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Experimental study on a modified Savonius wind rotor for street lighting systems. Analysis of external appendages and elements

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  • Montelpare, Sergio
  • D'Alessandro, Valerio
  • Zoppi, Andrea
  • Ricci, Renato

Abstract

This paper is aimed at investigating the performance of a Savonius generator in the presence of external aerodynamic appendages. The Savonius generator is a slender (high aspect ratio) vertical axis wind turbine and is part of a public lighting system (a street lamp) powered by renewable energy sources, particularly wind and solar energy. The external elements are self aligning systems, a conveyor and a deflector, used to increase the rotor's aerodynamic performance. The high aspect ratio, required for architectural integration, and the use of self aligning aerodynamic appendages distance this Savonius assembly from all the other ones tested in previous research works. For this reason, new tests have been carried out in static and dynamic conditions on a 1:1 scale model in the Environmental Wind Tunnel (EWT) of Marche Polytechnic University (UNIVPM); three different rotors at different wind velocities were analyzed for each possible combination of aerodynamic appendages. The results showed that the rotor's performance could be increased with the simultaneous application of a conveyor and deflector, reaching a maximum power coefficient of about 0.3. Also static measurements were performed on a locked rotor at different angles of attack. The torque angular distribution showed a periodic behavior with no negative torque values.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:144:y:2018:i:c:p:146-158
    DOI: 10.1016/j.energy.2017.12.017
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    References listed on IDEAS

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    Cited by:

    1. Can Kang & Wisdom Opare & Chen Pan & Ziwen Zou, 2018. "Upstream Flow Control for the Savonius Rotor under Various Operation Conditions," Energies, MDPI, vol. 11(6), pages 1-20, June.
    2. D'Alessandro, Valerio & Clementi, Giacomo & Giammichele, Luca & Ricci, Renato, 2019. "Assessment of the dimples as passive boundary layer control technique for laminar airfoils operating at wind turbine blades root region typical Reynolds numbers," Energy, Elsevier, vol. 170(C), pages 102-111.
    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. Alom, Nur & Saha, Ujjwal K., 2018. "Performance evaluation of vent-augmented elliptical-bladed savonius rotors by numerical simulation and wind tunnel experiments," Energy, Elsevier, vol. 152(C), pages 277-290.
    5. Mohammadi, M. & Mohammadi, R. & Ramadan, A. & Mohamed, M.H., 2018. "Numerical investigation of performance refinement of a drag wind rotor using flow augmentation and momentum exchange optimization," Energy, Elsevier, vol. 158(C), pages 592-606.

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