双层rushton桨搅拌槽内流场的piv分析与pod分析

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1、北京化工人学硕‘Ij学位论文的搅拌槽内产生的尾涡，其轨迹线比较一致。相应参数△t及p对于尾涡迹线的影响则非常微弱。本文还采用本征正交分解(POD)分别对双层桨流场和单层桨流场进行了分析，结果显示，POD分析能够仅利用前几个模态就能够获得流场中最主要的特征，并获得相应特征结构的含能量。这也表明了POD分析在提取流场主要特性方面的优越性。关键词：双层桨，PIV，湍流动能，尾涡，POD分析ABSTRACTPIVEXPERIMENTSANDPODANALYSISoFFLoWCHARACTERISTICSINDUALRUSHToNTURBIN

2、ESTIRREDTANKSStudyingflowcharacteristicsinstin．edtanksisofgreatimponancef．orincreasingemciencyandreducingenergyconsulnptionbecauseagitatorsarewidelyusedinindustryprocess。Inthispaper，Velocity，TKEandtrailingvortexofmergingnowindual—RushtonstiHedtahkswerestudiedbyPIVMoreo

3、veLthedistributionofTKEandthetransmissioncharacte“sticsinstirredtankswerestudiedbyPODanalysis．Thediameterofthestirredtankusedinthisexperimentwas476mm，andH=T．Theef佗ctof△tandthebladearrangementBontheflowfieldwerestudiedinthispaper．Threeconditionsof△t，△t=150Us，△t=260Usand

4、△t=400us，wereusedinthisexperiment．Theresultsshowedthat△thadnoinfluenceonflowpattemandthedistributionofphase-aVeragedVelocityandTKE．Butwiththeincreasingof△t，medataV01atilitywasincreasedwiththedataaccuracydecreased，andthemosterrorcouldreach66．7％．ThebladeIII北京化工大学颂：：卜学位论文

5、—————————————————————————————————————————————————————————————————————————————————————————————一一——————————————————————一arrangementsp20。，15。，30。and45。werestudiedrespectively．Theresultsshowedthatithadnoinfluenceonboththedistrjbutionandthevalueofphase—aVeragedVelocityandTK

6、E，butithadagreatinlpactonphase—res01vedVelocityandTKE．MoreoVer，theflow6eldatthesamephaseanglewassimilar．Inthispaper，九2criterionwasusedtoidentif．ythecoresoftra订ingVortex．Itfoundthatthetrajectoriesoftrailingvortexcoresindual—Rushtonsystenlwerethesameasthatinsingle—Rushto

7、nsystemwhichwasfaraway仔omtheimpellerasthephaseangleincreasing．TheresultsalsoshowedthatthepositionofVortexcorewouldaf-fectthetrajecto打esofthetra订ingvonicesandthetrailingVorticesgeneratedinthesimilargeomet‘呵tankswerecoincidencewitheachother．】Ⅵoreover，thetwoparameters，△ta

8、ndB，hadnobiginfluenceontrailingVortices．Inthispaper，PODanalysiswasusedtoanalyzeboththedual一Rushtonandsingle—Rushtonsy