Experimental Study on Improvement The Performance of Savonius Windmill with Ventilated Blade

rudi hariyanto, Sudjito Soeparman, Denny Widhiyanuriyawan, Mega Nur Sasongko


This study aims to determine how much influence the use of fixed ventilation on the blade towards improvements in performance Savonius windmill. Ventilation is made in the form of a reflection on the letter C. The ventilation open into the concave side of the blade. There are one model of the conventional Savonius windmill and six models of the ventilated Savonius windmill that tested in the wind tunnels. Experimental variables are variations in the clearence width of the ventilation, variations in wind speed and variations in rotor rotation. Further more, rotor Savonius turn mini-dynamo (magneto) to get current and voltage. The ventilated Savonius windmill have the average useful power and the power coefficient higher than the conventional Savonius windmill. Especially for the clearance width of ventilation is 0.05 to 0.10 of the diameter of the blade.


wind energy

Full Text:



Ushiyama I, Nagai H. Optimum design configurations and performance of Savoniusrotors. Wind Eng, p:59–75, 1988.


J.W. Twidwell, A.D. Weir, Renewable Energy Resources, The University Press Cambridge, Britain, p. 411, 1985. (http://maxwell.sze.hu/~marcsa/MegujuloEnergiaforrasok/Books/renewable energy resources.pdf)

Altan BD, Atılgan M. An experimental and numerical study on the improvement of the performance of Savonius wind rotor. Energy Convers Manage, p:3425–32, 2008.


Saha UK, Rajkumar MJ. On the performance analysis of Savonius rotor with twisted blades. Renew Energy, p:1776–88, 2006.


Fujisawa, N., Gontoh, F., Pressure Measurements and Flow Visualization Study of a Savonius Rotor, Journal of Wind Engineering

and Industrial Aerodynamics 39, pp. 51-60, 1992. (http://www.sciencedirect.com/science/article/pii/016761059290532F)

Blackwell BF, Sheldahl RE, Feltz LV. Wind tunnel performance data for two- and three-bucket Savonius rotors. Sandia Laboratories, USA, Sand 76-0131 under act AT/29-11; p. 789, 1978.


Alexander AJ, Holownia BP. Wind tunnel tests on a Savonius rotor. J Ind Aerod; p:343–51, 1978.


Mojola OO. On the aerodynamic design of the Savonius windmill rotor. J Wind Eng Ind Aerod, p:223–31, 1985.


Vance W. Vertical axis wind rotors – status and potential. In: Proceedings of the conference on wind energy conversion systems, p. 96–102, 1973.


Saha UK, Thotla S, Maity D. Optimum design configuration of Savonius rotor through wind tunnel experiments. J Wind Eng Ind Aerod, p: 1359–75, 2008.


V. D'Alessandro, Unsteady Aerodynamics of a Savonius wind rotor: a new computational approach for the simulation of energy performance, Elsevier Journals, p.3349 -3363, 2010. (https://www.researchgate.net/publication/239347622_Unsteady_Aerodynamics_of_a_Savonius_wind_rotor_A_new_computational_approach_for_the_simulation_of_energy_performance)

Nakajima, M., Lio, S., Ikeda, T., Performance of Savonius Rotor for Environmentally Friendly Hydraulic Turbine, Journal of Fluid Science and Technology, vol. 3 no. 3, 2008. (https://www.researchgate.net/profile/Shouichiro_Iio/publication/37199759_Performance_of_Savonius_Rotor_for_Environmentally_Friendly_Hydraulic_Turbine/links/5428328a0cf26120b7b5652c.pdf)

Kamoji, MA., Kedare, SB., Prabhu, SV., Experiments Investigations on Single Stage Modified Savonius Rotor, Applied Energy 86, pp. 1064-1073, 2009. (http://citeseerx.ist.psu.edu/viewdoc/download;jsessionid=279652B423B1359CA7706C32B76B13B3?doi=

Akwa JV . Stators Use Influence On The Performance Of A Savonius Wind Rotor Using Computational Fluid Dynamics. Engenharia Térmica (Thermal Engineering), Vol. 10 • No. 01 - 02 • June and December 2011 • p. 63-72. (http://demec.ufpr.br/reterm/ed_ant/18/artigos/233-2012.pdf.)

Sukanta Roy, Saha, UK., Computational study to assess the influence of overlap ratio on static torque characteristics of a vertical axis wind turbine, Elsevier Journals, Procedia Engineering 51, p.694-702, 2013. (http://www.sciencedirect.com/science/article/pii/S1877705813001008)

Gavalda, Jna., Massons, J., Diaz, F., Drag and Lift Coefficients of the Savonius Wind Machine, Wind Engineering vol. 15 no. 5, 1991


Rudi Hariyanto, Sudjito S., Denny W., Mega N.S., Analysis the vortex effect on the performance of Savonius Windmill based on CFD (Computational Fluid Dynamics) Simulation and Video Recording, International Journal of Renewable Energy Resources, p............., 2016.


  • 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)