Experimental And Numerical Study Of A Vertical Axis Tidal Turbine Performance
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Experimental And Numerical Study Of A Vertical Axis Tidal Turbine Performance
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Author :
language : en
Publisher:
Release Date : 2017
Experimental And Numerical Study Of A Vertical Axis Tidal Turbine Performance written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Experimental Studies Of A Small Scale Horizontal Axis Tidal Turbine
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Author : Italo Franchini
language : en
Publisher:
Release Date : 2016
Experimental Studies Of A Small Scale Horizontal Axis Tidal Turbine written by Italo Franchini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The research in this thesis focuses on the investigation of tidal turbines using a small scale horizontal axis tidal turbine and a 2D hydrofoil testing rig, combining experiments with simulations to provide comprehensive results and to better understand some of the variables that affect their performance. The experimental campaigns were carried out at the University of Victoria fluids research lab and the Sustainable Systems Design Lab (SSDL). The experimental testing rigs were re-designed by the author and are now fully automated, including a friendly graphical user interface for easy implementation. Particle image velocimetry (PIV) technique was used as the quantitative flow visualization method to obtain the time-averaged flow fields. This thesis presents three investigations. The first study aims to quantify the impacts of channel blockage, free surface effects and foundations on hydrokinetic turbine performance, using porous discs and an axial flow rotor. The results were used to cross-validate computational fluid dynamics (CFD) simulations. It was found that as wall blockage increases, thrust and power are incremented with and without the inclusion of free surface deformation. Discrepancies between simulations and experimental results on free surface effects compared to a slip wall were obtained and hence further research is recommended and the author gives some advice on how to proceed in this investigation.The second study determines the performance of four hydrofoil candidates over a range of low Reynolds number (Re), delivering useful information that can be applied to low Re energy conversion systems and, specifically in this case, to improve the performance of the small scale tidal turbine at the SSDL lab. The study combines the 2D hydrofoil test rig along with PIV measurements in order to experimentally obtain lift and drag coefficients. The experiments were carried out in the recirculating flume tank over the range of low Re expected for the small scale rotor rig, in order to provide more accurate results to improve rotor blade design. In addition, numerical simulations using XFOIL, a viscid-inviscid coupled method, were introduced to the study. These results were analysed against experiments to find the most suitable parameters for reliable performance prediction. The final results suggested that adding a numerical trip at a certain chordwise distance produced more reliable results.Finally, an experimental study on turbine rotor performance and tip vortex behavior was performed using again the rotor rig and PIV. Blade design and rotor performance were assessed, showing good agreement with Blade Element Momentum (BEM) simulations, particularly at predicting the tip speed ratio corresponding to the maximum power coefficient point. Regarding the wake structure, tip vortex locations (shed from the blade tips) were captured using PIV in the near wake region, showing evidence of wake expansion. The velocity and vorticity fields are also provided to contribute to the development and validation of CFD and potential flow codes.
Numerical Study Of The Duct Shape Effect On The Performance Of A Ducted Vertical Axis Tidal Turbine
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Author : Yasser Nabavi
language : en
Publisher:
Release Date : 2008
Numerical Study Of The Duct Shape Effect On The Performance Of A Ducted Vertical Axis Tidal Turbine written by Yasser Nabavi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Vertical Axis Hydrokinetic Turbines Numerical And Experimental Analyses
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Author : Mabrouk Mosbahi
language : en
Publisher: Bentham Science Publishers
Release Date : 2021-12-14
Vertical Axis Hydrokinetic Turbines Numerical And Experimental Analyses written by Mabrouk Mosbahi and has been published by Bentham Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-12-14 with Science categories.
This handbook is a guide to numerical and experimental processes that are used to analyze and improve the efficiency of vertical axis rotors. Chapters present information that is required to optimize the geometrical parameters of rotors or understand how to augment upstream water velocity. The authors of this volume present a numerical model to characterize the water flow around the vertical axis rotors using commercial CFD code in Ansys Fluent®. The software has been used to select adequate parameters and perform computational simulations of spiral Darrieus turbines. The contents of the volume explain the experimental procedure carried out to evaluate the performance of the spiral Darrieus turbine, how to characterize the water flow in the vicinity of the tested turbine and the method to assess the spiral angle influence on the turbine performance parameters. Results for different spiral angles (ranging from 10° to 40°) are presented. This volume is a useful handbook for engineers involved in power plant design and renewable energy sectors who are studying the computational fluid dynamics of vertical axis turbines (such as Darrieus turbines) that are used in hydropower projects. Key features: - 4 chapters that cover the numerical and experimental analysis of vertical axis rotors and hydrokinetic turbines - Simple structured layout for easy reading (methodology, models and results) - Bibliographic study to introduce the reader to the subject - A wide range of parameters included in experiments - A comprehensive appendix of tables for mechanical parameters, statistical models, rotor parameters and geometric details.
