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Research Papers

Influence of Phase-Shift and Overlap Ratio on Savonius Wind Turbine’s Performance

[+] Author and Article Information
Chen Jian, Jan Kumbernuss

Renewable Energy Research Group (RERG) Department of Building Services Engineering,  The Hong Kong Polytechnic University, Hong Kong, Chinabechenj@polyu.edu.hk

Zhang Linhua

School of Thermal Energy Engineering,  Shandong Jianzhu University, Jinan, China

Lu Lin, Yang Hongxing

Renewable Energy Research Group (RERG) Department of Building Services Engineering,  The Hong Kong Polytechnic University, Hong Kong, China

J. Sol. Energy Eng 134(1), 011016 (Dec 01, 2011) (9 pages) doi:10.1115/1.4004980 History: Received February 17, 2011; Revised August 20, 2011; Published December 01, 2011; Online December 01, 2011

This paper presents the experimental results of the vertical axis wind turbine (VAWT), especially the Savonius rotors, which are developed for application on top of buildings due to lower wind speed compared with remote areas. The VAWT is regarded as the most suitable elegant candidate to be integrated with buildings for its relatively low operating noise, easy maintenance, and easy access. This study explored the interaction effect of the overlap ratio, phase-shift, and stage on the performance of the Savonius rotors in details. The results show that appropriate choice of the phase-shift angle according to the overlap ratio can not only increase the power coefficient of the Savonius rotors but also eliminate the negative static torque and smooth the variation of the static torque coefficient. Moreover, the performance of the two-stage rotors indicates that the two-stage rotor is the best candidate for this type of wind turbines or as a starting assistant for the Darrieus rotors.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

The environmental wind tunnel

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Figure 2

Test rig in the wind tunnel

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Figure 3

Parameters and configuration of the tested Savonius rotor

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Figure 4

Relationship of m versus S/C for square plate and Savonius rotor [14]

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Figure 5

Static torque coefficient of one-stage rotor at wind velocity 8 m/s

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Figure 6

The Ct and Cp of the one-stage Savonius rotor at wind velocity 8 m/s

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Figure 7

Comparisons between one-stage and two-stage rotors for different overlap ratios

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Figure 8

The Cts of the one-stage and two-stage Savonius rotors at wind velocity 8 m/s

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Figure 9

The Cp and Ct of the two-stage Savonius rotor with PSA = 0 degree

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Figure 10

The Cp and Ct of the two-stage Savonius rotor at PSA = 45 degrees

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Figure 11

The Cp and Ct of the two-stage Savonius rotor at PSA = 90 degrees

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Figure 12

The Cts of the two-stage Savonius rotor at wind velocity 8 m/s

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Figure 13

The Cp and Ct of the two-stage Savonius rotor with β = 0

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