Aero-Elastic Optimization of a 10 MW Wind Turbine

Zahle, Frederik; Tibaldi, Carlo; Verelst, David Robert; Bak, Christian; Bitsche, Robert; Blasques, José Pedro Albergaria Amaral

doi:10.2514/6.2015-0491

Cited by 35 publications

(24 citation statements)

References 15 publications

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“…Large wind turbines and their related wind farms have many challenges in aerodynamics, aero-elasticity and aero-acoustics. Therefore, the introduction of new designs and upgrading methods will be also needed to make this possible [1,2].…”

Section: Introductionmentioning

confidence: 99%

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

et al. 2018

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Vortex generators (VGs) are increasingly used in the wind turbine manufacture industry as flow control devices to improve rotor blade aerodynamic performance. Nevertheless, VGs may produce excess residual drag in some applications. The so-called sub-boundary layer VGs can provide an effective flow-separation control with lower drag than the conventional VGs. The main objective of this study is to investigate how well the simulations can reproduce the physics of the flow of the primary vortex generated by rectangular sub-boundary layer VGs mounted on a flat plate with a negligible pressure gradient with an angle of attack of the vane to the oncoming flow of β = 18 • . Three devices with aspect ratio values of 2, 2.5 and 3 are qualitatively and quantitatively compared. To that end, computational simulations have been carried out using the RANS (Reynolds averaged Navier-Stokes) method and at Reynolds number Re = 2600 based on the boundary layer momentum thickness θ at the VG position. The computational results show good agreement with the experimental data provided by the Advanced Aerodynamic Tools of Large Rotors (AVATAR) European project for the development and validation of aerodynamic models. Finally, the results indicate that the highest VG seems to be more suitable for separation control applications.

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Section: Introductionmentioning

confidence: 99%

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

et al. 2018

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“…The LTI representation is far less computational demanding than retrieving such characterization from time marching simulations. The LTI model of the smart rotor response, combined with a method for fatigue estimation in the frequency domain , would thus be particularly attractive for concurrent design and optimization applications .…”

Section: Resultsmentioning

confidence: 99%

“…The model is integrated in an analytically derived full‐order linear aeroelastic model, as implemented in the code HAWCStab2 , and returns a high‐fidelity linear time‐invariant (LTI) model of the aero‐servo‐elastic response of a smart rotor with flaps. The LTI state‐space model provides a convenient linear representation of the turbine response, which can be used for control design and tuning, for synthesis of modeled‐based controller, and could be integrated in concurrent design and optimization procedures .…”

Section: Introductionmentioning

confidence: 99%

High‐fidelity linear time‐invariant model of a smart rotor with adaptive trailing edge flaps

Bergami

Hansen²

2016

Wind Energy

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A high-fidelity linear time-invariant model of the aero-servo-elastic response of a wind turbine with trailing-edge flaps is presented and used for systematic tuning of an individual flap controller. The model includes the quasi-steady aerodynamic effects of trailing-edge flaps on wind turbine blades and is integrated in the linear aeroelastic code HAWCStab2. The dynamic response predicted by the linear model is validated against non-linear simulations, and the quasi-steady assumption does not cause any significant response bias for flap deflection with frequencies up to 2-3 Hz. The linear aero-servo-elastic model support the design, systematic tuning and model synthesis of smart rotor control systems. As an example application, the gains of an individual flap controller are tuned using the Ziegler-Nichols method for the full-order poles. The flap controller is based on feedback of inverse Coleman transformed and low-pass filtered flapwise blade root moments to the cyclic flap angles through two proportional-integral controllers. The load alleviation potential of the active flap control, anticipated by the frequency response of the linear closed-loop model, is also confirmed by non-linear time simulations. The simulations report reductions of lifetime fatigue damage up to 17% at the blade root and up to 4% at the tower bottom.

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“…The engine of the algorithm is the internal cost models which recursively computes the COE by taking information from the various modules. A similar project, also based on OpenMDAO, has been recently developed by Zahle et al [25]. The structure of the information flow basically allows to conduct a full aero-structural optimization of large wind turbines, and the simulation environment is widely based on internally developed software.…”

Section: State Of the Art In The Multidisciplinary Design Of Wind Turmentioning

confidence: 99%

A Research Framework for the Multidisciplinary Design and Optimization of Wind Turbines

Sartori¹,

Cacciola²,

Croce³

et al. 2020

Design Optimization of Wind Energy Conversion Systems With Applications

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The design of very large wind turbines is a complex task which requires the development of dedicated tools and techniques. In this chapter, we present a system-level design procedure based on the combination of multi-body numerical models of the turbine and a multilevel optimization scheme. The overall design aims at the minimization of the cost of energy (COE) through the optimization of all the characteristics of the turbine, and the procedure automatically manages all the simulations required to compute relevant loads and displacements. This unique setup allows the designer to conduct trade-off studies in a highly realistic virtual environment and is an ideal test bench for advanced research studies in which it is important to assess the economic impact of specific design choices. Examples of such studies include the impact of stall-induced vibrations on fatigue, the development of active/passive control laws for large rotors, and the complete definition of 10-20 MW reference turbines.

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Aero-Elastic Optimization of a 10 MW Wind Turbine

Cited by 35 publications

References 15 publications

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

Computational Modelling of Rectangular Sub-Boundary Layer Vortex Generators

High‐fidelity linear time‐invariant model of a smart rotor with adaptive trailing edge flaps

A Research Framework for the Multidisciplinary Design and Optimization of Wind Turbines

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