Numerical Analysis Of An Axial Flow Horizontal Axis Marine Hydrokinetic Turbine
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Author : Aarshana Parekh
language : en
Publisher:
Release Date : 2019
Numerical Analysis Of An Axial Flow Horizontal Axis Marine Hydrokinetic Turbine written by Aarshana Parekh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Tidal energy extraction using marine hydrokinetic devices has become an important area of research in the renewable energy field in recent years because of the highly predictable nature of the tides. Due to its early stage of development, many studies need yet to be done before deployment of these devices at tidal sites. It is essential to have a thorough understanding of the turbine performance and wake properties before determining the array arrangement for tidal farms. In this thesis, flow behavior in the wake of a counter-rotating dual rotor horizontal axis tidal turbine is studied by numerically solving the Reynolds Averaged Navier Stokes (RANS) Equations. The rotational effects of the turbine are modeled using the sliding mesh technique. The realizable k-epsilon model is employed to solve the closure problem. The methodology is validated against experimental data measured in open channel tests conducted at the St. Anthony Falls Laboratory of the University of Minnesota, in collaboration with Sandia National Laboratory, to investigate the turbine efficiency and the physical dynamics of the wake. The transient performance of the turbine is predicted with good accuracy using the sliding mesh model, with some level of disagreement found in predicting the velocity deficit in the flow. The limitations of accurately predicting the turbulent flow properties for the turbine are addressed and the sliding mesh technique is proven to capture effectively the different coherent structures in the wake. The qualitative agreement of the method suggests that this model can be used to explore turbine design and wake characteristics over various parameters in a cost-effective manner. This method can also provide critical parameters needed for designing efficient tidal farms.
Experimental And Numerical Assessment Of A Tidal Turbine Control Strategy
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Author : Magnus Johnston Harrold
language : en
Publisher:
Release Date : 2016
Experimental And Numerical Assessment Of A Tidal Turbine Control Strategy written by Magnus Johnston Harrold and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Interest has increased on the usage of renewable energy in order to reduce the current global dependence on fossil fuels, a finite source of power that is also contributing to climate change. For many coastal countries, this has led to a number of research developments in tidal stream energy extraction, whereby flowing water is harnessed in a manner similar to the way in which wind turbines generate power from moving air. Unlike wind energy, however, the tides are predictable and thus tidal turbines could provide a reliable contribution of renewable energy to meet national energy demands. In 2015, Tidal Energy Ltd. (TEL) installed a grid connected tidal turbine off the Pembrokeshire coast in Wales, U.K., making it one of the first full-scale tidal stream energy demonstration projects underway worldwide. The device has many parallels to a typical wind turbine, featuring three blades on a horizontal-axis rotor that drive an induction generator. However, its power regulation control strategy is unlike the standard methods used in the wind industry. The turbine was designed to limit both power and thrust in high tidal flows through the controlled overspeed of the rotor. This can be achieved with minimal controller complexity, plus there are a number of perceived cost and reliability benefits for the turbine system as a whole by adopting this control philosophy. The control system is assessed in this thesis by firstly developing a numerical model of the turbine. Simulation results from the model were found to agree favourably with those obtained independently from a commercially available tidal turbine design code, predicting that the control strategy yields desirable power and thrust characteristics in all flow conditions. Further verification of the control strategy was subsequently achieved by experimentally testing a 1:30 scale model turbine in a laboratory flume tank. Using only the measurement of rotor speed as an input to the control system, the model turbine successfully tracked the maximum power condition in a time varying flow, before overspeeding to limit power and thrust in the highest flows. Prior to the testing of the full-scale turbine, the flow sensors to be installed alongside the device were tested in both harbour and laboratory environments in order to better understand their capabilities. The results of which provided supplementary evidence to form conclusions on the performance of the full-scale device, including the ability to identify suspected yaw errors and track unsteady upstream flows. Once the turbine was installed at sea, its initial power performance was assessed in accordance to industry guidelines, while a methodology was developed to infer the operational rotor forces from strain gauges placed in the blades. The full-scale turbine demonstrated the expected power and thrust limiting behaviour from overspeeding the rotor, but a control system upgrade is required for the device to fully realise its potential. Thus the research in this thesis contributes to current understanding of numerical modelling, scale model testing, environmental characterisation, and full-scale testing for the purposes of tidal stream energy generation.
