大流量气体管道中阀门诱发振动机理研究

Mechanisms of valve-induced vibration in a gas pipeline with large flow rate

以某大型化工厂气体管道阀门小开度工况下的振动管路为例,系统介绍了振动激励源的发现与振动的抑制方法。考虑复杂管系支撑对管系固有频率的影响,采用模态分析得到管系模态频率与模态振型。采用CFD模拟方法,对管道内部气体流场进行模拟,得到气体压力脉动频率。结果发现,阀后流体脉动是引起管道振动的主要原因。在此基础上,提出了在阀后增设隔板的减振措施,减振效果明显。

Taking the vibration in one gas piping system with small opening ratio as an example, the methods of discovering excitation source and suppressing vibration were introduced systematically. Modal analysis was employed to analyze the modal frequency and modal shape of the pipeline system, CFD simulation was used to study the gas flow in pipes. It was suggested that fluid pulsation after valve was responsible for the severe pipe vibration and it can be suppressed effectively by inserting plates into the downstream of the valve.