调节阀内瞬态空化压力脉动特性分析  

Transient cavitation pressure fluctuation characteristics in regulating valve

作　　者：刘秀梅[1] 谢永伟 李贝贝[1] 贺杰 陈劲松 LIU Xiumei;XIE Yongwei;LI Beibei;HE Jie;CHEN Jinsong(School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Electrical and Control Engineering,Xuzhou University of Technology,Xuzhou 221018,China)

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116 [2]徐州工程学院电气与控制工程学院,江苏徐州221018

出　　处：《振动与冲击》2022年第19期282-288,共7页Journal of Vibration and Shock

基　　金：江苏省优势学科平台。

摘　　要：基于计算流体动力学方法,数值研究了液压调节阀内瞬态流动及其压力脉动特性。通过对近壁面的压力信号进行频谱分析,讨论空化形态的变化过程与壁面压力波动之间的关系。结果表明:调节阀内云状空穴变化呈现出准周期性的发展过程,空化频率为565 Hz,其空化变化过程包括:附着型空穴生长、附着型空穴断裂和脱落以及游离型空穴生长和溃灭;空穴尾部近壁面处的逆压力梯度是引起反向射流的主要原因,反向射流与主流相切形成漩涡,促使附着型空穴脱落;此外,空穴发展变化也对流道内压力脉动产生影响,阀内不同截面上的平均压力变化具有相同的主导频率,且该频率与附着型空穴非定常准周期生长、断裂、脱落频率基本吻合。Here,based on computational fluid dynamics(CFD),transient flow and pressure pulsation characteristics in hydraulic regulating valve were numerically studied.Through spectral analysis of pressure signals near wall surface,the relation between cavitation morphology change process and wall pressure fluctuation was discussed.The results showed that changes of cloud-like cavities inside regulating valve reveal a quasi-periodic development process,and their cavitation frequency is 565 Hz,their cavitation change processes include of growth of attached cavities,fracture and fall off of attached cavities,and growth and collapse of free cavities;reverse pressure gradient at cavity tail near wall is the main reason to cause reverse jet,reverse jet is tangent to main stream to form a vortex,and make attached cavity fall off;development and change of cavities also have an impact on pressure pulsation inside runner,average pressure changes on different cross-sections inside valve have the same dominant frequency,and this frequency basically agrees well with unsteady quasi-periodic growth,fracture and shedding frequencies of attached cavities.

关 键 词：调节阀 非定常空化流动 反向射流 压力脉动 数值模拟 

分 类 号：TH137.52[机械工程—机械制造及自动化]