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Session: Poster Session and Sponsors Exhibition
Session starts: Thursday 22 September, 14:00

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Piero Colonna (Process and Energy Department, TU Delft)
Mauro Gallo (Process and Energy Department, TU Delft)
Emiliano Casati (Process and Energy Department, TU Delft)
Tiemo Mathijssen (Process and Energy Department, TU Delft)
Paolo Repetti (Politecnico di Milano, Dipartimento di Ingegneria Aerospaziale)

Abstract:
The Flexible Asymmetric Shock Tube setup has been designed and built at the Process and Energy Laboratory of the Delft University of Technology in order to study non-classical gasdynamic phenomena in flows of dense organic fluid vapors [1]. It operates according to the Ludwieg tube principle. One of the main objectives is the detection of rarefaction shock waves, which are theoretically predicted to occur at operating conditions close to the vapour-liquid critical point in the superheated vapor thermodynamic region of so called BZT fluids [2]. Fluids of the siloxanes family qualify as BZT fluids therefore they are employed in the FAST setup [3]. Siloxanes are also working fluids for organic Rankine cycle power plants [4]. Gasdynamic measurements performed with the FAST setup are therefore also relevant especially for the aerodynamic design of ORC expanders. The FAST can be operated at temperatures up to 400 °C and pressures up to 30 bar. The current status with respect to the commissioning of the setup is illustrated. In addition the FAST laboratory has been recently equipped with Laser-based diagnostics for flow visualization and measurements. The experience gained in handling siloxanes and the FAST setup triggered interest into the design of a new test rig for flow measurements in transonic flows around blade shapes, with the objective of accurately validating an in-house CFD code for flows of dense organic vapors in conditions typical of ORC turbo-expanders. Preliminary results of the initial design process are described and discussed.