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Centrifugal compressor using asymmetrical bladed diffuser with variable blade consistencies in circumferential direction

A centrifugal compressor, blade consistency technology, applied in the direction of machines/engines, pumping devices for elastic fluids, mechanical equipment, etc., can solve the problem of reducing diffuser efficiency, local flow instability, and deterioration of flow instability and other problems, to achieve the effect of improving flow stability, reducing non-uniformity, and uniform flow field

Active Publication Date: 2017-08-18
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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 works at a small flow rate, the uneven flow field causes large-scale flow separation in some parts of the vane diffuser. phenomenon, causing flow loss, reducing diffuser efficiency, and causing 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 surge phenomenon in the compressor

Method used

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  • Centrifugal compressor using asymmetrical bladed diffuser with variable blade consistencies in circumferential direction
  • Centrifugal compressor using asymmetrical bladed diffuser with variable blade consistencies in circumferential direction
  • Centrifugal compressor using asymmetrical bladed diffuser with variable blade consistencies in circumferential direction

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Embodiment Construction

[0015] The present invention proposes a centrifugal compressor that adopts an asymmetric vaned diffuser with variable blade consistency in the circumferential direction, and its structure is as follows: figure 1 As shown, it includes a casing 7, a centrifugal impeller 3, a back plate 5 and a diffuser 4. The casing 7 is relatively fixed to the back plate 5 , and the outer end of the casing 7 forms a volute flow channel 6 . The centrifugal impeller 3 and the diffuser 4 are coaxially installed, the centrifugal impeller 3 is driven by the rotating shaft 2 of the centrifugal compressor, and the diffuser 4 is composed of a plurality of diffuser blades 8, such as figure 2 As shown in , a plurality of diffuser blades are fixed on the casing 7 or the back plate 5 along the circumference, flow passages are formed between two adjacent diffuser blades, and the thickness S of the diffuser blades installed along the circumference i for:

[0016]

[0017] Among them, i is the flow chan...

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Abstract

The invention relates to a centrifugal compressor using an asymmetrical bladed diffuser with variable blade consistencies 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 bladed mounting angles are evenly distributed in the circumferential direction, the blade consistencies are asymmetrically distributed in the circumferential direction, and the consistencies are unequal in different circumferential positions. The blade consistencies are changed by changing the central angles (namely the front edge interval between every two adjacent blades) corresponding to flow channels. The compressor can effectively adapt to the downstream circumferential pressure distortion of the bladed diffuser, the nonuniformity of a flow field in the bladed 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 variable blade consistency in the circumferential direction, and belongs to the technical field of impeller machinery. Background technique [0002] The present invention relates to a centrifugal compressor adopting an asymmetric vaned diffuser with variable blade consistency in the circumferential direction, and relates to centrifugal compressors for superchargers for various purposes such as vehicles, ships, and aviation, as well as aviation, industry, power generation, etc. Centrifugal compressors for various purposes such as turboshaft and turboprop engines. [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 fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44F04D29/66
CPCF04D29/444F04D29/667
Inventor 郑新前孙振中张美杰川久保知己玉木秀明
Owner TSINGHUA UNIV
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