Fundamental study on aerodynamic force of floating offshore wind turbine with cyclic pitch mechanism

Li, Qingan; Kamada, Y.; Maeda, Takao; Murata, Junsuke; Iida, Kohei; Okumura, Yuta

doi:10.1016/j.energy.2016.01.049

Cited by 51 publications

(20 citation statements)

References 23 publications

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“…The torque coefficient and power coefficient acting on the single blade Figure 8 illustrates the correction system for the high-speed multiport pressure device. More detailed experimental parameters have been introduced in the previous studies of Li et al [10,19,24,34,35]. VAWT was measured by a torque meter, and then the utilization rate of wind energy (power coefficient) was investigated.…”

Section: Methodsmentioning

confidence: 99%

Effect of Blade Pitch Angle on the Aerodynamic Characteristics of a Straight-bladed Vertical Axis Wind Turbine Based on Experiments and Simulations

et al. 2018

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Abstract:The blade pitch angle has a significant influence on the aerodynamic characteristics of horizontal axis wind turbines. However, few research results have revealed its impact on the straight-bladed vertical axis wind turbine (Sb-VAWT). In this paper, wind tunnel experiments and CFD simulations were performed at the Sb-VAWT to investigate the effect of different blade pitch angles on the pressure distribution on the blade surface, the torque coefficient, and the power coefficient. In this study, the airfoil type was NACA0021 with two blades. The Sb-VAWT had a rotor radius of 1.0 m with a spanwise length of 1.2 m. The simulations were based on the k-ω Shear Stress Transport (SST) turbulence model and the wind tunnel experiments were carried out using a high-speed multiport pressure device. As a result, it was found that the maximum pressure difference on the blade surface was obtained at the blade pitch angle of β = 6 • in the upstream region. However, the maximum pressure coefficient was shown at the blade pitch angle of β = 8 • in the downstream region. The torque coefficient acting on a single blade reached its maximum value at the blade pitch angle of β = 6 • . As the tip speed ratio increased, the power coefficient became higher and reached the optimum level. Subsequently, further increase of the tip speed ratio only led to a quick reversion of the power coefficient. In addition, the results from CFD simulations had also a good agreement with the results from the wind tunnel experiments. As a result, the blade pitch angle did not have a significant influence on the aerodynamic characteristics of the Sb-VAWT.

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Section: Methodsmentioning

confidence: 99%

Effect of Blade Pitch Angle on the Aerodynamic Characteristics of a Straight-bladed Vertical Axis Wind Turbine Based on Experiments and Simulations

et al. 2018

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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%

“…In 1986 Vittencoq [18] indicated the evolution of the dynamic stall of blade surface in detail at Reynolds number of 3.8 × 10 4 and different TSRs with 2D CFD simulations. In this study, in the case of stall, the vortex was formed on the trailing edge of blade, advanced along the upper surface of blade toward the leading edge, and began to fall off as it moved with 1/3 of the tangential velocity of blade.…”

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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“…D is the rotor diameter of wind turbine, and H is the height of blade. As a result, the power coefficient represents the aerodynamic efficiency of the wind turbine and a function of the tip speed ratio l as [3,15,18,23,38,50,51].…”

Section: Variation Of Forcesmentioning

confidence: 99%

The influence of flow field and aerodynamic forces on a straight-bladed vertical axis wind turbine

Maeda

Kamada

et al. 2016

Energy

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Fundamental study on aerodynamic force of floating offshore wind turbine with cyclic pitch mechanism

Cited by 51 publications

References 23 publications

Effect of Blade Pitch Angle on the Aerodynamic Characteristics of a Straight-bladed Vertical Axis Wind Turbine Based on Experiments and Simulations

Effect of Blade Pitch Angle on the Aerodynamic Characteristics of a Straight-bladed Vertical Axis Wind Turbine Based on Experiments and Simulations

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

The influence of flow field and aerodynamic forces on a straight-bladed vertical axis wind turbine

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