发酵搅拌罐流场分析与结构优化

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1、江南大学硕士学位论文发酵搅拌罐流场分析与结构优化姓名：黄男男申请学位级别：硕士专业：机械设计及理论指导教师：张秋菊20090601AbstractThispaperisapartoftheresearchproject：ExtractionofHighConcentrationFermentationLiquidandCleanProductionTechnologiesofGlutamate，supportedbyState863Project(No．2006AA020303-02)．Theflowfielddistributionandpowerconsump

2、tionaretwoimportantparametersforinvestigatingtheperformanceofstirredtank．Basedontheprototypeofallactualfermentationstirredtank,thisPaDercarriedouttheflowfieldanalysisandstructuraloptimizationbyusingnumericalsimulations．Themainresearchesandconclusionsaleasfollows：(1)Accordingtotheanaly

3、sisandcomparebetweenthestirredtankwithandwithoutdraR．tubethroughthesimulationofflowfield．findthatunderthecooperationofimpellersanddraft．tube．theflowintheaxialdirectionhasbeenreinforced，andthemixtureeffectoffluidsarrangingintheupperlayerandlowerlayerrespectivelyhasbeenimprovedevidently

4、．Atthesametime．theliquidneartheimpellernolongerrotatealongwiththeimpeller．Asaresult．thepowerconsumptionofmixturehasbeendeclinedby12％comparedwiththesituationwithoutadraft．tube．andtheflowfieldinthetankhasbecomeanidealone．(2)Aftertheanalysisofmanygroupsofstructuresbychoosingstructurepara

5、meters,therearesomesatisfiedcombinationsamongthem．Intheseconditions，theflowfieldinthetankhasbeenaidealonethatflowsinainerraticway．(3)Theresearchesabouttheinfluenceofimpellerrotatingindifferentspeedandthedifferenceinpowerconsumptionhavebeenconducted．Accordingtoourconclusion，theincrease

6、oftherotatespeedofimpellerinclinetolittlechangeintheflowingpatternofthefluidsinthetank．However,thepowerconsumptionwilltripleifdoublingtherotatingspeedofimpeller．(4)Comparedwithsingle-paddlestirredtank，thepowerconsumptionofdual—paddlestirredtankincreasesasmushas170％，butabetterflowfield

7、distributioncomesout，withlargereffe：ctivemixedarea．Inaddition,AfterresearchingthedifferenceoftheflowfiledowingtOdifferentdistancebetweentwopaddlesofthedual—paddlestirredtank，theresultsshowthat：anappropriateincreaseinthedistanceisconducivetoimprovethemixingeffectandlowerpowerconsumptio

8、n．And