Hydrodynamic Performance Evaluation of a Double Stage Savonius Turbine on River Ogun, South-Western Nigeria

Moses Adeniyi Babatunde, Laniyi Laniran Ladokun, M A Oke

Abstract

This study evaluates the hydrodynamic performance of a double-stage Savonius hydrokinetic turbine with a rotor diameter of 0.3m, a rotor height of 0.6m, and a swept area of 0.18 m², designed for deployment in the River Ogun, Southwestern Nigeria. The objective is to assess the turbine's suitability for harnessing energy from low-head rivers. The methodology involved testing the turbine in a riverine environment at selected flow velocities and depths, evaluating its power coefficient (Cp), Tip Speed Ratio (TSR), and power output. The results show that the turbine achieves a maximum Cp of 0.321 at a TSR of 0.5 and a peak power output of 100.9 W at a flow velocity of 1.55 m/s and angular velocity of 5.26 rad/s, and with a cut-in speed of approximately 1.48 m/s. Across all test conditions, the average Cp was approximately 0.3013, indicating an energy conversion efficiency of about 30.1% relative to the total available kinetic power, which is 335.15 W. This result highlights the double-stage Savonius turbine’s capacity to extract energy under ultra-low head and low-velocity conditions efficiently and highlights the importance of optimizing turbine design and operating conditions for improved energy generation efficiency.

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References

Khani, M. S., Shahsavani, Y., Mehraein, M. & Kisi, O. (2023) Performance evaluation of the savonius hydrokinetic turbine using soft computing techniques, Renewable Energy, Volume 215, https://doi.org/10.1016/j.renene.2023.118906. 2. Salleh, M. B., Kamaruddin, N. M. & Mohamed-Kassim, Z. (2019) Savonius hydrokinetic turbines for a sustainable river-based energy extraction: A review of the technology and potential applications in Malaysia, Sustainable Energy Technologies and Assessments, Volume 36, https://doi.org/10.1016/j.seta.2019.100554. 3. Kumar, A. & Saini, R.P.. (2016). Performance parameters of Savonius type hydrokinetic turbine – A Review. Renewable and Sustainable Energy Reviews. 64. 289-310. https://doi.org/10.1016/j.rser.2016.06.005. 4. Zemamou, M., Aggour, M., & Toumi, A. (2017). Review of Savonius wind turbine design and performance. Energy Procedia, 141, 383–388. https://doi.org/10.1016/j.egypro.2017.11.047 5. Shanegowda T.G., Shashikumar, C.M., Gumtapure, V. & Madav, V. (2024) Comprehensive analysis of blade geometry effects on Savonius hydrokinetic turbine efficiency: Pathways to clean energy, Energy Conversion and Management: X, Volume 24, https://doi.org/10.1016/j.ecmx.2024.100762. 6. Patel, R., & Patel, V. (2022). Performance analysis of Savonius hydrokinetic turbine using ‘C’ shaped Deflector. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 44(3), 6618–6631. https://doi.org/10.1080/15567036.2022.2101718 7. Wu, K.-T., Lo, K.-H., Kao, R.-C., & Hwang, S.-J. (2022). Numerical and Experimental Investigation of the Effect of Design Parameters on Savonius-Type Hydrokinetic Turbine Performance. Energies, 15(5), 1856. https://doi.org/10.3390/en15051856 8. Mihai, G.; Nicusor, D. (2021) Review of Specific Performance Parameters of Vertical Wind Turbine Rotors Based on the SAVONIUS Type. Energies, 14, 1962, https://doi.org/10.3390/en14071962 9. Maldar, N. R., Ng, C. Y. & Oguz, E. (2020) A review of the optimization studies for Savonius turbine considering hydrokinetic applications, Energy Conversion and Management, Volume 226, https://doi.org/10.1016/j.enconman.2020.113495. 10. Khani, M. S., Shahsavani, Y., Mehraein, M., Rad, M. H. S. & Nikbakhsh, A. A. (2024) Evaluation of the performance of the Savonius hydrokinetic turbines in the straight and curved channels using advanced machine learning methods, Energy, Volume 290, https://doi.org/10.1016/j.energy.2023.130189. 11. Xia, H., Zhang, S., Jia, R., Qiu, H. & Xu, S. (2022) Blade shape optimization of Savonius wind turbine using radial based function model and marine predator algorithm, Energy Reports, Volume 8, Pages 12366-12378, https://doi.org/10.1016/j.egyr.2022.09.062. 12. Afify, R., Saber, E. & Awad, H. (2025) Investigation of an innovative Savonius turbine in practice. Sci Rep 15, 6937. https://doi.org/10.1038/s41598-025-88544-w 13. Azadani, L. N. & Saleh, M. (2022) Effect of blade aspect ratio on the performance of a pair of vertical axis wind turbines, Ocean Engineering, Volume 265, 112627, ISSN 0029-8018, https://doi.org/10.1016/j.oceaneng.2022.112627. 14. Ghane, D & Wakchaure, V. (2025) Comprehensive Analysis of Blade Design Parameters and its Influence on Performance of Micro Wind Turbine, Journal of Mines, Metals and Fuels, 73(5): 1287-1292. DOI: 10.18311/jmmf/2025/48679 15. Ayadju, G., Ujevwerume, I. W., & Edema, A. O. (2020). Shaft design analysis of a 0.1 kW horizontal axis wind turbine. Journal of African Sustainable Development, Vol. 20 No. 2. Hummingbird Publications. Retrieved from https://www.hummingpubng.com 16. Ladokun, L. L., Sule, B. F., Ajao, K. R. & Adeogun, A. G. (2018) Resource assessment and feasibility study for the generation of hydrokinetic power in the tailwaters of selected hydropower stations in Nigeria, Water Science, Volume 32, Issue 2, Pages 338-354, ISSN 1110-4929. https://doi.org/10.1016/j.wsj.2018.05.003. 17. 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 18. Nimvari, M. E., Fatahian, H., & Fatahian, E. (2020). Performance improvement of a Savonius vertical axis wind turbine using a porous deflector. Energy Conversion and Management, 220, 113062. https://doi.org/10.1016/j.enconman.2020.113062

DOI: https://doi.org/10.20961/mekanika.v24i2.104492

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