内燃机专业英语英文

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1、内燃机专业英语自编讲义部分：1.EngineClassificationandOverallMechanicsTheautomobileenginescanbeclassifiedaccordingto:1.numberofcylinders;2.arrangementofcylinders;3.arrangementofvalves;4.typeofcooling;5.numberofcycles(twoorfour);6.typeoffuelburned;7.typeofignition.Theengineisthesour

2、ceofpowerthatmakesthewheelsgoaroundandthecarmove.Theautomobileengineisaninternal-combustionenginebecausethefuel(gasoline)isburnedinsideit.Theburningofgasolineinsidetheengineproduceshighpressureintheenginecombustionchamber.Thishighpressureforcespistontomove,themovemen

3、tiscarriedbyconnectingrodstotheenginecrankshaft.Thecrankshaftisthusmadetorotate;therotarymotioniscarriedthroughthepowertraintothecarwheelssothattheyrotateandthemoves.Theenginerequiresafuelsystemtosupplyitwithamixtureofairandfuel.Thefuelsystemdoesthisbypumpingliquidga

4、solinefromatankintothecarburetor,amixingdevicethatmixesthegasolinewithair.Themixtureisdeliveredtotheenginewhereitisburned.Theenginealsoneedsacoolingsystem,thecombustionoftheair-fuelmixtureintheenginecreatesaveryhightemperature(ashighas2000to2700℃).Thecoolingsystemtak

5、esheatawayfromtheenginebycirculatingaliquidcoolant(watermixedwithantifreeze)betweentheengineandaradiator.Thecoolantgetshotasitgoesthroughtheengine.Itcoolsoffasitgoesthroughtheradiator.Thus,thecoolantcontinuallytakesheatawayfromtheengine,whereitcoulddodamage,anddelive

6、rsittotheradiator.Airpassingthroughtheradiatortakesheatawayfromtheradiator.Theenginealsoincludesalubricatingsystem.Thepurposeofthelubricatingsystemistosupplyallmovingpartsinsidetheenginewithlubricatingoil;theoilkeepsmovingpartsfromwearingexcessively.Theenginerequires

7、afourthsystem,theignitionsystem.Theignitionsystemprovideshigh-voltageelectricsparksthatignite,orsetfireto,thechargesofair-fuelmixtureintheenginecombustionchambers.Thefifthisstartingsystemanditspurposeistochangetheelectricalcurrentintothemechanicalenergytopushthecrank

8、-shaftaround.Bymeansofthis,theenginecanbestarted.Thesefivesystemsarediscussedbrieflyinfollowingsections.WordsandExpressionscombusti