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1、学校代码:10128学号:031203060本科毕业论文外文翻译(题目:空冷热交换器和空冷塔学生姓名:学院:电力学院系别:能源与动力工程专业:热能与动力工程班级:动本2003②指导教师:二〇〇七年六月内蒙古工业大学本科毕业论文Air-cooledHeatExchangersandCoolingTowersD.G.KROGERSc.D.(MIT)(ThistextisapartofMRKROGER'sbook.include8.4,9.3,9.4)8.4RECIRCULATIONHeatedplumeairmayrecirculateinanair-cooledheatexchange
2、r,therebyreducingthecoolingeffectivenessofthesystem.Figure8.4.1depicts,schematically,across-sectionofanair-cooledheatexchanger.Intheabsenceofwind,thebuoyantjetorplumerisesverticallyabovetheheatexchanger.Apartofthewarmplumeairmayhoweverbedrawnbackintotheinletofthetower.Thisphenomenonisknownas"re
3、circulation".Plumerecirculationisusuallyavariablephenomenoninfluencedbymanyfactors,includingheatexchangerconfigurationandorientation,surroundingstructuresandprevailingweatherconditions.Becauseofhigherdischargevelocities,recirculationisusuallylessininduceddraftthaninforceddraftdesigns.Figure8.4.
4、1:Air-flowpatternaboutforceddraftair-cooledheatexchanger.Lichtenstein[51LI1]definesarecirculationfactoras(8.4.1)wheremristherecirculatingairmassflowrate,whilemaistheambientairflowrateintotheheatexchanger.Althoughtheresultsofnumerousstudiesonrecirculationdoappearintheliterature,mostareexperiment
5、alinvestigationsperformedonheatexchangershavingspecificgeometriesandoperatingunderprescribedconditionse.g.[74KE1,81SL1].GunterandShipes[72GUlldefinecertainrecirculationflowlimitsandpresenttheresultsoffieldtestsperformedonair-cooledheatexchangers.Problemsassociatedwithsolvingrecirculatingflowpat
6、ternsnumericallyhavebeenreported[81EP1].Krogeretal.investigatedthe19内蒙古工业大学本科毕业论文problemanalytically,experimentallyandnumericallyandrecommendaspecificequationwithwhichtheperformanceeffectivenessofessentiallytwo-dimensionalmechanicaldraftheatexchangersexperiencingrecirculation,canbepredicted[88K
7、R1,89KR1,91DU1,93DU1,95DU1].8.4.1RECIRCULATIONANALYSISConsideronehalfofatwo-dimensionalmechanicaldraftair-cooledheatexchangerinwhichrecirculationoccurs.Forpurposesofanalysis,theheatexchangerisrepresentedbyastraightlineatanelevatio
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