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Session: Experiments
Session starts: Tuesday 08 October, 15:40
Presentation starts: 15:40
Room: Willem Burger Zaal

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Andrea Spinelli (Politecnico di Milano)
Vincenzo Dossena (Politecnico di Milano)
Paolo Gaetani (Politecnico di Milano)

Abstract:
The Test Rig for Organic Vapors (TROVA) represents a novel facility built with the purpose of providing experimental data on the typical expansion flows taking place within organic Rankine cycle (ORC) turbines. The facility has been built at the Fluid-dynamics of Turbomachines Laboratory of Politecnico di Milano (Italy), in collaboration with Turboden s.r.l.. It consists in a blow down facility in which an organic vapour is expanded from a high-pressure reservoir, kept at controlled supeheated or supercritical conditions, into a low-pressure reservoir, where the vapour is condensed and pumped back to the high pressure reservoir. Expansion from subsonic to supersonic speeds occurs through a converging-diverging Laval nozzle, which has been chosen as the test section for initial tests. The test rig can also accommodate liner blade cascade, as it is required by later experiments, and can operate with different working fluids of interest for ORC applications. Within the test section the flow field can be characterized by independent measurements of pressure, temperature, and velocity, allowing also to verify the consistency of thermodynamic models currently employed to predict the typical real-gas behaviour of ORC turbine flows. The present paper describes the commissioning of the TROVA, illustrates the test section setup and the adopted measurement techniques, and finally presents the early tests.\\