简介：AnexperimentalapparatustoinvestigateACMHDpumpwasestablished,whichmainlyconsistsofarotarypermanentmagnetwith4polesanannularchannel,amotor,ashaftandaplatform.Themagnetgeneratesafieldsimilartosinusoidwiththemaximumof0.9TinthechannelwhenitisrotatedupbythemotortosimulateanACmagneticfield.Thismovingmagneticfieldactsontheconductivefluidinthechannel,andproducesanelectromagneticforcetomovethefluidinthesamedirectionasthatofthemagnetrotating.Experimentswerecarriedouttoinvestigatetheperformanceofthepump.Flowvelocityintheannularchannelwasmeasuredfordifferentconductivitiesandrotatingspeedsofthemagnet.Theresultsshowthattheflowrateandpressureincreaseasthemagneticfieldstrength,fluidconductivityandfrequencyofthemagneticfieldincrease.
简介：Inthispaper,perturbationmethodandFourier-cosine-expansionmethodareusedtosolvea3-DnonlinearproblemofasupercavitatingflowinaninclinedfieldofgravityatlargeFroudenumbers.Byexpandingthevelocitypotentialintoapowerseriesofasmallparameter,theoriginal3-Dnonlinearproblemisreducedtoanumberof2-Dones.Thesolutionsofthefirstthreeordersarederivedindetailandexpressedintermsofthecompleteellipticintegralsofthefirstandsecondkinds.Thentheboundaryintegralequationmethodisappliedtogetthenumericalsolutionsforeachorder.Computationalresultsareprovidedforsupercavitatingflowspastconesundervariousflowconditions.
简介：Aerationisanimportantfactoraffectingthebiologicalaerationfilter.Withasetofexperimentdevicespeciallydesignedforthepurpose,andtheparticleimagevelocimetrytechnique,thevelocityfieldofthegas-liquidtwo-phaseflowisstudiedunderdifferentconditions.Thevarioussimulatedaerationstateswereactuallyappliedtotheexperimentaldeviceofsewagetreatment,andtheresultsofthenumericalsimulationwereverified.Thefinalexperimentalresultsindicatethatthemostefficientstateoccurswhentheratioofwaterinaerationtankh/w=1,thediameterofcapillarytubesd=0.6mmandthevelocityofbubblesv=0.3m/s.
简介：Inthispaper,recentmeasurementsoftipvortexflowwithandwithoutcavitationcarriedoutinCavitationMechanismTunnelofChinaShipScientificResearchCenter(CSSRC)arepresented.TheelliptichydrofoilwithsectionNACA662-415wasadoptedastestmodel.High-speedvideo(HSV)camerawasusedtovisualizethetrajectoryoftipvortexcoreandtheformoftipvortexcavitation(TVC)indifferentcavitationsituations.LaserDopplervelocimetry(LDV)wasemployedtomeasurethetipvortexflowfieldinsometypicalsectionsalongthevortextrajectorywiththecaseofcavitationfree.Stereoparticleimagevelocimetry(SPIV)systemwasusedtomeasurethevelocityandvorticitydistributionswithandwithoutcavitation.Seriesmeasurementresultssuchasvelocityandvorticitydistributions,thetrajectoryoftipvortexcore,thevortexcoreradius,cavitysizeandcavitationinceptionnumberwereobtained.Theresultsdemonstratedthattheminimumpressurecoefficientinthevortexcoreobtainedbyflowfieldmeasurementwasquitecoincidentwiththetipvortexcavitationinceptionnumberobtainedundertheconditionofhighincomingvelocityandlowaircontent.AndTVCwoulddecreasethevortexstrengthcomparingwiththecasewithoutcavitation.
