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CFD study of a combined lift and drag-based novel Savonius vertical axis water turbine

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Abstract

The objective of the present study is harnessing hydropower by combining lift and drag-based blades in a proposed Savonius vertical axis water turbine design and analyzing its hydrodynamic performance. It is a two-bladed design with each blade having two different blade sections—an airfoil blade section for harnessing lift force and a straight blade section for harnessing drag force. The detailed hydrodynamic performance of the proposed turbine has been investigated through flow physics study for various water speeds and azimuthal angles. For more exploration of the turbine performance, the effect of the overlap ratio in the straight blade section has been studied. The performance of the proposed combined lift and drag (CLD) turbine is optimal at overlap ratio 19.21%, water velocity 0.7 m/s, in which a maximum \({C}_{p}\) of 0.139 is obtained at a tip speed ratio 0.6 with a maximum hydrodynamic torque of 0.832 N m, obtained at 135° azimuthal position.

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Acknowledgements

All the co-authors are thankful for immense support and suggestions throughout.

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Authors and Affiliations

  1. National Institute of Technology Silchar, Silchar, Assam, 788010, India

    Agnimitra Biswas & Rahul Dev Misra

  2. Bineswar Brahma Engineering College, Kokrajhar, Assam, 783370, India

    Mithinga Basumatary

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Correspondence to Agnimitra Biswas.

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Basumatary, M., Biswas, A. & Misra, R.D. CFD study of a combined lift and drag-based novel Savonius vertical axis water turbine. J Mar Sci Technol 28, 27–43 (2023). https://doi.org/10.1007/s00773-022-00907-4

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