Noise-reducing turbomachine nozzle

Details Noise-reducing turbomachine nozzle Noise-reducing turbomachine nozzle

F - Mech Eng,Light,Heat,Weapons

02

C

F02C 7/045 (2006.01) F02C 7/24 (2006.01) F02K 1/48 (2006.01)

Patent

CA 2469847

A nozzle comprising an inner barrel (6), a centre body (4)disposed inside the inner barrel so as to define a first channel (10) for a primary flow, and an outer barrel (12) surrounding the inner barrel so as to define a second annular channel for a secondary flow, the free end (14) of the inner barrel (6) presenting a surface (18) having a first series of undulations made up of negative undulations (20) alternating with positive undulations (22), the centre body (4) presenting a second series of undulations made up of negative undulations (26) alternating with positive undulations (28), the negative (20, 26)and positive undulations (21, 28) of the series of undulations being of radial height that varies angularly and being disposed in such a manner that the negative undulations (20) of the first series are disposed facing negative undulations (26) of the second series, and vice versa, so as to generate turbulence and radial shear between the primary and secondary flows while conserving a constant flow section around the entire circumference of the nozzle.

Tuyère comportant un capot primaire (6), un corps central (4) disposée à l'intérieur du capot primaire afin de définir un premier canal (10) pour l'écoulement d'un flux primaire, et un capot secondaire (8) entourant le capot primaire (6) afin de définir un second canal (12) pour l'écoulement d'un flux secondaire, l'extrémité libre (14) du capot primaire (6) présentant une surface (18) comportant une première série d'ondulations formée d'ondulations négatives (20) en alternance avec des ondulations positives (22), le corps central (4) présentant une seconde série d'ondulations formée d'ondulations négatives (26) en alternance avec des ondulations positives (28), les ondulations négatives (20, 26) et positives (22, 28) des séries d'ondulations ayant une hauteur radiale variant angulairement et étant disposées de sorte que les ondulations négatives (20) de la première série sont disposées en vis à vis des ondulations négatives (26) de la seconde série et inversement afin de générer entre les flux primaire et secondaire une turbulence et un cisaillement radial tout en conservant une section transversale constante sur toute la circonférence de la tuyère.

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