简介：Asanewjettechnologydevelopedinrecentyears,thesupercriticalcarbondioxide(SC-CO2)jettechnologyenjoysmanyadvantageswhenappliedinoilandgasexplorations.InordertostudythepropertiesandparametricinfluencesoftheSC-CO2jet,theflowfieldsoftheSC-CO2jetaresimulatedusingthecomputationalfluiddynamicsmethod.TheflowfieldoftheSC-CO2iscomparedwiththatofthewaterjet.TheinfluencesofseveralparametersontheflowfieldoftheSC-CO2jetarestudied.Itisindicatedthatlikethewaterjet,thevelocityandthepressureoftheSC-CO2jetcouldbeconvertedtoeachother,andtheSC-CO2jetcangenerateasignificantimpactpressureonthewall,theSC-CO2jethasastrongerimpactpressureandahighervelocitythanthoseofthewaterjetunderthesameconditions,themaximumvelocityandtheimpactpressureoftheSC-CO2jetincreasewiththeincreaseofthenozzlepressuredrop,underthestimulationconditionofthisstudy,theinfluenceoftheSC-CO2temperatureontheimpactpressurecanbeneglectedinengineeringapplications,whilethemaximumvelocityoftheSC-CO2jetincreaseswiththeincreaseofthefluidtemperature.ThispapertheoreticallyexploresthepropertiesoftheSC-CO2jetflowfield,andtheresultsmightprovideatheoreticalbasisfortheapplicationoftheSC-CO2jetinoilandgaswelldrillingsandfracturingstimulations.
简介：Undertheeffectsofelectricfieldandchemicalreaction,theproblemofdispersionofaerosolsinapoorlyconductingfluidinachannelissolvedanalyticallyusingthemixturetheorytogetherwitharegularperturbationtechnique.Itisshownthattheaerosolsaredispersedrelativetoaplanemovingwiththemeanspeedofatmosphericfluidaswellasthemeanspeedofagglomerationofaerosolwitharelativediffusioncoefficient,calledtheTaylordispersioncoefficient.Thiscoefficientisnumericallycomputedandtheresultsrevealthatitincreaseswithanincreaseintheelectricnumber,butdecreaseswithincreasingporousparameter.Thephysicalexplanationsforthephenomenaaregiveninthisarticle.
简介：Axisymmetricliquidjetshavebeenstudiedextensivelyformorethanonecentury,whilenon-axisymmetricjetsarealsoverycommoninengineeringapplicationsbutattractlessconcern.BasedonEulerianfluid-fluidmodelinFluentsoftware,thisarticleanalysizesthe3-DflowfieldsofpressureatomizerswithV-shapedcutatorifice,whichwillresultinanon-axisymmetricliquidjet.Flowrateanalysisandjetstructureanalysisarecarriedout,theresultsshowthattheflowratecanbeformulatedbyaddingacorrectioncoefficienttotheformulaofinviscidaxisymmetricjetsinatomizationregime,whentheWebernumberislowenoughtomaketheflowfalloutofatomizationregime,andthejetstructuretogetherwiththeflowrateformulawillchange.Analysisshowsthattheevolutionofthesprayandthereforethestructureoftheliquidjetareaffectedmuchbyrelativevelocityandthelocalvolumefractionofliquidphase.
简介：Inthisarticle,thelowpressureaxialflowfanwithcircumferentialskewedrotorblade,includingtheradialblade,theforward-skewedbladeandthebackward-skewedblade,wasstudiedwithexperimentalmethods.Theaerodynamicperformanceoftherotorswasmeasured.Atthedesignconditionatoutletoftherotors,detailedflowmeasurementswereperformedwithafive-holeprobeandaHot-WireAnemometer(HWA).Theresultsshowthatcomparedtotheradialrotor,theforward-skewedrotordemonstratesawiderStableOperatingRange(SOR),isabletoreducethetotalpressurelossinthehubregionandmakemainloadingofbladeaccumulatinginthemid-spanregion.Thereisawiderwakeintheuppermid-spanregionoftheforward-skewedrotor.Comparedtotheradialrotor,inthebackward-skewedrotorthereishighertotalpressurelossnearthehubandshroudregionsandlowerlossinthemid-spanregion.Inaddition,thevelocitydeficitinthewakeisloweratmid-spanofthebackward-skewedrotorthantheforward-skewedrotor.
简介：Thepurposeofthispaperistofindsomebettermethodsforcalculatingin-lineforcesonaverticalcircularcylinderandforanalysingthehydrodynamiccoefficientsC_DandC_Minwave-currentco-existingfield.Inthispa-per,inordertocalculatehydrodynamicforces,theauthorstrytofindawayofapplyingagreatnumberofthere-sultsaboutC_DandC_Mforwave-onlyfieldinthecaseofwave-currentco-existingfield,andtheresultsaboutC_DandC_Mobtainedinregularwavesintheeaseofirregularwaves.Suchawaymaybeofsignificanceinengineeringandfurtherresearch.
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