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1、SimulationModellingPracticeandTheory14(2006)1059–1072www.elsevier.com/locate/simpatModellingof?uidpropertiesinhydraulicpositivedisplacementmachinesPaoloCasoli,AndreaVacca*,GermanoFranzoni,GianLuigiBertaDipartimentodiIngegneriaIndustriale,Universita`degliStudidiParma,ParcoAreadelleScienze1
2、81/A,43100Parma,ItalyAvailableonline1November2006AbstractThispaperpresentsanumericalmodelforthesimulationofaswash-plateaxialpistonpump,focusingonthecharac-terizationof?uidproperties.Asitiswellknown,thereductionof?owoscillations(whichgeneratespressureripplesandproducesvibrationandnoiseinth
3、eentirecircuit)andtheavoidanceofcavitationarethemajorproblemsinthedesignofthesepumps.Developingasimulationcodecanbeveryusefulforcomponentoptimisationinordertopredictandreducetheundesiredphenomena.Thepaper?rstgivesaquickoverviewonapreviouslydevelopedpumpmodel;afterwardsfourdi?erentmodelsof
4、the?uidarepresented:theytakeintoaccountcavitationindi?erentways.Theiraimatcharacterizingaswellaspossibletheunsteadyanderraticcavitationfeaturesinasimpli?edmanner,inordertoapplythemodelstothesimulationofhydrauliccomponents.Inthesecondpartofthepaperanapplicationisshownofthesemodelstoanaxial
5、pistonpump:afewresultsarepre-sentedandcomparedwithavailabletestdata.Thee?ectsofthe?uidmodelsonthepredictedpumpperformanceareshownandcommented.ó2006ElsevierB.V.Allrightsreserved.Keywords:Pump;Cavitation;Fluidmodel1.IntroductionAxialpistonpumpsarewidelyusedinmodernhydrauliccircuits,thanksto
6、theirhighspeci?cpower,e?-ciencyandreliability[1].Despitetheseadvantages,pumpoperationisa?ectedbyafewdrawbacks.Infact,inpositivedisplacementmachines,boththepumpingmechanismandthe?uidcompressibilityinduce?owoscil-lations,causingpressurepulsationsandleadingtovibrationsandnoisethroughouttheci
7、rcuit[2,3].Besides,whenthepumpisfedfromatank,the?uidcanbeincontactwithatmosphericairthatpartiallydissolvesintotheliquid.Duringthesuctionstrokethe?uidpressurereductionduetopressurelossesand,inparticular,dynamice?ectscancausetheairtobereleasedinbubbles[4,5].Ifthepress
