Annular flow duct for a turbomachine through which a main...

F - Mech Eng,Light,Heat,Weapons – 01 – D

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F01D 5/14 (2006.01) F04D 27/02 (2006.01) F04D 29/68 (2006.01)

Patent

CA 2653836

The invention relates to an annular flow duct for a turbomachine, said flow duct being arranged concentrically about a machine axis running in the axial direction and being defined by a boundary wall of circular cross section for directing a main flow, wherein the boundary wall has a plurality of return flow passages which are distributed over its circumference and through which in each case a partial flow which can be detached from the main flow at a bleed position can be returned to the main flow at a feed position situated upstream of the bleed position, and having aerofoils, arranged radially in the flow duct, of a blade ring, the aerofoil tips of which lie opposite the boundary wall, with a gap being formed in each case, wherein the aerofoils are movable in a predetermined rotation direction along the circumference of the boundary wall. In order to specify a compressor which is insensitive to pumping and flow separations, it is proposed that - as viewed in rotation direction - the bleed position of each return flow passage lie upstream of the corresponding feed position.

L'invention concerne un conduit (18) d'écoulement annulaire pour une turbomachine, lequel est disposé de manière concentrique autour d'un axe (2) de machine s'étendant dans le sens axial et est limité par une paroi (22, 24) de délimitation à section transversale circulaire afin de conduire un courant (26) principal, la paroi (22, 24) de délimitation présentant plusieurs passages (46) de reflux distribués sur le pourtour à travers lesquels un courant (49) partiel, pouvant à chaque fois être découplé du courant (26) principal en un point (50) de prélèvement, peut être réacheminé au courant (26) principal en une position (52) d'injection qui se trouve en amont du point (50) de prélèvement, et comprenant des pales (32) d'une couronne d'aubes disposées en forme de faisceau dans le conduit (18) d'écoulement dont les pointes (42) de pale sont à l'opposé de la paroi (22, 24) de délimitation à chaque fois en formant un interstice, les pales (32) pouvant se déplacer dans un sens (U) de rotation prédéfini le long du pourtour de la paroi (22, 24) de délimitation. Pour indiquer un compresseur insensible au pompage et au décollement des filets d'air, il est proposé que, vu dans le sens (U) de rotation, le point (50) de prélèvement de chaque passage de reflux se trouve avant la position (52) d'injection correspondante.

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