Vertical axis wind turbine in a falling soap film

Araya, Daniel; Dabiri, John O.

doi:10.1063/1.4930912

Cited by 13 publications

(7 citation statements)

References 9 publications

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“…This causes the VAWT dynamic stall. Dynamic stall will bring about VAWT structure vibration, noise, and efficiency reduction [6]. VAWT dynamic stall is a complex unsteady flow phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Stall of a Vertical-Axis Wind Turbine and Its Control Using Plasma Actuation

Wang

Zhu

et al. 2019

Energies

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In this paper, a dynamic stall control scheme for vertical-axis wind turbine (VAWT) based on pulsed dielectric-barrier-discharge (DBD) plasma actuation is proposed using computational fluid dynamics (CFD). The trend of the wind turbine power coefficient with the tip speed ratio is verified, and the numerical simulation can describe the typical dynamic stall process of the H-type VAWT. The tangential force coefficient and vorticity contours of the blade are compared, and the regular pattern of the VAWT dynamic stall under different tip speed ratios is obtained. Based on the understanding the dynamic stall phenomenon in flow field, the effect of the azimuth of the plasma actuation on the VAWT power is studied. The results show that the azimuth interval of the dynamic stall is approximately 60° or 80° by the different tip speed ratio. The pulsed plasma actuation can suppress dynamic stall. The actuation is optimally applied for the azimuthal position of 60° to 120°.

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“…This causes the VAWT dynamic stall. Dynamic stall will bring about VAWT structure vibration, noise, and efficiency reduction [6]. VAWT dynamic stall is a complex unsteady flow phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Stall of a Vertical-Axis Wind Turbine and Its Control Using Plasma Actuation

Wang

Zhu

et al. 2019

Energies

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“…Dynamic stall is associated with the rapidly changing angle of attack experienced by the turbine blades during turbine rotation, and it may induce structural vibration, reduce efficiency and increase noise production. It is also has an effect on the dynamics and complexity of the wake of the wind turbine (Barsky 2014;Araya & Dabiri 2015b), although only over limited length scales (Araya, Colonius & Dabiri 2017). The wake effects of vortex shedding have significant practical implications for the operation of wind turbines in arrays (Sarmast et al 2014), with coherent vortex structures having been shown to play a distinctively different role in wake stability and mixing than stochastic turbulent fluctuations (Lignarolo et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Dynamic stall in vertical axis wind turbines: scaling and topological considerations

Buchner

Soria

Honnery³

et al. 2018

J. Fluid Mech.

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Vertical axis wind turbine blades are subject to rapid, cyclical variations in angle of attack and relative airspeed which can induce dynamic stall. This phenomenon poses an obstacle to the greater implementation of vertical axis wind turbines because dynamic stall can reduce turbine efficiency and induce structural vibrations and noise. This study seeks to provide a more comprehensive description of dynamic stall in vertical axis wind turbines, with an emphasis on understanding its parametric dependence and scaling behaviour. This problem is of practical relevance to vertical axis wind turbine design but the inherent coupling of the pitching and velocity scales in the blade kinematics makes this problem of more broad fundamental interest as well. Experiments are performed using particle image velocimetry in the vicinity of the blades of a straight-bladed gyromill-type vertical axis wind turbine at blade Reynolds numbers of between 50 000 and 140 000, tip speed ratios between $\unicode[STIX]{x1D706}=1$ to $\unicode[STIX]{x1D706}=5$, and dimensionless pitch rates of $0.10\leqslant K_{c}\leqslant 0.20$. The effect of these factors on the evolution, strength and timing of vortex shedding from the turbine blades is determined. It is found that tip speed ratio alone is insufficient to describe the circulation production and vortex shedding behaviour from vertical axis wind turbine blades, and a scaling incorporating the dimensionless pitch rate is proposed.

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“…The absence of a yaw mechanism makes VAWTs more suitable in terms of reduced structural complexity and easier power production. However, the main drawback of VAWT includes the absence of self-start-up ability and smaller aerodynamic performance [65][66][67][68]. The merits that attract interest in installing VAWT are summarized as [69][70][71][72][73]:…”

Section: Categories Of Wind Turbinementioning

confidence: 99%

Principle Parameters and Environmental Impacts that Affect the Performance of Wind Turbine: An Overview

Bashir

2021

Arab J Sci Eng

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Vertical axis wind turbine in a falling soap film

Cited by 13 publications

References 9 publications

Dynamic Stall of a Vertical-Axis Wind Turbine and Its Control Using Plasma Actuation

Dynamic Stall of a Vertical-Axis Wind Turbine and Its Control Using Plasma Actuation

Dynamic stall in vertical axis wind turbines: scaling and topological considerations

Principle Parameters and Environmental Impacts that Affect the Performance of Wind Turbine: An Overview

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