Small scale radial inflow turbine performance maps for ORCs

Here are gathered the different polynomial functions that estimate the performance of a small scale radial inflow turbine function of specific speeds (ns), specific diameters (ds) and pressure ratio (PR). Five sets of functions performed with varying shroud to tip radius ratio (epsilon=r6s/r4=[0.5 0.6 0.7 0.8]) are presented. These polynoms were built with R134a, but as minor differences were found with the use of another organic fluid (R245fa, R600a, R152a), these maps are valid for different working fluids. For more information about the methodology of the map, its boundaries and other features, please refer to the following paper : "SMALL SCALE RADIAL INFLOW TURBINE PERFORMANCE AND PRE-DESIGN MAPS FOR ORGANIC RANKINE CYCLES, V.Mounier, L.E. Olmedo, J. Schiffmann, Energy, 2017"