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POWDERTECHNOLOGY112200079–86STUDIESONTHEEFFECTOFSWIRLNUMBERSONSTRONGLYSWIRLINGTURBULENTGASPARTICLEFLOWSUSINGAPHASEDOPPLERPARTICLEANEMOMETERLXZHOU,YLI,TCHEN,YXUDEPARTMENTOFENGINEERINGMECHANICS,TSINGHUAUNI˝ERSITY,BEIJING100084,PEOPLE’SREPUBLICOFCHINAABSTRACTTHEEFFECTOFSWIRLNUMBERSONTHEFLOWBEHAVIOROFSTRONGLYSWIRLINGTURBULENTGASPARTICLEFLOWSWITHSWIRLNUMBERSOFSS047,10,15AND21INSUDDENEXPANSIONANDCYCLONECHAMBERSISSTUDIEDUSINGA2DANDA3DPHASEDOPPLERPARTICLEANEMOMETERSPDPATHEAXIALANDTANGENTIALTIMEAVERAGEDANDTHEROOTMEANSQUARERMSFLUCTUATIONVELOCITIESOFGASANDPARTICLEPHASESANDPARTICLECONCENTRATIONAREMEASUREDTHERESULTSHOWSTHATTHESWIRLNUMBERHASANOBVIOUSEFFECTONTHEAXIALVELOCITYPROFILES,THERANKINEVORTEXSTRUCTUREOFTANGENTIALVELOCITYPROFILES,THERELATIONSHIPBETWEENTWOPHASEVELOCITIES,THETURBULENCEINTENSITYLEVELANDTHEANISOTROPYOFTURBULENCEKEYWORDSGASPARTICLEFLOWS;STRONGLYSWIRLINGFLOWS;PDPAMEASUREMENT1INTRODUCTIONSWIRLINGGASPARTICLEFLOWSAREENCOUNTEREDINCYCLONESEPARATORS,CYCLONECOMBUSTORS,HYDROCYCLONESANDSWIRLWXBURNERRCOMBUSTORS1,2HOWEVER,MOSTOFTHEPRESENTWXSTUDIESARELIMITEDTOASINGLEGASPHASEFLOWFIELD3–5WXYUUETAL3STUDIEDTHEGASFLOWFIELDINACYCLONESEPARATORUSINGPROBEANDHOTWIRESYSTEMS,ANDTHERESULTSSHOWAREDUCTIONOFGASAXIALANDTANGENTIALVELOCITIESINTHEPRESENCEOFPARTICLESTHEPROBEMEASUREMENTSMADEWXBYSILVAANDNEBRA4GIVESIMILARRESULTSTHESTUDIESBYWXOGAWAETAL5DEMONSTRATEDTHATTHEREWASNODISTINCTDIFFERENCEBETWEENTHEDUSTLADENGASFLOWANDTHEPUREAIRFLOWINACYCLONECHAMBEROBVIOUSLY,PROBEMEASUREMENTSCANNOTGIVEGASPARTICLETWOPHASEFLOWFIELDSTUDIESUSINGCONVENTIONALANDMODIFIEDLASERDOPPLERVEWXLOCIMETERLDV2,6SHOWSIMILARBEHAVIOROFGASANDPARTICLEFLOWFIELDSEG,RANKINEVORTEXSTRUCTURESOFTANGENTIALVELOCITYPROFILESANDSLIPVELOCITYBETWEENGASANDPARTICLEPHASESINSWIRLINGFLOWSHOWEVER,EVENTHEMODIFIEDLDVMEASUREMENTSCANNOTGIVERELIABLERESULTS,BECAUSEITISUNABLETOIDENTIFYPARTICLESIZESANDTHEEFFECTOFPARTICLESIZEISINCLUDEDINTHEPARTICLE‘‘TURBULENT’’FLUCTUATIONTHEPHASEDOPPLERPARTICLEANEMOMETERCORRESPONDINGAUTHORTELQ861062782231;FAXQ861062785569EMAILADDRESSZHOULXMAILTSINGHUAEDUCNLXZHOUPDPAMEASUREMENTSALLOWOBTAININGTHEDETAILEDINFORMATIONOFPARTICLEVELOCITY,SIZEANDCONCENTRATIONTHEPDPAWASFIRSTUSEDTOSTUDYSUDDENEXPANSIONSWIRLINGGASPARTICLEFLOWWITHSWIRLINGNUMBERSS047BYSOMWXMERFELDANDQIU7THEIRRESULTSDEMONSTRATETHEDIFFERENTBEHAVIOROFPARTICLESOFDIFFERENTSIZESINSWIRLINGFLOWSHOWEVER,NOPDPAMEASUREMENTSOFSTRONGLYSWIRLINGGASPARTICLEFLOWSAREREPORTEDINTHISPAPER,THEPDPASYSTEMISUSEDTOSTUDYSTRONGLYSWIRLINGGASPARTICLEFLOWSINSUDDENEXPANSIONANDCYCLONECHAMBERSWITHTANGENTIALINLETSTHESWIRLNUMBERSWEREVARIEDFROM10TO15AND21THERESULTSARECOMPAREDWITHTHOSEFORTHECASEOFSS047ANDANALYZEDTHEPURPOSEOFTHISSTUDYISTOCLARIFYTHEEFFECTOFSWIRLNUMBERSONTHEBEHAVIOROFSWIRLINGGASPARTICLEFLOWS2EXPERIMENTALSETUPANDMEASUREMENTMETHODSTHEEXPERIMENTALSETUPISSHOWNINFIG1AANDBITCONSISTSOFATESTSECTION,AFEEDINGSYSTEMANDAPDPASYSTEMTHETESTSECTIONISAPLEXIGLASSCHAMBERFIG1BWITHONEAXIALINLETF60MMPLUSTWOSYMMETRICRECTANGULARTANGENTIALINLETS6832MMTHECHAMBERISATUBEOF812MMLENGTHANDANINNERDIAMETEROF120MMONONESIDE,ASLOTISOPENEDANDAPIECEOFOPTICALGLASSISMOUNTEDTHEEXITTUBEISACYLINDEROF1500MMLXZHOUETALRPOWDERTECHNOLOGY112200079–8680FIG1A1DATAPROCESSOR;2SIGNALPROCESSOR;3CONVERTER;4TRANSFORMER;5POWERSUPPLY;6WATERPURIFIER;7LASER;8LASERCONTROLLER;9SPLITTINGGROUP;10EMITTERUNIT;11RECEIVER;12TESTSECTION;13FLOWSTABILIZER;14CYCLONESEPARATOR;15POWDERFEEDER;16FLOWMETER;17VALVE;18AND19COMPRESSORBEXPERIMENTALSETUPLENGTHAND96MMDIAMETER,TOWHICHALARGERSUDDENEXPANSIONCHAMBERISCONNECTEDFORPROTECTINGTHETESTSECTIONFROMTHEDISTURBANCEOFDOWNSTREAMFLOWSACYCLONESEPARATORISUSEDTOCOLLECTTHEPARTICLESTWOBLOWERSWITHVARIABLEFLOWRATESSUPPLYTHEAXIALANDTANGENTIALFLOWSVIATHEVALVES,WHEREBYTHEFLOWRATEMAYBEADJUSTEDTHEFLOWRATESWEREMEASUREDBYTHREESEPARATEFLOWMETERSSPHERICALGLASSBEADSOFSIZESRANGINGFROM0TO150MMWEREUSEDINMEASUREMENTSTHEPARTICLESIZEDISTRIBUTIONISSHOWNINFIG2PARTICLESBELOW10MMWERETAKENASTHEGASTRACERTHISAVOIDEDMISMATCHEDREFRACTIVEINDICESBETWEENSEEDINGANDDISPERSEDPHASEPARTICLESANDALSOELIMINATEDINTERFERENCEBETWEENPARTICLESTHEWIDESIZEDISTRIBUTIONALLOWSOBTAININGTHEDIFFERENTBEHAVIOROFPARFIG2PARTICLESIZEDISTRIBUTIONFIG3PDPAINSTRUMENTATION1,LASER;2,SPLITTER;3AND4,LENS;5,MEASURINGVOLUME;6,RECEIVER;7,FILTER;8,DETECTORTICLESWITHDIFFERENTSIZESPARTICLESAREINTRODUCEDFROMTHEAXIALINLETUSINGASCREWFEEDERA3DPDPA,MADEBYDANTECINC,ANDA2DPDPAMADEBYAEROMETRICS,WEREUSEDTOMEASURESUDDENEXPANSIONGASPARTICLEFLOWSASFORTHEMEASUREMENTTECHNIQUE,THE3DPDPAWITHABACKWARDSCATTERINGARRANGEMENTISSHOWNINFIG3ITISAWELLKNOWNANDWIDELYUSEDTECHNIQUETHEPARTICLEVELOCITYISMEASUREDBASEDONTHEDOPPLERFREQUENCYSHIFTTHEPARTICLESIZEANDCONCENTRATIONAREMEASUREDBASEDONTHEPHASEDIFFERENCECAUSEDBYMIESCATTERINGANDTHENUMBEROFPARTICLESPASSINGTHEMEASURINGVOLUMEDURINGACERTAINTIMEINTERVALTHEPARAMETERSOFTHEOPTICALSYSTEMARESHOWNINTABLES1AND2THEMEASUREMENTSWEREPERFORMEDATFIVECROSSSECTIONSINTHECHAMBER,ANDFOREACHSECTION,THEREAREABOUT25–35MEASURINGLOCATIONSALONGTHEDIAMETERINTHESINGLEPHASEFLOWMEASUREMENT,MORETHAN1000SAMPLESWERETAKENATEACHMEASURINGLOCATION,WHILE2000–5000SAMPLESWERETAKENFORTWOPHASEFLOWMEASUREMENTTHEINLETFLOWCONDITIONSAREGIVENINTABLES3–5THESWIRLNUMBERISDEFINEDASD3R222RWURDRH0SS,D3R22DRURDRH40WHEREDISTHEINLETDIAMETERANDDISTHECHAMBER34DIAMETERDURINGTHEEXPERIMENTS,THETANGENTIALINLETFLOWVELOCITYWASCONSTANT,ANDTHEAXIALINLETFLOWVELOCITYWASTABLE1TRANSMITTINGOPTICSUUUXYZWAVELENGTHOFTHELASERMM514488476FREQUENCYSHIFTMHZ404040BEAMSEPARATIONMM747474DIAMETEROFMEASURINGVOLUMEMM135135135FOCALLENGTHOFTHELASERMM500500500FRINGESEPARATIONMM35331323FRINGENUMBER363636LXZHOUETALRPOWDERTECHNOLOGY112200079–8681TABLE2RECEIVINGOPTICSTHEMAXIMUMDETECTEDDIAMETER26024MM53THEMAXIMUMDETECTEDCONCENTRATION210RCMOFFAXIALANGLE1478FOCALLENGTHOFRECEIVINGLENGTH600MMTHEVALUABLESIGNLEVELY6DBTHEMAXIMUMPHASEERROR258THEMAXIMUMSPHERICALERROR15INCREASEDFROM0CASE1TO12MRSCASE3,ANDINTURN,DECREASEDTHESWIRLNUMBERFROM21DOWNTO103EXPERIMENTALRESULTSANDDISCUSSIONFIGS4–12SHOWTHEMEASUREMENTRESULTSFORCYCLONICGASPARTICLEFLOWSWITHSS21CASE1THECOMPARISONBETWEENTHEPARTICLELADENGASANDTHEPUREGASFLOWFIELDISGIVENINFIGS4–7FIGS4AND5SHOWTHEGENERALBEHAVIOROFCYCLONICTWOPHASEFLOWFIELDWSHAPEDAXIALVELOCITYPROFILESWITHANANNULARREVERSEFLOWZONEANDRANKINEVORTEXTANGENTIALVELOCITYPROFILESOFTWOPHASESITCANBESEENTHATTHEPRESENCEOFPARTICLESREDUCESTHEGASTANGENTIALVELOCITYEVERYWHERETHEGASAXIALVELOCITYDECREASESINTHENEARWALLZONE,BUTINCREASESINTHENEARAXISZONETHEMEASUREDFLUCTUATIONVELOCITIESFIGS6AND7SHOWTHECENTRALPEAKANDTHEINCREASEDVALUENEARTHEWALL,BECAUSEOFTHELARGEVELOCITYGRADIENTINTHESOLIDBODYROTATIONREGIONANDTHEREGIONNEARTHEWALLTHECOMPARISONBETWEENTHESETWOFIGURESSHOWSTHATTHEAXIALFLUCTUATIONVELOCITIESAREMUCHSMALLERTHANTHETANGENTIALONES,DEMONSTRATINGTHEHIGHANISOTROPYOFTURBULENTFLUCTUATIONSMOREOVER,THESEFIGURESINDICATETHATTHEPRESENCEOFPARTICLESREDUCESGASROOTMEANSQUARERMSTANGENTIALFLUCTUATIONVELOCITYALMOSTEVERYWHEREANDAXIALFLUCTUATIONVELOCITYINMOSTREGIONSBUTINCREASESTHELATTERONEINREVERSEFLOWZONESFORPARTICLECONCENTRATION,ALARGEAMOUNTOFPARTICLESALMOSTCONCENTRATESINTHENEARWALLREGIONFIG12DUETOTHESTRONGCENTRIFUGALFORCEFIGS8–11GIVETHECOMPARISONBETWEENTHETWOPHASETANGENTIAL,AXIALVELOCITIESTOGETHERWITHTHERMSFLUCTUATIONVELOCITIESFORTWOPARTICLESIZES60AND100MMTABLE3INLETFLOWCONDITIONCASE1AXIALINLETVELOCITY0MRSTANGENTIALINLETVELOCITY10MRSSWIRLNUMBER21PARTICLEMEANDIAMETER763MM3PARTICLEMATERIALDENSITY2400KGRMPARTICLEMASSLOADING001KGSOLIDRKGGASTABLE4INLETFLOWCONDITIONCASE2AXIALINLETVELOCITY5MRSTANGENTIALINLETVELOCITY10MRSSWIRLNUMBER15PARTICLEMASSLOADING001KGSOLIDRKGGASFIGS8AND9SHOWTHATTHEPARTICLETANGENTIALVELOCITYLAGSBEHINDTHEGASTANGENTIALVELOCITYALMOSTEVERYWHEREWITHTHELARGERPARTICLESHAVINGLOWERVELOCITIESDUETOTHEIRHIGHERINERTIATHEPARTICLEAXIALVELOCITYLAGSBEHINDTHEGASAXIALVELOCITYONLYINTHENEARWALLREGIONITCANBESEENFROMFIGS10AND11THATTHEPARTICLETURBULENTFLUCTUATIONISLOWERTHANTHEGASFLUCTUATIONINMOSTREGIONSBOTHINAXIALANDTANGENTIALDIRECTIONS,ANDTHELARGERTHEPARTICLESIZE,THESMALLERTHEPARTICLEFLUCTUATIONFIGS13,15–18GIVETHEMEASUREMENTRESULTSFORTHESUDDENEXPANSIONFLOWSWITHSS15CASE2ASCANBESEENFROMFIG13,INTHISCASETHEAXIALVELOCITIESOFTWOPHASESHAVENOWSHAPEDDISTRIBUTIONSASTHATFORTHECASESOFSS21FIG4AND047FIG14,BUTAREHIGHERNEARTHEAXISANDLOWERWITHASMALLPEAKNEARTHEWALLTHEPARTICLEAXIALVELOCITYLAGSBEHINDTHEGASONEINMOSTREGIONS,ANDTHEVELOCITYSLIPBETWEENTWOPHASESINCREASESWITHTHEINCREASEINPARTICLESIZE,BUTTHERELATIVESLIPISNOTVERYLARGEINTHENEARWALLREGION,THEPARTICLEAXIALVELOCITYISSLIGHTLYLARGERTHANTHEGASVELOCITYTHEPARTICLETANGENTIALVELOCITYLAGSBEHINDTHEGASTANGENTIALVELOCITYFIG15,ANDTHELARGERTHEPARTICLESIZE,THEMORETHELAGINTHEFIRSTANDSECONDSECTIONS,THESTRUCTUREOFRIGIDBODYROTATIONINTANGENTIALVELOCITYPROFILESISNOTOBVIOUSBECAUSEOFTHEINJECTIONOFAXIALNONSWIRLINGFLOWSINTHESUBSEQUENTSECTIONS,DUETOTHEINCREASINGEFFECTOFCENTRIFUGALFORCE,THETANGENTIALVELOCITYDISTRIBUTIONOFTWOPHASESSHOWSANOBVIOUSRANKINEVORTEXSTRUCTUREWITHTHEGRADUALLYVANISHINGEFFECTOFINLETCONDITIONSFIG16GIVESTHEPARTICLEANDTHEGASAXIALFLUCTUATIONVELOCITIESWITHHIGHERVALUESNEARTHEWALLANDLOWERVALUESNEARTHEAXISUNLIKETHATINCASE1,THEREISNOPEAKVALUENEARTHEAXISINTHISCASETHEPARTICLEAXIALFLUCTUATIONVELOCITYISSMALLERTHANTHATOFTHEGASPHASE,ANDDECREASESWITHTHEINCREASEOFPARTICLESIZETHESERESULTSARESIMILARTOTHOSEFORCASE1FIG17INDICATESTHATTHEPARTICLETANGENTIALFLUCTUATIONVELOCITYISSMALLERTHANTHATOFTHEGASPHASEINMOSTREGIONSTHISISSIMILARTOTHATFORCASE1ANDTHOSEWXREPORTEDPREVIOUSLY2,6,7BOTHFORWEAKLYANDSTRONGLYSWIRLINGGASPARTICLEFLOWSTABLE5INLETFLOWCONDITIONCASE3AXIALINLETVELOCITY12MRSTANGENTIALINLETVELOCITY10MRSSWIRLNUMBER10PARTICLEMASSLOADING001KGSOLIDRKGGASLXZHOUETALRPOWDERTECHNOLOGY112200079–8682FIG4GASTANGENTIALMEANVELOCITIESMRSCASE1FIG5GASAXIALMEANVELOCITIESMRSCASE1FIG6GASTANGENTIALFLUCTUATIONVELOCITIESMRSCASE1FIG7GASAXIALFLUCTUATIONVELOCITIESMRSCASE1FIG8TWOPHASETANGENTIALTIMEAVERAGEDVELOCITIESMRSCASE1FIG9TWOPHASEAXIALTIMEAVERAGEDVELOCITIESMRSCASE1FIG10TWOPHASETANGENTIALFLUCTUATIONVELOCITIESFIG11TWOPHASEAXIALFLUCTUATIONVELOCITIESMRSCASE1
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本文标题:外文翻译--利用相位多普勒粒子风速仪研究漩涡号码对强旋湍流气固两相流的影响 英文版.pdf
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