Prediction of the wind turbine performance by using BEM with airfoil data extracted from CFD

Yang, Hua; Shen, Wen Zhong; Xu, Haoran; Hong, Zedong; Liu, Chao

doi:10.1016/j.renene.2014.05.002

Cited by 72 publications

(35 citation statements)

References 6 publications

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“…Efforts made by Rahimi et al [20,19,10,21] showed that the high fidelity of CFD simulations can help to improve the skewed wake engineering model for large rotor size turbines. Another example is the work of Yang et al [20] and Schneider et al [21] related to stall delay models. Nevertheless, in all these works one of the major limitations for the improvement of these correction models using measurements or 3D CFD lies in the many uncertainties involved on the definition of AoA and underlying axial and tangential induced velocity for 3D flows.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of different methods for determining the angle of attack on wind turbine blades with CFD results under axial inflow conditions

et al. 2018

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This work presents an investigation on different methods for the calculation of the angle of attack and the underlying induced velocity on wind turbine blades using data obtained from three-dimensional Computational Fluid Dynamics (CFD). Several methods are examined and their advantages, as well as shortcomings, are presented. The investigations are performed for two 10MW reference wind turbines under axial inflow conditions, namely the turbines designed in the EU AVATAR and INNWIND.EU projects. The results show that the evaluated methods are in good agreement with each other at the mid-span, though some deviations are observed at the root and tip regions of the blades. This indicates that CFD results can be used for the calibration of induction modeling for Blade Element Momentum (BEM) tools. Moreover, using any of the proposed methods, it is possible to obtain airfoil characteristics for lift and drag coefficients as a function of the angle of attack. Nomenclature ρ Air density [kg m −3 ] Γ Circulation [m 2 s −1 ]

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Section: Introductionmentioning

confidence: 99%

Evaluation of different methods for determining the angle of attack on wind turbine blades with CFD results under axial inflow conditions

et al. 2018

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“…BEM theory coupled with structural dynamics of the blade is also found to be in use in the literature which can predict the overall cost of energy from a wind turbine, Buck and Garvey [130]. In this context, Yang et al [131] extracted the airfoil data using CFD. The azimuthally averaged velocity was used instead of the local velocity for defining the attack angle, and lift and drag coefficients were determined using the forces on the airfoil while extracting airfoil data.…”

Section: Blade Element Momentum Theorymentioning

confidence: 99%

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

et al. 2018

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Among renewable sources of energy, wind is the most widely used resource due to its commercial acceptance, low cost and ease of operation and maintenance, relatively much less time for its realization from concept till operation, creation of new jobs, and least adverse effect on the environment. The fast technological development in the wind industry and availability of multi megawatt sized horizontal axis wind turbines has further led the promotion of wind power utilization globally. It is a well-known fact that the wind speed increases with height and hence the energy output. However, one cannot go above a certain height due to structural and other issues. Hence other attempts need to be made to increase the efficiency of the wind turbines, maintaining the hub heights to acceptable and controllable limits. The efficiency of the wind turbines or the energy output can be increased by reducing the cut-in-speed and/or the rated-speed by modifying and redesigning the blades. The problem is tackled by identifying the optimization parameters such as annual energy yield, power coefficient, energy cost, blade mass, and blade design constraints such as physical, geometric, and aerodynamic. The present paper provides an overview of the commonly used models, techniques, tools and experimental approaches applied to increase the efficiency of the wind turbines. In the present review work, particular emphasis is made on approaches used to design wind turbine blades both experimental and numerical, methodologies used to study the performance of wind turbines both experimentally and analytically, active and passive techniques used to enhance the power output from wind turbines, reduction in cut-in-speed for improved wind turbine performance, and lastly the research and development work related to new and efficient materials for the wind turbines.

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“…According to Refs. [17,18], the k-u SST turbulence model can properly simulate the flow in the near wall region, which is important for the accuracy of numerical calculations. Therefore, the k-u SST turbulence model is chosen to close the governing equations.…”

Section: Numerical Simulationmentioning

confidence: 99%

Numerical simulation of the effect of relative thickness on aerodynamic performance improvement of asymmetrical blunt trailing-edge modification

Zhang

Liu

2015

Renewable Energy

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a b s t r a c tIn this paper, the aerodynamic performance of wind turbine airfoils with different relative thicknesses and their modifications has been numerically investigated to facilitate a greater understanding of the effects of maximum relative thickness and its position on the aerodynamic performance improvement of asymmetrical blunt trailing-edge modification. The lift and drag coefficients of airfoil NACA4415 are calculated with the k-u SST turbulence model, and are compared with experimental data to validate the simulation accuracy of the Computational Fluid Dynamics (CFD) approach. The airfoils with different relative thicknesses are modified to be asymmetrical blunt trailing-edge airfoils by means of the software Xfoil. The best trailing-edge thickness distribution ratio is obtained by comparing the aerodynamic performance of the modifications with different distribution ratios. The aerodynamic performance of original airfoils and their asymmetrical modifications with the best thickness distribution ratio being 1:3 is investigated to analyze the increments of lift and drag coefficients and lift-drag ratio. Results indicate that with the increasing of relative thickness, the lift coefficient increment of NACA4418 airfoil is the smallest for the angle of attack more than 9 , and the drag coefficient increment as a whole decreases first and then increases, but the average lift-drag ratio increment of NACA4412 airfoil is the largest, closely followed by NACA4415 airfoil. It is also showed that with the relative thickness position close to the leading-edge, the increments of lift and drag coefficients decrease and increase for the angle of attack more than a certain value, respectively, and the average lift-drag ratio increment of NACA4415 airfoil is positive and larger than those of NACA4415-mod25 and NACA4415-mod20 airfoils. Therefore, the medium thickness airfoil whose relative thickness position is away from the leading-edge is more suited to the asymmetrical blunt trailing-edge modification.

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Prediction of the wind turbine performance by using BEM with airfoil data extracted from CFD

Cited by 72 publications

References 6 publications

Evaluation of different methods for determining the angle of attack on wind turbine blades with CFD results under axial inflow conditions

Evaluation of different methods for determining the angle of attack on wind turbine blades with CFD results under axial inflow conditions

Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review

Numerical simulation of the effect of relative thickness on aerodynamic performance improvement of asymmetrical blunt trailing-edge modification

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