IIR document

Advanced modelling of a transcritical CO2 ejector.

Summary

Two-dimensional unsteady calculations of a transcritical CO2 ejector are performed using a new and well validated density-based solver developed under the OpenFoam library. It is coupled with a tabulated equation of state to evaluate the CO2 properties. A Homogeneous Equilibrium Model and the k-ε closure are chosen as the two-phase and turbulence modellings. Finally, it incorporates a Navier–Stokes characteristic boundary condition to guarantee the accuracy and stability of the simulations. This numerical tool has been extensively validated against experimental data for converging-diverging nozzles and supersonic ejectors. Beyond the characteristic curves of the ejector for different operating conditions, the extended compound-compressible flow theory for real refrigerants is also verified using the present simulations.

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Details

  • Original title: Advanced modelling of a transcritical CO2 ejector.
  • Record ID : 30027908
  • Languages: English
  • Subject: Technology
  • Source: 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants(GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
  • Publication date: 2020/12/07
  • DOI: http://dx.doi.org/10.18462/iir.gl.2020.1041
  • Document available for consultation in the library of the IIR headquarters only.

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