Investigations on the Unsteady Aerodynamic Characteristics of a Horizontal-Axis Wind Turbine during Dynamic Yaw Processes

Wang, Xiaodong; Ye, Zhaoliang; Kang, Shun; Hu, Hui

doi:10.3390/en12163124

Cited by 26 publications

(14 citation statements)

References 34 publications

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“…Two methods can be used to study dynamic stall phenomena: numerical methods [18,19] and wind tunnel experimental methods [20]. Due to the complexity of the VAWT dynamic stall phenomenon, wind tunnel experiments are difficult to capture the full detailed flow field.…”

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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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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“…According to the validation case presented in the Fluent manual, the relative difference of transition onset is very small for 1 < y + < 8 [32]. The mesh used in this study generally satisfies the requirement of low Reynolds number turbulence model [33]. The mesh for the wind turbine rotor is illustrated in Figure 3b.…”

Section: Computational Meshmentioning

confidence: 99%

Numerical Study of Nacelle Wind Speed Characteristics of a Horizontal Axis Wind Turbine under Time-Varying Flow

et al. 2019

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Nacelle wind speed transfer function (NTF) is usually used for power prediction and operational control of a horizontal axis wind turbine. Nacelle wind speed exhibits high instability as it is influenced by both incoming flow and near wake of a wind turbine rotor. Enhanced understanding of the nacelle wind speed characteristics is critical for improving the accuracy of NTF. This paper presents Reynolds-averaged Navier–Stokes (RANS) simulation results obtained for a multi-megawatt wind turbine under both stable and dynamic incoming flows. The dynamic inlet wind speed varies in the form of simplified sinusoidal and superposed sinusoidal functions. The simulation results are analyzed in time and frequency domains. For a stable inlet flow, the variation of nacelle wind speed is mainly influenced by the blade rotation. The influence of wake flow shows high frequency characteristics. The results with stable inlet flow show that the reduction of the nacelle wind speed with respect to the inlet wind speed is overestimated for low wind speed condition, and underestimated for high wind speed condition. Under time-varing inflow conditions, for the time scale and fluctuation amplitude subject to the International Electrotechnical Commission (IEC) standard, the nacelle wind speed is mainly influenced by the dynamic inflow. The variation of inflow can be recovered by choosing a suitable low pass filter. The work in this paper demonstrates the potential for building accurate NTF based on Computational Fluid Dynamics (CFD) simulations and signal analysis.

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“…Figure 3 shows a schematic diagram of the VG geometric parameters. The inflow velocity type is given by Equation (1). The installation angle of the VG is defined as the angle between the VG and the main velocity.…”

Section: Numerical Conditionsmentioning

confidence: 99%

“…Wind power has become an indispensable form of renewable energy and has become the third-largest power source in the world [1]. In order to ensure a sound structural design of wind turbine blades, the aerodynamic performance of the blade root is sacrificed in the design process.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis of the Effect of Vortex Generator Installation Angle on Flow Separation Control

Liu

Zhang

et al. 2019

Energies

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In order to explore the effect of the installation angle of vortex generator (VG) on boundary-layer flow control, the vortex characteristics of plate VG and their effect on the aerodynamic characteristics of an airfoil was studied numerically and using wind tunnel experiments. The effects of five VG installation angles (β) of 10°, 15°, 20°, 25°, and 30° on the characteristics of vortices were studied. The results show that the strength of vortices on the leeward side of VG increases with an increased installation angle until, eventually, the vortex core breaks down. During the downstream development of the VG leading-edge separation vortices, these vortices deviate in the radial direction. The larger the installation angle, the larger this deviation distance in the radial direction becomes. The effects of installation angle on the aerodynamic performance of airfoils were studied in a wind tunnel using the same five VG installation angles. The results show that VG can delay flow separation on the airfoil suction surface, thereby increasing lift and reducing drag. The stall angle of the airfoil with VG was increased by 10°. When the installation angle of the VG was 20°, the maximum lift coefficient of airfoil increased by 48.77%. For an airfoil angle of attack (AoA) of 18°, the drag of the airfoil decreased by 88%, and the lift-drag ratio increased by 1146.04%. Considering the best overall distribution of lift-drag ratio, the positive effect of the VG was found to be when β = 20° and the worst VG effectiveness was observed at β = 30°.

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Investigations on the Unsteady Aerodynamic Characteristics of a Horizontal-Axis Wind Turbine during Dynamic Yaw Processes

Cited by 26 publications

References 34 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

Numerical Study of Nacelle Wind Speed Characteristics of a Horizontal Axis Wind Turbine under Time-Varying Flow

Experimental and Numerical Analysis of the Effect of Vortex Generator Installation Angle on Flow Separation Control

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