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Performance analysis of a novel adjustable-range ejector based on a thermodynamic model. 

Auteurs : WANG F., SHEN Z. X., WANG L. H.

Type d'article : Article de la RIF

Résumé

To extend the operational range of ejectors and maintain performance stability during the critical-to-subcritical transition, this study proposes a novel ejector configuration with a supplementary injection structure to enhance its compression performance. First, a one‑dimensional theoretical model to predict its critical back pressure is established based on flow mechanisms and conservation laws, and calibrated using validated CFD simulations with a focus on determining the mixing efficiency coefficient of the supplementary mixing process. The pres surization mechanism is then elucidated by comparing axial flow parameters between the novel and conven tional configurations. Furthermore, the effects of the operational and geometric parameters of the supplementary nozzle on compression performance are systematically investigated under different primary‑ and secondary‑flow temperatures. The results indicate that the prediction error of the established theoretical model is less than 4 % under the studied conditions. The performance improvement of the novel ejector mainly stems from a two‑stage energy conversion process. An optimal supplementary flow angle of 30 ◦ is identified, and any deviation from this angle leads to reduced mixing efficiency for the supplementary mixing process. Increasing the supplementary flow pressure or enlarging the supplementary nozzle throat area enhances the ejector’s compression capability by injecting additional energy and momentum into the ejector. This study provides theoretical insights and a new approach for the optimized design and engineering application of high-performance ejectors.

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Format PDF

Pages : 10

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  • Prix public

    20 €

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    Gratuit

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Détails

  • Titre original : Performance analysis of a novel adjustable-range ejector based on a thermodynamic model. 
  • Identifiant de la fiche : 30034933
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 187
  • Date d'édition : 07/2026
  • DOI : http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2026.106920

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