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Partially-blocked savonius rotor

Author

Listed:
  • Shaughnessy, B.M.
  • Probert, S.D.

Abstract

A Savonius rotor can develop a relatively high torque at a low rotational speed. It is cheap to build, but harnesses only a small fraction of the wind energy incident upon it. One proposal for augmenting the energy-harnessing effectiveness was to employ a V-shaped deflector mounted upstream of the rotor, apex into the wind, so that the air-flow resistance encountered by the half of the wind-turbine blade advancing (i.e. moving) into the wind was reduced. By (i) carrying out experimental tests with the deflector in different positions relative to the rotor, and (ii) varying the wedge angle between the deflector blades, an optimal configuration for the particular system tested was determined. With the optimally pitched deflector set at its optimal location, the rotor harnessed about 20% more power, compared with the unblocked (i.e. standard) rotor both for an approximate wind speed of 4 ms-1. Such a significant improvement, achieved by this simple cheap means, suggests that the use of the partially blocking wedge is highly desirable.

Suggested Citation

  • Shaughnessy, B.M. & Probert, S.D., 1992. "Partially-blocked savonius rotor," Applied Energy, Elsevier, vol. 43(4), pages 239-249.
    • Handle: RePEc:eee:appene:v:43:y:1992:i:4:p:239-249
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    Citations

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    Cited by:

    1. Jin, Xin & Wang, Yaming & Ju, Wenbin & He, Jiao & Xie, Shuangyi, 2018. "Investigation into parameter influence of upstream deflector on vertical axis wind turbines output power via three-dimensional CFD simulation," Renewable Energy, Elsevier, vol. 115(C), pages 41-53.
    2. Wong, Kok Hoe & Chong, Wen Tong & Sukiman, Nazatul Liana & Poh, Sin Chew & Shiah, Yui-Chuin & Wang, Chin-Tsan, 2017. "Performance enhancements on vertical axis wind turbines using flow augmentation systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 904-921.
    3. Guo, Fen & Song, Baowei & Mao, Zhaoyong & Tian, Wenlong, 2020. "Experimental and numerical validation of the influence on Savonius turbine caused by rear deflector," Energy, Elsevier, vol. 196(C).
    4. C M, Shashikumar & Madav, Vasudeva, 2021. "Numerical and experimental investigation of modified V-shaped turbine blades for hydrokinetic energy generation," Renewable Energy, Elsevier, vol. 177(C), pages 1170-1197.
    5. Yang, Min-Hsiung & Huang, Guan-Ming & Yeh, Rong-Hua, 2016. "Performance investigation of an innovative vertical axis turbine consisting of deflectable blades," Applied Energy, Elsevier, vol. 179(C), pages 875-887.
    6. Kang, Can & Zhao, Hexiang & Zhang, Yongchao & Ding, Kejin, 2021. "Effects of upstream deflector on flow characteristics and startup performance of a drag-type hydrokinetic rotor," Renewable Energy, Elsevier, vol. 172(C), pages 290-303.
    7. Ricci, Renato & Romagnoli, Roberto & Montelpare, Sergio & Vitali, Daniele, 2016. "Experimental study on a Savonius wind rotor for street lighting systems," Applied Energy, Elsevier, vol. 161(C), pages 143-152.
    8. Ferdoues, Mst Sunzida & Ebrahimi, Sasan & Vijayaraghavan, Krishna, 2017. "Multi-objective optimization of the design and operating point of a new external axis wind turbine," Energy, Elsevier, vol. 125(C), pages 643-653.
    9. Altaf Hussain Rajpar & Imran Ali & Ahmad E. Eladwi & Mohamed Bashir Ali Bashir, 2021. "Recent Development in the Design of Wind Deflectors for Vertical Axis Wind Turbine: A Review," Energies, MDPI, vol. 14(16), pages 1-23, August.
    10. Krzysztof Sobczak & Damian Obidowski & Piotr Reorowicz & Emil Marchewka, 2020. "Numerical Investigations of the Savonius Turbine with Deformable Blades," Energies, MDPI, vol. 13(14), pages 1-20, July.
    11. Montelpare, Sergio & D'Alessandro, Valerio & Zoppi, Andrea & Ricci, Renato, 2018. "Experimental study on a modified Savonius wind rotor for street lighting systems. Analysis of external appendages and elements," Energy, Elsevier, vol. 144(C), pages 146-158.
    12. Golecha, Kailash & Eldho, T.I. & Prabhu, S.V., 2011. "Influence of the deflector plate on the performance of modified Savonius water turbine," Applied Energy, Elsevier, vol. 88(9), pages 3207-3217.
    13. Roy, Sukanta & Saha, Ujjwal K., 2015. "Wind tunnel experiments of a newly developed two-bladed Savonius-style wind turbine," Applied Energy, Elsevier, vol. 137(C), pages 117-125.

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