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Rotation improvement of vertical axis wind turbine by offsetting pitching angles and changing blade numbers

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  • Sun, Xuejing
  • Zhu, Jianyang
  • Li, Zongjin
  • Sun, Guoxing

Abstract

To improve the power extraction performance and self-starting characteristics of the vertical axis wind turbine (VAWT), the effect of offsetting pitching angles and blade numbers on the performance of a wind-induced rotation VAWT has been systematically investigated. Different from the conventional numerical and experimental approach, the rotation velocity of the turbine is driven by the aerodynamic torque of the blade in the present study. The flow around the turbine was simulated using Fluent 6.3 code, and the governing equation of the turbine’s rotation was coupled to the code through UDF. The optimized pitching angle β was found to be of −4°, at which the maximum 5.89 and 5.14 times average power increasing were achieved for the turbine with 5-blades and 3-blades, respectively. Moreover, shorter self-starting time was also observed for the turbine with β = −4° at larger wind velocity (>9 m/s). In addition, the influence of the blade number on the performance of the turbine depended on the wind velocity. The analysis of the flow field of the turbine showed that the offsetting pitching angle and blade number could suppress or delay the vortex separation, and therefore improve the overall performance of the turbine.

Suggested Citation

  • Sun, Xuejing & Zhu, Jianyang & Li, Zongjin & Sun, Guoxing, 2021. "Rotation improvement of vertical axis wind turbine by offsetting pitching angles and changing blade numbers," Energy, Elsevier, vol. 215(PB).
    • Handle: RePEc:eee:energy:v:215:y:2021:i:pb:s0360544220322842
    DOI: 10.1016/j.energy.2020.119177
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    References listed on IDEAS

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    Cited by:

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    5. Qiang Gao & Shuai Lian & Hongwei Yan, 2022. "Aerodynamic Performance Analysis of Adaptive Drag-Lift Hybrid Type Vertical Axis Wind Turbine," Energies, MDPI, vol. 15(15), pages 1-15, August.
    6. Muhammad Saif Ullah Khalid & David Wood & Arman Hemmati, 2022. "Self-Starting Characteristics and Flow-Induced Rotation of Single- and Dual-Stage Vertical-Axis Wind Turbines," Energies, MDPI, vol. 15(24), pages 1-19, December.
    7. Ardaneh, Fatemeh & Abdolahifar, Abolfazl & Karimian, S.M.H., 2022. "Numerical analysis of the pitch angle effect on the performance improvement and flow characteristics of the 3-PB Darrieus vertical axis wind turbine," Energy, Elsevier, vol. 239(PD).
    8. Sikandar Khan, 2023. "A Modeling Study Focused on Improving the Aerodynamic Performance of a Small Horizontal Axis Wind Turbine," Sustainability, MDPI, vol. 15(6), pages 1-15, March.
    9. Taimoor Asim & Dharminder Singh & M. Salman Siddiqui & Don McGlinchey, 2022. "Effect of Stator Blades on the Startup Dynamics of a Vertical Axis Wind Turbine," Energies, MDPI, vol. 15(21), pages 1-19, October.

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