基于均值孔隙介质层的阻尼孔壁面摩擦效应研究  

Wall friction effect of damping hole based on mean porous medium layer

作　　者：杨蕾 罗瑜[1] 罗艳蕾[1] YANG Lei;LUO Yu;LUO Yanlei(School of Mechanical Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学机械工程学院,贵州贵阳550025

出　　处：《机电工程》2024年第8期1398-1405,共8页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(52265007);贵州省科技计划项目(黔科合基础-ZK〔2022〕一般87);贵州省科技创新基地建设项目(黔科合中引地〔2023〕010)。

摘　　要：阻尼孔广泛用于各种液压机械系统,其孔径通常在0.3 mm到2 mm之间,这种微小流道的流动不同于常规管道,壁面粗糙度对其流动特性有重要的影响。针对这一问题,以安装在液压电磁换向阀中的阻尼孔为研究对象,采用均值孔隙介质层(PML)模拟了阻尼孔的壁面粗糙度。首先,建立了阻尼孔的物理模型,使用ICEM CFD软件对模型进行了网格划分;然后,构建了流体控制方程以及PML动量方程,求解出了黏性阻力系数和惯性阻力系数;最后,采用了流体仿真软件Fluent,分析了壁面粗糙度对阻尼孔流体流动特性、流体完全发展距离长度以及流体温升的影响。研究结果表明:仿真所得阻力特性与文献中实验所得阻力特性结果一样,采用PML表征壁面粗糙度的方法可行;由于壁面粗糙度,阻尼孔中的流体受到的阻力增大,导致从阻尼孔入口至出口压降增加了2.25%;相同边界条件下,含PML的阻尼孔比光滑阻尼孔的完全发展距离长0.1 mm左右;壁面的发热量平均提高了1.5%。Damping holes were widely used in various hydraulic mechanical systems,with their apertures typically ranging from 0.3 mm to 2 mm.The flow of this tiny flow channel was different from that of conventional pipes,and the wall roughness has an important influence on its flow characteristics.Aiming at the problem of the above issue,the damping hole installed in the hydraulic solenoid reversing valve was taken as the research object,using the porous media layer(PML)to simulate the surface roughness of the damping hole.Firstly,the physical model of the damping hole was established,and the model was meshed using ICEM CFD software.Then,the fluid governing equation and the PML momentum equation were established to solve the viscous resistance coefficient and inertial resistance coefficient.Finally,the fluid simulation software Fluent was used to analyze the influence of wall roughness on the fluid flow characteristics of the damping holes,the length of the complete fluid development distance and the temperature rise of the fluid.The research results show that the resistance characteristics obtained by simulation are the same as those obtained by experiments in the literature,and the method of characterizing the wall roughness by using the value porous medium layer is feasible.Due to surface roughness,the resistance experienced by the fluid in the damping hole increases,resulting in a 2.25%increase in the pressure drop from the inlet to the outlet of the damping hole,and under the same boundary conditions,the damping hole with the PML is about 0.1 mm longer than the complete development distance of the smooth damping hole,and the heat value of the wall is increased by 1.5%on average.

关 键 词：液压电磁换向阀 壁面粗糙度 均值孔隙介质层 微小流道流动 阻尼孔流体流动特性 ICEM CFD软件 

分 类 号：TH137.52[机械工程—机械制造及自动化]