Laminar flow elbow system

F - Mech Eng,Light,Heat,Weapons – 15 – D

Patent

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F15D 1/04 (2006.01)

Patent

CA 2186254

An improved laminar flow elbow sys- tem and method (10B) wherein the elbow sys- tem comprises a straight pre-pipe section (22) to define the flow path of a fluid; the pipe section included directly prior to the inlet of a curved pipe section (14) and having and com- prising a plurality of vanes (30) to impart a rotation to the fluid before passing through a curved pipe section (14) to provide a generally flat velocity profile at the exit of the curved pipe section and to minimize turbulence of the fluid as it passes through the curved pipe sec- tion, and a substantially straight post-pipe sec- tion (24) to define a flow path exit pipe section included directly at the exit of the curved pipe section, and containing a plurality of vanes (58) to impart a backward rotation movement to the fluid flow from the exit of the curved pipe section to substantially terminate rota- tion of the fluid upon exiting from the straight pipe section without substantial deterioration of the flatness of the fluid velocity profile and without generating substantial amounts of tur- bulence.

La présente invention concerne un système coudé amélioré d'écoulement laminaire et la technique correspondante (10B). Le système à coude en question comprend une section droite (22) en amont du conduit pour définir le trajet d'écoulement du fluide; la section de conduit située directement en amont de l'orifice d'entrée d'une section coudée (14) et comprenant plusieurs aubes (30) pour donner une rotation au fluide avant son passage à travers ladite section coudée (14) afin de donner à la sortie de la section coudée un profil des vitesses globalement plat et de minimiser les turbulences du fluide lors de son passage à travers la section coudée; et une section pratiquement droite (24) en aval du conduit pour définir une section de sortie du trajet d'écoulement, situé juste à la sortie de la section coudée et contenant plusieurs aubes (58) donnant à l'écoulement du fluide un mouvement de rotation en sens inverse dès la sortie de ladite section coudée afin de stopper pratiquement le mouvement de rotation du fluide à la sortie de la section droite du conduit sans trop altérer le profil plat des vitesses du fluide et sans provoquer d'importants niveaux de turbulence.

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