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A computer study of surface diffusion on the HUB and shroud of a centrifugal compressor / Mahfoud Kadja

Public ISBD Titre : A computer study of surface diffusion on the HUB and shroud of a centrifugal compressor Type de document : texte imprimé Auteurs : Mahfoud Kadja, Auteur ; C. Bosman, Directeur de thèse Editeur : Manchester : [s.n.] Année de publication : 1983 Importance : 52 f. Présentation : ill. Format : 30 cm. Note générale : Master of Science : Mechanical engineering : University of Manchester : 1983 Bibliogr. f. 53 - 57. Annexe [60] f Langues : Anglais (eng) Mots-clés : Computer  study Surface  diffusion Centrifugal  compressor Flow  in  turbomachines Index. décimale : Ms01083 Résumé : A computer program developed by previous M.Sc students (1,2) has been applied to solve the equations governing the steady, inviscid and adiabatic flow on a hub to shroud (S2) streamsurface of the Eckardt centrifugal compressor. The effects on the relative velocity distributions on the hub and shroud (and thus on the losses in the compressor) of varying the hub, shroud and blade shapes - for the same load on the Compressor - were investigated. In trying to lessen surface diffusion in the Compressor, it was found that neither the shroud nor the blade shapes have a significant effect on diminishing flow deceleration along the hub and shroud and that only the hub shape need be varied to significantly reduce the diffusion. A hub shape which leads to a much reduced diffusion than in the original Eckardt Compressor was therefore found by "trial and error". Finally, a second computer program developed by another M.Sc. student (4), was used to assess the merits of the different designs obtained by varying the hub or shroud or blade shapes over the original design of the Eckardt centrifugal compressor. This was done by comparing the turbulent boundary layer characteristics (i.e. form factor, displacement thickness, momentum thickness and energy thickness) on the hub and shroud of the compressors. It was found that the design having a "trial and error hub" can be expected to experience more energy losses but to have a much higher operating flexibility than the original design of the Eckardt compressor. A computer study of surface diffusion on the HUB and shroud of a centrifugal compressor [texte imprimé] / Mahfoud Kadja, Auteur ; C. Bosman, Directeur de thèse . - Manchester : [s.n.], 1983 . - 52 f. : ill. ; 30 cm. Master of Science : Mechanical engineering : University of Manchester : 1983 Bibliogr. f. 53 - 57. Annexe [60] f Langues : Anglais (eng) Mots-clés : Computer  study Surface  diffusion Centrifugal  compressor Flow  in  turbomachines Index. décimale : Ms01083 Résumé : A computer program developed by previous M.Sc students (1,2) has been applied to solve the equations governing the steady, inviscid and adiabatic flow on a hub to shroud (S2) streamsurface of the Eckardt centrifugal compressor. The effects on the relative velocity distributions on the hub and shroud (and thus on the losses in the compressor) of varying the hub, shroud and blade shapes - for the same load on the Compressor - were investigated. In trying to lessen surface diffusion in the Compressor, it was found that neither the shroud nor the blade shapes have a significant effect on diminishing flow deceleration along the hub and shroud and that only the hub shape need be varied to significantly reduce the diffusion. A hub shape which leads to a much reduced diffusion than in the original Eckardt Compressor was therefore found by "trial and error". Finally, a second computer program developed by another M.Sc. student (4), was used to assess the merits of the different designs obtained by varying the hub or shroud or blade shapes over the original design of the Eckardt centrifugal compressor. This was done by comparing the turbulent boundary layer characteristics (i.e. form factor, displacement thickness, momentum thickness and energy thickness) on the hub and shroud of the compressors. It was found that the design having a "trial and error hub" can be expected to experience more energy losses but to have a much higher operating flexibility than the original design of the Eckardt compressor.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms01083	Ms01083	Papier	Bibliothèque centrale	Mémoire de Master	Disponible