HydraulicsPneumatics&Seals/No.3.2024doi:10.3969/j.issn.1008-0813.2024.03.009基于重叠网格的阀芯振荡诱导空化的数值模拟王世强,马兆壮,朱斌权,张旭，闵同为，郑直（兰州理工大学能源与动力工程学院,甘肃兰州730050)摘要：锥阀作为调压阀在工作过程中受到外部激励作用不可避免的会发生轴向振荡，诱导流场中出现空化现象，空化初生、发展及溃灭与阀芯振荡耦合在一起,导致整个液压系统的压力发生大幅波动。针对这一问题,基于OpenFOAM开源平台二次开发出具有动态重叠网格功能的两相空化流求解器，对阀芯振荡诱导空化现象进行数值模拟，结合实验与数值计算结果得出：阀芯振荡关阀阶段阀腔中油液受到惯性作用向出口流动，产生大范围低压区，在低压影响下促使气核剧烈膨胀，在阀腔下游产生二次空化；阀芯振荡开阀阶段阀口处压力梯度大,压差驱动油液高速通过阀口产生射流，导致阀口处形成射流空化，这将为高性能液压阀的设计提供理论依据。关键词：阀芯振荡；空化;重叠网格OpenFOAM中图分类号：TH137(CollegeofEnergyandPowerEngineering,LanzhouUniversityofTechnology,Lanzhou730050,China)Abstract:Asapressureregulatingvalve,thepoppetvalvewillinevitablyoscillateaxiallyundertheexternalexcitationduringtheworkingprocess,inducingcavitationintheflowfield,andtheinitialbirth,developmentandcollapseofcavitationarecoupledwiththeoscillationofthevalvecore,resultinginlargefluctuationsinthepressureoftheentirehydraulicsystem.Inordertosolvethisproblem,basedontheOpenFOAMopensourceplatform,atwo-phasecavitationflowsolverwithdynamicoversetmeshfunctionwasdevelopedforthesecondtime,andthenumericalsimulationofthecavitationinducedbythevalvecoreoscillationwascarriedout,andtheresultsoftheexperimentandnumericalcalculationwerecombined:theoilinthevalvecavityinthevalvecavityinthevalvespooloscillationclosingstagewasinertiatoflowtotheoutlet,resultinginawiderangeoflowpressurearea,whichpromotedtheviolentcollisionofgascoresundertheinfluenceoflowpressure,andproducedsecondarycavitationdownstreamofthevalvecavity;Thepressuregradientatthevalveportinthespoolopeningstageislarge,andthepressuredifferencedrivestheoiltopassthroughthevalveportathighspeedtogenerateajet,resultinginjetcavitationatt...
