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Analyse de la performance d’un éjecteur sous différentes conditions de fonctionnement, prenant en considération la structure de tuyère ajustable.

Ejector performance analysis under overall operating conditions considering adjustable nozzle structure.

Auteurs : CHEN Z., JIN X., DANG C., et al.

Type d'article : Article, Article de la RIF

Résumé

The variable-geometry ejector (VGE) is feasible for unstable heat-source utilization; the ejector can be adjusted to its design point to obtain high efficiency. Moreover, as the adjustable nozzle in the VGE significantly affects the performance of the ejector, a theoretical model is necessary to evaluate VGE performance. In this study, a two-dimensional theoretical model was proposed based on an adjustable-nozzle theory. Method of characteristics was employed to accurately predict the driving-flow development in the mixing section. In addition, the suction-flow velocity distribution on the effective area was considered. The proposed model was validated by employing the data from literature and additional experimental data obtained from a VGE test setup using R134a. The validation result shows that the proposed model predicts the ejector performance accurately; moreover, the model is more adaptive while the nozzle configuration changes. The theoretical model, proposed herein, is practical for the design and application of the VGE.

Documents disponibles

Format PDF

Pages : 274-286

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Ejector performance analysis under overall operating conditions considering adjustable nozzle structure.
  • Identifiant de la fiche : 30022538
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 84
  • Date d'édition : 12/2017
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2017.08.005

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