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Velocity interference in the rear rotor of a counter-rotating wind turbine

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  • Lee, Seungmin
  • Son, Eunkuk
  • Lee, Soogab

Abstract

A counter-rotating wind turbine having two rotors rotating in opposite directions on the same axis is proposed to improve the aerodynamic performance of a wind turbine. In order to predict the aerodynamic performance of the counter-rotating wind turbine, the inflow interference in its rear rotor by the wake of the front rotor needs to be considered because the rear rotor operates inside the wake of the front rotor. In the previous research, the rear rotor was assumed to operate inside the fully developed stream tube of the front rotor to define the inflow condition on the rear rotor. In this study, to consider simultaneously the aerodynamic interaction between the two rotors of the counter-rotating wind turbine without any assumption on the inflow velocity of the rear rotor, an aerodynamic analysis of the counter-rotating wind turbine was carried out by using a free-wake vortex lattice method. The power coefficient and the wake geometry of the counter-rotating wind turbine were compared with those of a single rotor wind turbine, and the induction factors on the rear rotor were compared with that from the BEMT, assuming that the rear rotor operated inside the fully developed stream tube of the front rotor.

Suggested Citation

  • Lee, Seungmin & Son, Eunkuk & Lee, Soogab, 2013. "Velocity interference in the rear rotor of a counter-rotating wind turbine," Renewable Energy, Elsevier, vol. 54(C), pages 235-240.
    • Handle: RePEc:eee:renene:v:54:y:2013:i:c:p:235-240
    DOI: 10.1016/j.renene.2012.08.003
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    References listed on IDEAS

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    1. Jung, Sung Nam & No, Tae-Soo & Ryu, Ki-Wahn, 2005. "Aerodynamic performance prediction of a 30kW counter-rotating wind turbine system," Renewable Energy, Elsevier, vol. 30(5), pages 631-644.
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    Cited by:

    1. Cai, Wei & Hu, Yang & Wang, Haonan & Yao, Lujin & Guo, Xiaojiang & Liu, Jizhen, 2024. "Cross-coupling control design of a flexible dual rotor wind turbine with enhanced wind energy capture capacity," Renewable Energy, Elsevier, vol. 220(C).
    2. Michał Pacholczyk & Dariusz Karkosiński, 2020. "Parametric Study on a Performance of a Small Counter-Rotating Wind Turbine," Energies, MDPI, vol. 13(15), pages 1-17, July.
    3. Didane, Djamal Hissein & Rosly, Nurhayati & Zulkafli, Mohd Fadhli & Shamsudin, Syariful Syafiq, 2018. "Performance evaluation of a novel vertical axis wind turbine with coaxial contra-rotating concept," Renewable Energy, Elsevier, vol. 115(C), pages 353-361.
    4. Han, Wanlong & Yan, Peigang & Han, Wanjin & He, Yurong, 2015. "Design of wind turbines with shroud and lobed ejectors for efficient utilization of low-grade wind energy," Energy, Elsevier, vol. 89(C), pages 687-701.
    5. Kumar, Vedant & Saha, Sandeep, 2019. "Theoretical performance estimation of shrouded-twin-rotor wind turbines using the actuator disk theory," Renewable Energy, Elsevier, vol. 134(C), pages 961-969.

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