Vertical Axis Hydrokinetic Turbines
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Author : Mabrouk Mosbahi; Ahmed
language : en
Publisher:
Release Date : 2021-12-14
Vertical Axis Hydrokinetic Turbines written by Mabrouk Mosbahi; Ahmed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-12-14 with categories.
This handbook is a guide to numerical and experimental processes that are used to analyze and improve the efficiency of vertical axis rotors. Chapters present information that is required to optimize the geometrical parameters of rotors or understand how to augment upstream water velocity. The authors of this volume present a numerical model to characterize the water flow around the vertical axis rotors using commercial CFD code in Ansys Fluent®. The software has been used to select adequate parameters and perform computational simulations of spiral Darrieus turbines. The contents of the volume explain the experimental procedure carried out to evaluate the performance of the spiral Darrieus turbine, how to characterize the water flow in the vicinity of the tested turbine and the method to assess the spiral angle influence on the turbine performance parameters. Results for different spiral angles (ranging from 10° to 40°) are presented. This volume is a useful handbook for engineers involved in power plant design and renewable energy sectors who are studying the computational fluid dynamics of vertical axis turbines (such as Darrieus turbines) that are used in hydropower projects. Key features: - 4 chapters that cover the numerical and experimental analysis of vertical axis rotors and hydrokinetic turbines - Simple structured layout for easy reading (methodology, models and results) - Bibliographic study to introduce the reader to the subject - A wide range of parameters included in experiments - A comprehensive appendix of tables for mechanical parameters, statistical models, rotor parameters and geometric details.
Proceedings Of The International Conference On Sustainable Environment Agriculture And Tourism Icoseat 2022
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Author : Arifin Dwi Saputro
language : en
Publisher: Springer Nature
Release Date : 2023-02-10
Proceedings Of The International Conference On Sustainable Environment Agriculture And Tourism Icoseat 2022 written by Arifin Dwi Saputro and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-02-10 with Technology & Engineering categories.
This is an open access book. ICOSEAT 2022 was held on July 21–23, 2022 in Bangka Island, one of the wonderful places of Indonesia. Articles in the field of Agroindustry and Appropriate Technology 4.0; Environmental and Mining Engineering; Sustainable Development and Tourism Management; Agriculture and Food Engineering; and Marine, Aquaculture and Biological Science. ICOSEAT provides a forum for Academic, Business and Government to present and discuss topics on recent development in those fields.
Wave And Tidal Energy
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Author : Carlos Guedes Soares
language : en
Publisher: MDPI
Release Date : 2020-06-25
Wave And Tidal Energy written by Carlos Guedes Soares and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-06-25 with Technology & Engineering categories.
Concerns relating to energy supply and climate change have driven renewable energy targets around the world. Marine renewable energy could make a significant contribution to reducing greenhouse gas emissions and mitigating the consequences of climate change, while providing a high-technology industry. The conversion of wave and tidal energy into electricity has many advantages. Individual tidal and wave energy devices have been installed and proven, with commercial arrays planned throughout the world. The wave and tidal energy industry has developed rapidly in the past few years; therefore, it seems timely to review current research and map future challenges. Methods to improve understanding of the resource and interactions (between energy extraction, the resource and the environment) are considered, such as resource characterisation (including electricity output), design considerations (e.g., extreme and fatigue loadings) and environmental impacts, at all timescales (ranging from turbulence to decadal) and all spatial scales (from device and array scales to shelf sea scales).
Experimental And Numerical Investigation Of Turbulence And Wake Effects In Tidal Turbine Arrays
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Author : Martin Klaus Rudolf Alexander Nuernberg
language : en
Publisher:
Release Date : 2017
Experimental And Numerical Investigation Of Turbulence And Wake Effects In Tidal Turbine Arrays written by Martin Klaus Rudolf Alexander Nuernberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.