Simulation and Exergy Analysis of Transcritical CO2 Ejector Flows Using the Implicit Real Gas SU2 Solver

Metsue, Antoine;Bartosiewicz, Yann;Poncet, Sébastien
(2023) 26TH INTERNATIONAL CONGRESS OF REFRIGERATION (ICR) — Location: Paris, France (21.August.2023)

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Authors
  • Metsue, Antoineorcid-logoUCLouvain
    Author
  • Bartosiewicz, Yannorcid-logoUCLouvain
    Author
  • Poncet, SébastienUdS
    Author
Abstract
Within the context of global energy saving, the introduction of ejector devices within the classical heat pump system has shown potential to improve the performance of the latter system. Furthermore, carbon dioxide (CO2) is a good candidate natural refrigerant to replace common HCF’s, albeit introducing additional challenges, such as the high compression required and the need for the system to work under transcritical conditions due to the low critical temperature of the refrigerant. Therefore, CO2 ejector design remains a particular endeavour, due to the fact that the internal flow physics and topology (shock waves, flashing, shock- boundary layer interaction, etc.), are insufficiently understood. Because of the difficulty in performing experiments on CO2 ejectors, computational Fluid Dynamics (CFD) constitutes an appealing alternative to study the aforementioned flow characteristics of the device. In the present study, the density based non-ideal- CFD SU2 solver is used to perform simulations of two-phase supersonic CO2 ejectors. An implicit Euler integration scheme is used, which allows to have significantly lower CPU times compared to the commonly used explicit integration schemes, adding to the fact that it has been shown in the recent literature that implicit solvers are naturally more appropriate to solve highly compressible flows. The Favre-Averaged Navier-Stokes (FANS) wall resolved simulations are performed using the Menter Shear Stress Transport (k-ω SST) turbulence model. Lastly, the exergy tube analysis, previously applied to perfect gas ejector flows, is extended to real gas ejectors, which allows to give insight onto the exergy exchanges within the device.
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Metsue, A., Bartosiewicz, Y., & Poncet, S. (2023). Simulation and Exergy Analysis of Transcritical CO2 Ejector Flows Using the Implicit Real Gas SU2 Solver. 26TH INTERNATIONAL CONGRESS OF REFRIGERATION (ICR), Paris, France. https://hdl.handle.net/2078.5/25166