基于Fluent滑动网格对非全周开口滑阀阀口空化现象的研究  

Research on Cavitation Phenomenon of Non-full-circumference Opening Spool Valve Port Based on Fluent Sliding Grid

作　　者：李森林 杨胜清 陈乾鹏[1,2] LI Sen-lin;YANG Sheng-qing;CHEN Qian-peng(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Province Research Center of Hydraulics and Pneumatics Engineering Technology,Lanzhou 730050,China;Guangxi Liugong Machinery Co.,Ltd.,Liuzhou 545007,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学甘肃省液压气动工程技术研究中心,甘肃兰州730050 [3]广西柳工机械股份有限公司,广西柳州545007

出　　处：《液压气动与密封》2021年第1期28-34,共7页Hydraulics Pneumatics & Seals

基　　金：国家自然科学基金(51575254)。

摘　　要：该文主要研究了湍流方程黏度修正函数、流体湍动能、油液流动方向、阀口开启行为对于阀口空化现象的影响以及空化现象对于阀口输出质量流量的影响。该文以滑阀非全周阀口中的K型阀口为研究对象,利用Fluent滑移网格模型、Zwart空化模型和黏度修正函数、湍动能修正函数展开该文的研究。研究结果表明:湍流方程黏度项修正后,阀口近壁面处出现了速度更大、范围更广的回射流,进而改变空泡形状;考虑湍动能在空化现象的影响后,计算域内的空化量会增加;油液流动方向不仅会影响阀口空化的形态,空化发生的位置也会影响阀口输出的质量流量大小;当空化发生在节流槽内部时,空化气体会堵塞阀口降低阀口的有效过流面积,进而影响阀口的输出流量;阀口开度的变化会影响空化发生的位置数量以及强度;由于气液两相的密度差异,空化的不稳定性会影响阀口输出流量的不稳定性。This paper mainly studies the influence of viscosity correction function of turbulence equation,turbulent kinetic energy of fluid,flow direction of oil,opening behavior of valve port on cavitation phenomenon of valve port and the influence of cavitation phenomenon on output mass flow of valve port.In this paper,the K-type valve port in the non-full circumference valve port of slide valve is taken as the research object,and Fluent sliding mesh model,Zwart cavitation model,viscosity correction function and turbulent kinetic energy correction function are used to carry out this research.The results show that after the viscosity term of the turbulence equation is corrected,a jet with larger velocity and wider range appears near the valve port wall,thus changing the shape of the cavitation bubble.Considering the influence of turbulent kinetic energy on cavitation phenomenon,the amount of cavitation in the computational domain will increase.The direction of oil flow will not only affect the cavitation pattern of the valve port,but also the position where cavitation occurs will affect the mass flow output by the valve port.When cavitation occurs inside the throttling groove,cavitation gas will block the valve port and reduce the effective flow area of the valve port,thus affecting the output flow rate of the valve port.The change of valve port opening will affect the number and intensity of cavitation positions.Due to the density difference between gas and liquid phases,the instability of cavitation will affect the instability of valve port output flow.

关 键 词：黏度修正函数 空化 非全周阀口 阀口流量 

分 类 号：TH137[机械工程—机械制造及自动化]