基于气流激振的离心式压缩机管道破坏机理研究

大型石化压缩机组中，管道易产生气流激振作用下的疲劳破坏。本文从气流激振的产生与作用机理进行分析，研究管道疲劳破坏的主要来源-声共振。采用实验室的管道声腔进行仿真分析，应用LMS仿真软件有限元法对管道内部的声模态进行计算，获取其特征频率，并进行实验测试分析，当叶片的通过频率与管道声模态频率一致时将产生声共振，振动将明显增加，揭示了声共振造成的管道疲劳破坏机理。在此基础上，结合实际大型离心式压缩机组管道振动控制的实例，证明了此方法的有效性，为大型离心式压缩机组管道的高周疲劳破坏抑制提供依据。

Investigation on Pipeline Failure for Centrifugal Compressor Based on Fluid Induced Oscillation

The pipeline fatigue by fluid induced oscillation frequently takes place in the large scale centrifugal compressor. This paper investigates the main failure source of centrifugal compressor by fluid induced oscillation analysis. One of pipeline fatigue failure mechanism which could be original from acoustic resonance is investigated. Simulation for the pipeline cavity is analyzed in the test lab. With LMS acoustic finite element method software, the acoustic mode of pipeline is determined. The vibration level will increase typically when the blade passing frequency is the close to the acoustic mode frequency for the reason of acoustic resonance according to experiment analysis. It can give clear demonstration for the pipeline vibration with fluid induced oscillation. A practical centrifugal compressor pipeline vibration control is used to verify the effectiveness by acoustic resonance analysis according to the theory analysis. The research will contribute to development for reduction on centrifugal compressor pipeline damage based on high cycle fatigue.