.轮机英语（轮机长大管轮）Lesson 3 Performance parameters of marine diesel engine.ppt

Lesson3PerformanceparametersofmarinedieselengineNewWordsandExpressionselectricity[?l?ktr?s?ti]n.电力；电流；强烈的紧张情绪kilowatt[k?l?wɑt]n.[电]千瓦（功率单位）cylinder[s?l?nd?]n.圆筒；汽缸；[数]柱面；圆柱状物indicator[?nd?ket?]n.指标，标志，迹象；指示器crankshaft[kr??k??ft]n.曲轴；机轴flange[fl?nd?]n.[机]法兰；[机][古生]凸缘；轮缘；边缘vt.给…装凸缘brake[brek]v.刹车NewWordsandExpressionsdynamometer[,da?n?mɑm?t?]n.测力计；功率计；动力计torsionmeter[t?:??n,mi:t?]n.扭矩测量仪；扭力计entail[?ntel]vt.使需要，必需；承担；遗传给；蕴含n.引起；需要；继承discard[d?s?kɑ?rd]v.放弃n.抛弃；被丢弃的东西或人shorthand[??rth?nd]n.速记；速记法denote[d?not]vt.表示，指示NewWordsandExpressionsresonant[r?zn?nt]adj.洪亮的，共振的；共鸣的damp[d?mp]vt.使潮湿；使阻尼；使沮丧，抑制vi.减幅，阻尼；变潮湿elastically[?l?st?kli]adv.有弹性地；伸缩自如地amplitude[?mpl?t?d]n.振幅；丰富，充足；广阔elastic[?l?st?k]adj.有弹性的；灵活的；易伸缩的n.松紧带；橡皮圈sinusoidal[,s?n?s??dl]adj.正弦曲线的stiffness[st?fn?s]n.僵硬；坚硬；不自然；顽固Theonlyreasonapracticalengineerwantstorunanengineeratallistoachieveadesiredoutputofusefulwork,whichis,forourpresentpurposes,todriveashipatprescribedspeed,and/ortoprovideelectricityataprescribedkilowatt.驱动现场工程师的唯一理由是让其完成一个有输出效果有用的工作，就目前的实际意义来看，让船舶在既定的航速航行或者让电力在既定的功率运转是我们的目的。THERMALEFFICIENCYThermalefficiency（）istheoverallmeasureofperformance.Inabsolutetermsitisequalto:Aslongastheunitsusedagreeitdoesnotmatterwhethertheheatorworkisexpressedinpounds-feet,kilograms-meters.But，calories,kWhorjoules.TherecommendedunitstousearenowthoseoftheSIsystem. Heatconvertedintoworkperhour=Nkwh=3600NkJTHERMALEFFICIENCYWhereN=thepoweroutputinKWHeatsupplied=M×KWhereM=massoffuelusedperhourinkgandK=calorificvalueofthefuelinkJ/kgthereforeItisnownecessarytodecidewheretheworkistobemeasured.Ifitistobemeasuredinthecylinders,asitusuallydoneinslow-runningmachinery,bymeansofanindicator,thework