End Wall Structure and End Wall Treatment Method of Centrifugal Compressor Diffuser

A technology of centrifugal compressors and processing methods, which is applied in the direction of machines/engines, mechanical equipment, liquid fuel engines, etc., can solve the problems of efficiency reduction, expansion of compressor stable working margin, etc., to facilitate processing, expand stable working range, The effect of area reduction

Inactive Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional treatment of the end wall of the deflector is often carried out on the compressor rotor, but it often causes a decrease in efficiency while expanding the stable working margin of the compressor

Method used

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  • End Wall Structure and End Wall Treatment Method of Centrifugal Compressor Diffuser
  • End Wall Structure and End Wall Treatment Method of Centrifugal Compressor Diffuser
  • End Wall Structure and End Wall Treatment Method of Centrifugal Compressor Diffuser

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] 1) First, model the compressor without end wall treatment on the diffuser wheel cover side, and conduct numerical simulation and flow analysis of its internal flow field to determine the dominant flow field structure and flow characteristics in the compressor, Identify the stall-prone areas in the compressor flow path;

[0031] 2) Secondly, according to the area in the compressor flow channel determined in step 1) that is prone to stall, a single deflector groove is opened along the different meridional positions of the compressor diffuser cover side, and modeling and numerical simulation are performed on it to compare different Position guide vane groove expansion effect and its influence on compressor efficiency, determine the best end wall treatment radial position (that is, the best slotting position);

[0032] 3) Then, according to the op...

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Abstract

The invention provides an end wall structure and end wall treatment method of a centrifugal compressor diffuser. The invention comprehensively considers the structural characteristics and internal flow conditions of the centrifugal compressor. The cover side is treated with deflector-type end wall, which provides a return channel for the low-velocity fluid in the top area of ​​the diffuser, and sucks the low-kinetic energy fluid mass into the treatment tank and transports it along the circumference and flow direction of the treatment tank. During this process, only part of the fluid is reinjected into the main flow, the area of ​​the low kinetic energy fluid area is reduced and the flow rate is also increased, which improves the flow condition of the top channel of the diffuser, weakens the blockage of the top channel, and greatly improves the stability of the compressor. operating range, while peak efficiency and pressure ratio have also been improved.

Description

technical field [0001] The invention relates to the technical field of centrifugal compressors, in particular to the treatment of guide vane type end walls of centrifugal compressors. Background technique [0002] Centrifugal compressors have the advantages of small size, high single-stage pressure ratio and simple structure, and are widely used in gas transportation, ventilation and ventilation in metallurgy, petrochemical, refrigeration and power industries. In recent years, with the continuous improvement of people's demand and interest in micro-energy conversion systems, high speed, high pressure ratio, high efficiency, wide working conditions, and miniaturization have become one of the important trends in the development of centrifugal compressors. Their performance presents increasingly demanding requirements. Today's high-speed, high-load development trend poses new challenges to the stable operation of the compressor and its stability expansion technology, especiall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/44
CPCF04D29/444
Inventor 陈雪飞秦国良
Owner XI AN JIAOTONG UNIV
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