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Performance d’un éjecteur supersonique à gaz avec injection de gouttelettes : comparaison de modélisations thermodynamiques et par mécanique numérique des fluides.

Gas supersonic ejector performance with droplet injection: a combined CFD and thermodynamic modelling approach.

Numéro : pap. n. 61

Auteurs : CROQUER S., PONCET S., AIDOUN Z.

Résumé

The variations in limiting pressure and efficiency of supersonic ejectors when droplets are injected in the vapour core before the diffuser were assessed numerically. Results of a CFD and a thermodynamic model were used for a combined global and local perspective. In comparison with experimental data of a R134a ejector under typical refrigeration conditions, the CFD model predicts the double-choke entrainment ratio with an accuracy of 5% and the thermodynamic model has a deviation of about 18% (Resp. 2.5%) in terms of double-choke entrainment ratio (Resp. limiting pressure). Both models are in excellent agreement in terms of pressure, Mach number and temperature internal profiles. Results show that, for an injection fraction of 10%, the peak pressure in the shock train is reduced by 31%. Nonetheless, the net effect is a reduction of the exergy contained in the main gas as other factors (e.g.: lower main gas temperature) are introduced.

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Pages : 8

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Détails

  • Titre original : Gas supersonic ejector performance with droplet injection: a combined CFD and thermodynamic modelling approach.
  • Identifiant de la fiche : 30026386
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0061

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