外文原文：TheAnalysisofCavitationProblemsintheAxialPistonPumpshuWangEatonCorporation,14615LoneOakRoad,EdenPrairie,MN55344Thispaperdiscussesandanalyzesthecontrolvolumeofapistonboreconstrainedbythevalveplateinaxialpistonpumps.Thevacuumwithinthepistonborecausedbytherisevolumeneedstobecompensatedbytheflow;otherwise,thelowpressuremaycausethecavitationsandaerations.Intheresearch,thevalveplategeometrycanbeoptimizedbysomeanalyticallimitationstopreventthepistonpressurebelowthevaporpressure.Thelimitationsprovidethedesignguideofthetimingsandoverlapareasbetweenvalveplateportsandbarrelkidneystoconsiderthecavitationsandaerations._DOI:10.1115/1.4002058_Keywords:cavitation,optimization,valveplate,pressureundershoots1IntroductionInhydrostaticmachines,cavitationsmeanthatcavitiesorbubblesforminthehydraulicliquidatthelowpressureandcollap---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---seatthehighpressureregion,whichcausesnoise,vibration,andlessefficiency.Cavitationsareundesirableinthepumpsincetheshockwavesformedbycollapsedmaybestrongenoughtodamagecomponents.Thehydraulicfluidwillvaporizewhenitspressurebecomestooloworwhenthetemperatureistoohigh.Inpractice,anumberofapproachesaremostlyusedtodealwiththeproblems:(1)raisetheliquidlevelinthetank,(2)pressurizethetank,(3)boostertheinletpressureofthepump,(4)lowerthepumpingfluidtemperature,and(5)designdeliberatelythepumpitself.Manyresearcheffortshavebeenmadeoncavitationphenomenainhydraulicmachinedesigns.Thecavitationisclassifiedintotwotypesinpistonpumps:trappingphenomenonrelatedone(whichcanbepreventedbytheproperdesignofthevalveplate)andtheoneobservedonthelayersafterthecontractionorenlargementofflowpassages(causedbyrotatinggroupdesigns)inRef.(1).Therelationshipbetweenthecavitationandthemeasuredcylinderpressureisaddressedinthisstudy.EdgeandDarling(2)reportedanexperimentalstudyofthecylinderpressurewithinanaxialpistonpump.Theinclusionoffluidmomentumeffectsan---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---dcavitationswithinthecylinderborearepredictedatbothhighspeedandhighloadconditions.AnotherstudyinRef.(3)providesanoverviewofhydraulicfluidimpactingontheinletconditionandcavitationpotential.Itindicatesthatphysicalproperties(suchasvaporpressure,viscosity,density,andbulkmodulus)arevitaltoproperlyevaluatetheeffectsonlubricationandcavitation.Ahomogeneouscavitationmodelbasedonthethermodynamicpropertiesoftheliquidandsteamisusedtounderstandthebasicphysicalphenomenaofmassflowreductionandwavemotioninfluencesinthehydraulictoolsandinjectionsystems(4).Dularetal.(5,6)developedanexpertsystemformonitoringandcontrolofcavitationsinhydraulicmachinesandinvestigatedthepossibilityofcavitationerosionbyusingthecomputationalfluiddynamics(CFD)tools.Theerosioneffectsofcavitationshavebeenmeasuredandvalidatedbyasimplesinglehydrofoilconfigurationinacavitationtunnel.ItisassumedthatthesevereerosionisoftenduetotherepeatedcollapseofthetravelingvortexgeneratedbyaleadingedgecavityinRef.(7).Then,thecavitationerosionintensitymaybescaledbyasimplesetofflowparameters:theupstreamvelocity,theStrouhalnumber,thecavitylength,andt---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---hepressure.Anewcavitationerosiondevice,calledvortexcavitationgenerator,isintroducedtocomparativelystudyvariouserosionsituations(8).Morepreviousresearchh...