A retrospective of VAWT technology.

Ashwill, Thomas D.; Sutherland, Herbert J.; Berg, Dale E.

doi:10.2172/1035336

Cited by 32 publications

(21 citation statements)

References 15 publications

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“…Recently, a small type of vertical axis wind turbine (VAWT) has attracted the attention of many researchers due to its power coefficient being less affected by the high turbulence intensity in the urban environment. Meanwhile, its noise is very low because of the low tip speed ratio [2][3][4][5]. However, the resultant velocity to blade and the angle of attack can change periodically with the azimuth angle θ, and the blade will generate dynamic stalls and tip vortexes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades

et al. 2017

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Abstract:Wind velocity distribution and the vortex around the wind turbine present a significant challenge in the development of straight-bladed vertical axis wind turbines (VAWTs). This paper is intended to investigate influence of tip vortex on wind turbine wake by Computational Fluid Dynamics (CFD) simulations. In this study, the number of blades is two and the airfoil is a NACA0021 with chord length of c = 0.265 m. To capture the tip vortex characteristics, the velocity fields are investigated by the Q-criterion iso-surface (Q = 100) with shear-stress transport (SST) k-ω turbulence model at different tip speed ratios (TSRs). Then, mean velocity, velocity deficit and torque coefficient acting on the blade in the different spanwise positions are compared. The wind velocities obtained by CFD simulations are also compared with the experimental data from wind tunnel experiments. As a result, we can state that the wind velocity curves calculated by CFD simulations are consistent with Laser Doppler Velocity (LDV) measurements. The distribution of the vortex structure along the spanwise direction is more complex at a lower TSR and the tip vortex has a longer dissipation distance at a high TSR. In addition, the mean wind velocity shows a large value near the blade tip and a small value near the blade due to the vortex effect.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades

et al. 2017

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“…The airfoils are affected greatly by the stall as the variation of windspeed causes a heavy turbulence around them. On one side the varying stall onset is higher rather than on the other side [20]. This causes delay on the beginning movement of the blades and the reattachment of the airflow is also affected.…”

Section: Comparison Between Hawt and Vawtmentioning

confidence: 95%

Roadside Vertical Axis Wind Turbine (VAWT): An Effective Evolutionary Design for Australian Highway Commuters with Minimum Dynamic Stall

Ahmad¹,

Loya²,

Ali³

et al. 2020

ENG

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There are multiple approaches of design for Vertical Axis Wind Turbines (VAWT) that have been studied by engineers and leaps have been made in high performing innovations. By harnessing the energy from these wind turbines, the problem of roadside lights shortage can be solved. This can help to prevent the accidents while providing clean energy. The importance of coastal areas like Australian beaches regarding wind turbines cannot be neglected as a higher number of people like to live near coastal vicinity. Also, most of the freeways in Australia expand across the sea. In this paper, one such design has been analyzed to implement across the highways. But still with many advancements in technology, an immense gap is present in the research of implementation of VAWTs. The design discussed in the current study is a VAWT which can be installed on the side of the highway roads to provide clean and cheap energy for illuminating the roads. Computational Fluid Dynamics (CFD) was conducted on the blades of the turbine to analyze its performance under operating conditions. Furthermore, the paper elaborates the generation of drag and lift on the blades of the turbine. A wind speed of 60 km/h just produced 6.1 N force on the turbine blades as a result of drag. The cost analysis showed the cheap production of such mechanism that can provide longer service when installed.

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“…Vertical axis wind turbines (VAWTs) have received increasing interest in recent years [1][2][3][4][5][6]. Compared with horizontal axis wind turbines (HAWTs), VAWTs exhibit several advantages.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the generator and gearbox of a VAWT can be placed near the ground, which is convenient for maintenance and repair. VAWTs are insensitive to wind direction; therefore, the yaw system is not necessary, thereby greatly decreasing machine complexity [1]. In addition, VAWTs can operate well under high turbulent intensity conditions [2][3][4] and can be placed more compactly in a wind farm [5,6], although different conclusions have been reported [7,8].…”

Section: Introductionmentioning

confidence: 99%

Structural Analysis of Large-Scale Vertical Axis Wind Turbines Part II: Fatigue and Ultimate Strength Analyses

Lin

Xia

2019

Energies

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Vertical axis wind turbines (VAWTs) exhibit many advantages and great application prospect as compared with horizontal ones. However, large-scale VAWTs are rarely reported, and the codes and guidelines for designing large-scale VAWTs are lacking. Designing a large-scale composite blade requires precise finite element (FE) modeling and stress analysis at the lamina level, while precise modeling of an entire VAWT is computationally intensive. This study proposes a comprehensive fatigue and ultimate strength analysis framework for VAWTs. The framework includes load determination, finite element (FE) model establishment, and fatigue and ultimate strength analyses. Wind load determination has been presented in the companion paper. In this study, laminated shell elements are used to model blades, which are separately analyzed by ignoring the influence of the tower and arms. Meanwhile, beam elements are used to model an entire VAWT to conduct a structural analysis of other structural components. A straight-bladed VAWT in Yang Jiang, China, is used as a case study. The critical locations of fatigue and ultimate strength failure of the blade, shaft, arms, and tower are obtained.

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A retrospective of VAWT technology.

Cited by 32 publications

References 15 publications

Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades

Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades

Roadside Vertical Axis Wind Turbine (VAWT): An Effective Evolutionary Design for Australian Highway Commuters with Minimum Dynamic Stall

Structural Analysis of Large-Scale Vertical Axis Wind Turbines Part II: Fatigue and Ultimate Strength Analyses

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