Wind tunnel and numerical study of a straight-bladed Vertical Axis Wind Turbine in three-dimensional analysis (Part II: For predicting flow field and performance)

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

doi:10.1016/j.energy.2016.03.129

Cited by 53 publications

(12 citation statements)

References 25 publications

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“…With the tip speed ratio continuing to increase, the power coefficient decreases rapidly. This result also has a good agreement with the studies of Lei et al [37] and Li et al [38] in 2016. This indicates that when the blade pitch angles are β = 4 • , 6 • and 8 • , the optimal tip speed ratio is 2.19.…”

Section: Power Coefficient For the Wind Turbinesupporting

confidence: 82%

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: Power Coefficient For the Wind Turbinesupporting

confidence: 82%

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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“…A summary table of some valuable PIV tests is provided in Table 5. Some similar studies by using Acoustic Doppler Velocimeter (ADV), Laser Doppler Velocimetry ( LDV ) and magnetic resonance velocimetry (MRV) for studying the H-Darrieus turbine flow could be also found in reference 174 , references 164,175,176 and reference 177 respectively. The effects of inflow conditions on vertical axis wind turbine wake structure and performance *The Reynolds number is calculated based on the upstream wind speed and blade chord length Table 5 Summary of typical PIV tests…”

Section: D and 3d Optical Measurementsmentioning

confidence: 97%

“…Published information from many wind tunnel studies using traditional techniques to study the turbine performance is widely available (e.g. references 5,30,37,95,102,148,[161][162][163][164][165] ) and a summary table is provided in Table 4. Effects of various design parameters on turbine self-starting and overall performance *The Reynolds number is calculated based on the upstream wind speed.…”

Section: Traditional Wind Tunnel Measurementmentioning

confidence: 99%

A review of H-Darrieus wind turbine aerodynamic research

Ingram

Dominy

2019

Proceedings of the Institution of Mechanical Engineers, Part C:

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The H-Darrieus vertical axis turbine is one of the most promising wind energy converters for locations where there are rapid variations of wind direction, such as in the built environment. The most challenging considerations when employing one of these usually small machines are to ensure that they self-start and to maintain and improve their efficiency. However, due to the turbine's rotation about a vertical axis, the aerodynamics of the turbine are more complex than a comparable horizontal axis wind turbine and our knowledge and understanding of these turbines falls remains far from complete. This paper provides a detailed review of past and current studies of the H-Darrieus turbine from the perspective of design parameters including turbine solidity, blade profile, pitch angle, etc. and particular focus is put on the crucial challenge to design a turbine that will self-start. Moreover, this paper summarizes the main research approaches for studying the turbine in order to identify successes and promising areas for future study.

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“…In their study, the rotor aspect ratio was only affected by the airflow near the blade tip. In addition, in 2016 Li et al [28,29] discussed the influence of the shedding vortex of blade on the flow field around blade by using LDV system. The results suggested that the wind velocity in the surface of the blade increased and the differential pressure in the surface of the blade decreased as it went away from the center along the spanwise direction.…”

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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Wind tunnel and numerical study of a straight-bladed Vertical Axis Wind Turbine in three-dimensional analysis (Part II: For predicting flow field and performance)

Cited by 53 publications

References 25 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

A review of H-Darrieus wind turbine aerodynamic research

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

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