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Session: Turbo expanders III
Session starts: Tuesday 08 October, 15:40
Presentation starts: 16:20
Room: Van Weelde Zaal

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Giacomo Persico (Politecnico di Milano)
Matteo Pini (Politecnico di Milano)
Vincenzo Dossena (Politecnico di Milano)
Paolo Gaetani (Politecnico di Milano)

Abstract:
The centrifugal turbine architecture represents a promising solution for Organic Rankine Cycle (ORC) Systems, in the small-to-medium power range. A centrifugal machine can better accomplish the high volumetric expansion ratios typical of ORC applications, and allows for assembling a multiplicity of stages in a relatively compact machine A preliminary design exercise proposed by the authors has recently shown the potential of a transonic multistage centrifugal turbine for medium power applications (about 1 MWel). The achieved promising features, however, also depend on the correlations used in the preliminary procedure, and must be assessed with high-fidelity computational methods such CFD. In the present work the aerodynamics and performance of centrifugal turbine cascades are studied by applying a three-dimensional CFD model. The study is focused on a transonic centrifugal turbine stage, designed by applying simple but effective design concepts. The behavior of the stage is analyzed focusing first on the profile aerodynamics, considering both stator and rotor blade rows. Finally the morphology of secondary flows and the three-dimensional effects of the channel flaring are investigated.