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Energies 2018, 11(6), 1482; https://doi.org/10.3390/en11061482

Upstream Flow Control for the Savonius Rotor under Various Operation Conditions

1
School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
2
Faculty of Engineering, Takoradi Technical University, Takoradi P.O. Box 256, Ghana
*
Author to whom correspondence should be addressed.
Received: 30 April 2018 / Accepted: 1 June 2018 / Published: 6 June 2018

Abstract

Applications of the Savonius rotor have been extended in recent years, necessitating an in-depth investigation on flow characteristics of such a fluid energy converting device. For the wake flow downstream of the Savonius rotor, studies have been reported extensively. Nevertheless, literature specifically devoted to the upstream flow of the Savonius rotor can rarely be found. This review collects and compiles findings from relevant studies to prove the significance of upstream flow patterns to the operation of the Savonius rotor. Then attempts from experimental and numerical aspects to substantiate the important effect of the upstream flow are implemented. Based on practical cases and laboratory works, upstream flow patterns for the Savonius rotor are divided into four types, namely uniform flow, guided flow, rotor wake flow and oscillating flow. Accordingly, conditions under which these upstream flow patterns arise are analyzed respectively. Experimental and numerical results are presented to clarify the influential factors underlying diverse upstream flow patterns. Furthermore, the relationship between the performance of the Savonius and the upstream flow is elucidated, facilitating the development of techniques of controlling the upstream flow. This review provides a systematic reference for the control of the upstream flow for the Savonius rotor, which has the tendency of developing into an independent technical branch. View Full-Text
Keywords: Savonius rotor; upstream flow; auxiliary device; multiple rotors; experimental condition; rotor performance Savonius rotor; upstream flow; auxiliary device; multiple rotors; experimental condition; rotor performance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kang, C.; Opare, W.; Pan, C.; Zou, Z. Upstream Flow Control for the Savonius Rotor under Various Operation Conditions. Energies 2018, 11, 1482.

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