規(guī)整填料單元內流場的ldv測量及其小波分析

1、天津大學碩士學位論文規(guī)整填料單元內流場的LDV測量及其小波分析LDVMeasurementsofFlowFieldinStructuredPackingUnitandWaveletAnalysis專業(yè)：研究生：指導教師：天津大學化工學院二零零六年元月ABSTRACTIthaslongbeenrecognizedthattheflowpattern，especiallythevelocitydistributionofthefluid，i

2、sofgreatimportanceindeterminingtheperformanceoftheequipmentwhichusingstructuredpackingastheirinternalsButdetailedlocalinformationOnthehydrodynamicsofstructuredpackedcolumnsisratherscarceinliteratureByusingthree—dimension

3、allaserDopplervelocimetry(LDV)，theliquidvelocitydistributionoftheglycerolaqueoussolutionwasmeasuredinatypicalunitofstructuredpacking(Mellapak350Y)Timeaveragedthree—dimensionalvelocitydistributionsoftheunitweremeasuredatd

4、ifferentflowratesTheexperimentaldatashowedthattheliquidvelocityprofileofthesinglephaseflowiscomplexbecauseofthespecialgeometryoftheunitofstructuredpackingInthecentreregionoftheunit，theliquidwasmixedandredistributedThatwa

5、sthecausegeneratingthevortexesandsecondaryflowThevelocitydistributionvariedindifferentflowvelocity’TheturbulenceenergywascalculatedandtheturbulenceenergydistributionofthemiddlesectionwasobtainedComparedwiththevelocityvec

6、tormap，itwasfoundthatthehigherturbulencewasfoundinthecentrevortexregionandrefluentregionsatthebottomandtopofthepackingTofurtherunderstandtheintrinsicfeaturesofturbulenceinthestructuredpacking，wavelettransformanalysisWaSa

7、doptedItisindicatedbypowerdistributionforvaryingwaveletscalesthatthefluidflowinstructuredpackingisananisotropicturbulenceatallscalesThisstudyshowsthatmappingandanalyzingtheflowfieldinthestructuredpackingusingtheadvancede

8、xperimentalaswellasdataanalysistechniquesmayindeedbepossibleStudiesinthisdirectionwouldhelpinthedesign，optimizationandoperationofthestructuredpackingcolumnsThemethodologyisthereforesuitableforevaluatinghydrodynamicsandtu