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Supercritical flow profile improvement by means of a convex corner at a bend inlet / Mohammad Reza Jaefarzadeh in Journal of hydraulic research, Vol. 50 N° 6 (Novembre/Décembre 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 6 (Novembre/Décembre 2012) . - pp. 623-630 Titre : Supercritical flow profile improvement by means of a convex corner at a bend inlet Type de document : texte imprimé Auteurs : Mohammad Reza Jaefarzadeh, Auteur ; Ali Reza Shamkhalchian, Auteur ; Mahboobeh Jomehzadeh, Auteur Année de publication : 2013 Article en page(s) : pp. 623-630 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bend  Convex  corner  Oblique  wave  Roe's  method  Supercritical  flow  Transition Résumé : A novel method for the reduction of wave height along the outer wall of a bend is introduced by adding a convex corner to the inner bend wall. The negative waves emitted from the convex corner are then superimposed on the positive waves caused by the outer bend wall. The interaction of positive and negative waves transforms the original single-humped wave along the outer wall to a lower double-humped wave. The optimum expansion angle of the convex corner is a function of the offset width to the bend width, the radius of curvature to the bend width, and the approach flow Froude number. Numerical studies indicate that the convex corner may be used in a wide range of safe conditions free from cavitation damage. By using an optimized convex corner, the wave height may be reduced between 10 and 45%. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.719200 [article] Supercritical flow profile improvement by means of a convex corner at a bend inlet [texte imprimé] / Mohammad Reza Jaefarzadeh, Auteur ; Ali Reza Shamkhalchian, Auteur ; Mahboobeh Jomehzadeh, Auteur . - 2013 . - pp. 623-630. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 6 (Novembre/Décembre 2012) . - pp. 623-630 Mots-clés : Bend  Convex  corner  Oblique  wave  Roe's  method  Supercritical  flow  Transition Résumé : A novel method for the reduction of wave height along the outer wall of a bend is introduced by adding a convex corner to the inner bend wall. The negative waves emitted from the convex corner are then superimposed on the positive waves caused by the outer bend wall. The interaction of positive and negative waves transforms the original single-humped wave along the outer wall to a lower double-humped wave. The optimum expansion angle of the convex corner is a function of the offset width to the bend width, the radius of curvature to the bend width, and the approach flow Froude number. Numerical studies indicate that the convex corner may be used in a wide range of safe conditions free from cavitation damage. By using an optimized convex corner, the wave height may be reduced between 10 and 45%. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.719200