Towing Tank Measurements Of Hydrodynamic Performance Of A Horizontal Axis Tidal Turbine Under Unsteady Flow Conditions
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| Author | : Max Cullen Van Benthem |
| Publisher | : |
| Total Pages | : 47 |
| Release | : 2013 |
| Genre | : Renewable energy sources |
| ISBN | : |
Tidal turbines harness hydrokinetic energy resulting from ocean tidal flows to generate power. This type of power generation is a potential source of clean, reliable renewable energy. However, the technology is still under development. The effects of unsteady flow conditions, specifically surface gravity waves, on tidal turbines have not been completely analyzed. The effects of waves on performance characteristics were assessed for a model horizontal axis tidal turbine selected by the Department of Energy and designed by the National Renewable Energy Laboratory (NREL). The performance characteristics of the 1/25th scale model turbine were tested under unsteady flow conditions. Parameters including wave height, wave length and tow speed for the experiment were scaled to properly model flow conditions that a horizontal axis tidal turbine was expected to experience at a full scale. First, turbine rotational speed, torque and thrust were measured for steady flow conditions and unsteady flow conditions characterized by a range of incoming waves. Turbine performance characteristics, including thrust and power coefficients, were obtained as functions of rotor tip speed ratio for the unsteady flow conditions tested. The second experiment involved a detailed fluid flow survey in the near wake of the turbine with and without one of the waves utilized in the first experiment, as measured by Acoustic Doppler Velocimeters. The results provided a characterization of velocity fields in the near wake of the turbine, necessary information for the placement of multiple turbines in a larger array.
| Author | : Binoe Abuan |
| Publisher | : |
| Total Pages | : |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
| Author | : Esteban Ferrer |
| Publisher | : Springer |
| Total Pages | : 134 |
| Release | : 2015-06-09 |
| Genre | : Technology & Engineering |
| ISBN | : 3319162020 |
The book encompasses novel CFD techniques to compute offshore wind and tidal applications. Computational fluid dynamics (CFD) techniques are regarded as the main design tool to explore the new engineering challenges presented by offshore wind and tidal turbines for energy generation. The difficulty and costs of undertaking experimental tests in offshore environments have increased the interest in the field of CFD which is used to design appropriate turbines and blades, understand fluid flow physical phenomena associated with offshore environments, predict power production or characterise offshore environments, amongst other topics.
| Author | : Sverre Steen |
| Publisher | : MDPI |
| Total Pages | : 355 |
| Release | : 2018-10-10 |
| Genre | : Technology & Engineering |
| ISBN | : 3038972029 |
This book is a printed edition of the Special Issue "Marine Propulsors" that was published in JMSE
| Author | : C. Guedes Soares |
| Publisher | : CRC Press |
| Total Pages | : 1030 |
| Release | : 2015-09-07 |
| Genre | : Technology & Engineering |
| ISBN | : 1315647850 |
Renewable Energies Offshore includes the papers presented in the 1st International Conference on Renewable Energies Offshore (RENEW2014), held in Lisbon, 24-26 November 2014. The conference is a consequence of the importance of the offshore renewable energies worldwide and an opportunity to contribute to the exchange of information on the dev
| Author | : Vallampati Ramachandra Prasad |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 264 |
| Release | : 2023-02-22 |
| Genre | : Technology & Engineering |
| ISBN | : 1803562188 |
This book provides a comprehensive overview of boundary layer flows, including laminar and turbulent flows. Chapters discuss such topics as the nature of transition, the effect of two-dimensional and isolated roughness on laminar flow, and progress in the design of low-drag airfoils. They also present theoretical and experimental results in boundary layer flows and discuss directions for future research.
| Author | : Benjamin H. Bailin |
| Publisher | : |
| Total Pages | : 31 |
| Release | : 2017 |
| Genre | : Surface waves (Oceanography) |
| ISBN | : |
Hydrokinetic turbines convert the energy of flowing water into usable electricity. Axial flow and cross flow turbines are the most common forms of hydroNinetic turbine, however cross flow turbine performance and the impact of surface waves are not well understood. Tests were conducted to observe the effects of waves on the performance characteristics of a cross flow turbine promulgated by the Department of Energy’s Reference Model Project, specifically Reference Model 2. Testing of a 1:6 scale model was conducted in the large towing tank in the USNA Hydromechanics Laboratory. Baseline (no wave) turbine performance was compared to published data on the same model turbine. Additionally, tests were conducted with incident waves and at various turbine depths and various tow speeds. The average turbine performance characteristics improved slightly as depth decreased due to acceleration of the constricted flow near the surface. Waves did not significantly change the performance of the turbine when averaged over of an entire cycle and several wave periods. This was the case even though the test waves created a velocity shear across the entire span of the blade. The waves were found to impart cyclic signatures in the torque measurement which may have consequences for instantaneous blade loading and power output from the device. A computational model was developed to predict turbine performance and compares favorably to the experiment.
| Author | : Bao Ngoc Ha Tran |
| Publisher | : |
| Total Pages | : 358 |
| Release | : 2017 |
| Genre | : Hydraulic turbines |
| ISBN | : |
| Author | : Martin O. L. Hansen |
| Publisher | : Routledge |
| Total Pages | : 192 |
| Release | : 2013-05-13 |
| Genre | : Technology & Engineering |
| ISBN | : 1136572260 |
Aerodynamics of Wind Turbines is the established essential text for the fundamental solutions to efficient wind turbine design. Now in its second edition, it has been entirely updated and substantially extended to reflect advances in technology, research into rotor aerodynamics and the structural response of the wind turbine structure. Topics covered include increasing mass flow through the turbine, performance at low and high wind speeds, assessment of the extreme conditions under which the turbine will perform and the theory for calculating the lifetime of the turbine. The classical Blade Element Momentum method is also covered, as are eigenmodes and the dynamic behaviour of a turbine. The new material includes a description of the effects of the dynamics and how this can be modelled in an ?aeroelastic code?, which is widely used in the design and verification of modern wind turbines. Further, the description of how to calculate the vibration of the whole construction, as well as the time varying loads, has been substantially updated.
| Author | : Tayfun E. Tezduyar |
| Publisher | : Springer Nature |
| Total Pages | : 580 |
| Release | : 2023-11-01 |
| Genre | : Mathematics |
| ISBN | : 3031369424 |
Computational fluid-structure interaction (FSI) and flow simulation are challenging research areas that bring solution and analysis to many classes of problems in science, engineering, and technology. Young investigators under the age of 40 are conducting much of the frontier research in these areas, some of which is highlighted in this volume. The first author of each chapter took the lead role in carrying out the research presented. Some of the topics explored include Direct flow simulation of objects represented by point clouds Computational investigation of leaflet flutter in thinner biological heart valve tissues High-fidelity simulation of hydrokinetic energy applications High-resolution isogeometric analysis of car and tire aerodynamics Computational analysis of air-blast-structure interaction Heart valve computational flow analysis with boundary layer and leaflet contact representation Computational thermal multi-phase flow for metal additive manufacturing This volume will be a valuable resource for early-career researchers and students — not only those interested in computational FSI and flow simulation, but also other fields of engineering and science, including fluid mechanics, solid mechanics, and computational mathematics – as it will provide them with inspiration and guidance for conducting their own successful research. It will also be of interest to senior researchers looking to learn more about successful research led by those under 40 and possibly offer collaboration to these researchers.
