초록 ▼

A compressor including at least one cascade of fixed vanes, the vanes of which are mounted on a wall and between them form air-flow passages, and an air bleed system which bleeds air from the passages between two vanes, through openings made in the wall, the openings being discontinuous and each inc

A compressor including at least one cascade of fixed vanes, the vanes of which are mounted on a wall and between them form air-flow passages, and an air bleed system which bleeds air from the passages between two vanes, through openings made in the wall, the openings being discontinuous and each including a plurality of orifices arranged one behind the other in a direction of the air flow. An upstream orifice of each opening has a larger cross-sectional area than downstream orifices of the opening, and a number and cross section of the downstream orifices are adjusted to suit a predetermined bleed-off flow rate.

대표청구항 ▼

1. A compressor comprising: at least one fixed cascade of vanes, the vanes of which are mounted on a wall and between them form airflow passages; andan air bleed system, which bleeds air from the passages between two vanes through openings made in the wall, the openings being discontinuous and each

1. A compressor comprising: at least one fixed cascade of vanes, the vanes of which are mounted on a wall and between them form airflow passages; andan air bleed system, which bleeds air from the passages between two vanes through openings made in the wall, the openings being discontinuous and each opening including a plurality of orifices arranged one behind the other in a direction of the airflow,wherein an upstream orifice of each respective opening has a cross-sectional area which is larger than areas of cross sections of downstream orifices of the respective opening, and a number and cross sections of the downstream orifices are adjusted to suit a predetermined bleed-off suction flow,wherein the number and cross sections of the orifices of an opening depend on a predetermined suction flow generated by the air bleed system, andwherein a number N of orifices of an opening satisfies the following relation: Δβ·(S/C)/(N·D)≦300in which:Δβ represents deviation of the fluid on passage through the cascade of vanes;S/C represents relative pitch of the cascade of vanes, where S is the distance between two successive vanes and C is the chord of a vane; andD represents the predetermined suction flow. 2. The compressor as claimed in claim 1, wherein the upstream orifice of each opening is centered in relation to a position situated laterally near a suction side of a vane and axially at between 10% and 30% of axial length of the vane from its upstream extremity. 3. The compressor as claimed in claim 1, wherein the upstream orifice of at least some of the openings exhibits, through the wall, a shape slanting in a downstream direction. 4. The compressor as claimed in claim 1, wherein the upstream orifice of at least some of the openings exhibits, through the wall, a streamlined shape. 5. An engine, or an aircraft jet engine, comprising at least one compressor and with an air bleed system, incorporating a compressor as claimed in claim 1.