The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Ernesto Benini - One of the best experts on this subject based on the ideXlab platform.
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optimization of a darrieus vertical axis Wind Turbine using blade element momentum theory and evolutionary algorithm
Renewable Energy, 2013Co-Authors: Gabriele Bedon, Marco Raciti Castelli, Ernesto BeniniAbstract:Wind Turbine Design procedures usually involve the adoption of the blade element – momentum theory. Nevertheless, its use is limited by the lack of extended database regarding the aerodynamic coefficients for most used airfoils. In the present work, an extended database generation procedure for symmetric profiles is discussed and validated with the aim of adopting numerical optimization methods for vertical-axis Wind Turbine Design.
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optimization of a darrieus vertical axis Wind Turbine using blade element momentum theory and evolutionary algorithm
Renewable Energy, 2013Co-Authors: Gabriele Bedon, Marco Raciti Castelli, Ernesto BeniniAbstract:Abstract Wind Turbine Design procedures usually involve the adoption of the blade element – momentum theory. Nevertheless, its use is limited by the lack of extended database regarding the aerodynamic coefficients for most used airfoils. In the present work, an extended database generation procedure for symmetric profiles is discussed and validated with the aim of adopting numerical optimization methods for vertical-axis Wind Turbine Design. Evolutionary algorithms are thereby utilized to provide optimal configurations for different Design objectives. The pure performance and the annual energy production are here considered in order to show the capabilities of the numerical code. A relevant increase in performance is achieved for all the obtained results, showing that the numerical optimization can be successfully adopted in vertical-axis Wind Turbine Design procedures.
Wenbin Ju - One of the best experts on this subject based on the ideXlab platform.
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Multibody modeling of varying complexity for dynamic analysis of large-scale Wind Turbines
Renewable Energy, 2016Co-Authors: Xin Jin, Zhaolong Zhang, Wenbin Ju, Lang Li, Xiangang YangAbstract:Guaranteeing a robust and reliable Wind Turbine Design under increasingly demanding conditions requires an expert insight into dynamic loading effects of the complete Turbine and its subsystems. Traditionally, aeroelastic codes are used to model the Wind Turbine, where the gearbox is reduced to a few or only one degree of freedom, as bring limitations to describe the dynamic behavior in detail. In this paper, the gearbox dynamic behavior is assessed by means of three multibody models of varying complexity, which are assessed based on modal and dynamic behaviors. This work shows that the fully flexible multibody dynamic model can better reflect the operating condition of the Wind Turbine. However, due to high calculation precision, the fully flexible multibody dynamic model consumes much times. Therefore, an artificial neural network method is proposed for the prediction of Wind Turbine dynamic behaviors. The results show that combination of the multibody method and the artificial neural network can reduce the simulation runtime, guaranteeing the accuracy meantime. Therefore, it is of great significance in engineering practice.
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Darrieus vertical axis Wind Turbine: Basic research methods
Renewable and Sustainable Energy Reviews, 2014Co-Authors: Xin Jin, Kejun Gao, Gaoyuan Zhao, Wenbin JuAbstract:Horizontal axis Wind Turbines (HAWTs) are the mainstream of Wind power industry in the world; however, as Turbines are becoming bigger, the maintenance of equipments grows more complex and costs much higher. Compared with HAWTs, Darrieus vertical axis Wind Turbines (VAWTs) have more technological advantages, providing an alternative for the Wind power technology; hence Darrieus VAWTs are catching more eyes. Nevertheless, the majority of Wind Turbine Design currently focuses on HAWTs, researches on Darrieus VAWTs have lagged significantly behind those on HAWTs, which have greatly hindered the development of VAWTs. Accordingly, this paper reviews the main basic research methods and their corresponding applications in Darrieus VAWTs, aiming to let more experts know the current research status and also provide some guidance for relevant researches.
Sin Chew Poh - One of the best experts on this subject based on the ideXlab platform.
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Cross axis Wind Turbine: Pushing the limit of Wind Turbine technology with complementary Design
Applied Energy, 2017Co-Authors: Wen Tong Chong, Kok Hoe Wong, Mohammed Gwani, Yung Jeh Chu, Wan Khairul Muzammil, Chin-tsan Wang, Sin Chew PohAbstract:In unfavourable Wind conditions, factors such as low Wind speed, high turbulence, and constant Wind direction change can reduce the power production of a horizontal axis Wind Turbine. Certain vertical axis Wind Turbine Design principles perform well under these harsh operating conditions; but, these Wind rotors typically have low power coefficients. To overcome the problems above, a novel cross axis Wind Turbine has been conceptualised to maximise Wind energy generation. This is achieved via harnessing the Wind energy from both the horizontal and vertical components of the oncoming Wind. The cross axis Wind Turbine comprises three vertical blades and six horizontal blades arranged in a cross axis orientation. Initial testing using deflectors to guide the oncoming airflow upward showed that the cross axis Wind Turbine produced significant improvements in power output and rotational speed performance compared to a conventional straight-bladed vertical axis Wind Turbine. In particular, it was found that the cross axis Wind Turbine integrated with a 45° deflector produced a power coefficient 2.8 times higher than the vertical axis Wind Turbine. The rotor rotational speed was increased by 70% with well-improved starting behaviour. Initial computational fluid dynamics analysis was done to illustrate the flow field of the deflected air stream by an omni-directional shroud. The simulation showed that the approaching air is deflected upwards by the guide-vane, which would interact with the horizontal blades and produce additional torque. The cross axis Wind Turbine is applicable in many locations, creating significant opportunities for Wind energy devices and therefore reducing dependencies on fossil fuel.
