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Asymmetric self-circulation processing case with slotting position of parabola distribution for centrifugal compressor

A centrifugal compressor and casing processing technology, which is applied in the direction of machines/engines, pumping devices for elastic fluids, mechanical equipment, etc., can solve the problem that the non-axisymmetric flow field inside the compressor cannot be considered, and the flow parameters are affected , Unable to deal with issues such as the optimal stability expansion effect of the casing, to achieve the effect of improving the stable working range and maintaining efficiency

Active Publication Date: 2010-06-16
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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 consider the non-axisymmetric characteristics of the internal flow field of the compressor, so it is impossible to achieve the optimal expansion and stability effect of the processing casing in the entire circumferential direction

Method used

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  • Asymmetric self-circulation processing case with slotting position of parabola distribution for centrifugal compressor
  • Asymmetric self-circulation processing case with slotting position of parabola distribution for centrifugal compressor
  • Asymmetric self-circulation processing case with slotting position of parabola distribution for centrifugal compressor

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Embodiment Construction

[0019] The principle, structure and working process of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] The asymmetrical self-circulation treatment casing of the centrifugal compressor whose slotting position is parabolic contains a compressor volute, and a suction ring groove 1, a diversion ring groove 2 and a return ring groove are arranged on the wall surface of the compressor volute 3. The suction ring groove, the diversion ring groove and the return ring groove form a self-circulation channel, which is characterized in that the distance S between the front end of the suction ring groove and the leading edge of the compressor impeller main flow blade 4 r It is a parabolic distribution in the circumferential direction, that is, S r =A(α·D-β·D) 2 +A 0 ,

[0021] Among them, A is the characteristic parameter of the parabola, and the value range of A is determined according to the impeller diameter D of the centri...

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Abstract

The invention discloses an asymmetric self-circulation processing case with slotting position of parabola distribution for a centrifugal compressor, relating to a processing case of a centrifugal compressor, and belonging to the technical field of impeller machineries. A self-circulation channel is formed by arranging a pumping and sucking ring slot, a reflow ring slot and a guide ring slot on the wall surface of a compressor volute casing, and the distance Sr from the front end face of the pumping and sucking ring slot to the front edge of a main stream blade of a compressor impeller is in parabola distribution on the circumference direction to optimize the stability enhancing effect of the asymmetric self-circulation processing case on the centrifugal compressor. By adopting the asymmetric self-circulation processing case with the slotting position of parabola distribution for the centrifugal compressor, compared with the shaft symmetric self-circulation processing case with consistent slotting width on the circumference direction, the stable working range of the centrifugal compressor can be greatly improved while the efficiency is maintained unchangeable.

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, resulting in unstable operation, stalling or even surge, which directly leads to a sharp drop in compressor efficiency and pressure ratio, and severely shortens the service life, or even short-term directly damaged. Therefore, people have adopted many methods to delay the occur...

Claims

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Application Information

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IPC IPC(8): F04D29/42
CPCF04D29/685F04D29/4213
Inventor 郑新前林韵张扬军马场隆弘玉木秀明杨名洋
Owner TSINGHUA UNIV
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