基于流固耦合方法的大口径闸阀减振分析  

Vibration reduction analysis of large-diameter gate valve based on fluid-solid coupling method

作　　者：张伟政[1,2] 黄文彬 张俊涛 ZHANG Weizheng;HUANG Wenbin;ZHANG Juntao(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Wenzhou Pump and Valve Engineering Research Institute,Lanzhou University of Technology,Wenzhou 325105,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105

出　　处：《甘肃科学学报》2024年第6期144-152,共9页Journal of Gansu Sciences

摘　　要：针对大口径楔式闸阀在启闭过程及小开度工况下易引起流激共振,产生较强的阀杆和闸板振动的问题,提出在阀后添加扩管的结构优化方法,以降低流体流态突变进而减小共振,并给出了3种具体的改进方式。通过对比分析改进前后闸阀管道液流系统的压力脉动、共振幅值,验证优化的可行性。研究结果表明:阀后添加扩管能够减小阀后涡旋和压力脉动,使阀内流体更快的趋于稳定;优化后阀门在1/16和1/8开度下的共振幅值由26.819 mm和2.347 mm减小为10.036 mm和1.959 8 mm,极大地降低了阀门在小开度下的共振幅值,有效减小了共振对阀门的损伤。压力脉动大幅值集中在小开度下低频区内(50 Hz),且脱落涡频率为26.72 Hz和28.44 Hz,当阀门系统处于二阶和四阶模态时,易产生涡激共振,应该避免在小开度工况及相应的频率范围内工作。研究结果可为大口径闸阀的减振优化提供参考。The large-diameter gate valve in the closing process and small opening conditions are easy to cause flow resonance,resulting in strong vibration of the valve stem and valve plate.This paper proposed the structural optimization method of adding pipe expansion after the valve to reduce the sudden change of the fluid flow state to reduce the resonance,and it gave three specific ways of improvement.The feasibility of optimization is analyzed by comparing the pressure pulsation and resonance amplitude of the liquid flow system in the gate valve pipeline before and after optimization.The results of the study demonstrate that the addition of an expanding tube after the valve can reduce vortex and pressure pulsation after the valve,so that the fluid within the valve will be stabilized faster.After optimization,the amplitude of co-oscillation of the valve at 1/16 and 1/8 opening is reduced from 26.819 mm and 2.347 mm to 10.036 mm and 1.959 8 mm,which greatly reduces the amplitude of co-oscillation of the valve in a small opening,and effectively reduces of resonance damage to valves.The large value of pressure pulsation is concentrated in the low frequency range(50 Hz) under small opening,and the shedding vortex frequencies are 26.72 Hz and 28.44 Hz,which are prone to flow-excited resonance when the valve system is in the second-order and fourth-order modes,so that it should be avoided to work in the small-opening condition and corresponding frequency range.The results of the study can provide a reference for optimizing the optimization of vibration damping of large-diameter gate valves.

关 键 词：大口径闸阀 流固耦合 共振特性 减振优化 

分 类 号：TH134[机械工程—机械制造及自动化]