Device for adjusting intake air for a centripetal compressor

Details Device for adjusting intake air for a centripetal compressor Device for adjusting intake air for a centripetal compressor

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 5/08 (2006.01) F04D 29/54 (2006.01) F04D 29/58 (2006.01)

Patent

CA 2416157

The invention provides an axial compressor for a turbomachine, the compressor being fitted with a device (2) for centripetally bleeding turbine-cooling air from a stream (5) of air flowing through said compressor, said compressor comprising two rings of moving blades (4, 7) extending radially outwards from the peripheries of two consecutive disks (3, 6) joined together by an outer shroud (9) having holes (14), and further comprising a fixed ring of stator vanes (8) placed in the stream (5) between said moving rings of blades, said holes serving as air inlets to said bleed device and opening out into an annular groove (12) provided beneath the interstice (13) separating the inner platforms (11) of the stator vanes (8) from the rim of the upstream disk, said groove communicating with said stream via said interstice, wherein the groove (12) is fitted with fixed air guide means (20) imparting centripetal swirling motion on the air flowing in said groove (12), the motion rotating in the same direction as the compressor so as to reduce the velocity of the air entering into the holes (14) relative to said rotating holes. These guide means comprise guide profiles fixed beneath the inner platforms (11) of the stator vanes (8).

L'invention concerne un compresseur axial de turbomachine équipé d'un dispositif (2) de prélèvement centripète d'air dans la veine (5) dudit compresseur, cet air étant destiné au refroidissement de la turbine, ledit compresseur comportant deux couronnes d'aubes mobiles (4, 7) qui s'étendent radialement vers l'extérieur à la périphérie de deux disques consécutifs (3, 6) assemblés par une virole extérieure (9) munie de perçages (14) et une couronne d'aubes redresseuses (8) fixes disposée dans la veine (5) entre lesdits deux couronnes d'aubes mobiles, lesdits perçages servant d'entrées d'air audit dispositif de prélèvement et débouchant dans une gorge annulaire (12) prévue sous l'interstice (13) séparant les plates-formes intérieures (11) des aubes redresseuses (8) de la jante du disque amont, ladite gorge communiquant avec ladite veine par ledit interstice, caractérisé en ce que la gorge (12) est équipée de moyens de guidage fixes (20) imprimant au flux d'air circulant dans ladite gorge (12) un mouvement tourbillonnaire centripète dans le sens de rotation du compresseur afin de diminuer la vitesse relative de l'air entrant dans les perçages (14) par rapport auxdits perçages en rotation. Ces moyens de guidage comportent des profils d'aubage fixés sous les plates-formes intérieures (11) des aubes redresseuses (8).

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