the non-intrusive experimental technique of particle image velocimetry (PIV) and forces measurement on the cylinder in forced oscillations through of a vertical actuator has been used."
Restringido
Scale Effects in Heave Plates: PIV Investigation
(ASME, 2020) Anglada Revenga, E.; Bezunartea Barrio, A.; Marón Loureiro, Adolfo; Molinelli Fernández, E.; Oria Escudero, J.; Saavedra Ynocente, Leandro; Soriano Gómez, C.; Duque Campayo, D.; Gómez Goni, J.; Souto Iglesias, A.
Bezunartea et al. Scale Effects on Heave Plates for Semi-Submersible Floating Offshore Wind Turbines: Case Study With a Solid Plain Plate (Journal of Offshore Mechanics and Arctic Engineering, Vol. 11, pp 1–14, 2019) studied scale effects on the hydrodynamics of heave plates by conducting model scale experimental tests. Three models with different scales of one leg of the HiPRWind platform, equipped with a plain heave plate, were built and tested with forced harmonic heave motions. They showed that the influence of the model scale on the coefficients is clearly weaker than that of the heave motion amplitude. Among the pending tasks in that work was to conduct velocity field measurements of the flow with Particle Image Velocimetry techniques (PIV). This paper discusses some of the results of such measurements, carried out forcing vertical harmonic motions. In these measurements, it is assessed how significant scale effects are also in the local kinematics of the flow, thus complementing the global ones carried out in the referred work. From velocity and vorticity graphs, the flows show great similarities across the three scales, consistent with the ones found in the prequel paper. A metric has been developed whose outcomes are aligned with these results but further work is necessary to develop key indicators to compare flow fields from PIV across different scales.
Restringido
Scale Effects on Heave Plates for Semi-Submersible Floating Offshore Wind Turbines: Case Study With a Solid Plain Pla
(ASME, 2019-01-28) Bezunartea Barrio, A.; Fernández Ruano, S.; Marón Loureiro, Adolfo; Molinelli Fernández, E.; Moreno Burón, F.; Oria Escudero, J.; Ríos Tubio, J.; Soriano Gómez, C.; López Pavón, C.; Souto Iglesias, A.; Valea Peces, Álvaro
In the case of SPAR or semi-submersible platforms for floating wind turbines, it is beneficial in some cases to use heave plates that reduce their heave motion amplitude and/or tune their heave natural period. As part of the Hiprwind project, it was decided to study scale effects on the hydrodynamics of this element. To this aim, models of one leg of the platform, equipped with a heave plate without any reinforcements, were built. This model is a simplified representation of the actual one, which incorporates a vertical flap on the heave plate edge. The scales were 1:20, 1:27.6, and 1:45.45, with the former leading to added mass values of the order of 300 kg, becoming one of the largest models for which experiments with heave oscillations have been carried out. Decay tests starting from various amplitudes and forced oscillations tests for a range of frequencies and amplitudes were performed. It is shown in the paper that the influence of the scale factor on the hydrodynamic coefficients is weaker than the effect that the motion amplitude (characterized with the Keulegan–Carpenter (KC) number produces in them. This result is relevant because the selection of a representative KC is an important and somewhat arbitrary aspect to be set in the linear potential simulation codes in order to add viscous damping. What has been shown herein is that a right selection of KC has a larger impact on the models than the uncertainties due to eventual scale effects in the heave-plates dynamics.