机电工程专业英语 教学课件 作者 朱晓玲 Lesson 22 Internal Combustion Engine.ppt

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1、Lesson22InternalCombustionEngine词汇讲解课文分析练习答案本课教学目标：掌握内燃机的分类方法；掌握与内燃机相关的专业词汇；翻译技巧：信*达*雅SectionⅠ：wordsandphasesSeeifyoucanpronouncethesewordsrightly:exothermic[9eksEJ`W:mIk]adj.[化]发热的petroleum[pi5trEuliEm]n.石油turbocharge[`t:bEJtFB:dV]vt.用涡轮给(发动机)增压Paycloseattentiontothewordsconcerni

2、nganinternalcombustionenginepistonrotorconnectingrodcylinderNowpleaserememberthenewwordsandphrasesasfastasyoucan.SectionⅡ：textAtfirst,readthefirstparagraphsilentlyin3minutes,please.paragraphⅠ:Theinternalcombustionengineisaheatengineinwhichtheburningofafueloccursinaconfinedspacecalle

3、dacombustionchamber.Thisexothermicreactionofafuelwithanoxidizercreatesgasesofhightemperatureandpressure,whicharepermittedtoexpand.Thedefiningfeatureofaninternalcombustionengineisthatusefulworkisperformedbytheexpandinghotgasesactingdirectlytocausemovement,forexamplebyactingonpistons,

4、rotors,orevenbypressingonandmovingtheentireengineitself.内燃机是一种热机，燃料在其被称为燃烧室的密封空间内燃烧。燃料和氧化剂间的放热反应产生可膨胀的高温高压气体。内燃机的显著特点是能做有用功，即膨胀的受热气体直接作用在物体上并使其运动，如活塞、转子，乃至整个内燃机本身。OralEnglishpractice:What’saninternalcombustionengine?Saywhat’syouknowaboutaninternalcombustionengineasmuchasyoucan.Readt

5、hesecondparagraphsilentlyintwominutes,please.paragraphⅡ:Carenginesvaryindesign,butcertainelementsarecommontoallenginesandareusedforengineclassification.Enginescanbeclassifiedinseveralwayssuchasthenumberofcylinders,thegeometryoftheblock,ortypeofignitionsystemused.Thetwomajorenginetyp

6、esinusearesparkignition(gasolineengine)andcompressionignition(dieselengine)whichusedifferenttypesoffuel.Thefollowingarewaysenginesareclassified.汽车内燃机因设计的不同而不同，但某些元件是所有内燃机所共有的，并用作内燃机的分类依据。内燃机可按气缸的数目、气缸的排列方式和点火系统的类型等方式分类。常用的两大类内燃机是火花点火式（汽油机）和压缩点火式（柴油机）内燃机，他们使用不同种类的燃料。下面是内燃机的分类方法。OralE

7、nglishpractice:Inhowmanywayscanenginesbeclassified?Andwhatarethey?Flipthroughthethirdparagraphintwominutes,please.paragraphⅢ:FuelBurned:Fuelburnedprovidesabroadengineclassification.Twotypesoffuelareingeneraluse:gasolineanddieseloil.Gasolinecarenginesusesparkignitionwhereasdieselengi

8、nesusecompressionig