Experimental Investigations on the Performance Characteristics of a Modified Four Bladed Savonius Hydro-Kinetic Turbine



Torque variation along the angular positions of the rotor blade and lower efficiency are the main drawbacks of Savonius turbine. To overcome these problems several attempts have been made by the researchers in the recent past.  In this work, an attempt has been made to increase the torque along the angular positions where the torque is low, by placing a set of additional blades called secondary blades in front of the concave side of main rotor blades. These secondary blades are interacting with the flowing fluid when the main blades are not in action. The performance of the modified Savonius turbine is compared with the conventional single blade 0 overlap and 0.2 overlap Savonius turbines, by carrying out the experiments in the open irrigation canal of size 42 cm x 45 cm. Results shows that, the efficiency is improved from 16 % to 19% and the torque values increased along the angular positions of 90°, 120°, 270°, 300°, 330°.  From the observations, it has also been noted that, the modified four bladed Savonius turbine rotates smoothly in comparison with the conventional Savonius. The negative torque a common problem in conventional Savonius is also effectively eliminated in the modified design.

Total Views: 365


Savonius Rotor; Hydro-kinetic Turbine; Coefficient of Torque; Coefficient of Power; Overlap Ratio; Blade Aspect Ratio; Tip Speed Ratio

Full Text:



Khan, M. J., Iqbal, M. T. and Quaicoe, J. E., “River current energy conversion systems: progress, prospects and challenges”, Renewable and Sustainable Energy Reviews, Vol. 12(8), pp. 2177-2193, 2008.

Islam, M. S., Gupta, S. D., Raju, N. I., Masum, M. S., and Karim, S. A., "Potentiality of small-scale hydro power plant using the kinetic energy of flowing water of Gumoti & Surma river of Bangladesh: an energy odyssey" International Journal of Renewable Energy Research, Vol. 3(1), pp. 172-179, 2013.

Savonius, S. J., “The S-turbine and its applications”, Mechanical Engineering, Vol. 53(5), pp. 333–338, 1931.

Alexander, A, J. and Holownia, B. P., Wind tunnel tests on a Savonius rotor, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 3(4), pp. 343-351, 1978.

Saha, U. K., Thotla, S. and Maity, D., “Optimum design configuration of Savonius rotor through wind tunnel experiments”, Journal of Wind Engineering and Industrial Aerodynamics, Vol. 96(8), pp. 1359-1375, 2008.

Zhao, Z., Zheng, Y., Xu, X., Liu, W. and Hu, G., “Research on the improvement of the performance of Savonius rotor based on numerical study” IEEE conference on Sustainable Power Generation and Supply, pp. 1-6, 2009.

Alexander, A. J. and Holownia, B. P., Wind tunnel tests on a Savonius rotor. Journal of Wind Engineering and Industrial Aerodynamics, Vol. 3(4), pp. 343-351, 1978.

Fujisawa, N., On the torque mechanism of Savonius rotors. Journal of Wind Engineering and Industrial Aerodynamics, Vol. 40(3), pp. 277-292, 1992

Blackwell, B. F., Sheldahl, R. F., and Feltz, L. V., “Wind tunnel performance data for two-and three-bucket Savonius rotors”. Springfield, VA, USA: Sandia Laboratories, 1977.

Kacprzak, K., Liskiewicz, G., and Sobczak, K., “Numerical investigation of conventional and modified Savonius wind turbines”, Renewable energy, Vol. 60, pp. 578-585, 2013.

Sanusi, A., Soeparman, S., Wahyudi, S., and Yuliati, L., “Experimental Study of Combined Blade Savonius Wind Turbine”, International Journal of Renewable Energy Research, Vol. 6(2), pp. 614-619, 2016.

Roy, S. and Saha, U. K., “Wind tunnel experiments of a newly developed two-bladed Savonius-style wind turbine”, Applied Energy, Vol. 137, pp. 117-125, 2015.

Mahmoud, N. H., El-Haroun, A. A., Wahba, E., and Nasef, M. H., “An experimental study on improvement of Savonius rotor performance”, Alexandria Engineering Journal, Vol. 51(1), pp. 19-25, 2012.

Yaakob, O., Suprayogi, D., Ghani, M. A., and Tawi, K., “Experimental Studies on Savonius-type Vertical Axis Turbine for Low Marine Current Velocity”, International Journal of Engineering-Transactions A: Basics, Vol. 26(1), pp. 91-98. 2012.

Hayashi, T., Li, Y. and Hara, Y., “Wind tunnel tests on a different phase three-stage Savonius rotor”, JSME International Journal Series B Fluids and Thermal Engineering, Vol. 48(1), pp. 9-16, 2005.

Rus, T., Rus, L. F., Abrudan, A. C., Domnita, F. V. and Mare, R., “Experimental tests in equipping vertical axis wind turbines with electric Generator”, International Journal of Renewable Energy Research Vol. 6(2), pp. 465-471, 2016.

Jeon, K. S., Jeong, J. I., Pan, J. K. and Ryu, K. W., “Effects of end plates with various shapes and sizes on helical Savonius wind turbines”, Renewable Energy, 79, 167-176, 2015.

Kamoji, M. A., Kedare, S. B., and Prabhu, S. V., “Experimental investigations on single stage modified Savonius rotor”, Applied Energy, 86(7), 1064-1073, 2009.

Golecha, K., Eldho, T. I. and Prabhu, S. V., “Influence of the deflector plate on the performance of modified Savonius water turbine”, Applied Energy, 88(9), 3207-3217, 2011.

Lee, Jae-Hoon, Young-Tae Lee, and Hee-Chang Lim.,”Effect of twist angle on the performance of Savonius wind turbine”, Renewable Energy, Vol. 89, pp. 231-244, 2016.

Sahim, K., Santoso, D. and Sipahutar, R. “Performance of combined water turbine Darrieus-Savonius with two stage Savonius buckets and single deflector”, International Journal of Renewable Energy Research, vol. 5(1), pp. 217-221, 2015.


  • There are currently no refbacks.

Online ISSN: 1309-0127


ijrereditor@gmail.com; ilhcol@gmail.com;

IJRER is cited in SCOPUS, EBSCO, WEB of SCIENCE (Thomson Reuters)