Rotary Drum of an Axial Compressor Having a Composite Web

Abstract

A rotary drum of an axial compressor having a web made of composite material has an upstream flange for fastening the fan, a segment having a sealing flange upstream, a segment with a groove adapted to receive the bases of the vane of a first row of vanes, a segment with a groove adapted to receive the bases of the vane of a second row of vanes, and a segment with a groove adapted to receive the bases of the vane of a third row of vanes. These segments are made of metallic material mostly for reasons of mechanical resistance to the centrifugal forces. The segments are connected to each other with web segments made of composite material. The ends of the metallic segments have a dovetail-shaped section in a longitudinal plane that is able to ensure a positive connection with the composite material.

1 . A rotary drum of an axial turbomachine, comprising:
 a first segment;   a second segment; and   a third segment adjacent to the first segment and the second segment, the third segment forming a web for connecting the first segment to the second segment;   wherein the first segment, the second segment, and the third segment form a generally symmetrical wall revolving about a longitudinal axis; and   wherein the third segment is made of composite material and is connected to at least one of the first segment and the second segment by molding the composite material onto an end of at least one of the first and the second segment.   
     
     
         2 . The rotary drum according to  claim 1 , wherein at least one of the first segment and the second segment is adapted to receive a row of vanes. 
     
     
         3 . The rotary drum according to  claim 1 , wherein at least one of the first and the second segment comprises:
 a cavity in the form of a circular groove adapted to receive bases of the vanes.   
     
     
         4 . The rotary drum according to  claim 3 , wherein the cavity includes a section that is diminished toward the outside of the cavity, so as to enable a fixation by mechanically embedding the bases of vanes. 
     
     
         5 . The rotary drum according to  claim 1 , wherein the end of each segment in contact with the composite material of the third segment has a shape that facilitates the connection between such segment and the third segment. 
     
     
         6 . The rotary drum according to  claim 1 , wherein the end of each segment in contact with the composite material of the third segment has a section in a longitudinal plane in the form of a dovetail. 
     
     
         7 . The rotary drum according to  claim 1 , wherein the third segment has a generally constant thickness between the connecting areas with the first segment and the second segment. 
     
     
         8 . The rotary drum according to  claim 1 , wherein the composite material of the third segment covers both the outer surface and the inner surface of the end of each segment connected thereto. 
     
     
         9 . The rotary drum according  claim 1 , wherein the third segment comprises:
 at least one knife edge on an outer surface thereof, the knife edge being adapted to cooperate with a ring made of abradable material of a guide vane grid in order to ensure sealing.   
     
     
         10 . The rotary drum according to  claim 1 , wherein at least one of the first segment and the second segment is made of a metallic material. 
     
     
         11 . The rotary drum according to  claim 10 , wherein at least one of the first segment and the second segment is made of titanium. 
     
     
         12 . A method for manufacturing a rotary drum of an axial turbomachine, comprising:
 providing a first segment;   providing a second segment, distinct from the first segment;   setting the first segment and the second segment in place about a longitudinal axis; and   providing a third segment made of composite material, the third segment forming a connection web between the first segment and the second segment.   
     
     
         13 . The method according to  claim 12 , comprising:
 using a device to set the first segment and the second segment in place and to form the connection web between the first segment, the second segment, and the third segment.   
     
     
         14 . The method according to  claim 13 , wherein the device comprises:
 a means for molding the third segment.   
     
     
         15 . The method according to  claim 13 , wherein the device comprises:
 a means for counter-molding the third segment.   
     
     
         16 . The method according to  claim 12 , wherein the forming a connection web between the first segment, the second segment, and the third segment comprises:
 applying a composite material on at least one of an outer surface and an inner surface of the end of at least one of the first segment and the second segment.   
     
     
         17 . The method according to  claim 12 , wherein the forming a connection web between the first segment, the second segment, and the third segment comprises:
 providing a rib on an outer surface of the third segment adapted to cooperate with a ring made of abradable material of a guide vane grid to ensure sealing.