Author: Fardin Khalili
Publisher:
ISBN: 9781303988929
Category :
Languages : en
Pages : 61

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Book Description

Author: Samson Victor
Publisher:
ISBN:
Category :
Languages : en
Pages : 76

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Book Description
The disastrous effect of climate change has motivated scientists and engineers around the world to reduce dependency on fossil fuels. Among many alternative sources of energy, power production by wind energy has increased exponentially for last few years. Along this spectrum, efforts are made to investigate the possibility to install wind turbine on high roof tops. The onsite generation will also help to integrate micro wind turbines with urban areas. The proposed research work focuses on the CFD study of a Vertical Axis Wind Turbine (Troposkien-shaped) mounted on the upstream edge of a building, so that flow acceleration generated by the edge of the building contributes to enhance performance of the turbine. The CFD methodology validation is done by comparison of performance with experimental data. Geometric configuration of Sheldahl’s models is used for unsteady 3D flow of roof mounted Troposkien wind turbine. Three different turbine placement positions at different heights are investigated to observe Cp - n curve sensitivity at various tip speed ratios. Position 1 and Position 2 are at the edge of the building, whereas position 3 is a few meters away from the edge, directed towards the geometric center of a building. To simulate realistic atmospheric wind conditions, wind gradient is imposed at the inlet, with fixed desired velocity pointing to the middle of the wind turbine. Geometry and numerical setup is described in details, along with the obtained results. The optimal placement position of the turbine shows improvement in the power coefficient from 0.33 to 0.4 at low wind speeds.

Author: Krishna Guha Velliyur Ramachandran
Publisher:
ISBN:
Category :
Languages : en
Pages : 57

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Book Description
Abstract: With rising demand for energy and depletion of non-renewable sources, new avenues of energy production are being explored. Wind energy is one popular alternative to meet the energy needs of the future. Apart from visual impact and dependence on strong wind conditions for good performance efficiency, aerodynamic noise from wind turbines serves to be a major obstacle for their societal acceptance. This study tries to understand the propagation of wind turbine noise to the far-field, particularly in the lower frequencies using a technique based on inverse acoustic methods, the Acoustic Intensity Based Method(AIBM). At first, far-field noise radiation from NACA-2409 and NREL S809 airfoil is predicted using AIBM coupled with 2-D Computational Fluid Dynamics(CFD) simulations. Far-field noise radiation predictions for the airfoils are shown to be accurate. Aeroscoustic characteristics of NREL Phase VI Horizontal Axis Wind Turbine rotor are then analyzed using AIBM. The flow field in 3-D is obtained by solving the Unsteady Reynolds Averaged Navier-Stokes Equations(U-RANS). The CFD results of the flow field are validated against experimental data and they show good agreement. Thickness noise, created by displacement of a mass of air by the rotating blades and loading noise, created by the rotor interacting with local flow deficiencies, are identified as the two causes of low frequency noise based on the calculated directivity patterns. The ultimate objective is to evaluate the capability of a hybrid approach involving flow field data and AIBM to predict far-field noise for practical applications such as wind turbines.

Author: Dan Zhao
Publisher: Academic Press
ISBN: 0128171367
Category : Science
Languages : en
Pages : 532

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Book Description
Wind Turbines and Aerodynamics Energy Harvesters not only presents the most research-focused resource on aerodynamic energy harvesters, but also provides a detailed review on aeroacoustics characteristics. The book considers all developing aspects of 3D printed miniature and large-size Savonious wind harvesters, while also introducing and discussing bladeless and aeroelastic harvesters. Following with a review of Off-shore wind turbine aerodynamics modeling and measurements, the book continues the discussion by comparing the numerical codes for floating offshore wind turbines. Each chapter contains a detailed analysis and numerical and experimental case studies that consider recent research design, developments, and their application in practice. Written by an experienced, international team in this cross-disciplinary field, the book is an invaluable reference for wind power engineers, technicians and manufacturers, as well as researchers examining one of the most promising and efficient sources of renewable energy. - Offers numerical models and case studies by experienced authors in this field - Contains an overview and analysis of the latest research - Explores 3D printing technology and the production of wind harvesters for real applications - Includes, and uses, ANSYS FLUENT case files

Author: Jennifer Ann Cordero
Publisher:
ISBN:
Category :
Languages : en
Pages : 124

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Book Description
Results show that this method can have a significant impact on the wind turbine industry. Information provided by this technique can be used to minimize vibrations and variational loading that cause stress and fatigue. This capability will ultimately extend the life of the blades, reduce the overall cost of the turbine and help make wind power more competitive with traditional forms of energy.

