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Method and device for monitoring compressor rotation stall

A rotating stall, compressor technology, applied to devices that use fluids, mechanical equipment, machines/engines, etc., can solve problems such as affecting reliability, compressor blade vibration, and limiting the stable working range of the machine.

Active Publication Date: 2021-06-11
大连透平机械技术发展有限公司
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AI Technical Summary

Problems solved by technology

[0003] Rotating stall is an unstable flow induced by local disturbance. It will not only reduce the flow area of ​​the compressor, limit the stable working range of the machine, affect the reliability of operation, and greatly deteriorate the performance of the compressor. It will cause the compressor blades to vibrate violently so that the blades break and cause huge economic losses

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  • Method and device for monitoring compressor rotation stall
  • Method and device for monitoring compressor rotation stall
  • Method and device for monitoring compressor rotation stall

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Embodiment Construction

[0043] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0044] As mentioned in the background technology, at present, through numerical simulation, it is impossible to accurately obtain the relevant frequency spectrum characteristics of the rotating stall, so that it is impossible to effectively and accurately monitor the rotating stall of the compressor. Effective monitoring of rotating stall during operation has become an urgent problem to be solved.

[0045] In order to solve the abo...

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Abstract

The invention discloses a monitoring method and device for compressor rotation stall, which relates to the technical field of equipment fault diagnosis. The main purpose is to accurately and effectively monitor the rotation stall of the compressor based on the pressure pulsation signal during the actual operation of the compressor. . The method comprises: during the actual operation of the compressor, collecting pressure pulsation signals at the impeller inlet and outlet of the compressor in real time; performing Fourier transform analysis, bandpass filtering and envelope demodulation analysis on the collected pressure pulsation signals, Detect whether there is modulation on both sides of the leaf frequency; if so, extract the specific characteristic frequency in the low frequency range of the spectrum after envelope demodulation, and compare the specific characteristic frequency with the rotating speed frequency of the impeller in the pressure pulsation signal spectrum; If the magnitude of the specific characteristic frequency is greater than the magnitude of the rotational speed frequency by a preset multiple, it is determined that the compressor has a rotational stall. The invention is suitable for the monitoring of compressor rotating stall.

Description

technical field [0001] The invention relates to the technical field of equipment fault diagnosis, in particular to a monitoring method and device for compressor rotation stall. Background technique [0002] With the high development of modern industrial production, compressors have been widely used and developed, and occupy a very important position in the national economy, especially in the entire heavy industry system. Sometimes the operating point of the compressor is far away from its design condition, and the airflow compression produces unstable flow, which causes the airflow pressure pulsation in the machine flow channel and pipeline, which leads to strong vibration of the machine and pipeline, and at the same time causes fatigue of machine parts and pipelines The destruction has produced a series of serious consequences. This airflow instability is mainly caused by three reasons, namely rotating stall, unstable inlet vortex and surge, among which the fault caused by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/26F04D15/00
CPCF04D15/0088G01P3/26
Inventor 李宏坤付井强刘长胜杨树华王开宇
Owner 大连透平机械技术发展有限公司
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