On the calibration of rotational augmentation models for wind turbine load estimation by means of CFD simulations

Tafur, Belen Soledad Burgos; Daniele, Elia; Stoevesandt, Bernhard; Thomas, Philipp

doi:10.1007/s10409-020-00949-0

Cited by 15 publications

(6 citation statements)

References 27 publications

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“…3 (bottom) the sectional distribution of the chord to radius ratio (c/r) for the two blades shows that the single sections have quite similar c/r values. The chord to radius ratio is widely recognized as an important parameter in the rotational augmentation models [2,8,15,16,17,18,20]. Indeed, most of 3D correction models are based on the chord to radius ratio.…”

Section: Figure 2 Flowchart Of the Ibem Algorithm With Cfd 3d Data Inputmentioning

confidence: 99%

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On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

Mauro,

Lanzafame,

Messina

et al. 2023

J. Phys.: Conf. Ser.

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The physics of 3D flows on rotating blades is currently one of the most important research fields related to wind turbines. Although many authors have studied the phenomenon thoroughly and they have proposed meaningful physical explanation of the mechanism which triggers the onset of the rotational augmentation, a universal correlation between rotor geometry, operating conditions and centrifugal pumping effects has not been derived yet. For instance, all the proposed corrections for rotational stall delay within 1D codes have demonstrated fairly good accuracy but in limited operating range or for specific airfoils or rotor geometries. In the present work the authors applied a consolidated methodology, based on the use of accurate CFD 3D models and of an inverse BEM code, to thoroughly analyze the differences in terms of rotational augmentation effects between the two widely known NREL Phase VI and Phase II HAWTs. This choice was made precisely since both the rotors used the S809 airfoil for the active part of the blade, had equal radial dimensions and the operating conditions were approximately the same. Thus, the substantial difference between the rotors was the fact that the Phase VI blade was twisted and tapered while the Phase II one had constant chord and pitch along the radial direction. In this way, the possible influence due to the twist and taper of the blade on the physics of the centrifugal pumping could be highlighted more easily. The CFD models were developed in Ansys Fluent and validated against experimental measurements available in the literature. The inverse BEM code, already implemented in a previous work, allowed the authors to extrapolate and compare sectional data obtained through the CFD simulations. The post-processing of the results demonstrated the strong influence of the twist and taper of the blade on the dynamics of the rotational augmentation. These results lead the way for a better understanding of the relation between rotor geometry and centrifugal pumping physics.

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Section: Figure 2 Flowchart Of the Ibem Algorithm With Cfd 3d Data Inputmentioning

confidence: 99%

“…This was probably due to the effect of rotation on drag which depended on the airfoil shape. Burgos Tafur et al [18] proposed a calibration method for rotational augmentation models using the NREL Phase VI rotor as CFD/experimental benchmark. The novel formulation resulted in improved lift and drag coefficients prediction.…”

Section: Introductionmentioning

confidence: 99%

On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

Mauro,

Lanzafame,

Messina

et al. 2023

J. Phys.: Conf. Ser.

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show abstract

“…When the gain in the power output of the downstream turbine is greater than the loss in the power production from the yawed upstream turbine, the overall wind farm efficiency would be improved. In this themed issue, while Tafur et al [4] reported their recent research work to improve an engineering model of three-dimensional rotation effects of the wind turbines, Ye et al [5] proposed a multiple sliding method to simulate the aerodynamic characteristics of a typical horizontal-axis wind turbine under fixed and dynamic yawing operation. In addition, with the rapid development of offshore wind turbines in recent years, the method proposed by Ye et al [5] can also be used to investigate the aerodynamic characteristics of offshore wind turbines with motions of floating platform.…”

Section: Prefacementioning

confidence: 99%

Preface: Wind turbines: aeromechanics and farm optimization

Xiao-dong

2020

Acta Mech. Sin.

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“…They discussed the effects of blade attachment angle and radius ratio on the operating characteristics of wind turbines. Burgos Tafur et al [6] discussed the rotational augmentation effects of a large wind turbine utilizing CFD technology. These studies analyzed the aerodynamic characteristics of wind turbines and optimized the wind turbine based on numerical simulation, but the deformation of wind turbine blades is not considered.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of the Blade Deformation on Wind Turbine Output Power in the Framework of a Bidirectional Fluid-Structure Interaction Model

Yuan¹,

Liu²,

Li³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The blades of large-scale wind turbines can obviously deform during operation, and such a deformation can affect the wind turbine's output power to a certain extent. In order to shed some light on this phenomenon, for which limited information is available in the literature, a bidirectional fluid-structure interaction (FSI) numerical model is employed in this work. In particular, a 5 MW large-scale wind turbine designed by the National Renewable Energy Laboratory (NREL) of the United States is considered as a testbed. The research results show that blades' deformation can increase the wind turbine's output power by 135 kW at rated working conditions. Compared with the outcomes of the simulations conducted using the model with no blade deformation, the results obtained with the FSI model are closer to the experimental data. It is concluded that the bidirectional FSI model can replicate the working conditions of wind turbines with great fidelity, thereby providing an effective method for wind turbine design and optimization.

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On the calibration of rotational augmentation models for wind turbine load estimation by means of CFD simulations

Cited by 15 publications

References 27 publications

On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

On the influence of twist and taper of HAWT blades on the rotational augmentation phenomenon: the NREL Phase VI – Phase II comparison

Preface: Wind turbines: aeromechanics and farm optimization

Analysis of the Influence of the Blade Deformation on Wind Turbine Output Power in the Framework of a Bidirectional Fluid-Structure Interaction Model

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