Author: Konrad Kacprzak
Publisher:
ISBN: 9781517272746
Category :
Languages : en
Pages : 92

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Book Description
Savonius wind turbine CFD analysis.

Author: Bernhard Stoevesandt
Publisher: Springer Nature
ISBN: 3030313077
Category : Technology & Engineering
Languages : en
Pages : 1495

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Book Description
This handbook provides both a comprehensive overview and deep insights on the state-of-the-art methods used in wind turbine aerodynamics, as well as their advantages and limits. The focus of this work is specifically on wind turbines, where the aerodynamics are different from that of other fields due to the turbulent wind fields they face and the resultant differences in structural requirements. It gives a complete picture of research in the field, taking into account the different approaches which are applied. This book would be useful to professionals, academics, researchers and students working in the field.

Author: Alessandro Bianchini
Publisher: MDPI
ISBN: 3036511652
Category : Technology & Engineering
Languages : en
Pages : 308

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Book Description
The book contains the research contributions belonging to the Special Issue "Numerical Simulation of Wind Turbines", published in 2020-2021. They consist of 15 original research papers and 1 editorial. Different topics are discussed, from innovative design solutions for large and small wind turbine to control, from advanced simulation techniques to noise prediction. The variety of methods used in the research contributions testifies the need for a holistic approach to the design and simulation of modern wind turbines and will be able to stimulate the interest of the wind energy community.

Author: Siegfried Wagner
Publisher: Springer Science & Business Media
ISBN: 3642887104
Category : Technology & Engineering
Languages : en
Pages : 216

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Book Description
Over the last five years an enormous number of wind turbines have been installed in Europe, bringing wind energy into public awareness. However, its further development is restricted mainly by public complaints caused by visual impact and noise. The European Commission has therefore funded a number of research projects in the field of wind turbine noise within the JOULE program. This book presents the most relevant results of these projects. The book addresses all relevant aspects of wind turbine noise, namely: noise reduction, noise propagation, noise measurement, and an introduction to aeroacoustics. It may serve as a first reference in the field of wind turbine noise for researchers, planners, and manufacturers.

Author: Alison Zilstra
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 79

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Book Description
Aeroacoustic noise from wind turbines is often an obstacle in the implementation of wind farms. Reduction of this noise is key to allowing the expansion of the wind energy sector which is crucial for decreasing the dependence on fossil fuel energy sources. The use of a fully analytical computational model for aeroacoustic noise will allow for acoustics to be incorporated into the design stage of new wind turbine technologies. This thesis investigates the use of a predictive model for the noise from two dimensional (2D) blade segments using computational fluid dynamics (CFD). The simulation uses Reynolds Averaged Navier-Stokes (RANS) to initialize the simulation, and then a combination of Large Eddy Simulation (LES) and the Ffowcs-Williams and Hawkings (FW-H) acoustic analogy to predict the flow and acoustics, respectively. The SD 7037 and NACA 0012 airfoils were simulated and compared against experimental flow and acoustics data. The SD 7037 airfoil was tested using incompressible and compressible LES simulation for a Reynolds number of Re=4.25x104. The results show good prediction of both the flow and acoustics, and the source of the tonal noise generated by the airfoil at 0° angle of attack (AOA) was determined to be a result of 2D boundary layer behaviour, and also the transition from 2D to 3D behaviour. The 1° AOA results did not predict the tonal noise found in experiments, but it was determined that inaccuracies in some of the simulations caused the boundary layer behaviour to falsely change to that of the experimental 2° or 3° AOA. The NACA 0012 airfoil was tested using incompressible LES for a high Re case of Re=1.5x106. The flow simulation for this case was good, however the acoustic prediction was at a higher sound pressure level (SPL) than the experimental data. The second case of this simulation predicted tonal noise when experiments predicted broadband noise only. The simulation of this false tonal noise was attributed to instabilities in the simulation. The differences between the SD 7037 1° results, where instabilities caused no tones to be simulated, and the NACA 0012 results for the second case, where instabilities caused false tones to be predicted, shows that care must be taken in the setup of the simulation. Recommendations for future work are to perform a grid independence study and sensitivity analysis to determine the cause of these false predictions. That being said, overall, the predictive abilities of the computational aeroacoustic model result in good prediction of the airfoil self-noise for static AOAs.