Experimental study of the effective parameters on the offshore wind turbine's airfoil in pitching case

Mamouri, Amir Reza; Khoshnevis, Abdolamir Bak; Lakzian, Esmail

doi:10.1016/j.oceaneng.2020.106955

Cited by 20 publications

(10 citation statements)

References 48 publications

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“…The 2.5 MW Eolos wind turbine with rotor diameter D = 96 m and hub height z h = 80 m, at the University of Minnesota, was employed in the present work. Because of proprietary reasons, the blade data, such as the airfoil type, lift and drag coefficients, which are important parameters for a wind turbine [77], cannot be provided in this paper. The readers can contact the Eolos Wind Research station at the University of Minnesota for these data.…”

Section: Simulation Set-upsmentioning

confidence: 99%

Large-Eddy Simulation of Wakes of Waked Wind Turbines

Liu

Yang

et al. 2022

Energies

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The wake dynamics of a wind turbine are influenced by the atmospheric turbulence and the wake of its upwind turbine. In this work, we investigate the wake characteristics of a waked wind turbine for four different downwind spacings and three different inflows using large-eddy simulation with a turbine parameterized using the actuator surface model. The wake statistics of the waked turbine are compared with those of the stand-alone wind turbine under the same inflow. The results show that the oncoming wake significantly affects the near wake of the waked turbine, where it accelerates the wake recovery by increasing the turbulent convection, and increases the turbulence kinetic energy. The velocity deficit and turbulence kinetic energy in the far wake, on the other hand, are fairly similar with each other for the considered different turbine spacings, and are close to those of the stand-alone wind turbine. As for the wake meandering of the waked wind turbines, it is initiated quickly and enhanced by the oncoming wake turbulence, as shown by the meandering amplitudes and the power spectral density of the instantaneous wake positions. The growth rates of the wake meandering from the waked wind turbines, on the other hand, are close to that of the stand-alone wind turbine, indicating the critical role of the atmospheric turbulence on wake meandering. The present work details how the oncoming wake influences the wake dynamics of the downwind turbine, and provides physical insights on developing engineering models to take into account such effects.

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Section: Simulation Set-upsmentioning

confidence: 99%

Large-Eddy Simulation of Wakes of Waked Wind Turbines

Liu

Yang

et al. 2022

Energies

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“…At this moment, the pressure of static baseline airfoil on the suction surface tends to be flattened. While the flow was still attached to the surface in dynamic conditions, this was due to the transient variation of the leading stall vortex and the so-called effects of boundary layer improvement [23,24]. The suction surface has more momentum to resist the adverse pressure gradient in dynamic conditions, enabling the boundary layer to withstand greater flow separation than static conditions.…”

Section: Surface Pressure Characteristicsmentioning

confidence: 99%

“…Consequently, the instantaneous pressure was obtained at the flow separation, reattachment and vortex formation states. Mamouri et al [23] analyzed various parameters affecting the aerodynamic coefficient of the dynamic stall by using two load cells, including reduced frequency, α mean , pitching amplitude and Re. Subsequently, the experimental airfoil was optimized to make it more suitable for the dynamic stall condition.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of a Gurney Flap on a Pitching Wind Turbine Airfoil under Turbulent Flow Conditions

Yang

Wang

et al. 2022

JMSE

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The present work aimed to investigate the aerodynamic characteristics of a pitching wind turbine airfoil with a Gurney flap under turbulent inflow. Experiments were carried out for the DTU-LN221 offshore wind turbine airfoil under different turbulence levels at Reynolds number 105 order of magnitude by replacing the grilles in the wind tunnel. The dynamic stall characteristics were analyzed by measuring surface pressure and near-wake flow field. The pressure results demonstrated that with the increase of turbulence intensity, the differences in lift hysteresis loops between baseline airfoil and flapped airfoil became smaller. With the turbulence intensity from 0.5% to 10.18%, the maximum lift increment of the Gurney flap decreased from 14.32% to 4.34% (i.e., 0–20° pitching oscillation). In a more extensive range of oscillation, the capability for the lift-improvement dropped down a bit more (i.e., 0–25°). A brief aerodynamic damping analysis indicated that the Gurney flap was more stable in turbulent conditions than the baseline airfoil. Besides, hysteresis loops of the wake were analyzed to compare the difference between the flapped airfoil and the baseline airfoil. Unlike the studies of static airfoils, the results may help better understand the dynamic characteristics of offshore wind turbines with Gurney flaps for practical situations.

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“…In another work, Mamouri et al [ 9 ] examined the entropy generation of three offshore wind turbine airfoils at various angles of attack, revealing that flow separation has a large impact on the viscous entropy generation rate and that the SD7062 airfoil has the lowest entropy generation rate at large angles of attack. Mamouri et al [ 10 ] examined the aerodynamic coefficients of an oscillating wind turbine airfoil by conducting experiments and focusing on the effective parameters that affect the lift and drag coefficients in the blades, showing that a more suitable airfoil could be chosen based on the wind turbine’s rotation frequency. Suresh and Rajakumar [ 11 ] investigated 10 different types of airfoils for a maximum power coefficient with respect to the angle of attack and wind speed.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Experimental Investigation of 3D Printed Micro Wind Turbine Blade Made of PLA Material

Arivalagan¹,

Rajakumar

Čep

et al. 2023

Materials

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This paper presents the design, development, and optimization of a 3D printed micro horizontal axis wind turbine blade made of PLA material. The objective of the study was to produce 100 watts of power for low-wind-speed applications. The design process involved the selection of SD7080 airfoil and the determination of the material properties of PLA and ABS. A structural analysis of the blade was carried out using ANSYS software under different wind speeds, and Taguchi’s L16 orthogonal array was used for the experiments. The deformation and equivalent stress of the PLA material were identified, and the infill percentage and wind speed velocity were optimized using the moth-flame optimization (MFO) algorithm. The results demonstrate that PLA material has better structural characteristics compared to ABS material. The optimized parameters were used to fabricate the turbine blades using the fusion deposition modeling (FDM) technique, and they were tested in a wind tunnel.

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Experimental study of the effective parameters on the offshore wind turbine's airfoil in pitching case

Cited by 20 publications

References 48 publications

Large-Eddy Simulation of Wakes of Waked Wind Turbines

Large-Eddy Simulation of Wakes of Waked Wind Turbines

Experimental Study of a Gurney Flap on a Pitching Wind Turbine Airfoil under Turbulent Flow Conditions

Optimization and Experimental Investigation of 3D Printed Micro Wind Turbine Blade Made of PLA Material

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