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Visualization investigation on the expansion state of the primary flow in a transcritical CO2 two-phase ejector.

Étude de visualisation de l’état d’expansion de l’écoulement principal dans un éjecteur diphasique au CO2 transcritique.

Numéro : pap. n. 725

Auteurs : LI Y., DENG J., MA L., et al.

Résumé

The expansion state of the primary flow in a two-phase ejector plays an important role in the pressure distribution and phase change position in the primary nozzle. A two-phase CO2 visualization ejector was designed to investigate the expansion state of the primary flow under various operating conditions and nozzle diverging angles. The results showed that the pressure drop scope in the primary nozzle increased as the secondary flow pressure decreased, and the secondary flow pressure had an insignificant effect on the phase change position in the primary nozzle. With increasing the nozzle diverging angle, the expansion of the primary flow was strengthened resulting in a larger pressure drop in the primary nozzle, and the primary flow shifted from the under-expanded state to the over-expanded state. The study was significant to understand the working mechanism of a two-phase CO2 ejector and provide a reference for the ejector optimum design.

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Pages : 8

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Détails

  • Titre original : Visualization investigation on the expansion state of the primary flow in a transcritical CO2 two-phase ejector.
  • Identifiant de la fiche : 30026024
  • 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.2019.0725

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