Aerodynamic loads calculation and analysis for large scale wind turbine based on combining BEM modified theory with dynamic stall model

Dai, Juchuan; Hu, Yanping; Liu, D.S.; Long, Xin

doi:10.1016/j.renene.2010.08.024

Cited by 107 publications

(44 citation statements)

References 7 publications

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“…Yu et al [10] pointed out that the blade deformation has a non-negligible influence on the aerodynamic loads for large-scale wind turbines, and thus the effect should be accounted for properly. Dai et al [34] recommended the inclusion of blade vibration velocities in the Blade ElementMomentum (BEM) theory. They carried out simulations assuming a steady free stream wind with considerations of wind shear and tower shadow effects, and found that the fluctuation amplitudes and average values of the blade loads varied considerably when taking the blade vibration into account.…”

Section: Blade Flexibilitymentioning

confidence: 99%

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

et al. 2017

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The blades of a large Horizontal Axis Wind Turbine (HAWT) are subjected to significant vibrations during operation. The vibrations affect the dynamic flow field around the blade and consequently alter the aerodynamic forces on the blade. In order to better understand the influence of blade vibrations on the aerodynamic loads, the dynamic stall characteristics of an S809 airfoil undergoing translational motion as well as pitching motion were investigated using Computational Fluid Dynamics (CFD) techniques. Simulation results indicated that both the out-of-plane and in-plane translational motions of the airfoil affect the unsteady aerodynamic forces significantly. In order to investigate the effects of blade vibration on the aerodynamic load on a large-scale HAWT blade during its operating lifetime, an aerodynamic model based on the Blade Element-Momentum (BEM) theory and the Beddoes-Leishman (B-L) dynamic stall model was proposed. The BEM model was revised to account for the vibration-induced velocity components in the calculation of the effective angle of attack. Aerodynamic load analysis of a 5 MW wind turbine was then performed and the impact of blade vibration on the lifetime aerodynamic fatigue loads was analysed.

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Section: Blade Flexibilitymentioning

confidence: 99%

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

et al. 2017

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“…The blade consists of a cylindrical section and NACA63-xxx serial aerofoil. Since field test of wind-rotor aerodynamic characteristics of large-scale wind turbines is very difficult, according to the orthogonal experimental method, 1200 sets of wind-rotor aerodynamic data, which are calculated based on combining BEM-modified theory with dynamic stall model [15], are adopted as the sample data. Some sample data for a blade are shown in Table 1.…”

Section: Sample Calculation and Analysismentioning

confidence: 99%

Modelling and analysis of direct-driven permanent magnet synchronous generator wind turbine based on wind-rotor neural network model

Dai

Liu

et al. 2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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A new practical way of modelling direct-driven permanent magnet synchronous generator (PMSG) wind turbines is proposed. The model emphasizes on the wind-rotor-to-PMSG-to-converter-to-grid system, which is the main energy flow system of the direct-driven wind turbine. In this article, a new wind-rotor back propagation neural network is proposed, which consists of a four-layer network and is used to describe the wind-rotor aerodynamic characteristics. According to the orthogonal experimental method, 1200 sets of wind-rotor aerodynamic data, which are calculated based on combining blade element momentum-modified theory with a dynamic stall model, are adopted as the sample data; and the wind-rotor neural network is trained using the Levenberg-Marquardt algorithm. Then, the coupling dynamic models of the wind-rotor and PMSG, and AC-DC-AC converter model are established, respectively; the control strategies for the generator-side and grid-side converters are constructed, too. The mechanical model, electric model, and control model are integrated into the whole simulation model, and the numerical simulation are carried out. The research results show that all the wind-rotor aerodynamic characteristics, electrical characteristics, and control characteristics can be obtained quickly and efficiently from the constructed model, and are helpful for optimization design and control for large-scale direct-direct PMSG wind turbines.

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“…Nilay et al [7] investigated the effect of steady and transient freestream wind shear on the wake structure and performance characteristics of a horizontal axis wind turbine rotor. Dai et al [8] proposed a set of calculation method of aerodynamic loads for large scale wind turbines under the condition that some influence factors such as wind shear, tower, tower and blade vibration were considered. Wang et al [9] discussed the effects of wind shear and wind shear coefficients on the near wake of a wind turbine.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of offshore wind turbine blades under the action of wind shear and fluctuating wind

Zhang¹,

Gong²,

Zhang³

et al. 2018

J. vibroeng.

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Aiming at large-scale offshore wind turbine blades, governing equations in fluid domain and motion equations in structural domain with geometric nonlinearity were built by the aid of ALE method. A three dimensional model under fluid-structure interaction (FSI) was established by using UG software and Geometry module, and numerical calculation for FSI vibration characteristics of wind turbine blades under the effects of wind shear and fluctuating wind was carried out based on ANSYS Workbench. The results indicate that the contribution of the combined action to displacement and Mises stress chiefly derives from the wind shear effect, which not only causes a comparatively larger increase for the maximum displacement and Mises stress, but also becomes bigger and bigger with the increase of average wind speed, and the fluctuating wind effect is insignificant. The maximum value of Mises stress in the blade section appears at the relative wingspan of 0.55, the maximum Mises stress varying with relative span length decreases progressively from the middle to both sides of the blade, and the contribution of wind shear effect alone, the combined action or wind speed increment to stress also shows the same change rule. Furthermore, in the maximum stress section along wingspan, Mises stress along the direction of blade thickness or chord length respectively presents two distribution laws, and reaches the maximum on the blade surface.

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Aerodynamic loads calculation and analysis for large scale wind turbine based on combining BEM modified theory with dynamic stall model

Cited by 107 publications

References 7 publications

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

Vibration-induced aerodynamic loads on large horizontal axis wind turbine blades

Modelling and analysis of direct-driven permanent magnet synchronous generator wind turbine based on wind-rotor neural network model

Dynamic analysis of offshore wind turbine blades under the action of wind shear and fluctuating wind

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