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Technical Briefs

Numerical Study of a Six-Bladed Savonius Wind Turbine

[+] Author and Article Information
Binyet Emmanuel, Wang Jun

Fluid Machinery Department,  Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People’s Republic of Chinaemmanuelbinyet@hotmail.com

J. Sol. Energy Eng 133(4), 044503 (Oct 18, 2011) (5 pages) doi:10.1115/1.4004549 History: Received November 18, 2010; Revised June 28, 2011; Published October 18, 2011; Online October 18, 2011

The aim of the present paper is to investigate ways of improving the efficiency of a six-bladed Savonius rotor. The efficiency of Savonius machines is low because of the “negative drag” exerted on the convex part of the blades and also because the torque of standard Savonius rotors varies substantially during one rotation and therefore affects the self starting of the rotor at certain wind angles. Improvement of the efficiency of the Savonius rotor is carried out by increasing the number of blades and also by preventing the wind from impinging on the convex parts. The latter can be done by hiding the convex part of the blades behind a shield or a vane. The present paper shows the results of two-dimensional computational fluid dynamics (CFD) computations, indicating a promising increase of the power coefficient from 0.3 to 0.5.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Main geometric factors of the Savonius rotor, physical model, and our prototype

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Figure 2

CFD model, two-dimensional grid, and boundary conditions

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Figure 3

Flow over time for a wind speed of 3 m/s

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Figure 4

CFD flow field (pressure and streamlines) for different inner diameters under a wind speed of 3 m/s and a TSR of 0.5

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Figure 5

Steady flow for a wind speed of 3 m/s and a TSR of 0.2 and 0.5 (above) and for a wind speed of 6 m/s for a TSR of 0.2 and 0.5 (below)

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Figure 6

Flow for a wind speed of 3 m/s, rotor with partial and full shield for a TSR of 1 and 0.5

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Figure 7

Rotor with stator for a wind speed of 2 m/s and 6 m/s for a TSR of 0.8 and 0.2

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Figure 8

λ-Cp curves, comparing the efficiency

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