Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct

Mohammad Hassan Ranjbar, Behnam Rafiei, Seyyed Abolfazl Nasrazadani, Kobra Gharali, Madjid Soltani, Armughan Al-Haq and Jatin Nathwani
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Mohammad Hassan Ranjbar: School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran
Behnam Rafiei: Department of Mechanical Engineering, K.N. Toosi University of Technology, Tehran 19395-19919, Iran
Seyyed Abolfazl Nasrazadani: School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran
Kobra Gharali: School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran
Madjid Soltani: Department of Mechanical Engineering, K.N. Toosi University of Technology, Tehran 19395-19919, Iran
Armughan Al-Haq: Waterloo Institute for Sustainable Energy (WISE), University of Waterloo, Waterloo, ON N2L 3G1, Canada
Jatin Nathwani: Waterloo Institute for Sustainable Energy (WISE), University of Waterloo, Waterloo, ON N2L 3G1, Canada

Energies, 2021, vol. 14, issue 18, 1-16

Abstract: Efforts to increase the power output of wind turbines include Diffuser Augmented Wind Turbines (DAWT) or a shroud for the rotor of a wind turbine. The selected duct has three main components: a nozzle, a diffuser, and a flange. The combined effect of these components results in enriched upstream velocity for the rotor installed in the throat of the duct. To obtain the maximum velocity in the throat of the duct, the optimum angles of the three parts have been analyzed. A code was developed to allow all the numerical steps including changing the geometries, generating the meshes, and setting up the numerical solver simultaneously. Finally, the optimum geometry of the duct has been established that allows a doubling of the flow velocity. The flow characteristics inside the duct have also been analyzed in detail. An H-Darrieus Vertical Axis Wind Turbine (VAWT) has been simulated inside the optimized duct. The results show that the power coefficient of the DAWT can be enhanced up to 2.9 times. Deep dynamic stall phenomena are captured perfectly. The duct advances the leading-edge vortex generation and delays the vortex separation.

Keywords: DAWT; ducted wind turbine; H type Darrieus; VAWT; dynamic stall; leading edge vortex (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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