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Experimental and numerical flow investigation of a centripetal supersonic turbine for organic rankine cycle applications

: Bülten, Björn; Althaus, Wilhelm; Weidner, Eckhard; Stoff, Horst

Volltext urn:nbn:de:0011-n-3721963 (3.9 MByte PDF)
MD5 Fingerprint: 7957e738dbac5d0936825090d3523960
Erstellt am: 12.1.2016

European Turbomachinery Society -EUROTURBO-:
11th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics, ETC 2015. Papers. Online resource : March 23-27, 2015, Madrid, Spain
Madrid, 2015
12 S.
European Conference on Turbomachinery Fluid Dynamics and Thermodynamics (ETC) <11, 2015, Madrid>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer UMSICHT Oberhausen ()
efficiency; fluid dynamics; thermodynamics; turbines; turbomachinery; Effizienzsteigerung; numerische Strömungssimulation; organic rankine cycle (ORC); rankine cycle

The flow inside a new centripetal supersonic turbine for Organic Rankine Cycle (ORC) applications is investigated. The prototype achieved an isentropic internal efficiency of 64 %. Objectives of this work are the localization and reduction of losses inside the turbine. For this reason a numerical flow simulation is validated with measurements of the prototype. It can be concluded that the model implemented in ANSYS CFX 13.0 reproduces the flow realistically because the deviations of several significant quantities are within the experimental uncertainty. The rotor blades are modified and the supersonic flow deflection is corrected to increase the efficiency. In the numerical simulation the efficiency increases by changing the pitch-to-chord ratio, the flare angle and the flow angle at the outlet of the nozzle blades. The improvements yield a subsequently measured isentropic internal efficiency of about 79 % for the second series of the turbine type.