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Influence of the deflector plate on the performance of modified Savonius water turbine

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  • Golecha, Kailash
  • Eldho, T.I.
  • Prabhu, S.V.
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    Abstract

    Savonius rotor is simple in design and easy to fabricate at a lower cost. The basic driving force of Savonius rotor is drag. The drag coefficient of a concave surface is more than the convex surface. Hence, the advancing blade with concave side facing the water flow would experience more drag force than the returning blade, thus forcing the rotor to rotate. Net driving force can be increased by reducing the reverse force on the returning blade. This can be realized by providing flow obstacle to the returning blade. The objective of the present work is to find out the optimal position of the deflector plate upstream to the flow which would result in maximum power generated by the rotor. Experimental investigations are carried out to study the influence of the location of the deflector plate on the performance of a modified Savonius rotor with water as the working medium at a Reynolds number of 1.32×105. Eight different positions of the deflector plate are attempted in this study. Results conclude that deflector plate placed at its optimal position increases the coefficient of power by 50%. Maximum coefficient of power is found to be 0.21 at a tip speed ratio of 0.82 in the presence of deflector plate. Two stage and three stage modified Savonius rotors are tested to study the influence of deflector plate at the optimal position. Maximum coefficient of power improves by 42%, 31% and 17% with deflector plate for two stage 0° phase shift, 90° phase shift and three stage modified Savonius rotor respectively.

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    Bibliographic Info

    Article provided by Elsevier in its journal Applied Energy.

    Volume (Year): 88 (2011)
    Issue (Month): 9 ()
    Pages: 3207-3217

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    Handle: RePEc:eee:appene:v:88:y:2011:i:9:p:3207-3217

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    Related research

    Keywords: Modified Savonius rotor; Coefficient of power; Coefficient of torque; Deflector plate;

    References

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    1. Khan, M.J. & Iqbal, M.T. & Quaicoe, J.E., 2008. "River current energy conversion systems: Progress, prospects and challenges," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(8), pages 2177-2193, October.
    2. Khan, M.J. & Bhuyan, G. & Iqbal, M.T. & Quaicoe, J.E., 2009. "Hydrokinetic energy conversion systems and assessment of horizontal and vertical axis turbines for river and tidal applications: A technology status review," Applied Energy, Elsevier, vol. 86(10), pages 1823-1835, October.
    3. Rourke, Fergal O. & Boyle, Fergal & Reynolds, Anthony, 2009. "Renewable energy resources and technologies applicable to Ireland," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(8), pages 1975-1984, October.
    4. Güney, M.S. & Kaygusuz, K., 2010. "Hydrokinetic energy conversion systems: A technology status review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(9), pages 2996-3004, December.
    5. Shaughnessy, B.M. & Probert, S.D., 1992. "Partially-blocked savonius rotor," Applied Energy, Elsevier, vol. 43(4), pages 239-249.
    6. Rourke, Fergal O. & Boyle, Fergal & Reynolds, Anthony, 2010. "Marine current energy devices: Current status and possible future applications in Ireland," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(3), pages 1026-1036, April.
    7. Kamoji, M.A. & Kedare, S.B. & Prabhu, S.V., 2009. "Experimental investigations on single stage modified Savonius rotor," Applied Energy, Elsevier, vol. 86(7-8), pages 1064-1073, July.
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