Turbomachine compressor

摘要

A turbomachine compressor including variable-pitch vanes including an aerofoil section connected by a mounting plate of circular outline to a pivot guided in rotation in an orifice in a casing is disclosed. The mounting plate of the vane includes at least one notch for bleeding air from the compressor stream. The notch is intended to communicate with a hole in the casing in order to remove the air bled off when the vanes are in a first position, and to be closed off by this casing when the vanes are in a second position, so that the flow rate of bled air depends on the pitch angle of the vanes.

主权项

1. A turbomachine compressor, comprising:
an annular casing; an air duct; and at least one stator stage formed by an annular row of variable-pitch blades disposed into said air duct, each blade having an airfoil section connected at at least one end to a radial cylindrical pivot by a mounting plate having an approximately circular contour, said radial cylindrical pivot being guided in rotation in an orifice in the annular casing, each blade being rotatable about an axis defined by the pivot of the blade between a first position and a second position, wherein the mounting plates of at least some of the blades each have an orifice for bleeding air out of the air duct of the compressor, the orifices, which directly communicate with the air duct of the compressor, with no passage for said air through the blades, communicating with holes which are formed through the casing and which evacuate said bleeding air out of the air duct when the blades are in the first position and being closed off by the casing when the blades are in the second position, such that the air bleed flow rate depends on the pitch angle of the blades.