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Mechanisms of power augmentation in two side-by-side vertical axis wind turbines

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  • Alexander, Aaron S.
  • Santhanakrishnan, Arvind

Abstract

Using two-dimensional computational fluid dynamics (CFD) simulations, this study examines the physical mechanisms of performance improvement in a double rotor vertical axis wind turbine (VAWT) as compared to a single rotor VAWT. It was found that the primary mechanism for the approximately 10% improvement in power coefficient (CP) for the double rotor VAWT was a reduction in the bypass flow that passes around the outside of the single rotor VAWT. The single rotor VAWT is shown to cause greater than 54% of the incoming flow to bypass around the outside of the VAWT. By placing a second rotor in the system, the cross-stream flow that would normally exist to one side is suppressed due to the opposing cross-stream flow from the second rotor. The collision of cross-stream velocities results in a high pressure field upstream of the rotors. This high pressure field re-directs more flow through the rotors, reducing the total bypass down to below 51%. This reduction in total bypass is solely due to the reduction in bypass on the interior of the double rotor system as the exterior side actually experiences an increase in bypass of about 83%.

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  • Alexander, Aaron S. & Santhanakrishnan, Arvind, 2020. "Mechanisms of power augmentation in two side-by-side vertical axis wind turbines," Renewable Energy, Elsevier, vol. 148(C), pages 600-610.
    • Handle: RePEc:eee:renene:v:148:y:2020:i:c:p:600-610
    DOI: 10.1016/j.renene.2019.10.149
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    References listed on IDEAS

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    Cited by:

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    2. Kuang, Limin & Katsuchi, Hiroshi & Zhou, Dai & Chen, Yaoran & Han, Zhaolong & Zhang, Kai & Wang, Jiaqi & Bao, Yan & Cao, Yong & Liu, Yijie, 2023. "Strategy for mitigating wake interference between offshore vertical-axis wind turbines: Evaluation of vertically staggered arrangement," Applied Energy, Elsevier, vol. 351(C).
    3. Barnes, Andrew & Marshall-Cross, Daniel & Hughes, Ben Richard, 2021. "Towards a standard approach for future Vertical Axis Wind Turbine aerodynamics research and development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
    4. Yadav, Sandeep & Veeravalli, Srinivas V. & Singh, Sidh Nath, 2024. "Effect of rotor spacing, overlapping and non-overlapping, on the performance of a coupled counter-rotating twin-rotor VAWT using CFD," Renewable Energy, Elsevier, vol. 221(C).
    5. Villeneuve, Thierry & Dumas, Guy, 2021. "Impact of some design considerations on the wake recovery of vertical-axis turbines," Renewable Energy, Elsevier, vol. 180(C), pages 1419-1438.
    6. Manuel Viqueira-Moreira & Esteban Ferrer, 2020. "Insights into the Aeroacoustic Noise Generation for Vertical Axis Turbines in Close Proximity," Energies, MDPI, vol. 13(16), pages 1-18, August.

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