Elastic Actuator Line Modelling For The Wake Induced Fatigue Analysis Of Horizontal Wind Turbine
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Elastic Actuator Line Modelling For The Wake Induced Fatigue Analysis Of Horizontal Wind Turbine
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Author : Hang Meng
language : en
Publisher:
Release Date : 2018
Elastic Actuator Line Modelling For The Wake Induced Fatigue Analysis Of Horizontal Wind Turbine written by Hang Meng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Metals categories.
The fatigue damage on wind turbine blades will threaten the safety and stability of the wind turbine and thus lower the efficiency and economy of the power generation system. The wake-induced fatigue plays an important role in this fatigue damage, which has not been deeply studied in the previous research of this domain. This is because the calculation of fatigue damage on a wind turbine blade under wake conditions will include the knowledge of wind turbine wake (fluid mechanics), composite structure modelling (solid structure modelling), aero-elastic modelling (coupling between fluid and structures), and fatigue analysis. Moreover, the anisotropic composite wind turbine blade, e.g. bendtwist coupling blade, will also bring challenges for the structural modelling. To propose a model to solve the above problems holistically is the motivation of the thesis. In this thesis, to construct the aero-elastic model under wake conditions for fatigue analysis, the elastic actuator line model is proposed and verified. To consider the anisotropic properties of composite wind turbine blade, e.g. bend-twist coupling wind turbine blade, the anisotropic wind turbine blade structure model is constructed. Based on the structure model and cross sectional analysis method (BECAS), the fatigue analysis methodology is proposed. Due to the similarity between the anisotropic wind turbine blade structure model and Maxwell's equation (electromagnetic equations), the FDTD method, which is a FDM based method and long been used in electromagnetic simulation, is applied to construct a novel anisotropic wind turbine blade structure model. Specifically, firstly, the actuator line model is validated in terms of thrust coefficient and flow field prediction. It is found that the nacelle effect has impact on the velocity profile around wake center region. And the proposed single-point nacelle model, single momentum source point smeared by Gaussian function, can be used to correct the prediction not only for RANS turbulence model but also for LES turbulence model. Secondly, Based on NREL SOWFA, the elastic actuator line model is constructed as an aero-elastic model for wake conditions to simulate the dynamic loading of wind turbine blade. The stochastic and deterministic wake-induced fatigue loading are reproduced by the proposed elastic actuator line model. Compared with the explicit elastic actuator line model, the implicit elastic actuator line can run with larger time step. However, the accuracy of implicit method will decrease. Thirdly, the performance of normal and bend-twist coupling wind turbine blade with anisotropic composite materials in wake conditions are studied by using the fatigue analysis methodology based on anisotropic structure model, cross sectinal analysis, and fatigue analysis method. Based on this fatigue analysis methodology, the fatigue life of NREL 5MW wind turbine blade is analysed. The predicted fatigue life (26.0187 years) of the main structure (spar caps) is very close to the design life (20 years). From the fatigue analysis for wind turbines in wake conditions, it is found that the wake-induced fatigue has a significant impact on the fatigue life of wind turbine blades (fatigue life drops from 26.0187 years to 1.7388 years under compact layout). And wind farm layout can affect the wake-induced fatigue damage (increase from 1.7388 years (compact layout) to 6.9084 years (normal layout)). Furthermore, it is also found that the bend-twist coupling wind turbine blade can alleviate the fatigue load under wake condition. Lastly, the structure model based on FDTD method is constructed for anisotropic wind turbine blade and validated in terms of beams with deformation coupling, non-inertia coordinate system, and non-uniform sections (real wind turbine blade). The stability analysis for the proposed FDTD model is carried out, which shows that the root cause of the numerical instability for the proposed method is the highest-frequency mode in numerical model. Based on this analysis, the unconditionally stable explicit FDTD structure model is proposed and constructed, which strikes a balance between accuracy and efficiency. Compared with implicit method, the unconditionally stable explicit FDTD model overcomes its limitations on time step with little effect on its solution accuracy.
Numerical Simulation Of Wind Turbines
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Author : Alessandro Bianchini
language : en
Publisher: MDPI
Release Date : 2021-09-10
Numerical Simulation Of Wind Turbines written by Alessandro Bianchini and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-09-10 with Technology & Engineering categories.
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.
Liutex And Third Generation Of Vortex Definition And Identification
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Author : Chaoqun Liu
language : en
Publisher: Springer Nature
Release Date : 2021-07-26
Liutex And Third Generation Of Vortex Definition And Identification written by Chaoqun Liu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-07-26 with Science categories.
