某二氧化碳离心压缩机转子次同步振动分析  

Rotor Sub-synchronous Vibration Analysis for A CO_(2) Centrifugal Compressor

作　　者：太兴宇[1] 李云[1] 孟继纲[1] 孙玉莹[1] 肖忠会 马志宏[1] Xing-yu Tai;Yun Li;Ji-gang Meng;Yu-ying Sun;Zhong-hui Xiao;Zhi-hong Ma(Shen Yang Blower Works Group Corporation)

机构地区：[1]沈阳鼓风机集团股份有限公司

出　　处：《风机技术》2021年第5期66-70,I0007,共6页Chinese Journal of Turbomachinery

摘　　要：本文以某二氧化碳离心压缩机为研究对象,对其在试车过程中产生的转子次同步振动现象进行了分析。该压缩机在大流量时就开始发生0.1~0.35倍频的次同步振动,随着出口压力的升高振动加剧,在设计流量时转子振幅已经超过API 617规定的振动极限值。经多次试验情况未有好转。根据该机组转子以及管路的振动特征,判断故障原因是无叶扩压器内产生旋转失速。而通过进一步分析可知,产生旋转失速的原因可能是下游蜗壳结构以及上一级叶轮流场所导致的。从模型级试验结果可知,5#叶轮受回流器的影响,在大流量和小流量区都会出现低频压力脉动,因此,该叶轮是压缩机转子产生次同步振动的原因之一。最终,通过更改5#叶轮回流器叶片的预旋,成功降低了转子的振动幅值,确保机组顺利出厂。This paper takes a CO_(2) centrifugal compressor as the research object,and the sub-synchronous vibration of the rotor is observed during the test.The sub-synchronous vibration of 10-35 percent of running speed appears at the large flow rate,and vibration intensifies as the outlet pressure increases,and the rotor amplitude has exceeded the limit value specified by API 617 at the design flow rate.After several tests and improvements,the situation has not improved.According to the vibration characteristics of the rotor and pipeline of the unit,it is found that the rotating stall in the vaneless diffuser raise the vibration amplitude.By further analysis,the rotating stall may be caused by the structure of the downstream volute and the flow field of the upper stage impeller.Affected by the return channel,the low-frequency pressure pulsation can be observed at large flow in impeller model test.The impeller is one of the reasons for the sub-synchronous vibration of the compressor rotor.Finally,by changing the blade pre-swirl of the return channel of 5#impeller,the vibration amplitude of the rotor is successfully reduced.

关 键 词：二氧化碳离心压缩机 转子次同步振动 旋转失速 无叶扩压器 压力脉动 

分 类 号：TH432[机械工程—机械制造及自动化]