液压与气动2025，Vol.49Issue(2)：36-49,14.DOI:10.11832/j.issn.1000-4858.2025.02.005
先导方式对比例阀振荡特性的影响机理
Influence Mechanism of Pilot Mode on the Oscillation Characteristics of Proportional Valve
摘要
Abstract
Different pilot control strategies for proportional valves induce varying extents of cavitation and vortex phenomena within the main valve control cavity,culminating in distinct oscillatory behaviors of the main spool.This study integrates CFD flow field simulations with visualization experiments to explore the flow characteristics of the control cavity when employing either a high-speed on-off valve bridge or a proportional pressure-reducing valve as the pilot stage.The influence mechanism of the pilot approach on main valve oscillations is elucidated by analyzing the flow field characteristics and vortex structures.A method to optimize the control cavity flow field is proposed,namely,chamfering the geometric corners and improving the wall smoothness.The results reveal that vortex generation and dissipation within the control cavity are intimately linked to spool oscillations.When the high-speed on-off valve bridge is utilized as the pilot,the flow field demonstrates significant fluctuations,intricate vortex structures,and periodic vortex variations,all contributing to pronounced main valve oscillations.Conversely,employing the proportional pressure-reducing valve as the pilot yields a more stable flow field,with uniform pressure distribution and simple vortices confined to geometric corners,where the interplay between pressure differentials and flow velocity further mitigates spool oscillations.This study offers a theoretical foundation for optimizing control cavity design and mitigating oscillations.关键词
比例阀/动网格/流场特性/振荡特性/可视化试验Key words
proportional valve/dynamic grid/flow field characteristics/oscillation characteristics/visualization experiments分类
机械工程引用本文复制引用
李娜娜,何小康,魏列江,万思毅,张海东,董成龙..先导方式对比例阀振荡特性的影响机理[J].液压与气动,2025,49(2):36-49,14.基金项目
国家自然科学基金(51905243) （51905243）
国家重点研发计划(2022YFB3403003) （2022YFB3403003）
