3D CFD simulation and parametric study of a flat plate deflector for vertical axis wind turbine

Wong, Kok Hoe; Chong, Wen Tong; Poh, Sin Chew; Shiah, Yui‐Chuin; Sukiman, Nazatul Liana; Wang, Chin‐Tsan

doi:10.1016/j.renene.2018.05.085

Cited by 81 publications

(35 citation statements)

References 31 publications

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“…For this reason, many devices are proposed to enhance the performance of VAWTs. For example, Wong et al [22,23] studied the influence of a flat plate deflector, which is placed upstream, on the performance of VAWTs. Due to the flat plate, the free flow accelerated and was deflected by the deflector before impinging on the turbine and thus the rotor's power coefficient is enhanced.…”

Section: Current Study On Vawtsmentioning

confidence: 99%

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Zhang

Elsakka

Huang

et al. 2019

Energy Conversion and Management

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Vertical axis wind turbines (VAWTs) have been attracting an increasing attention in recent years because of their potential for effectively using wind energy. The tip vortices from the VAWT blades have a negative impact on the power efficiency. Since a winglet has been proved to be effective in decreasing the tip vortex in the aerospace field, this paper numerically studies the aerodynamic effect of appending a winglet on the blade of a VAWT. Based on the theoretical motion pattern of the VAWT blade, this paper simplifies the three-dimensional fullscale rotor simulation to a one-blade oscillating problem in order to reduce the computational cost. The full rotor model simulation is also used in validating the result. The numerical approach has been validated by the experimental data that is available in the open literature. Six parameters are applied in defining the configuration of the winglet. The orthogonal experimental design (OED) approach is adopted in this paper to determine the significance of the design parameters that affect the rotor's power coefficient. The OED results show that the twist angle of the winglet is the most significant factor that affects the winglet's performance. A range analysis of the OED results produces an optimal variable arrangement in the current scope, and the winglet's performance in this variable arrangement is compared with the blade without a winglet. For the single blade study, the comparison result shows that the optimal 2 winglet can decrease the tip vortices and improve the blade's power performance by up to 31% at a tip speed ratio of 2.29. However, for the full VAWT case, the relative enhancement in the power coefficient is about 10.5, 6.7, and 10.0% for TSRs of 1.85, 2.29, and 2.52, respectively. The winglet assists in maintain the pressure difference between the two sides of the blade, thus weakening the tip vortex and improving the aerodynamic efficiency of the surface near the blade tip.

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Section: Current Study On Vawtsmentioning

confidence: 99%

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Zhang

Elsakka

Huang

et al. 2019

Energy Conversion and Management

View full text Add to dashboard Cite

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“…It is important and necessary to choose a suitable turbulence model for numerical simulation. A large number of scholars [36][37][38][39] have used k-ω SST model to solve VAWT problems. Therefore, this paper does not perform additional verification on the turbulence model.…”

Section: Cfd Validationmentioning

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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“…The authors proposed to install a small rod in front of the leading edge of the symmetrical NACA 0018 airfoil. Wong et al [44] performed a 3-D numerical analysis of a rotor having straight blades with NACA 0021 airfoils. They studied the effects of a flat plate deflector placed upwind of the vertical wind turbine.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a H-Darrieus Wind Turbine for a Series of 4-Digit NACA Airfoils

2020

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The purpose of this paper is to estimate the H-Darrieus wind turbine aerodynamic performance, aerodynamic blade loads, and velocity profiles downstream behind the rotor. The wind turbine model is based on the rotor designed by McDonnell Aircraft Company. The model proposed here consists of three fixed straight blades; in the future, this model is planned to be developed with controlled blades. The study was conducted using the unsteady Reynolds averaged Navier–Stokes (URANS) approach with the k-ω shear stress transport (SST) turbulence model. The numerical two-dimensional model was verified using two other independent aerodynamic approaches: a vortex model and the extended version of the computational fluid dynamics (CFD) code FLOWer. All utilized numerical codes gave similar result of the instantaneous aerodynamic blade loads. In addition, steady-state calculations for the applied airfoils were also made using the same numerical model as for the vertical axis wind turbine (VAWT) to obtain lift and drag coefficients. The obtained values of lift and drag force coefficients, for a Reynolds number of 2.9 million, agree with the predictions of the experiment and XFOIL over a wide range of angle of attack. A maximum rotor power coefficient of 0.5 is obtained, which makes this impeller attractive from the point of view of further research. Research has shown that, if this rotor were to work with fixed blades, it is recommended to use the NACA 1418 airfoil instead of the original NACA 0018.

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3D CFD simulation and parametric study of a flat plate deflector for vertical axis wind turbine

Cited by 81 publications

References 31 publications

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

Winglet design for vertical axis wind turbines based on a design of experiment and CFD approach

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

Performance Analysis of a H-Darrieus Wind Turbine for a Series of 4-Digit NACA Airfoils

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