Vortex-induced vibrations on a modern wind turbine blade

Heinz, Joachim Christian; Sørensen, Niels N.; Zahle, Frederik; Skrzypiński, Witold Robert

doi:10.1002/we.1967

Cited by 64 publications

(39 citation statements)

References 10 publications

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“…Manolesos et al [13] observed experimentally that such stall cells "... are unstable, display no discernable periodicity, and seem to change position arbitrarily in the spanwise direction". Heinz et al [14] used CFD to investigate the interaction of coherent structures with elastic wind turbine blades in deep stall. Their results indicate that inclination of the blade with respect to the free stream velocity might correlate the individual sections' shedding frequencies.…”

Section: Interaction Between Sections: Wake Modelling and Three-dimenmentioning

confidence: 99%

Stall-Induced Vibrations of the AVATAR Rotor Blade

Stettner¹,

Reijerkerk²,

Lünenschloß³

et al. 2016

J. Phys.: Conf. Ser.

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Section: Interaction Between Sections: Wake Modelling and Three-dimenmentioning

confidence: 99%

Stall-Induced Vibrations of the AVATAR Rotor Blade

Stettner¹,

Reijerkerk²,

Lünenschloß³

et al. 2016

J. Phys.: Conf. Ser.

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“…Carrión et al [4] applied a CFD-CSD method to perform aeroelastic analysis on NREL and MEXICO wind turbines where flapwise and edgewise instabilities were studied. Recently, Heinz et al [5] conducted a high-fedility study on the blade of the reference wind turbine DTU 10 MW to investigate the aeroelastic response in deep stall conditions using HAWC2CFD tool [6]. Dose et al [7] coupled OpenFOAM to an in-house structural beam solver to investigate the aeroelasticity of the NREL 5MW wind turbine blade at high wind speeds.…”

Section: Introductionmentioning

confidence: 99%

Numerical Fluid-Structure Interaction Study on the NREL 5MW HAWT

Halawa

Sessarego

Shen

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. The development of reliable Fluid-Structure Interaction (FSI) simulation tools and models for the wind turbines is a critical step in the design procedure towards achieving optimized large wind turbine structures. Such approach will mitigate the aeroelastic instabilities like: torsional flutter, stall flutter and edgewise instability that introduce extra stresses to the turbine structure leading to reduced life time and substantial failures. In this study, FSI simulations were held using the commercial package Ansys v18.2 solvers as a preliminary step towards our on-going development of a reliable Open-Source solver. These simulations were applied to the full-scale rotor blades of the NREL 5MW reference horizontal axis wind turbine. The aerodynamic loads and structural responses computations were carried out using a steady-state FSI analysis. The computations were run on the Kyushu University multicore Linux cluster using the public domain openMPI implementation of the standard message passing interface (MPI). Finally, the results were validated against the Technical University of Denmark's (DTU) MIRAS aeroelastic code results as well as the widely used FLEX5-Q 3 UIC and FAST codes in different cases showing reasonable agreement. IntroductionThe increased potential for the extraction of wind energy has led to a considerable development in the wind turbines designs. The turbine blades are getting larger and thus introducing new load effects. The flexibility of large wind turbines yields an interaction between the fluid flow and the internal structure loading causing what is known as Fluid-Structure Interaction (FSI) or aeroelastic effects. The consequences of these effects are many instability problems like torsional flutter, stall flutter and edgewise instability imposing extra stresses on the blade structure through fatigue loads that potentially end up to wind turbine failures. Hence, developing reliable FSI simulation tools and models for the blades of wind turbines is a critical step towards developing and optimizing the large wind turbines designs. Many recent studies are centered around the FSI development. Hsu and Bazilevs [1] simulated a full scale turbine using a fully coupled 3D FSI approach by a low order FEM-based ALE-VMS technique. Rafiee et al.[2] investigated the aeroelastic behavior using modified BEM and CFD then constructed an iterative FSI approach. Wang et al. [3] established an FSI model using CFD and FEA with one-way coupling interface between them. Carrión et al.[4] applied a CFD-CSD method to perform aeroelastic

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“…Typical section analysis showed that lock-on at the vortex shedding frequency is likely to occur depending on the amplitude of the lead-lag motion undergone by the section. Finally, Heinz et al (2016) and Skrzypinski et al (2016) analyzed the full blade configuration at 90 • AOA using a DES aerodynamic model coupled to a nonlinear beam model of the blade. The analyses showed that at certain azimuth positions of the parked blade when the inflow has a significant velocity component along the blade axis, spanwise-correlated vortex shedding over large parts of the blade can be triggered, which eventually leads to excessive VIV.…”

Section: Introductionmentioning

confidence: 99%

Aeroelastic stability of idling wind turbines

Wang¹,

Riziotis

Voutsinas

2017

Wind Energ. Sci.

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Abstract. Wind turbine rotors in idling operation mode can experience high angles of attack within the poststall region that are capable of triggering stall-induced vibrations. The aim of the present paper is to extend the existing knowledge on the dynamics and aerodynamics of an idling wind turbine and characterize its stability. Rotor stability in slow idling operation is assessed on the basis of nonlinear time domain and linear eigenvalue analyses. The aim is to establish when linear analysis is reliable and identify cases for which nonlinear effects are significant. Analysis is performed for a 10 MW conceptual wind turbine designed by DTU. First, the flow conditions that are likely to favor stall-induced instabilities are identified through nonlinear time domain aeroelastic simulations. Next, for the above specified conditions, eigenvalue stability analysis is performed to identify the low damped modes of the turbine. The eigenvalue stability results are evaluated through computations of the work done by the aerodynamic forces under imposed harmonic motion following the shape and frequency of the various modes. Nonlinear work characteristics predicted by the ONERA and Beddoes-Leishman (BL) dynamic stall models are compared. Both the eigenvalue and work analyses indicate that the asymmetric and symmetric out-of-plane modes have the lowest damping. The results of the eigenvalue analysis agree well with those of the nonlinear work analysis and the time domain simulations.

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Vortex-induced vibrations on a modern wind turbine blade

Cited by 64 publications

References 10 publications

Stall-Induced Vibrations of the AVATAR Rotor Blade

Stall-Induced Vibrations of the AVATAR Rotor Blade

Numerical Fluid-Structure Interaction Study on the NREL 5MW HAWT

Aeroelastic stability of idling wind turbines

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