Comprehensive influence of the additional inner blades with different configurations on the performance of a Savonius wind turbine

ABSTRACT

The effects of adding inner blades to the Bach-type Savonius turbine deserve extensive attention due to its promising improvement of the performance over the conventional turbine. In the present work, the performance improvement is based on comparing the power coefficient of two modified configurations, which produced by installing concentric blade inside the original rotor blade of the conventional Savonius rotor. Numerical simulations are performed for three configurations: the traditional rotor; turbine with the additional inner blades tip parallel to the original turbine blades tip; and turbine with the additional inner blades parallel to the original rotor blades root. Numerical CFD analysis is carried out to study the influence of varying the radius and/or the central angles of the additional inner blades applying ANSYS FLUENT. The considered radius of the additional blades ranges from 0.25 to 0.85 of that of the reference blade whereas the blade central angle varied from 70° to 180°. The acquired numerical results reveal that the performance of the turbine with additional inner blades is increased by 22.39%, 46.27%, and 103.86% when the tip speed ratio equals 0.75, 0.25, and 1.3, respectively.

KEYWORDS:

• Performance
• wind turbine
• Savonius rotor
• Bach-type
• inner blades
• CFD

Nomenclature

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Additional information

Notes on contributors

Hassan Z. Haddad

Hassan Z. Haddad: Lecturer Assistant in Faculty of Engineering- Mataria, Helwan University.

Khairy Elsayed

Khairy Elsayed: Associate Prof. in Mechanical Power Engineering Dept., Faculty of Engineering- Mattria, Helwan University.

Yasser M. Shabana

Yasser M. Shabana: Professor and Head of Mechanical Design  Dept., Faculty of Engineering- Mattria, Helwan University.

Mohamed H. Mohamed

Mohamed H. Mohamed: Professor of Energy Systems  in Mechanical Power Engineering Dept., Faculty of Engineering- Mattria, Helwan University.