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Energy Performance and Radial Force of Vertical Axis Darrieus Turbine for Ocean Energy

1
State Key Laboratory of Hydroscience and Engineering, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
2
College of Water Resources and Architectural Engineering, Northwest A & F University, Xianyang 712100, China
*
Authors to whom correspondence should be addressed.
Energies 2020, 13(20), 5412; https://doi.org/10.3390/en13205412
Received: 25 August 2020 / Revised: 30 September 2020 / Accepted: 1 October 2020 / Published: 16 October 2020
(This article belongs to the Section Wind, Wave and Tidal Energy)
Vertical axis Darrieus turbine is the key component for ocean energy conversion and utilization. In the present work, the energy performance, flow pattern, and radial force for a vertical axis Darrieus turbine were investigated. The experimental measurements and numerical simulations were in good agreement, which validates the accuracy and reliability of the numerical method. The results showed that the power coefficient gradually increased with the increase of tip speed ratio λ, and the power coefficient had three peaks in a revolution of runner due to three blades. The complex vortex induced by the turbine revolution mainly includes the blade tip vortex and blade surface vortex, which are related to the turbine rotation and flow separation on blade surface. The vorticity transport equation was first introduced to analyze the mechanism and evolution of vortex in a vertical axis Darrieus turbine, and the results revealed that the relative vortex elongation term is the main driving force for the formation and development of the blade surface vortex. The radial force of the Darrieus turbine gradually increases with the increase in tip speed ratio, and it is symmetrical with three humps due to three blades. View Full-Text
Keywords: Darrieus; vertical axis turbine; energy performance; vortex; radial force Darrieus; vertical axis turbine; energy performance; vortex; radial force
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MDPI and ACS Style

Zhang, R.; Huang, Z.; Tan, L.; Wang, Y.; Wang, E. Energy Performance and Radial Force of Vertical Axis Darrieus Turbine for Ocean Energy. Energies 2020, 13, 5412.

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