摘要
为揭示高压隔膜泵单向阀开合过程中流场与阀芯运动耦合机理,基于6DOF模型和动网格算法,构建单向阀流场与阀芯运动的耦合仿真模型。通过数值模拟,对单向阀的流场速度、压力分布及脉动特性进行分析,获得流场域随时间演变的速度和压力云图、全开度下的流场分布以及压力脉动时频域信息,并探讨弹簧参数及流体性质对阀芯运动的影响规律。结果表明:在单向阀一个开合周期内,位于阀隙流场处的流体流速激增,高速流体与腔内低速流体相接触形成剪切流动,在阀芯的周围流场形成大尺度漩涡特征;阀芯两侧流场存在较大压差,入口侧形成高压区,阀隙流场处呈现大幅度压力梯度变化且振幅波动显著,压力脉冲峰值频率集中在低频段内;随着弹簧刚度及预紧力增大,阀芯升程高度减小,回座撞击作用加剧,且预紧力对阀芯振荡影响较为显著;随着入口流量增大,阀芯升程高度增大,上升及回座速度增大,振荡幅度增大。
Here,to reveal coupling mechanism between flow field and valve disc movement in opening and closing process of high-pressure diaphragm pump check valve,a coupling simulation model of flow field and valve disc movement of check valve was constructed based on a 6 DOF model and dynamic grid algorithm.By numerical simulation,flow field velocity,pressure distribution and pulsation characteristics of check valve were analyzed,and time-varying velocity and pressure cloud maps of flow field domain,flow field distribution under full opening and time-frequency domain information of pressure pulsation were obtained.Effects of spring parameters and fluid properties on valve disc movement were also explored.The results showed that during one opening-closing cycle of check valve,fluid velocity at valve gap flow field increases sharply,and high-speed fluid comes into contact with low-speed fluid inside cavity to form shear flow,large-scale vortex characteristics are formed in flow field around valve core;larger pressure difference exists in flow fields at both sides of valve core to form a high-pressure zone at inlet side;valve gap flow field exhibits significant pressure gradient change and amplitude fluctuation,and peak value frequencies of pressure pulses are concentrated in low-frequency range;with increase in spring stiffness and preload,valve core lift height decreases,recoil impact intensifies,and preload affects more significantly valve core oscillation;with increase in inlet flow rate,valve core lift height increases,rising speed and recoil speed increase,and oscillation amplitude increases.
作者
粟立静
马军
曾尧
熊新
丁文浩
SU Lijing;MA Jun;ZENG Yao;XIONG Xin;DING Wenhao(School of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Intelligent Control and Application,Kunming University of Science and Technology,Kunming 650500,China)
出处
《振动与冲击》
北大核心
2025年第3期115-123,共9页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(62163020,62173168)
云南省基础研究计划项目(202401AW070014)
云南省重大科技专项项目(202202AD080005)。
关键词
单向阀
动网格
流速分布
压力脉动
阀芯运动
check valve
dynamic grid
flow velocity distribution
pressure pulsation
valve disc movement
