射流偏转板劈尖形变对其零位特性的影响  

Effect of wedge deformation of jet deflector on its zero-position feature

作　　者：冀宏[1,2] 张硕文[1,2] 刘新强 李瑞锋[1,2] 李琼[1,2] JI Hong 1,2 , ZHANG Shuo-wen 1,2 , LIU Xin-qiang 1,2 , LI Rui-feng 1,2 , LI Qiong 1,2(1. College of Energy and Power Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;2. Hydraulic and Pneumatic Engineering Technology Research Center of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, Chin)

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

出　　处：《兰州理工大学学报》2018年第3期45-49,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51575254)

摘　　要：采用RNGk-ε湍流模型和气穴模型对射流偏转板伺服阀的前置级三维流场进行了仿真,分析了劈尖微小形变对伺服阀前置级射流气穴强弱、零位压力增益、零位流量增益和泄漏流量的影响.结果表明:劈尖为平顶时气相体积分数最高;随着偏转板位移的增大,前置级气相体积分数呈增大趋势;劈尖为平顶时前置级压差较大、零位压力增益比其他结构分别大21.5%和26.0%;劈尖为尖顶时前置级流量较大,零位流量增益比其他两种结构大19.1%和18.6%;劈尖为尖顶时前置级泄漏流量为7.51mL/s,泄漏流量最小;随着偏转板位移的增大,泄漏流量基本不变.Three-dimensional flow field in prestage of jet deflector servo valve is simulated based on RNG k-εturbulence mode and cavitation model and the effect of slight deformation of the wedge on jet cavitation intensity,zero pressure gain,zero flow rate gain,and leakage flow of the prestage of the servo valve is analyzed.The result shows that when wedge top is flat,the gas volume fraction will be the highest.With increase of displacement of the deflector the gas volume fraction of prestage will tend to increase.When the wedge top is flat,the differential pressure in prestage will be greater and the zero pressure gain will be larger than that in other two prestages with different wedge top structure by 21.5%and 26.0%,respectively.When the wedge top is pointed,the flow rate of the prestage will be larger,the zero flow rate gain will be greater respectively by 19.1% and 18.6%than that of other two,and the leakage flow of prestage will be7.51 mL/s,being the least.With increase of displacement of the deflector the leakage will remain unchanged.

关 键 词：射流偏转板伺服阀 劈尖形变 气穴模型 零位特性 仿真研究 

分 类 号：TH137[机械工程—机械制造及自动化]