轮机英语（二三管轮）Lesson 1 Marine Propulsion System.ppt

Unit1MainPropulsionPlantLesson1MarinePropulsionSystem1.1Reciprocatingdieselengines1.2Dual-fuelEngines1.3SteamturbinesNewWordsandExpressionspropulsion[pr??p?l?n]n.推进；推进力primemover原动机transmission[tr?nz?m??n]n.传动装置propulsor[pr?up?ls?]n.推进器diesel[?di?zl]n.柴油机；柴油crankshaft[?kr??k?ɑ?ft]n.曲轴propellerpr??pel?(r)螺旋桨reductiongearbox减速齿轮箱NewWordsandExpressionsalternator[???lt?ne?t?(r)]n.交流发电机turbine[?t??ba?n]n.涡轮；涡轮机launch[l??nt?]v.使(船)下水；(船)下水；出海vessel[?vesl]n.船，舰shaft[?ɑ?ft]n.轴；传动轴gearbox[?ɡ??b?ks]n.齿轮箱bearing[?be?r??]n.轴承pitch[p?t?]n.螺距CompositionofatypicalpropulsionsystemThefunctionofprimemoveristodelivermechanicalenergytothepropulsor,andsometimestogeneratesimultaneouslytheneededelectricpowerforvariousapplicationsonboardtheship(lighting,controlsystems,pumps,navigationequipment,HVAC,etc.)(原动机的作用是将机械能输送到推进器，有时还能同时产生船上各种应用所需的电力（如照明、控制系统、泵、导航设备、暖通空等）。1.1Reciprocatingdieselengines1.1Reciprocatingdieselengines1.1ReciprocatingdieselenginesThesizeofthedifferenttypesofenginesisanimportantfactorinselectingwhatwillbeinstalledinanewship.Slowspeedtwo-strokeenginesaremuchtaller,butthefootprintrequiredissmallerthanthatneededforequivalentlyratedfour-strokemediumspeeddieselengines.Asspaceabovethewaterlineisatapremiuminpassengershipsandferries(especiallyoneswithacardeck),theseshipstendtousemultiplemediumspeedenginesresultinginalonger,lowerengineroomthanthatneededfortwo-strokedieselengines.Multipleengineinstallationsalsogiveredundancyintheeventofmechanicalfailureofoneormoreengines,andthepotentialforgreaterefficiencyoverawiderrangeofoperatingconditions.（在一台或多台发动机发生机械故障时，多台发动机的安装方式也提供了冗余，并有可能在更大范围的工况条件下获得较高的效率。）1.1Reciprocatingdieselengines1.2Dual-fuelEnginesDual-fuelenginesarefueledbyeithermarin