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

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  • Yanzhao Yang

    (College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
    Graduate School of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan)

  • Zhiping Guo

    (College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China)

  • Yanfeng Zhang

    (College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
    Graduate School of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan)

  • Ho Jinyama

    (Graduate School of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan)

  • Qingan Li

    (Division of Mechanical Engineering, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan)

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.

Suggested Citation

  • Yanzhao Yang & Zhiping Guo & Yanfeng Zhang & Ho Jinyama & Qingan Li, 2017. "Numerical Investigation of the Tip Vortex of a Straight-Bladed Vertical Axis Wind Turbine with Double-Blades," Energies, MDPI, vol. 10(11), pages 1-18, October.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1721-:d:116713
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    References listed on IDEAS

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    6. Alom, Nur & Saha, Ujjwal K., 2018. "Performance evaluation of vent-augmented elliptical-bladed savonius rotors by numerical simulation and wind tunnel experiments," Energy, Elsevier, vol. 152(C), pages 277-290.
    7. Xiaohang Wang & Wentong Chong & Kokhoe Wong & Liphuat Saw & Sinchew Poh & Saihin Lai & Chin-Tsan Wang, 2018. "Preliminary Performance Tests and Simulation of a V-Shape Roof Guide Vane Mounted on an Eco-Roof System," Energies, MDPI, vol. 11(10), pages 1-33, October.
    8. Ying Wang & Wensheng Lu & Kaoshan Dai & Miaomiao Yuan & Shen-En Chen, 2018. "Dynamic Study of a Rooftop Vertical Axis Wind Turbine Tower Based on an Automated Vibration Data Processing Algorithm," Energies, MDPI, vol. 11(11), pages 1-21, November.
    9. Peng, H.Y. & Liu, H.J. & Yang, J.H., 2021. "A review on the wake aerodynamics of H-rotor vertical axis wind turbines," Energy, Elsevier, vol. 232(C).
    10. Yanzhao Yang & Zhiping Guo & Qing Song & Yanfeng Zhang & Qing’an Li, 2018. "Effect of Blade Pitch Angle on the Aerodynamic Characteristics of a Straight-bladed Vertical Axis Wind Turbine Based on Experiments and Simulations," Energies, MDPI, vol. 11(6), pages 1-15, June.
    11. Shern-Khai Ung & Wen-Tong Chong & Shabudin Mat & Jo-Han Ng & Yin-Hui Kok & Kok-Hoe Wong, 2022. "Investigation into the Aerodynamic Performance of a Vertical Axis Wind Turbine with Endplate Design," Energies, MDPI, vol. 15(19), pages 1-26, September.
    12. Jia Guo & Liping Lei, 2020. "Flow Characteristics of a Straight-Bladed Vertical Axis Wind Turbine with Inclined Pitch Axes," Energies, MDPI, vol. 13(23), pages 1-23, November.

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