Performance of Double-step Savonius Rotor for Environmentally Friendly Hydraulic Turbine

Authors :: Miyoshi Nakajima
Shouichiro Iio
Toshihiko Ikeda
Source :: Journal of Fluid Science and Technology, Vol 3, Iss 3, Pp 410-419 (2008)
Publication Year :: 2008
Publisher :: The Japan Society of Mechanical Engineers, 2008.
Abstract: The aim of this investigation is to develop an environmentally friendly nano-hydraulic turbine. Three type models of Savonius rotor are constructed and tested in a water tunnel to improve and clarify the power performance. Flow field around the rotor is examined visually to reveal the enhancement mechanisms of power coefficient using the double-step rotor. Flow visualization showed the difference of flow patterns at the central section between the standard (single-step) rotor and the double-step one. A meandering flow in the axial direction of the rotor was observed only for the double-step rotor. This flow had the pressure restoration effect at the returning blade's concave side and the torque strengthened effect at the advancing blade's convex side. As a consequence, the power coefficient was 10% improved.<br />Article<br />Journal of Fluid Science and Technology. 3(3):410-419 (2008)

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