Gabriele Bedon - One of the best experts on this subject based on the ideXlab platform.
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optimization of a darrieus vertical axis Wind Turbine using blade element momentum theory and evolutionary algorithm
Renewable Energy, 2013Co-Authors: Gabriele Bedon, Marco Raciti Castelli, Ernesto BeniniAbstract:Wind Turbine Design procedures usually involve the adoption of the blade element – momentum theory. Nevertheless, its use is limited by the lack of extended database regarding the aerodynamic coefficients for most used airfoils. In the present work, an extended database generation procedure for symmetric profiles is discussed and validated with the aim of adopting numerical optimization methods for vertical-axis Wind Turbine Design.
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optimization of a darrieus vertical axis Wind Turbine using blade element momentum theory and evolutionary algorithm
Renewable Energy, 2013Co-Authors: Gabriele Bedon, Marco Raciti Castelli, Ernesto BeniniAbstract:Abstract Wind Turbine Design procedures usually involve the adoption of the blade element – momentum theory. Nevertheless, its use is limited by the lack of extended database regarding the aerodynamic coefficients for most used airfoils. In the present work, an extended database generation procedure for symmetric profiles is discussed and validated with the aim of adopting numerical optimization methods for vertical-axis Wind Turbine Design. Evolutionary algorithms are thereby utilized to provide optimal configurations for different Design objectives. The pure performance and the annual energy production are here considered in order to show the capabilities of the numerical code. A relevant increase in performance is achieved for all the obtained results, showing that the numerical optimization can be successfully adopted in vertical-axis Wind Turbine Design procedures.
Denis Matha - One of the best experts on this subject based on the ideXlab platform.
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efficient preliminary floating offshore Wind Turbine Design and testing methodologies and application to a concrete spar Design
Philosophical Transactions of the Royal Society A, 2015Co-Authors: Denis Matha, Frank Sandner, Climent Molins, Alexis Campos, Po Wen ChengAbstract:The current key challenge in the floating offshore Wind Turbine industry and research is on Designing economic floating systems that can compete with fixed-bottom offshore Turbines in terms of levelized cost of energy. The preliminary platform Design, as well as early experimental Design assessments, are critical elements in the overall Design process. In this contribution, a brief review of current floating offshore Wind Turbine platform pre-Design and scaled testing methodologies is provided, with a focus on their ability to accommodate the coupled dynamic behaviour of floating offshore Wind systems. The exemplary Design and testing methodology for a monolithic concrete spar platform as performed within the European KIC AFOSP project is presented. Results from the experimental tests compared to numerical simulations are presented and analysed and show very good agreement for relevant basic dynamic platform properties. Extreme and fatigue loads and cost analysis of the AFOSP system confirm the viability of the presented Design process. In summary, the exemplary application of the reduced Design and testing methodology for AFOSP confirms that it represents a viable procedure during pre-Design of floating offshore Wind Turbine platforms.
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model development and loads analysis of a Wind Turbine on a floating offshore tension leg platform
2010Co-Authors: Denis Matha, T Fischer, Martin Kuhn, Jason JonkmanAbstract:This report presents results of the analysis of a 5-MW Wind Turbine located on a floating offshore tension leg platform (TLP) that was conducted using the fully coupled time-domain aero-hydro-servo-elastic Design code FAST with AeroDyn and HydroDyn. Models in this code are of greater fidelity than most of the models that have been used to analyze floating Turbines in the past--which have neglected important hydrodynamic and mooring system effects. The report provides a description of the development process of a TLP model, which is a modified version of a Massachusetts Institute of Technology Design derived from a parametric linear frequency-domain optimization process. An extensive loads and stability analysis for ultimate and fatigue loads according to the procedure of the International Electrotechnical Commission offshore Wind Turbine Design standard was performed with the verified TLP model. Response statistics, extreme event tables, fatigue lifetimes, and selected time histories of Design-driving extreme events are analyzed and presented. Loads for the Wind Turbine on the TLP are compared to those of an equivalent land-based Turbine in terms of load ratios. Major instabilities for the TLP are identified and described.
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model development and loads analysis of an offshore Wind Turbine on a tension leg platform with a comparison to other floating Turbine concepts april 2009
Related Information: Work performed under subcontract with the University of Colorado Boulder Colorado, 2010Co-Authors: Denis MathaAbstract:This report presents results of the analysis of a 5-MW Wind Turbine located on a floating offshore tension leg platform (TLP) that was conducted using the fully coupled time-domain aero-hydro-servo-elastic Design code FAST with AeroDyn and HydroDyn. The report also provides a description of the development process of the TLP model. The model has been verified via comparisons to frequency-domain calculations. Important differences have been identified between the frequency-domain and time-domain simulations, and have generated implications for the conceptual Design process. An extensive loads and stability analysis for ultimate and fatigue loads according to the procedure of the IEC 61400-3 offshore Wind Turbine Design standard was performed with the verified TLP model. This report compares the loads for the Wind Turbine on the TLP to those of an equivalent land-based Turbine. Major instabilities for the TLP are identified and described.
