ei会议论文格式.docx
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ei会议论文格式.docx
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ei会议论文格式
ei会议论文格式
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ei检索的国际会议论文标准格式】
thestructureoptimizationofthesiphonicbedpan’sflowchannelbasedonthe
numericalsimulationtechnology
gezhenghao,wangjinshui,supenggang,liangjiangbo
shaanxiuniversityofsciencetechnology,xian,shaanxi,710021,china
gezh@
abstract—accordingtosiphonicbedpan’sworkprinciple,siphonicbedpanwithvariationalsectionflowchannelisputforwardsintoapplicationinthispaper.structuredesignoptimizationofsiphonicbedpan’sflowchannelisdiscussed.basedonmakinguseofpro/etoconducttheparametrizationmodelingofthesiphonicbedpan(theconstantsectionbedpanandthevariationalsectionbedpan),andthenadoptadinatosimulatetheflowfieldinthesiphonicbedpanwithnottakingthefilthintoconsideration.thecalculationresultsofthenumericalsimulationdemonstratethatvariationalsectionbedpanisbetterthantheconstantsectionbedpaninflushingandsavingwater.theresultsindicatestheadoptionofadinasoftwaretocarryoutsanitaryimplement’snumericalsimulationcanimprovetheaccuracyofthebedpandesignandmanufacturingconsumedly,providesatheoriesanalysisfoundationfortheengineering,designandapplicationofbedpan.
keywords-siphonicbedpan;flow
channel
structure;
numericalsimulation
i.introduction
thesoftwareadinaistheproductoftheamericancompanyofadina,itisalargenumericcalculationalsystembasedonthefiniteelementmethod.itcomputestheengineeringproblemsthatvariousstructure,fluid,thetemperaturefieldandseveralfieldcouplingbysolvingvariousphysicalbasiccontrollingequation.thispaperrecurstothepro/eandadina,makinguseoftheparameterizationdesignandnumericalsimulation,haveresearchedsiphonicbedpan?
sbeststructureofflowchannel.ii.
flushingfunctionrequirementofsanitary
implement
withtheimprovingofthepeople?
slife,therequesttothesanitaryimplementisbecominghigherandhigher.atthesametime,itisrequestedthat:
(1)fullfilltheessentialfunction,
(2)stresstheshapebeauty,and(3)savingwater.thequalityofthesanitaryimplementhasbeenrequestedtoincludeexactsizetolerance,fineexternalappearance,physicsfunction,flushingfunctionetc.flushingfunctionistheabilitythatthebedpanejectsfilth,washesitclearlywhilecontrollingtheamountofwater.withoutquestion,flushfunctionisoneoftheuppermostfunctions.accordingtotheflushingway,bedpancanbedividedintowash-downtype,siphonictypeandejectingsiphonictype.wash-downbedpanrushoutfilthbytheimpactofthewater,thepowerisdecidedbypotentialenergyofthewaterintanksubtracts
losingenergy.siphonicbedpan?
sflushpowerprimarilyreliesonsiphonicpower.
iii.thestructuredesignofsiphonicbedpan?
s
flowchannelasmentionedabove,undertheconditionofpipingwater-filled,whatevermeansweadopt,itwillnotproducethesiphonicphenomenonifairisinterfused.soweshouldmakesurethatthepipingsectiondimensionisappropriate,asfigure1shows,thediameterofd-esegmentisdegressive.accordingtothestaticsandhydromechanicstheories,whilethefluidinpipingflowsstably,thephysicalvolumefluxisconstantatanysectionofthepipe.sothesmallerofthepipesection,thehigherofthecurrentvelocityofthefluid.sothediameterchangecouldresultinthewater
velocitychangeinthed-esegment.
figure1.thestructuredesignofsiphonicbedpan?
sflowchannel
thusatthebeginningofthesiphonicbedpan?
sflowchannel,theflushingvelocityofthewaterbecominghigherandhigher,formthee-fsegmentinadvance,expeditesiphonicprocess,reducetheamountofwater,attainedthepurposeofsavingwater.thed-esegmentisrising,anditssectiondiameterisgenerallyamong55-65mm.theabilityofrushingoutfilthwillbeweakendwithlargerdiameter,theresultmayincreasewateramount.whilethedrainageamountinforepartwillbeinfluencedwithsmallerdiameter,itwillcausethewatersurfacerising,andresultinsiphonicphenomenonlater.thee-fsegmentisahumpsegment,itsperfectsectiondiametergenerallyamong45-55mm.thef-gsegmentisaincreasingsegment,thediameterisbecomingbiggerfromsmall,andthesectionisbecominglarge,itwilllowersegment?
sthecurrentlengthincrease,velocityofintheadditionfluid,makemakesiphonicsiphonicphenomenonkeepmoretime,anditssectiondiameterisgenerallyamong55-60mm.
iv.three-dimensionalsteadynumeric
simulationforflowinginbedpan
bedpan?
sgeometricalmodelingisthemostcomplicatedinsanitaryimplements,itscadmodelincludecomplicatedsurfaceandcharacteristics,thesemayresultinmanydifficultiesduringthenumericsimulationandinfluencetheresult.consideringthesiphonicbedpan?
