Axial compressor

Abstract

An axial compressor includes: a cylindrical casing; a rotor rotatably disposed in the casing; rotor blades arranged on an outer circumferential surface of the rotor around a central axis of the rotor; stationary blades arranged on an inner circumferential surface of the casing at a position adjacent to and behind the rotor blades in an axial direction, each stationary blade having a tip opposing the rotor and having a chord length defined between a leading edge and a trailing edge of the tip; and at least one bleed passage having a bleed opening that opens out in the outer circumferential surface of the rotor. The bleed opening opens at a position located ahead of a position axially spaced rearward from the leading edges of the tips of the stationary blades by one half of the chord length in such a manner that the bleed opening faces toward the tips.

1 . An axial compressor, comprising:
 a cylindrical casing;   a rotor rotatably disposed in the casing;   multiple rotor blades arranged on an outer circumferential surface of the rotor at a predetermined pitch around a central axis of the rotor;   multiple stationary blades arranged on an inner circumferential surface of the casing at a position adjacent to and behind the rotor blades in an axial direction of the rotor, each stationary blade having a tip opposing the rotor and having a chord length defined between a leading edge and a trailing edge of the tip; and   at least one bleed passage having a bleed opening that opens out in the outer circumferential surface of the rotor,   wherein the bleed opening opens at a position located ahead of a position axially spaced rearward from the leading edges of the tips of the stationary blades by one half of the chord length in such a manner that the bleed opening faces toward the tips.   
     
     
         2 . The axial compressor according to  claim 1 , wherein the bleed opening is located axially rearward of the leading edges of the tips of the stationary blades by 10-20% of the chord length. 
     
     
         3 . The axial compressor according to  claim 1 , wherein the at least one bleed passage comprises multiple bleed passages arranged around the central axis of the rotor at a regular pitch. 
     
     
         4 . The axial compressor according to  claim 1 , wherein the at least one bleed passage extends from the bleed opening obliquely rearward at a predetermined angle relative to the axial direction of the rotor. 
     
     
         5 . The axial compressor according to  claim 4 , wherein the predetermined angle is in a range from 20 to 40 degrees.