《Numerical and Experimental Study on Flow-induced Noise at Blade-passing Frequency in Centrifugal Pumps》.pdf

CHINESEJOURNAL0FMECHANICALENGrNEER G Vo1．27，No．3，2014 DOI：10．3901／CJME．2014．03．606，availableonlineatwww．springerlink．com；www．cjmenet．com；www．cjmenet．tom．cn NumericalandExperimentalStudyonFlow--inducedNoiseatBlade-·passing FrequencyinCentrifugalPumps YANGJun，YUANShouqi，YUANJianping，SIQiaorui，andPEIJi ResearchCenterofFluidMachineryEngineeringandTechnology,JiangsuUniversity,Zhenjiang212013，China ReceivedAugust16，2013；revisedFebruary17，2014；acceptedMarch24，2014 Abstract：With the increasingnoisepollution，low noiseoptimization ofcentrifugalpimpshasbecomeahottopic．However。 experimentalstudyonthisproblem isunacceptableforindustrialapplicationsduetoun sustainablecost．A hybridmethodthatcouples computationalfluiddynamics(CFD)withcomputationalaeroacousticsoftwareisusedtopredicttheflow．inducednoiseofpumpsin ordertominimizethenoiseofcentrifugalpumpsinacutalprojects．UnderLangthjem’sassumptionthatthebladesurfacepressureisthe mainflow—inducedacousticsourceincentriufgalpumps．thebladesurfacepressurepulsationisconsideredintermsoftheacoustical sourcesandsimulatedusingCFX sofwt are．Thepressurepulsationandnoisedistributioninthenear-cutoffregionareexaminedofrthe blade—passingrfequency(BPF)noise，andhtesoundpressurelevel(SPL)reachedpeaksnearthecutoffthatcorrespondedwiththe pressurepulsationinthisregion．Anexperimentisperfomr edtovalidatethisprediction．Fourhydrophonesarefixedtotheinletand outletportsofthetestPmu Ptomeasuretheflow—inducednoisefrom thefour-port mode1．Thesimulationresultsofrthenoiseare analyzedandcomparedwiththeexperimentalresults．Thevariationinthecalculatednoisewithchangesintheflow agreedwel1withthe experimentalresults．Whentheflow ratewasincreased．theSPLfirstdecreasedandreachedhteminimum nearhtebeste伍clentpoint rBEP)；itthenincreasedwhentheflowratewasfurtherincreased．Thenumer