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International Journal of Rotating Machinery
Volume 2019, Article ID 8394191, 14 pages
Research Article

Investigation of Blade Number Effect on Hydraulic Performance of In-Pipe Hydro Savonius Turbine

1Hydraulic Machinery Research Institute, School of Mechanical Engineering, College of Engineering, University of Tehran, P.O. Box 11365/4563, Tehran, Iran
2Institute of Fluid Mechanics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

Correspondence should be addressed to Amir F. Najafi;

Received 28 March 2019; Revised 28 May 2019; Accepted 16 June 2019; Published 22 July 2019

Academic Editor: Ryoichi Samuel Amano

Copyright © 2019 S. Abdolkarim Payambarpour et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Level of utilization of clean energy has grown dramatically in recent years due to increased pollution and environmental issues. For instance, the extra potential energy in water supply system is usually wasted, due to its low capacity. Design of a proper turbine has recently been given more attention by researchers to apply this clean energy. In the present paper, a modified Savonius turbine, suitable for use in a 4-inch pipe, is designed. Turbine with two blades is tested in a laboratory rig and also simulated with the FLUENT software. By matching numerical and laboratory results, simulations are expanded and the blades number effect on turbine performance is studied under determined hydraulic conditions. The flow field around the modified Savonius turbine is interpreted by the 3D streamlines and pressure contours. The obtained results indicate that increasing the turbine blade numbers up to 5 and more causes the turbine efficiency first to rise and then to fall, respectively.