This book collects papers presented in the Invited Workshop, “Liutex and Third Generation of Vortex Definition and Identification for Turbulence,” from CHAOS2020, June 9-12, 2020, which was held online as a virtual conference. Liutex is a new physical quantity introduced by Prof. Chaoqun Liu of the University of Texas at Arlington. It is a vector and could give a unique and accurate mathematical definition for fluid rotation or vortex. The papers in this volume include some Liutex theories and many applications in hydrodynamics, aerodynamics and thermal dynamics including turbine machinery. As vortex exists everywhere in the universe, a mathematical definition of vortex or Liutex will play a critical role in scientific research. There is almost no place without vortex in fluid dynamics. As a projection, the Liutex theory will play an important role on the investigations of the vortex dynamics in hydrodynamics, aerodynamics, thermodynamics, oceanography, meteorology, metallurgy, civil engineering, astronomy, biology, etc. and to the researches of the generation, sustenance, modelling and controlling of turbulence.
Wind Turbine Aerodynamics And Vorticity Based Methods
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Author : Emmanuel Branlard
language : en
Publisher: Springer
Release Date : 2017-04-05
Wind Turbine Aerodynamics And Vorticity Based Methods written by Emmanuel Branlard and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-04-05 with Technology & Engineering categories.
The book introduces the fundamentals of fluid-mechanics, momentum theories, vortex theories and vortex methods necessary for the study of rotors aerodynamics and wind-turbines aerodynamics in particular. Rotor theories are presented in a great level of details at the beginning of the book. These theories include: the blade element theory, the Kutta-Joukowski theory, the momentum theory and the blade element momentum method. A part of the book is dedicated to the description and implementation of vortex methods. The remaining of the book focuses on the study of wind turbine aerodynamics using vortex-theory analyses or vortex-methods. Examples of vortex-theory applications are: optimal rotor design, tip-loss corrections, yaw-models and dynamic inflow models. Historical derivations and recent extensions of the models are presented. The cylindrical vortex model is another example of a simple analytical vortex model presented in this book. This model leads to the development of different BEM models and it is also used to provide the analytical velocity field upstream of a turbine or a wind farm under aligned or yawed conditions. Different applications of numerical vortex methods are presented. Numerical methods are used for instance to investigate the influence of a wind turbine on the incoming turbulence. Sheared inflows and aero-elastic simulations are investigated using vortex methods for the first time. Many analytical flows are derived in details: vortex rings, vortex cylinders, Hill's vortex, vortex blobs etc. They are used throughout the book to devise simple rotor models or to validate the implementation of numerical methods. Several Matlab programs are provided to ease some of the most complex implementations.
Aerodynamics Of Wind Turbines 2nd Edition
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Author : Martin O. L. Hansen
language : en
Publisher: Routledge
Release Date : 2013-05-13
Aerodynamics Of Wind Turbines 2nd Edition written by Martin O. L. Hansen and has been published by Routledge this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-13 with Technology & Engineering categories.
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.
Phatas Iii Aeroelastic Modelling
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Author : C. Lindenburg
language : en
Publisher:
Release Date : 1996
Phatas Iii Aeroelastic Modelling written by C. Lindenburg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Wind Energy Handbook
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Author : Tony Burton
language : en
Publisher: John Wiley & Sons
Release Date : 2001-12-12
Wind Energy Handbook written by Tony Burton and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-12-12 with Technology & Engineering categories.
As environmental concerns have focused attention on the generation of electricity from clean and renewable sources wind energy has become the world's fastest growing energy source. The Wind Energy Handbook draws on the authors' collective industrial and academic experience to highlight the interdisciplinary nature of wind energy research and provide a comprehensive treatment of wind energy for electricity generation. Features include: An authoritative overview of wind turbine technology and wind farm design and development In-depth examination of the aerodynamics and performance of land-based horizontal axis wind turbines A survey of alternative machine architectures and an introduction to the design of the key components Description of the wind resource in terms of wind speed frequency distribution and the structure of turbulence Coverage of site wind speed prediction techniques Discussions of wind farm siting constraints and the assessment of environmental impact The integration of wind farms into the electrical power system, including power quality and system stability Functions of wind turbine controllers and design and analysis techniques With coverage ranging from practical concerns about component design to the economic importance of sustainable power sources, the Wind Energy Handbook will be an asset to engineers, turbine designers, wind energy consultants and graduate engineering students.
Handbook Of Wind Energy Aerodynamics
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Author : Bernhard Stoevesandt
language : en
Publisher: Springer Nature
Release Date : 2022-08-04
Handbook Of Wind Energy Aerodynamics written by Bernhard Stoevesandt and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-08-04 with Technology & Engineering categories.
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.
Aij Recommendations For Loads On Buildings
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Author : Architectural institute of Japan (AIJ)
language : en
Publisher:
Release Date : 1996
Aij Recommendations For Loads On Buildings written by Architectural institute of Japan (AIJ) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Solar Energy Update
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Author :
language : en
Publisher:
Release Date : 1985
Solar Energy Update written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Solar energy categories.