Fluid–structure interaction analysis of a morphing vertical axis wind turbine

MacPhee, David; Beyene, Asfaw

doi:10.1016/j.jfluidstructs.2015.10.010

Cited by 59 publications

(29 citation statements)

References 32 publications

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“…• At λ=2 a significant improvement in the delivered thrust is observed when using the most flexible foil. This is in accordance with McPhee and Beyene [25] who studied a threebladed vertical-axis wind turbine numerically and reported a significant improvement of the rotor efficiency. The most flexible blade provided the highest improvement.…”

Section: Discussionsupporting

confidence: 92%

“…Flexible compound structures can naturally reproduce this effect by adapted stiffness which can be set by design. This was demonstrated experimentally and numerically by McPhee and Beyene, first for horizontal-axis wind turbines [24], later also for vertical-axis wind turbines through numerical analysis, with promising results [25]. VAWT is a challenging task for numerical simulations.…”

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confidence: 95%

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Characteristics of the fluid–structure interaction within Darrieus water turbines with highly flexible blades

Hoerner

Abbaszadeh

Maı̂tre³

et al. 2019

Journal of Fluids and Structures

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acteristics of the fluid-structure interaction within Darrieus water turbines with highly flexible blades.Vertical-axis water turbines (VAWT), the target of the present study, provide a higher area-based power density when used in arrays, and are a promising alternative to horizontal-axis hydro-kinetic turbines (HAWT). Nevertheless, they operate under highly dynamic conditions near or even beyond dynamic stall at their best-efficiency-point. The abrupt loss of lift and strong increase of drag associated with hydrofoil stall can produce cyclic loads and possible damage of turbomachines due to material fatigue.The effect of flexible structures in a highly dynamic flow regime including separation and stall is here studied systematically in an experimental setup which permits observations of all regimes ranging from quasi-static state up to the occurrence of deep dynamic stall and beyond. The process is studied using a surrogate model consisting of an oscillating NACA0018 hydrofoil in a closed water channel, following a motion law comparable to the real angle of incidence of a Darrieus turbine blade along its rotation. The investigated parameters are the oscillation frequency and tip speed ratio, for one rigid as well as for three flexible hydrofoils of different stiffnesses. The coupling process is therefore investigated for multiple machine designs and working points. Lift and drag measurements have been carried out in a systematic manner.Results show that at tip speed ratios for which highly dynamic flow regimes occur, flexible blades provide not only higher thrust, but also reduced normal forces and reduced peak-to-peak cyclic normal force variations. This reduction of stress loads would translate into significantly increased turbine lifetime. This supports the need for further investigations in order to identify optimal blade flexibility and check further turbine designs.

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Section: Discussionsupporting

confidence: 92%

mentioning

confidence: 95%

Characteristics of the fluid–structure interaction within Darrieus water turbines with highly flexible blades

Hoerner

Abbaszadeh

Maı̂tre³

et al. 2019

Journal of Fluids and Structures

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show abstract

“…Generally, wind turbines are categorized as horizontal-axis wind turbines (HAWTs), or vertical-axis wind turbines (VAWTs) depending on their axis of rotation [5]. Horizontal-axis wind turbines are usually more efficient, and are used for power production on a national level [6]. However, these turbines require complex yaw mechanisms and intricate blade manufacturing techniques, which make them much more expensive [7].…”

Section: Introductionmentioning

confidence: 99%

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

2019

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This work presents an optimized design of a dynamic rotor vertical-axis wind turbine (DR VAWT) which maximizes the operational tip-speed ratio (TSR) range and the average power coefficient (Cp) value while maintaining a low cut-in wind velocity. The DR VAWT is capable of mimicking a Savonius rotor during the start-up phase and transitioning into a Darrieus one with increasing rotor radius at higher TSRs. The design exploits the fact that with increasing rotor radius, the TSR value increases, where the peak power coefficient is attained. A 2.5D improved delayed detached eddy simulation (IDDES) approach was adopted in order to optimize the dynamic rotor design, where results showed that the generated blades’ trajectories can be readily replicated by simple mechanisms in reality. A thorough sensitivity analysis was conducted on the generated optimized blades’ trajectories, where results showed that they were insensitive to values of the Reynolds number. The performance of the DR VAWT turbine with its blades following different trajectories was contrasted with the optimized turbine, where the influence of the blade pitch angle was highlighted. Moreover, a cross comparison between the performance of the proposed design and that of the hybrid Savonius–Darrieus one found in the literature was carefully made. Finally, the effect of airfoil thickness on the performance of the optimized DR VAWT was thoroughly analyzed.

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“…Liu [7] calculated the natural frequency of blade-cabin-tower coupling system and analyzed the wind vibration under random wind load. Macphee et al [8] used a finite volume fluid-structure interaction algorithm to simulated a rigid VAWT, which was with good agreement with existing experimental data, and then was compared to several other geometrically identical morphing designs with varying material flexibility. Zhou et al [9] investigated the static and fatigue properties of the composite wind turbine blade under random ocean loads.…”

Section: Introductionmentioning

confidence: 93%

Influences of wind and rotating speed on the fluid-structure interaction vibration for the offshore wind turbine blade

Shi¹,

Wang²,

Zhang³

et al. 2019

J. vibroeng.

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For the 5MW offshore wind turbine blade, the control and discrete equations of the fluid domain and structural domain were established respectively, and the calculation formulas of blade loads and damping coefficient were given. Furthermore, the blade entity modeling was completed by using UG and ANSYS Workbench. Based on it, the numerical calculation of blade vibration characteristics under different wind and rotating speeds was carried out, and the reliability verification was conducted by the wind tunnel test. The results of calculation indicate that the numerical results of the first principal stresses at the blade surface along the span-wise direction are consistent with the results of wind tunnel test, which verifies the reliability of the theory and numerical models. Both the influences of the bidirectional fluid-structure interaction (BFSI) and the rotation effect on the characteristics of blade vibration should be underlined. The increase of wind or rotating speed results in the nonlinear increase of the maximum span-wise displacement of the blade and of the Mises-stresses. Under different wind or rotating speed, the blade's maximum displacement occurs at its tip, its maximum Mises-stresses appear at the relative wingspan of 0.55, and the contribution of rotating speed and average wind speed to the displacement or Mises-stress along the span-wise direction is similar.

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Fluid–structure interaction analysis of a morphing vertical axis wind turbine

Cited by 59 publications

References 32 publications

Characteristics of the fluid–structure interaction within Darrieus water turbines with highly flexible blades

Characteristics of the fluid–structure interaction within Darrieus water turbines with highly flexible blades

A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability

Influences of wind and rotating speed on the fluid-structure interaction vibration for the offshore wind turbine blade

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