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REAL-GAS EFFECTS IN ORC TURBINE FLOW SIMULATIONS ( real-gas-effects-in-orc-turbine-flow-simulations )

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European Conference on Computational Fluid Dynamics ECCOMAS CFD 2006 P. Wesseling, E. On ̃ate and J. P ́eriaux (Eds) ⃝c TU Delft, The Netherlands, 2006 REAL-GAS EFFECTS IN ORC TURBINE FLOW SIMULATIONS: INFLUENCE OF THERMODYNAMIC MODELS ON FLOW FIELDS AND PERFORMANCE PARAMETERS P. Colonna∗, S. Rebay†, J. Harinck∗ and A. Guardone†† ∗Process and Energy Department, Delft University of Technology Mekelweg, 2, 2828 CD Delft, The Netherlands, e-mail: P.Colonna@3mE.TUdelft.nl †Dipartimento di Ingegneria Meccanica, Universit`a di Brescia Via Branze, 38, 25123 Brescia, Italy ††Dipartimento di Ingegneria Aerospaziale, Politecnico di Milano Via La Masa, 34, 20159 Milano, Italy Key words: Turbomachinery, organic Rankine cycle, siloxane, dense gas, real gas, Euler solver, equations of state Abstract. The analysis and design of turbomachinery is usually performed by means of fluid dynamic computations employing ideal gas laws. This can lead to inaccurate predictions for Organic Rankine Cycle (ORC) turbines, which operate partly in the non- ideal thermodynamic region. The objective of this work is to evaluate the influence of different equations of state (EoS) on the computed aerodynamic performance and the test case is a 2D nozzle blade of an existing ORC turbine operated with the siloxane MDM as working fluid. Three different fluid models are considered, the simple polytropic ideal gas law, the Peng-Robinson-Stryjek-Vera cubic EoS and the state-of-the-art Span-Wagner EoS. A comparison of the computed Mach number and pressure coefficient distribution along the blade as well as the outlet flow angles, mass flows and loss estimations for both design and off-design operating conditions is presented. The fluid dynamic results are very similar for the computations employing the Span-Wagner and Peng-Robinson- Stryjek-Vera EoS. The calculations performed with the polytropic ideal gas EoS, on the other hand, show large relative differences in almost all parameters, if compared to the accurate Span-Wagner EoS. 1 INTRODUCTION In most cases, performance assessments and designs of turbomachinery are based on computational fluid dynamics (CFD) simulations employing the ideal gas law to describe the fluid thermodynamic properties. This choice is based on the assumption that the deviation of the real thermodynamic behavior from ideality is small, which should result in 1



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