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1、上海交通大学硕士学位论文ABSTRACTFLOWFIELDANDSTRUCTUREANALYSISONLOWPRESSURECYLINDEREXHAUSTPIPEOF1000MWDIRECTAIRCOOLINGSTEAMTURBINESETABSTRACTElectricpower,thebasicofmodernindustry,playsanimportantroleinnationaleconomy.It’ssignificanttoresearchthepowerplantsetanditscomponents.Plentyofwaterisneededforthepow
2、erplantcycle.Tosavethewaterresources,thepowerplantsattachgreatimportancetotheuseofdirectaircoolingsteamturbinesetsinnorthernChina.Theaircondenserof1000MWdirectaircoolingsteamturbinesetislaidoutoftheworkshop,andthesteamisdirectlyledtotheoutsideaircondenserthroughtheexhaustpipe.Inthispaper,thea
3、nalysisforthecapabilityofthroughflowofexhaustpipeandthestructureofitiscarriedout.Thus,designerscanregardtheabovecalculatingresultsasareferencetoselectproperliquidparameterscondition,improvethestructureofmodel,andjudgethestabilityunderloading,andsoon.Firstly,byusingtheFLUENTsoftware,thepaperca
4、rriesoutathree-dimensionalcalculationonthesteamflowfieldintheexhaustpipe,gettingtoknowtheflowfielddistribution,thecoefficientofdragandthelossofpressure.Thevelocityofflowinsomesituationalsowillcometoaresult.Theimpedeeffectthattheinnerstaypipestotheflowingsteamisresearchedaccordingtotheaerodyna
5、mics.Therefluenceinthelowpressureareaisanalyzedandsomeimprovedmeasures,suchasrebuildingtheoriginalconformationoftheexhaustpipe,oraddingsomenewguideplatesinsidethepipe,willbeintroducedtoenhancethecapabilityofthroughflowofexhaustpipeinmanydifferentflowconditions.Secondly,byusingtheANSYSsoftware
6、,thestructureoftheexhaustpipeisanalyzedandmodeledaccordingtothebasicdesignprojectofit.TheIII上海交通大学硕士学位论文ABSTRACTstructureoftheexhaustpipeiscalculatedtoanalyzethestressandstrainoftheexhaustpipeunderthegravity,thepressuredifferencebetweentheatmosphericpressureandinnerpartialvacuum,theforceandth
7、emomentofforceatthejawoftheexternalexhaustpipe.Thepaperthencheckswhetherthestressandstrainisadaptedtotheallowablestressanddeformationofthematerialsandthestructure,makingsomeimprovementonthelargedeformationandstressareas.Andthen,thepaperanalyz
