Large Eddy Simulations of Strongly Non-Ideal Compressible Flows through a Transonic Cascade

Jean-Christophe Hoarau, Paola Cinnella and Xavier Gloerfelt
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Jean-Christophe Hoarau: Laboratoire DynFluid, Arts et Métiers Institute of Technology, 75013 Paris, France
Paola Cinnella: Institut Jean Le Rond D’Alembert, Sorbonne Université, 75005 Paris, France
Xavier Gloerfelt: Laboratoire DynFluid, Arts et Métiers Institute of Technology, 75013 Paris, France

Energies, 2021, vol. 14, issue 3, 1-20

Abstract: Transonic flows of a molecularly complex organic fluid through a stator cascade were investigated by means of large eddy simulations (LESs). The selected configuration was considered as representative of the high-pressure stages of high-temperature Organic Rankine Cycle (ORC) axial turbines, which may exhibit significant non-ideal gas effects. A heavy fluorocarbon, perhydrophenanthrene (PP11), was selected as the working fluid to exacerbate deviations from the ideal flow behavior. The LESs were carried out at various operating conditions (pressure ratio and total conditions at inlet), and their influence on compressibility and viscous effects is discussed. The complex thermodynamic behavior of the fluid generates highly non-ideal shock systems at the blade trailing edge. These are shown to undergo complex interactions with the transitional viscous boundary layers and wakes, with an impact on the loss mechanisms and predicted loss coefficients compared to lower-fidelity models relying on the Reynolds-averaged Navier–Stokes (RANS) equations.

Keywords: non-ideal gas flow; turbine cascade; large eddy simulation; Organic Rankine Cycle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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