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Experimental and numerical analysis of a variable area ratio steam ejector / Szabolcs Varga in International journal of refrigeration, Vol. 34 N° 7 (Novembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 7 (Novembre 2011) . - pp. 1668-1675 Titre : Experimental and numerical analysis of a variable area ratio steam ejector Titre original : Analyse numérique et expérimentale d’un éjecteur de vapeur à ratio de section variable Type de document : texte imprimé Auteurs : Szabolcs Varga, Auteur ; Armando C. Oliveira, Auteur ; Xiaoli Ma, Auteur Année de publication : 2011 Article en page(s) : pp. 1668-1675 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Ejector  system  Performance  Computational  fluid  dynamics  Experimentation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In the present paper, experimental and CFD results for a 5 kW capacity steam ejector with variable primary nozzle geometry are presented and compared. The variable geometry was achieved by applying a movable spindle at the primary nozzle inlet. Operating conditions were considered in a range that would be suitable for an air-conditioning application, with thermal energy supplied by vacuum tube solar collectors. The CFD model was based on the axi-symmetric representation of the experimental ejector, using water as working fluid. The experimental entrainment ratio varied in the range of 0.1–0.5 depending on operating conditions and spindle tip position. It was found that the primary flow rate can be successfully adjusted by the spindle. CFD and experimental primary flow rates agreed well, with an average relative error of 7.7%. CFD predicted the secondary flow rate and entrainment ratio with good accuracy only in 70% of the cases. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002951 [article] Experimental and numerical analysis of a variable area ratio steam ejector = Analyse numérique et expérimentale d’un éjecteur de vapeur à ratio de section variable [texte imprimé] / Szabolcs Varga, Auteur ; Armando C. Oliveira, Auteur ; Xiaoli Ma, Auteur . - 2011 . - pp. 1668-1675. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 7 (Novembre 2011) . - pp. 1668-1675 Mots-clés : Ejector  system  Performance  Computational  fluid  dynamics  Experimentation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In the present paper, experimental and CFD results for a 5 kW capacity steam ejector with variable primary nozzle geometry are presented and compared. The variable geometry was achieved by applying a movable spindle at the primary nozzle inlet. Operating conditions were considered in a range that would be suitable for an air-conditioning application, with thermal energy supplied by vacuum tube solar collectors. The CFD model was based on the axi-symmetric representation of the experimental ejector, using water as working fluid. The experimental entrainment ratio varied in the range of 0.1–0.5 depending on operating conditions and spindle tip position. It was found that the primary flow rate can be successfully adjusted by the spindle. CFD and experimental primary flow rates agreed well, with an average relative error of 7.7%. CFD predicted the secondary flow rate and entrainment ratio with good accuracy only in 70% of the cases. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002951