Aerodynamic Performance Improvement of Hybrid Darrieus-Savonius Vertical Axis Wind Turbine

Document Type : Research Article

Authors

Department of Aerospace Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.

Abstract

Returning blades of Savonius vertical axis wind turbines make negative effects on the total moment produced by the turbines especially at high tip speed ratios. For hybrid Darrieus[1]Savonius vertical-axis wind turbines at the dynamic mode, with tip speed ratio increment from self[1]starting to that of high values, returning blades of its Savonius part make the whole part to produce negative moment. In the present work, in order to reduce negative effects of returning blades of Savonius vertical-axis wind turbines and consequently improve its aerodynamic performance, a wall is placed in front of them. Several configurations including two types of blade shapes with three types of wall placements are simulated three-dimensionally and their output-moment and moment fluctuations are computed for one complete cycle. Desired Savonius vertical-axis wind turbine with suitable wall which produces the most average-moment and the least moment fluctuations are mounted on a straight-blade Darrieus vertical-axis wind turbine and they formed a hybrid vertical-axis wind turbine. In comparison to straight-blade vertical-axis wind turbine, at the tip speed ratio of 0.9 proposed hybrid vertical-axis wind turbines produces 2.3% more average-moment along with 40% fewer moment fluctuations. This means in term of tip speed ratio values, proposed hybrid vertical-axis wind turbine has wider operating range in comparison to its general types.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 52, Issue 7
October 2020
Pages 1865-1884

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