Circumferential staggered self-circulating casing treating method for axial-flow compressor

Abstract

The invention discloses a circumferential staggered self-circulating casing treating method for an axial-flow compressor and aims to solve the technical problem that an existing self-circulating casing treating method is poor in stability extension capacity. The technical scheme includes that a bridge and an air entraining device are provided, and the air entraining device is rotated circumferentially to fit in the flowing direction of absolute air flows of outlets of rotor blade tops and to be staggered in the circumferential direction of an air injector, so that air entraining amount is increased, and the problem that a self-circulating treated casing is poor in stable axial-flow compressor working range extending capability due to the fact that the air entraining device cannot fit in the air flowing direction of the outlets of the rotor blade tops is solved. By circumferentially rotating the air entraining device by a certain angle, the direction of an inlet, on the casing side, of the air entraining device is enabled to fit in the flowing direction of the absolute air flows of the outlets of the rotor blade tops, namely the air flowing direction of the outlets of the rotor blade tops is in alignment with the inlet of the air entraining device, so that air entraining amount is increased, air injecting speed is increased, and the problem that self-circulating treated casing is poor in stable axial-flow compressor working range extending capability is solved.

Description

technical field [0001] The invention relates to a processing method for a self-circulating casing, in particular to a processing method for a circumferentially dislocated type self-circulating casing of an axial flow compressor. Background technique [0002] Treating the casing is one of the effective measures to effectively expand the stable working range of the axial flow compressor. In order to seek a more versatile stability expansion technology, while obtaining a considerable improvement in the stall margin, the original efficiency of the compressor will not be reduced or slightly improved, the document "Compressor Stall Control Through Endwall Recirculation.Proceedings Of ASME Turbo Expo 2004 Power For Land, Sea, And June 14-17, 2004, GT2004-54295" discloses a self-circulating casing treatment method, that is, combining air injection and bleed air on the casing to delay the stall of the compressor. The literature is in The research results on the axial flow compressor...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing self-circulating casing treatment method, which has poor expansion and stability capabilities, the present invention provides a treatment method for axial-flow compressor circumferentially dislocated type self-circulating casing

This method redesigns the bridge and the air-inducing device, and at the same time rotates the air-inducing device along the circumferential direction to adapt to the flow direction of the absolute air flow at the outlet of the rotor blade tip and creates a misalignment with the air-injecting device in the circumferential direction, thereby increasing the amount of air-inducing and solving the problem of air-inducing The device is not suitable for the airflow direction at the outlet of the rotor blade tip, resulting in the problem that the self-circulation processing casing is not strong enough to expand the stable working range of the axial flow compressor

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