离心泵内流数值计算的湍流模型分析

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1、论文Withtherapiddevelopmentofcomputationalfluiddynamics(CFD)andcomputertechnology,numericalsimulationhasbeenwidelyappliedtotheengineeringproject．ReynoldsAveragedNavier-Stokes(RANS)methodusedinnumefiCalsimulationhasarelativelylowdemandonthecomputer’Sperformanc

2、e，andthecalculationresultscallsatisfythecertainaccuracyrequirementsoftheengineeringproject．Therefore，RANSbecomesthedominatedmethodinthenumericalcalculationoftheengineeringprojectatpresentandfuture．AsanimportantpartofCFDtechnology,turbulencemodelsinRANSwilld

3、irectlyimpactontheaccuracyandstabilityofthenumeficalsimulation，andvariousturbulencemodelshaveemergedatthismoment．ButthereisnoturbulencemodelwhichCallbeusedforalltypesoffluidfields，then,theappropriateturbulencemodelisusuallychosenaccordingtoproperfluidfield．

4、Becauseoftheinnerflowofpumpisthecomplexthree-dimensionalturbulenceflow．Thoughsometurbulencemodelsareappliedtothenumeficalsimulationofpumpinnerflowandgotgoodcalculationresults，thestabilityandgeneralityofthenumefiCalsimulation，theaccuracyofthecalculationresul

5、tsarestillfarfromthemorerefinementrequirementsformodemengineeringprojects．Therefore，thestudyofturbulencemodelshasbecomeanimportantissueinthenumericalsimulationofpump．Themainresearchcontentsofthispaperareasbelow：1．ThepresentstudysituationOilturbulencemodelsw

6、eresystematicallysummarized．Theadvantagesanddisadvantagesoftheseturbulencemodelswereanalysed．2．Forthecalculationofinnerflowinpumps，fiveturbulencemodelswerechosenforthestudy,includingstandardk-emodel，RNGk-emodel，Realizablek-emodel，k-comodelandSSTk-comodel．Fl

7、uentWasusedtonumericalsimulatetheinnerflowin15pumps丽mdifferentspecificspeed．Theratios(Q／蚴oftheflowrateare0．8、1．0、1．2respectively．Then，energyperformanceandinnerflowfieldwerecomparedandanalysed．Fromtheoveralltrelldoftheanalysis，thecalculationresultsoftheSSTk-

8、comodelaremorestabilityandaccurarythanthatoftheothertwo-equationmodels．3．ThetwoimprovementprogramsfortheSSTk-comodelareproposedinthispaper．ForSSTk-comodel，k-comodelisusedintheboundarylayerandstandardk-