hatbestendeavourswereundertakentoreducethetimetakentoreachtherequiredflowrateduringperformanceandNPSHtests.AcousticEmissionsensorswerelocatedatadistanceof.mfromsuctionflange;atthesuctionflange;onthepumpcasinginthevicinityofimpellersuctioneye;onthecasinginthevicinityoftheimpellerdischargetip;.mfromdischargeflange,seefigure..DataacquisitionsystemsTheAEsensorsusedforalloftheexperimentswerebroadbandtypesensorswitharelativeflatresponseintheregionbetweenKHztoMHz(Model:WD,‘PhysicalAcousticsCorporation’).TheoutputsignalfromtheAEsensorswaspre-amplifiedatdB.ContinuousAEr.m.svalueswerecalculatedinrealtimebytheAnaloguetoDigitalConverter(ADC).ThesamplingrateforacquisitionwassetatmsforalltestsandthetimeconstantforcalculatingtheAEr.m.swasalsosetatms..Experimentalresultsandobservation.PerformancetestFiguredetailstheperformancecharacteristicsofthepump,highlightingtheBEPat.m/hr.Theperformancetestwereundertakentwicetoensurere射,在.m/h流量下所产生声发射最低。