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Simulation and exergy analysis of transcritical CO2 ejectors flows using the implicit real gas SU2 solver.

Number: 0869

Author(s) : METSUE A., NESREDDINE H., MONNEY D., BARTOSIEWICZ Y., PONCET S.

Summary

Within the context of global energy saving, the introduction of ejector devices within classical heat pump systems has shown a great potential to improve their performance. Furthermore, carbon dioxide (CO2) is a good candidate natural refrigerant to replace common HydroFluoroCarbons, 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 endeavor, since 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 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 recent literature that implicit solvers are naturally more appropriate to solve highly compressible flows. The wall-resolved Favre-Averaged Navier-Stokes simulations are performed using the Menter Shear Stress Transport 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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Pages: 12 p.

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Details

  • Original title: Simulation and exergy analysis of transcritical CO2 ejectors flows using the implicit real gas SU2 solver.
  • Record ID : 30031677
  • Languages: English
  • Subject: Technology
  • Source: Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Publication date: 2023/08/21
  • DOI: http://dx.doi.org/10.18462/iir.icr.2023.0869

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