Unsteady Flow through the Gap of Savonius Turbine Rotor

Abstract: The paper presents a numerical analysis of unsteady flow through the p ofa Savonius turbine rotor, performed for varying integral turbine operating pareters calculatedforthecaseunderstudyaswellasobtainedfromexperimentsdescribedintheliterature.Changesin the unsteady flow pattern, including the development and interaction of numerous vortexstructures in the vicinity of the p, and their relevance to the var ying integral pareters arediscussed. We conclude that the structure responsible for the intensity of the flow through thep is a vortex which forms in the vicinity of the p at certain phases of rotor revolution, andthat a possible way to improve the efficiency of operation of a Savonius turbine is to control theintensity of this vortex by modifying the shape of the blade edges in the vicinity of the p. Keywords: Savonius turbine, rotor p, vortices Notation C P – power coefficient C T – torque coefficient D – rotor dieter d – blade dieter e – p width H – rotor height P – power R – blade radius