Aerodynamic properties of Wind Turbine Towers based on Wind Tunnel Experiments

Fontecha, Robert; Henneke, Bettina; Kemper, Frank; Feldmann, Markus

doi:10.1016/j.proeng.2017.09.557

Cited by 7 publications

(14 citation statements)

References 4 publications

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“…In the case of the tower model, several wind tunnel measurements were performed on cylinders to determine if it was possible to account for Reynolds number effects using surface roughness modifications. As shown in [35,36], this was most efficiently achieved through dimpled patterns, which forced the flow transition to super-critical flow regimes at Reynolds numbers around Re = 4.7 × 10 4 (instead of the typical Reynolds numbers around Re = 5 × 10 5 ). However, achieving super-critical regimes using dimpled patterns in the tower model with approximate diameter D m = 27 mm would require wind speeds around 27 m/s, which are too high for the operation of the rotor model (see Section 3.1).…”

Section: Scale Effectsmentioning

confidence: 95%

“…The measurements were analyzed using spectral methods: the damping and inertial forces were identified through the cross-power spectral density between the measured accelerations and base moments. A more detailed explanation of this proceeding can be found in the literature [18,36]. Equation (8) was further developed to consider circular cross-section structures and sinusoidal motion as follows:…”

Section: Forced Oscillation Measurements Of the Tower Modelmentioning

confidence: 99%

“…Figure 7 shows the measured damping base moments for the different operating conditions along the used excitation frequencies. These moments are obtained after using spectral methods to identify the moment components in phase with the oscillation speed ( [18,19,36]). It was assumed that an adequate expression for the aerodynamic damping forces must have a similar form to those given by Garrad [7], Kühn [8], Valamanesh and Myers [10], and Van der Tempel [11], which have been briefly exposed in Section 2.…”

Section: Forced Oscillation Measurements Of the Wind Turbine Modelmentioning

confidence: 99%

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On the Determination of the Aerodynamic Damping of Wind Turbines Using the Forced Oscillations Method in Wind Tunnel Experiments

2019

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The development of wind turbine technology has led to higher and larger wind turbines with a higher sensitivity to dynamic effects. One of these effects is the aerodynamic damping, which introduces favorable damping forces in oscillating wind turbines. These forces play an important role in the turbine lifetime, but have not yet been studied systematically in detail. Consequently, this paper studies the plausibility of determining the aerodynamic damping of wind turbines systematically through wind tunnel experiments using the forced oscillation method. To this end, a 1:150 scale model of a prototype wind turbine has been fabricated considering Reynolds number effects on the blades through XFOIL calculations and wind tunnel measurements of airfoil 2D-section models. The resulting tower and wind turbine models have been tested for different operation states. The tower results are approximate and show low aerodynamic damping forces that can be neglected on the safe side. The measured aerodynamic damping forces of the operating turbine are compared to existing analytic approaches and to OpenFAST simulations. The measured values, although generally larger, show good agreement with the calculated ones. It is concluded that wind tunnel forced oscillations experiments could lead to a better characterization of the aerodynamic damping of wind turbines.

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Section: Scale Effectsmentioning

confidence: 95%

Section: Forced Oscillation Measurements Of the Tower Modelmentioning

confidence: 99%

Section: Forced Oscillation Measurements Of the Wind Turbine Modelmentioning

confidence: 99%

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On the Determination of the Aerodynamic Damping of Wind Turbines Using the Forced Oscillations Method in Wind Tunnel Experiments

2019

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“…The structural response of steel tubular WT tower can be analyzed by Finite Element Method (FEM) [38]. Also, aerodynamic damping and the crosswind vibrations are investigated on a wind tunnel to determine vortex-shedding correlation lengths and aerodynamic structure coefficients [39].…”

Section: Structural Modelsmentioning

confidence: 99%

Condition monitoring of wind turbine pitch controller: A maintenance approach

et al. 2018

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With the increase of wind power capacity worldwide, researchers are focusing their attention on the operation and maintenance of wind turbines. A proper pitch controller must be designed to extend the life cycle of a wind turbine's blades and tower. The pitch control system has two main, but conflicting, objectives: to maximize the wind energy captured and converted into electrical energy and to minimize fatigue and mechanical load. Four metrics have been proposed to balance these two objectives. Also, diverse pitch controller strategies are proposed in this paper to evaluate these objectives. This paper proposes a novel metrics approach to achieve the conflicting objectives with a maintenance focus. It uses a 100 kW wind turbine as a case study to simulate the proposed pitch control strategies and evaluate with the metrics proposed. The results are showed in two tables due to two different wind models are used.

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“…Also, M. Gkantou et al, 2017 [6] investigated the structural response on tall hybrid onshore wind turbine tower consisting of 60m lattice and 60m tubular structure for Class II 5 MW wind turbine. Robert Fontecha et al, 2017 [7] evaluated the aerodynamic properties of wind turbine tower with wind tunnel experiment. In this manner, Alvarez Anton et al, 2016 [8] proposed the design of a new hybrid tower containing prefabricated quarter circle elements, steel beams and steel tube at the top of the tower whose weight has been reduced by 40% as compared to the traditional full-concrete tower or complete steel tower and Andrew Myers et al, 2016 [9] developed a new technique (Spiral welding) for onsite manufacturing and installation for wind turbine steel tubular towers which completely eradicated the transportation barriers to limited size tower.…”

Section: Introductionmentioning

confidence: 99%

Analytical Displacement Model of Wind Turbine Towers under Loading Conditions

Raikwar¹,

Ahmed²,

Warudkar³

2021

IRJASH

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The goal of this work is in twofold: 1) to determine the directional deformation (deflection) and bending stress of 1.25 MW Suzlon wind turbine tower under loading conditions for different cross-sections through finite element analysis method; 2) to develop and validate the analytical model allowing to estimate same for different cross-sections. Wind shear force has been calculated in the prevailing direction of the wind for tower structures through integral equations, are then used as input for 3dimensional finite element model to compute the tower deflection and bending stress. To improve the estimation of tower deflection, a mathematical model is developed based on cantilever beam theory. Results are then compared with those obtained from numerical analysis method. The wind turbine tower deflection is found maximum at the tip of the structure and increasing with the hub height. Results indicate that the square cross-section tower is superior with respect to tower deflection with a maximum deflection of 0.064 mm. Numerical analysis method is used to verify the results of mathematical tower deflection model showing very less percentage of error. Thus, the new mathematical model has the advantage of estimating the tower deflection by just knowing the average wind speed of a wind farm for any wind turbine tower structure.

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Aerodynamic properties of Wind Turbine Towers based on Wind Tunnel Experiments

Cited by 7 publications

References 4 publications

On the Determination of the Aerodynamic Damping of Wind Turbines Using the Forced Oscillations Method in Wind Tunnel Experiments

On the Determination of the Aerodynamic Damping of Wind Turbines Using the Forced Oscillations Method in Wind Tunnel Experiments

Condition monitoring of wind turbine pitch controller: A maintenance approach

Analytical Displacement Model of Wind Turbine Towers under Loading Conditions

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