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

Energies

Madjid Soltani¹  Behnam Rafiei¹  Seyyed Abolfazl Nasrazadani²  Kobra Gharali²  Mohammad Hassan Ranjbar²  Armughan Al-Haq³  Jatin Nathwani³ 

[1] Department of Mechanical Engineering, K.N. Toosi University of Technology, Tehran 19395-19919, Iran;School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran;Waterloo Institute for Sustainable Energy (WISE), University of Waterloo, Waterloo, ON N2L 3G1, Canada;

关键词: DAWT;    ducted wind turbine;    H type Darrieus;    VAWT;    dynamic stall;    leading edge vortex;   

DOI  :  10.3390/en14185780

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown