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Efficiency improvement of Savonius wind turbine by mean of novel deflector system

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Abstract

In the present study, the effect of installation of two-cylinder deflectors on the performance of Savonius wind turbine was investigated numerically using the computational fluid dynamics method. Hence, a stationary cylinder was mounted in front of the advancing blade to avoid the negative torque affecting the convex surface of the returning blade. Then, a second rotating cylinder was added to deviate the wind toward the advancing blade and to increase the efficiency of the rotor. The effect of cylinder diameter, angular velocity and deflector distance on torque and power coefficients, as well as the flow structure around the rotor, were studied. A two-dimensional incompressible unsteady Reynolds-averaged Navier–Stokes simulation in conjunction with the SST k−ω turbulence model was validated against available experimental data and then used for the studied configurations. A single stationary cylinder results in a maximal improvement of 10% of power coefficient. An improvement up to 97% was obtained by adding the rotating cylinder deflector at high angular velocity (ω = 30 rad/s). A low angular velocity of the rotating deflector (ω = 5 rad/s) requires less energy consumption and enhanced the performance of the Savonius by 18% at tip speed ratio TSR = 1.

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Acknowledgements

This work was supported by the Ministry of Higher Education of Tunisia for Fundamental Research Grant Scheme with Project Code: PRF-2019

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Authors and Affiliations

  1. Research Unit “Mechanical Modeling, Materials and Energy”, National School of Engineer of Gabes, The University of Gabes, Gabes, Tunisia

    Mohamed S. Idrissi, Naceur Selmi & Mouldi Chrigui

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  1. Mohamed S. Idrissi
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  2. Naceur Selmi
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  3. Mouldi Chrigui
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Correspondence to Mohamed S. Idrissi.

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Idrissi, M.S., Selmi, N. & Chrigui, M. Efficiency improvement of Savonius wind turbine by mean of novel deflector system. J Braz. Soc. Mech. Sci. Eng. 45, 396 (2023). https://doi.org/10.1007/s40430-023-04330-7

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  • DOI: https://doi.org/10.1007/s40430-023-04330-7

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