Centrifugal compressor asymmetric self-circulation treatment casing based on varied notching width

Abstract

A centrifugal compressor asymmetric self-circulation treatment casing based on varied notching position relates to a centrifugal compressor treatment casing and belongs to impeller machinery technical field. The treatment casing mainly comprises a compressor volute casing and a self-circulation channel machined on the wall surface of the volute casing in circumferential direction; the self-circulation channel is composed of a pumping annular slot, a backflow annular slot, a diversion annular slot and a blocking block; the distance from the front end surface of the pumping annular slot to the front edge of the main impeller is in non-axial symmetric distribution along the circumferential direction of the casing for optimizing the stability enhancing effect in the full circumferential direction of the casing treatment. Compared with the axially-symmetric self-circulation treatment casing with consistent notching position in the circumferential direction, the centrifugal compressor asymmetric self-circulation treatment casing based on varied notching position can greatly improve the stable working range of the centrifugal compressor and also and maintains efficiency basically the same.

Description

technical field [0001] The invention relates to a treatment casing of a centrifugal compressor, which belongs to the technical field of impeller machinery. It can be used in impeller machinery such as supercharger centrifugal compressors, industrial centrifugal compressors, and aviation centrifugal compressors for various purposes. Background technique [0002] Compared with the reciprocating compressor, impeller compressors such as centrifugal compressors have the advantages of high efficiency, light volume and weight, and stable operation, but their working conditions are limited. Large-scale flow separation occurs in the internal flow field of the centrifugal compressor under low-flow conditions, and unstable operation occurs, causing stall or even surge, which directly leads to a sharp drop in compressor efficiency and pressure ratio, and severely shortens the service life, even short directly damaged. Therefore, people have adopted many methods to delay the occurrence...

AI Technical Summary

Problems solved by technology

However, the traditional processing casing structure is generally axisymmetric structure

When the compressor is in non-design working conditions, the axial asymmetry of the centrifugal compressor volute causes the circumferential distortion of the impeller outlet flow, which affects the upstream flow parameters, resulting in The internal circumferential flow parameters are non-axisymmetric

The traditional axisymmetric processing casing structure cannot take into account the non-axisymmetric characteristics of the internal flow field of the compressor, so the casing processing cannot be optimized in the entire circumferential direction.

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