基于CFD的电液伺服阀污染磨损耐久性仿真分析  

Durability Simulation of Electro-Hydraulic Servo Valve under Contaminant Wear with CFD

作　　者：张坤[1] 姚金勇[1] 姜同敏[1] 殷熙中 

机构地区：[1]北京航空航天大学可靠性与系统工程学院,北京100191 [2]陕西秦峰液压有限责任公司,陕西汉中723099

出　　处：《液压与气动》2014年第4期54-59,共6页Chinese Hydraulics & Pneumatics

基　　金：973国家安全重大专项(613128)

摘　　要：以电液流量伺服阀的功率放大级滑阀组件为研究对象,分析污染磨损对组件结构的退化影响,将计算流体动力学(CFD)与冲蚀理论相结合,建立滑阀流体冲蚀的数学模型。通过可视化模拟,分析了污染颗粒对滑阀不同部位的冲蚀磨损分布。结合滑阀的工作原理,分析在不同开度下滑阀内部空腔液体流场的分布特点,研究滑阀开度对冲蚀部位磨损的影响规律。仿真结果表明,滑阀的冲蚀磨损发生在阀套和阀芯的控制边锐缘附近,磨损速率与滑阀开度存在着非线性关系。A simulation model of durability analysis for the electro-hydraulic servo valve is presented.Unlike traditional statistical methods,our work is motivated by the failure mechanism of erosion wear.We focused the influence of contaminant wear on the spool valve,the power amplifier of the electro-hydraulic servo valve.Mathematic models of turbulent and erosion wear for the spool valve are established based on the combined technologies of the computational fluid dynamics and the erosion theory.By the visual simulation,we analyzed the erosion wear distribution of steel particles eroding the spool and the bushing.According to the mission profile of the servo valve,the liquid flow distribution of the internal cavity is simulated under different opening port sizes of the spool valve.Moreover,we investigated the influence of opening port size on erosion wear rate.Finally,the simulation results show that erosion wears of the spool valve occur at the sharp edges of the spool and valve sleeve,and the wear rate of edges relates nonlinearly to the opening size of the port.

关 键 词：滑阀 污染磨损 耐久性仿真 

分 类 号：TH137[机械工程—机械制造及自动化]