Centrifugal compressor with asymmetrical vaned diffuser with circumferentially variable vane installation angle

Abstract

The invention relates to a centrifugal compressor using an asymmetrical bladed diffuser with variable mounting angles in the circumferential direction, and belongs to the technical field of turbomachinery. The centrifugal compressor comprises a volute, a centrifugal impeller and the bladed diffuser. The inlet front edge positions and the consistency of the bladed diffuser are evenly distributed in the circumferential direction, the diffuser blade mounting angles are asymmetrically distributed in the circumferential direction, and the diffuser blade mounting angles are unequal in different circumferential positions. The compressor can effectively adapt to the circumferential distortion of front edge airflow angles of blades of the diffuser, the attack angle of local flowing airflow is prevented from being too large, the nonuniformity of a flow field in the diffuser is reduced, the flowing stability of the centrifugal compressor is effectively improved, and the stable working range of the centrifugal compressor is enlarged.

Description

technical field [0001] The invention relates to a centrifugal compressor adopting an asymmetric bladed diffuser with circumferentially variable blade installation angles, and belongs to the technical field of impeller machinery. Background technique [0002] Centrifugal compressor with asymmetric vane diffuser is a centrifugal compressor involving superchargers for various purposes such as vehicles, ships, and aviation, as well as turboshaft and turboprop engines for various purposes such as aviation, industry, and power generation. centrifugal compressor. [0003] Compared with the existing reciprocating piston compressors, impeller compressors such as centrifugal compressors have the advantages of high efficiency, light volume and weight, and stable operation. However, centrifugal compressors have a limited range of operating conditions. Under low flow conditions, due to the increase of the angle of attack at the inlet of the diffuser, resulting in large-scale flow separ...

AI Technical Summary

Problems solved by technology

Due to the existence of volute and other components, the internal flow field of the centrifugal compressor is often non-uniform in the circumferential direction. When the compressor is working at a small flow rate, the uneven flow field will cause the angle of attack of some parts of the bladed diffuser to be too large. , large-scale flow separation occurs, resulting in flow loss, reducing the efficiency of the diffuser, and resulting in local flow instability; when the flow rate is further reduced, the flow instability is further deteriorated, resulting in larger-scale flow separation and even gas backflow, which induces compression machine surge phenomenon

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