Compressor case bleed air structure, bleed air method and aero-engine

Abstract

The invention relates to an air-inducing structure of a casing of a compressor, an air-inducing method and an aeroengine. Wherein, the air-inducing structure includes an inner casing, and a plurality of air-inducing passages for connecting the inner casing and the air-collecting cavity are arranged along the circumference of the inner casing; A flow vane includes a leading edge, a trailing edge, a pressure surface and a suction surface, the radius of curvature of the leading edge of the guide vane is not less than the radius of curvature of the trailing edge of the guide vane, and the trailing edge of the guide vane faces toward the The orientation of the bleed air channels is the same. The above bleed air structure, bleed air method, and aeroengine at least include the advantages of high bleed air efficiency, simple structural strength design, efficient and stable operation, and the like.

Description

technical field [0001] The invention relates to an air-inducing structure of an air compressor casing, an air-inducing method and an aero-engine. Background technique [0002] In the field of aero-engine and gas turbine, inter-stage bleed is one of the simplest compressor stability expansion methods. This method is to change the axial partial velocity of the airflow entering the compressor, that is, to change the air flow entering the compressor. That is to say, a certain amount of gas needs to be extracted from the main flow to realize anti-breathing of the compressor or provide gas source for cooling the turbine. [0003] Under the current technical conditions, bleed air is mainly realized by arranging bleed air passages (grooves) on the compressor casing and the rotor drum. The bleed air channel located at the casing is usually directly connected to the gas collection chamber, and the gas in the main flow directly enters the gas collection chamber. The movement of gas ...

AI Technical Summary

Problems solved by technology

[0005] 1. Without any guidance, the speed and direction of the airflow are formed spontaneously according to the actual flow field conditions, which may cause separation, vortices, etc. in the flow field and affect the flow efficiency, for example figure 2 As shown in the schematic diagram of flow in the bleed air channel A-A section, there will be flow turbulence in the bleed air channel;

[0006] 2. There is a certain deviation between the direction of the airflow and the direction of the bleed air channel, resulting in an incomplete match between the two, and the airflow cannot enter the air collection cavity smoothly;

[0007] 3. Due to the existence of the above defects, in order to achieve sufficient bleed air volume, the required bleed air channel area is relatively large, which will bring difficulties to the structural strength design of the casing

Images