Experimental evidence of coupled-mode flutter in a two-meter-long non-rotating wind turbine blade

Boersma, Pieter; Benner, Bridget; Currier, Todd; Modarres‐Sadeghi, Yahya

doi:10.1016/j.jfluidstructs.2022.103611

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Model validation was conducted, and the results were compared with Zhao's work [14]. The same computational domain was used; the center of the rotor blades, which is also the center of the hub, coincided with the center of global coordinates.…”

Section: Computational Domain and Boundary Settingsmentioning

confidence: 99%

“…Wind 2023, 3 et al [13] conducted a review of model experimental methods for floating offshore wind turbines, addressing their development status and existing limitations. Boersma et al [14] built a scaled-down model of the 61 m NREL 5-MW blade (30:1), and conducted a series of experiments on it. They observed coupled-mode flutter, which further proved that larger wind turbine blades are susceptible to coupled-mode flutter.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation of Aerodynamic Performances for NREL 5-MW Offshore Wind Turbine

Zhang

Wang

2023

Wind

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As one of the preferred types of renewable energy, wind energy is rapidly growing. The purpose of this study is to provide a comprehensive and in-depth numerical analysis on the National Renewable Energy Lab (NREL) 5-MW offshore wind turbine to help understand the wind turbine’s aerodynamic features. In this research, the preprocessing was conducted by using SolidWorks modeling, and a realizable k-ε viscous model from ANSYS/FLUENT was used as the solver in the CFD simulation. Eight test cases were developed, and fixed inlet velocity 9 m/s was set as the baseline case. After the initial mesh independent study and model validation, a detailed numerical analysis was carried out. The results of near wake flow features, torque and thrust, pressure and pressure coefficient distribution, limiting streamline along wind turbine blades, power coefficient as a function of tip speed ratio were evaluated. Whenever possible, simulation results were compared with data in the literature (numerical or experimental), and good agreement was observed. The detailed wind turbine aerodynamic analysis results are expected to provide valuable input to wind turbine design and thus to improve the effectiveness of harnessing wind energy. Research is on the way to further understanding the influence of different inflow conditions on the aerodynamic characteristics.

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Section: Computational Domain and Boundary Settingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Aerodynamic Performances for NREL 5-MW Offshore Wind Turbine

Zhang

Wang

2023

Wind

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“…This observation verifies the theoretical study of predicting the susceptibility of large wind turbine blades to coupled mode flutter. 2 Sajedin et al used the Fourier transform to model the vibrating blade in traveling wave mode, solved the problem with SST-kω turbulent model and curvature-corrected-based viscous Navier-Stokes equation, and investigated the flutter instability of radial turbocharger turbine blades under pulsating inlet conditions. 3 Due to its high stiffness to weight ratio, composites have been widely used in the manufacture of turbine blades in recent years.…”

Section: Introductionmentioning

confidence: 99%

Stall nonlinear aeroelastic effects and active control of thin-walled composite blade with piezoelectric patches embedded

Liu

Cui

Zhao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Stall nonlinear flutter behavior and active control of anisotropic composite blade have been investigated based on piezoelectric actuation. The blade body comprises an elliptical composite host structure and a lightweight honeycomb skin structure. The composite blade with elliptical section is modeled as a thin-walled beam structure with circumferential asymmetric stiffness (CAS) configuration, exhibiting transverse shear deformation, warping restraint effect, and vertical bending, with structural tailoring implemented. The stall-induced flutter suppression and nonlinear aeroelastic effects of linearized dynamic response characteristics of blade incorporating stall nonlinear aerodynamic model are investigated. The nonlinear aeroelastic coupled equations are reduced to ordinary equations by the Galerkin method, with the aerodynamic force decomposed by strip theory. Active feedback control based on boundary moment control strategy is developed to enhance the vibrational behavior and dynamic response to aerodynamic excitation and stabilize structures that might be damaged in the absence of control. Various active feedback control schemes tuned by optimal proportional-derivative (PD) controller are implemented. The excellent control effect is not only confirmed by the time response with its vibration amplitude greatly suppressed but also confirmed by the frequency change and comparison. The research provides a way for rare study of amplitude suppression of stall nonlinear aeroelastic effect of thin-walled composite blade with CAS configuration and piezoelectric patches embedded.

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Experimental study on the influence of centroid position of wind turbine section on flutter

Zheng,

Gao,

Zhao

et al. 2024

Heliyon

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Experimental evidence of coupled-mode flutter in a two-meter-long non-rotating wind turbine blade

Cited by 3 publications

References 22 publications

Numerical Investigation of Aerodynamic Performances for NREL 5-MW Offshore Wind Turbine

Numerical Investigation of Aerodynamic Performances for NREL 5-MW Offshore Wind Turbine

Stall nonlinear aeroelastic effects and active control of thin-walled composite blade with piezoelectric patches embedded

Experimental study on the influence of centroid position of wind turbine section on flutter

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