3D radial inflow turbine design and analysis for a small scale ORC application

Abstract

In this study, the aim is to design and analyze a single stage subsonic radial in- ow turbine for the Organic Rankine Cycle system established in Bogazici University Renewable Energy Technologies Laboratory, by using R245fa and R134a as the working uids. Complete design process of the ORC turbine, from preliminary design to 3D blade design stage, is presented. Design point of the turbine is determined according to the cycle limitations and by comparing the maximum mach number, rotational speed and mass ow rate parameters found as a result of detailed preliminary turbine design and basic cycle analysis. Results of the streamline and CFD analysis of the designed turbine are compared and discussed from the point of Mach number distribution, turbine e ciency and power output. The comparison shows that the two analyses give similar e ciencies, power outputs and Mach number distributions. Streamline analyses results show that the maximum total to static turbine e ciency and power output are 87.5 % and 3.97 kW respectively.