正方形射流抑制喷嘴挡板阀空化特性  

Cavitation Reduction of a Flapper-Nozzle Valve Using Square Jets

作　　者：杨贺 周茂瑛 李松晶[2] YANG He;ZHOU Mao-ying;LI Song-jing(School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou,Zhejiang 310018;School of Mechatronics Engineering,Harbin Institute of Technology,Harbin,Heilongjiang 150001)

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018 [2]哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001

出　　处：《液压与气动》2023年第12期141-146,共6页Chinese Hydraulics & Pneumatics

摘　　要：喷嘴挡板伺服阀广泛应用于航空航天、工程机械、深海装备以及机器人等领域的液压伺服系统中。然而,伺服阀内流场的空化特性常常会导致流场压力脉动、高频啸叫以及气蚀损坏等问题,严重影响伺服阀的工作性能。通过采用正方形射流来改变伺服阀前置级流场的流动结构,进而改善伺服阀的空化特性。相比于传统圆形喷嘴情况,当正方形喷嘴边长与阀腔底面平行时,空化现象愈加严重;而当正方形喷嘴边长与阀腔底面成45°夹角时,空化现象得到了明显的改善。The flapper-nozzle servo valves have been widely used in modern hydraulic servo systems of many industrial applications.Flow cavitation in the flapper-nozzle valves could produce pressure fluctuations,noise and cavitation erosion,reducing the performance of the servo valves.The square jets could modify the flow structures in the pilot stage of the flapper-nozzle servo valve,which could further affect the cavitation characteristics.The numerical simulation results show that flow cavitation could be enhanced or suppressed by the square jets.When the edge of the square nozzle is parallel to the chamber bottom,the square jets could deteriorate the flow cavitation.When the edge of the square nozzle and the plane of the chamber bottom are intersected with an angle of 45°,the square jets could reduce the flow cavitation.

关 键 词：喷嘴挡板阀 空化 射流 数值模拟 

分 类 号：TH137[机械工程—机械制造及自动化]