規(guī)整填料單元內(nèi)流場(chǎng)的ldv測(cè)量及其小波分析

1、天津大學(xué)碩士學(xué)位論文規(guī)整填料單元內(nèi)流場(chǎng)的LDV測(cè)量及其小波分析LDVMeasurementsofFlowFieldinStructuredPackingUnitandWaveletAnalysis專業(yè)：研究生：指導(dǎo)教師：天津大學(xué)化工學(xué)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