Effect of Concentrator, Blade Diameter and Blade Number on the Savonius Wind Turbine Performance


  • Ida Bagus Alit Mechanical Department, Mataram University, Jl. majapahit no. 62, Mataram, NTB, 83125, Indonesia
  • Rudy Sutanto
  • I Made Mara
  • Mirmanto Mirmanto




Savonius wind turbine, concentrators, concentration ratio, power coefficient


Savonius turbine is a type of vertical-axis wind turbines. The turbine has a potential to be developed as it has a simple construction and is suitable for low wind speeds. However, the turbine is still rarely used because of the low efficiency of the turbine compared to other turbines. The low efficiency of the turbine is due to the negative moment. Some efforts have been done to reduce the negative moment such as by adding a wind concentrator. The wind concentrator can steer the incoming wind toward the turbine blades that generate positive moments, consequently, the generated power increases. The aim of this research is to determine the effect of the number and diameter of the Savonius blade wind turbine with an additional concentrator. The concentrator had a concentration ratio of 6:1 and it was tested at the lower wind speeds of 2-5 m/s. The result shows that adding a wind concentrator can increase the rotational speed of the rotor, power coefficient, and the turbine power. The Savonius turbine with two blades has the best performance compared to the three and four blades. The Savonius blade wind turbine with the rotor diameter of 12 cm is the best Savonius turbine for the concentration ratio of 6:1.


I.I. Paraschivoiu, Wind turbine design, Presses Internatinales Polytechnique, Canada, 2002.

J.V. Akwa, H.A. Vielmo and A.P. Petry, A review on the performance of savonius wind turbines, Renewable and Sustainable Energy Review, Vol. 16, No. 5, pp. 3054-3064, 2012.

H.A. Ali, Experimental comparison study for Savonius wind turbine of two & three blades at low wind speed, Int.J. Modern Research IJMER, Vol. 3, No. 5, pp. 2978-2986, 2013.

A. Vaishali, S.A. Patil and A.A. Thakur, Optimization of Savonius rotor for wind turbine, Int. J. Advances in Engineering and Technology, Vol. 7, No. 4, pp. 1294-1299, 2014.

Z. Driss, A. Damak and M.S. Abid, Evaluation of the Savonius wind rotor performance for different external overlap ratio, Int. J. Fluids Mechanics & Thermal Sciences, Vol. 1, No. 1, pp. 14-19, 2015.

L.F. Rus, Experimental study on the increase of the efficiency of vertical wind turbines by equipping them with wind concentrators, J. Sustainable Energy, Vol. 3, No. 1, pp. 30-35, 2012.

S.C. Balineni, S.R. Krisnha, B.S. Kumar and G.V. Kumar, Design and fabrication of Savonius vertical axis wind turbin, Department of Mechanical Engineering Gokaraju Rangaraju Institute of Engineering and Technology, Jawaharlal Nehru Technological University, 2011.

C.R. Patel, V.K. Patel, S.V. Prabhu and T.I. Eldho, Investigation of overlap ratio for Savonius type vertical axis hydro turbine, Int. J. Soft Computing and Engineering (IJSCE), Vol. 3, No. 2, pp. 379-383, 2013.

E. Hau, Wind Turbines, Springer, New York, 2006.

M. D’Ambrosio and M. Medaglia, Vertical axis wind turbines, History, Technology and Applications, Högskolan Halmstad, 2010.

B.D. Altan and M.A. Atilgan, A study on increasing the performance of Savonius wind rotors, Int. J. Mechanical Science and Technology, Vol. 26, No. 5, pp. 1493-1499, 2012.

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




How to Cite

Alit, I. B., Sutanto, R., Mara, I. M., & Mirmanto, M. (2017). Effect of Concentrator, Blade Diameter and Blade Number on the Savonius Wind Turbine Performance. Asian Journal of Applied Sciences, 5(2). https://doi.org/10.24203/ajas.v5i2.4610