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Numerical Study of Multistage Transcritical Organic Rankine Cycle Axial Turbines

Article dans une revue avec comité de lecture
Auteur
CINNELLA, Paola
134975 Laboratoire de Dynamique des Fluides [DynFluid]
ccSCIACOVELLI, Luca

URI
http://hdl.handle.net/10985/10145
DOI
10.1115/1.4026804
Date
2014
Journal
Journal of Engineering for Gas Turbines and Power

Résumé

Transonic flows through axial, multi-stage, transcritical ORC turbines, are investigated by using a numerical solver including advanced multiparameter equations of state and a high-order discretization scheme. The working fluids in use are the refrigerants R134a and R245fa, classified as dense gases due to their complex molecules and relatively high molecular weight. Both inviscid and viscous numerical simulations are carried out to quantify the impact of dense gas effects and viscous effects on turbine performance. Both supercritical and subcritical inlet conditions are studied for the considered working fluids. In the former case, flow across the turbine is transcritical, since turbine output pressure is subcritical. Numerical results show that, due to dense gas effects characterizing the flow at supercritical inlet conditions, supercritical ORC turbines enable, for a given pressure ratio, a higher isentropic efficiency than subcritical turbines using the same working fluid. Moreover, for the selected operating conditions, R134a provides a better performance than R245fa.

Fichier(s) constituant cette publication

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GTP-14-1031.pdf
Taille:
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Format:
PDF
Description:
postprint
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  • Dynamique des Fluides (DynFluid)

Documents liés

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  • Numerical investigation of dense gas flows through transcritical multistage axial Organic Rankine Cycle turbines 
    Communication avec acte
    CINNELLA, Paola; ccSCIACOVELLI, Luca (2013)
    Many recent studies suggest that supercritical Organic Rankine Cycles have a great potential for lowtemperature heat recovery applications, since they allow better recovery efficiency for a simplified cycle architecture. ...
  • Thermochemical non-equilibrium effects in turbulent hypersonic boundary layers 
    Article dans une revue avec comité de lecture
    PASSIATORE, Donatella; CINNELLA, Paola; GIUSEPPE, Pascazio; ccSCIACOVELLI, Luca (2022-04-28)
    A hypersonic, spatially evolving turbulent boundary layer at Mach 12.48 with a cooled wall is analysed by means of direct numerical simulations. At the selected conditions, massive kinetic-to-internal energy conversion ...
  • Numerical Investigation of High‑Speed Turbulent Boundary Layers of Dense Gases 
    Article dans une revue avec comité de lecture
    PASSIATORE, Donatella; CINNELLA, Paola; GRASSO, Francesco; ccSCIACOVELLI, Luca; ccGLOERFELT, Xavier (Springer, 2020-03)
    High-speed turbulent boundary layers of a dense gas (PP11) and a perfect gas (air) over flat plates are investigated by means of direct numerical simulations and large eddy simulations. The thermodynamic conditions of the ...
  • A high-order scheme for the numerical simulation of high-enthalpy hypersonic flows 
    Communication avec acte
    ccPASSIATORE, Donatella; ccSCIACOVELLI, Luca; ccCINNELLA, Paola; ccPASCAZIO, Giuseppe (ICCFD, 2022-07)
    A high-order shock-capturing finite-difference scheme for scale-resolving numerical simulations of hypersonic high-enthalpy flows, involving thermal non-equilibrium effects, is presented. The suitability of the numerical ...
  • Numerical investigation of hypersonic turbulent boundary layers with high-temperature effects 
    Communication avec acte
    ccPASSIATORE, Donatella; ccSCIACOVELLI, Luca; ccCINNELLA, Paola; ccPASCAZIO, Giuseppe (Council of the Aeronautical Sciences, 2022-11)
    A hypersonic turbulent boundary layer over a flat plate is numerically investigated. The large Mach number and temperature values in the freestream (M e = 12.48 and T e = 594.3 K, respectively) lead to a high-enthalpy ...

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