Effect of rotor aspect ratio and solidity on a straight-bladed vertical axis wind turbine in three-dimensional analysis by the panel method

Li, Qingan; Maeda, Takao; Kamada, Y.; Shimizu, Kento; Ogasawara, Tatsuhiko; Nakai, Alisa; Kasuya, Takuji

doi:10.1016/j.energy.2016.12.112

Cited by 90 publications

(19 citation statements)

References 35 publications

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“…When the blade solidities were 0.251, 0.333, 0.417, and 0.500, the maximum values of the power coefficient of the wind turbine were around 0.48, 0.47, 0.40, and 0.27, respectively. Li et al also verified this conclusion via wind tunnel experiments [24] and the panel method [25], from which the maximum value of power coefficient decreased with the increase of the blade solidity.…”

Section: Introductionmentioning

confidence: 55%

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: Introductionmentioning

confidence: 55%

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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“…This disparity highlights that there is still no consensus on the optimal solidity for a VAWT. Jain and Abhishek [22] found an increase in the power coefficient with the increase of solidity, whereas Li et al [23], [24] found exactly the opposite behavior. Subramanian et al [25] verified that high solidity turbines performed better at low tip-speed ratios.…”

mentioning

confidence: 94%

Parametrical evaluation of the aerodynamic performance of vertical axis wind turbines for the proposal of optimized designs

Meana-Fernández

Solís-Gallego

Oro

et al. 2018

Energy

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Many studies have tried to give insight into the optimal values of solidity and the airfoil geometry that maximize the performance and self-starting capability of vertical axis wind turbines, but there is still no consensus. In addition, most studies focus on one particular airfoil or airfoil family, which makes the generalization of the results difficult. In this work, these research gaps are intended to be assessed. An exhaustive analysis of the influence of solidity, blade Reynolds number and airfoil geometry on the performance of a straight-bladed vertical axis wind turbine has been performed using a methodology based on streamtube models. An airfoil database of 34 airfoils has been generated, developing a practical and cost-effective tool for the quick comparison of turbine designs (70 different configurations were analyzed). This tool, validated with results from the literature and computational fluid dynamics simulations performed by the authors, has allowed to propose an optimal solidity range from 0.25 to 0.5 and the use of almost symmetrical airfoils (camber < 3%). Finally, this tool has been applied to design two vertical axis wind turbines optimized for low and medium wind speeds.

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“…In 2017 Thé and Yu [26] also got the similar results by a free vortex model. Moreover, Li et al [27] studied the effect of solidity and rotor aspect ratio on the circulation amount and power coefficient using the panel method in the condition of three-dimensional model. In their study, the rotor aspect ratio was only affected by the airflow near the blade tip.…”

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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Effect of rotor aspect ratio and solidity on a straight-bladed vertical axis wind turbine in three-dimensional analysis by the panel method

Cited by 90 publications

References 35 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

Parametrical evaluation of the aerodynamic performance of vertical axis wind turbines for the proposal of optimized designs

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

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