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1、SimulationModellingPracticeandTheory14(2006)1059–1072www.elsevier.com/locate/simpatModellingoffluidpropertiesinhydraulicpositivedisplacementmachinesPaoloCasoli,AndreaVacca*,GermanoFranzoni,GianLuigiBertaDipartimentodiIngegneriaIndustriale,Universita`degliStudidiParma,ParcoAreadelleScienze1
2、81/A,43100Parma,ItalyAvailableonline1November2006AbstractThispaperpresentsanumericalmodelforthesimulationofaswash-plateaxialpistonpump,focusingonthecharac-terizationoffluidproperties.Asitiswellknown,thereductionofflowoscillations(whichgeneratespressureripplesandproducesvibrationandnoiseinth
3、eentirecircuit)andtheavoidanceofcavitationarethemajorproblemsinthedesignofthesepumps.Developingasimulationcodecanbeveryusefulforcomponentoptimisationinordertopredictandreducetheundesiredphenomena.Thepaperfirstgivesaquickoverviewonapreviouslydevelopedpumpmodel;afterwardsfourdifferentmodelsof
4、thefluidarepresented:theytakeintoaccountcavitationindifferentways.Theiraimatcharacterizingaswellaspossibletheunsteadyanderraticcavitationfeaturesinasimplifiedmanner,inordertoapplythemodelstothesimulationofhydrauliccomponents.Inthesecondpartofthepaperanapplicationisshownofthesemodelstoanaxial
5、pistonpump:afewresultsarepre-sentedandcomparedwithavailabletestdata.Theeffectsofthefluidmodelsonthepredictedpumpperformanceareshownandcommented.Ó2006ElsevierB.V.Allrightsreserved.Keywords:Pump;Cavitation;Fluidmodel1.IntroductionAxialpistonpumpsarewidelyusedinmodernhydrauliccircuits,thanksto
6、theirhighspecificpower,effi-ciencyandreliability[1].Despitetheseadvantages,pumpoperationisaffectedbyafewdrawbacks.Infact,inpositivedisplacementmachines,boththepumpingmechanismandthefluidcompressibilityinduceflowoscil-lations,causingpressurepulsationsandleadingtovibrationsandnoisethroughouttheci
7、rcuit[2,3].Besides,whenthepumpisfedfromatank,thefluidcanbeincontactwithatmosphericairthatpartiallydissolvesintotheliquid.Duringthesuctionstrokethefluidpressurereductionduetopressurelossesand,inparticular,dynamiceffectscancausetheairtobereleasedinbubbles[4,5].Ifthepress
