摘要
Asahighspecificspeedpump,thecontra-rotatingaxialflowpumpdistinguishesitselfinarearrotorrotatingintheoppositedirectionofthefrontrotor,whichremarkablycontributestotheenergyconversion,thereductionofthepumpsize,betterhydraulicandcavitationperformances.However,withtworotorsrotatingreversely,thesignificantinteractionbetweenbladerowswasobservedinourprototypecontra-rotatingrotors,whichhighlyaffectedthepumpperformancecomparedwiththeconventionalaxialflowpumps.Consequently,anewtypeofrearrotorwasdesignedbytherotationalspeedoptimizationmethodologywithsomeadditionalconsiderations,aimingatbettercavitationperformance,thereductionofbladerowsinteractionandthesecondaryflowsuppression.Thenewrearrotorshowedasatisfactoryperformanceatthedesignflowratebutanunfavorablepositiveslopeofthehead-flowratecurveinthepartialflowraterangelessthan40%ofthedesignflowrate,whichshouldbeavoidedforthereliabilityofpump-pipesystems.Inthepresentresearch,tounderstandtheinternalflowfieldofnewrearrotoranditsrelationtotheperformancesatthepartialflowrates,thevelocitydistributionsattheinletsandoutletsoftherotorsarefirstlyinvestigated.Then,theboundarylayerflowsonrotorsurfaces,whichclearlyreflectthesecondaryflowinsidetherotors,areanalyzedthroughthelimitingstreamlineobservationsusingthemulti-coloroil-filmmethod.Finally,theunsteadynumericalsimulationsarecarriedouttounderstandthecomplicatedinternalflowstructuresintherotors.
出版日期
2013年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
