外文翻译节流阀操作状态在流量特性之上的有效实验研究

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1、OFOPERATINGConditionsONTHEFLOWCHARACTERISTICSOExperimentalSTUDYOFEFFECTSERHYDRAULICTHROTTLEAbstract：Experimentalinvestigationsaremadeontheeffectsofoperatingconditionsontheflowcharacteristicsofthrottlewhentapwaterisusedastheworkingmedia．Theresearchedthrottlesincludeconepoppetvalve．ballvalve

2、．discvalveanddumpingorifice．Operatingconditionincludespoppetlift，workingmedia，backpressure，mediumtemperature，etc．Becausethevaporouspressureofwaterismuchhigherthanthatofoil．capitationiseasiertooccurinwaterhydraulicelementsandsystems，sotheeffectsofoperatingconditionsonthecapitationcharacteri

3、sticsofthrottlearealsoresearched．Keywords：WaterhydraulicsFlowcharacteristicsHydraulicthrottleOperatingconditionCapitationOIntroductionWaterhydraulicsisatechnologyusingfreshwaterorsea—waterinsteadofminera1oi1asthepressuremediainhydraulicpowersystems，whichhasbecomemoreandmoreattractiveowingt

4、othegreatadvantagessuchasenvironmenta1friendliness．noflammability,cheapness，cleanlinessandeasydisposal.However,comparedwithminera1oi1asakindofworkingmedia．waterhaslowerviscosity，highervaporouspressure，higherdensityand1argerbulkmodulus，etc．Becauseofthese，theflowCharacteristicsusingwateraswo

5、rkingmediaareverydifferentfromthecasewhenusingoilasworkingmedia．Generally,therearetwokindsoffactorsexecutinggreateffectsontheflow—pressurecharacteristicsofthrottle．oneisgeo．metricshapeandparameters．Whichincludetheshapeofpoppetandseat，coneangle，thelengthoforifice，thelapbetweenpoppetandseat，

6、etc，andareunchangeablewhenthethrottleismanufactured．ManyresearcherspaidtheirmuchattentiontotheeffectsofgeometricshapeontheflowcharacteristicsofthrottleLJ．Theotherisoperatingconditions，whicharechangedwithvariousworkingcase．OperatingconditionsincludepoppetLift，workingmedia，backpressureandmed

7、iumtemperature，etc．Comparedwiththeresearchesofeffectsofgeometricshapeonflowcharacteristics，previousresearchesareseldomconcentratedontheeffectsofoperatingconditionontheflowcharacteristicsofthrottle，especiallyusingwaterasworkingmedia．In1991．D．N．Johnstonandcowork