swholeflowchannelascomputingarea,andthedifficultytosetupthecadmodelinadina,sothispapermakeuseofpro/etoconducttheparameterizationmodelofthesiphonicbedpan.thewaterwarpis200mmhigh,andthepipediameterinthelargestsectionis80mm.
thenthemodelisimportedintoadina8.3throughigesdataformat.inadina,westillneedtopredigestthephysicsmodelbeforeaddingloadandboundaryconditions.detailedinformationisasfollows:
load:
velocity(thewaterwarp?
sentryvelocityis1.5m/s),
pressure(pressureinpipingexit),andinaddition,
inadina,tetrahedralgridisadopted,andthemodelismeshedaccordingtoappointedunitlengthbeing2mmtothesectionswithsamediameter.totheconstantsectionbedpan,totalmeshinggridnodeamountis3378,meshinggridunitamountis15497,andtothevariationalsectionbedpan,meshinggridnodeamountis2968,meshinggridunitamountis13818.appointedtimestepis100,constantmagnitudeis0.1s,thecalculationresultsareshowedasthe
figure2and3.
figure2.pressuredistributingfortheconstantsectionbedpan
figure3.pressuredistributingforthevariationalsectionbedpan
comparingtheabovetwocalculationresultsandinregardtopressureandvelocity,intheapproximatesame
position,thevariationalsectionbedpanobviouslyexcelledtheconstantsectionbedpan.totheconstantsectionbedpan,themaximalpressureis7.3e+06(pa),theupmostvelocityis42.32m/s,thepipe?
sexitmaximalpressureis-77583pa,tothevariationalsectionbedpan,themaximalpressureis2.178e+08(pa),theupmostvelocityis193.2m/s,thepipe?
sexitbedpan?
smaximalflowpressurechannelisstructure,-227620pa.becauseanalyzingofthesiphonicrisingsegment,humpsegmentanddescendingsegment,risingsegmentdiameterisbecomingsmaller,thusinthebeginningofthed-esegment,thewatervelocitybecomingmoreandmorehigh,filledthehumpsegmentinadvance,siphonicprocesswasoccurredrapidly.somakethesiphonicpressureincreaseconsumedly,andenhancethesiphonicpower,attainedthepurposeofsavingwater.
v.
thevofanalysisonsiphonicbedpan?
s
flushingprocess
a.thevofmethod
thevof(volumeoffluid)methodisdefinedsuchavolumefractionf,definingthevalueofthepointhavingfluidas1,thevalueofthepointhavingnofluidas0.thus,inameshunit,thefaveragevaluerepresentsthequotathatfluidcontainedtheunit.iftheaveragevalueis1,themeshisfilledwiththefluid,iftheaveragevalueis0,thenforemptymesh.ifthevalueisbetween0and1,themeshisfreesurfacemesh.soithasadvantagesofeasyrealization,smallcalculationquantity,high-precisionetc,andcanhandlecomplexnonlinearproblemsuchasfreesurfacefolding,freesurfacefillingwateretc.whenthemodelinvolvesflowtheoriesofthetwophasesormulti-phase,itintroducesthesinglefluidmodeltosolveproblem.namely,inthewater-airtwophaseflowfield,waterandairobeythesameteammomentumequation.inthecomputingarea,eachcontrollingvolumeisfillingwithwaterandair,andtheirvolumefraction?
sadditionshouldbe1,namely,
aw?
aa?
1
amongabove,?
a?
denotesthevolumefraction,subscript?
w?
and?
a?
denotewaterandairrespectively.oncethewaterandair?
svolumefractionsareknown,alltheirunknownquantityandcharacteristicparametercanbedenotedbyaveragevolumefraction.trackingthewater-airinterfacecanbesolvedbynetherconsecutiveequation.
?
aw?
t
?
v?
?
aw?
0
thereinto,?
v?
denotesvelocityvector.
b.boundaryconditions
c.theresultforbedpan’svofanalysis
accordingtotheabovecomputingconditions,defininginitialfilledwithwater,andwecangettheresultofthebedpan?
sconditionis,watertankandwaterenvelopareallflushingprocessin0-6s.1)flushingproces
thefigure4showsflowingfielddistributionsatdifferent
moment.
figure4.distributingofflowatdifferentmomentbysimulationforthe
variationalsectionbedpan
inthefiguresabove,areasinredcolourrepresentwater,areasinnavybluerepresentair,othercoloursrepresentthemixtureofwaterandair.contrastingtheflowfielddistributionoftheconstantsectionbedpantothevariationalsectionbedpan,wewillfound,totheconstantsectionbedpan,pipe?
stiptopduringwhile0-5s,towaterthevariationalcaputhasn?
tsectiongottenbedpan,acrosswaterthecaputhasalreadygottenacrossduring0-1sandin5.6s,waterbecauseinwhenthewarpthewaterhasflowedcaputoutgotcompletely.acrossthepipe?
sthismainlytiptop,thesiphonicphenomenonhappens.waterwarp?
soutflowincreaseslargely.thismakeswaterleveldroprapidlyandreachlowestlevelinwarp,andthenthesiphonicphenomenonstops,watervelocitybecomeslower,waterthathasnotgottenacrossthepipe?
stiptopstarttoturnback,andfinallybecomeleveloff.2)pressuredistribution
thefigure5showspressuredist
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