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Chapter6EXHAUSTSYSTEM

背景知識(shí)汽車的排氣系統(tǒng)功能主要是排放汽車尾氣。構(gòu)造上細(xì)分為尾氣管(TheTailpipe)消音器(TheMuffler)排氣歧管(TheExhaustManifoldandHeader)集氣管(ManifoldtoExhaustPipeGaskets)排氣管(ExhaustPipeHangers)這幾大主要部件。。

Chapter6EXHAUSTSYSTEM

Theexhaustsystemcarriesexhaustgasesfromtheengine’scombustionchambertotheatmosphereandreduces,ormuffles,enginenoise.Exhaustgasesleavetheengineinapipe,travelingthroughacatalyticconverterandamufflerbeforeexitingthroughthetailpipe.譯文:排氣系統(tǒng)將來自發(fā)動(dòng)機(jī)燃燒室的廢氣排放到空氣中去,并減小或消除發(fā)動(dòng)機(jī)噪音。廢氣從發(fā)動(dòng)機(jī)排出,經(jīng)過排氣管道通過催化轉(zhuǎn)換器和消聲器,最后通過尾管排到大氣中去。Chapter6EXHAUSTSYSTEM1.TheTailpipeThetailpipeisalongmetaltubeattachedtothemuffler.Itsticksoutfromunderthebodyofacar,attherear,inordertodischargetheexhaustgasesfromthemuffleroftheengineintotheairoutsidethecar.譯文:尾管是與消聲器相連的長長的金屬管,它從汽車車身后部伸出,將來自發(fā)動(dòng)機(jī)消聲器的廢氣排到汽車以外的大氣中去。Chapter6EXHAUSTSYSTEM2.TheMufflerExhaustgasesleavetheengineunderextremelyhighpressure.Ifthesegasesescapeddirectlyfromtheengine,thenoisewouldbetremendous.Forthisreason,theexhaustmanifoldsendsthegasestoamufflerwheretheygothroughmetalplates,ortubes,withaseriesofholes.Thepressureofthegasesisreducedwhentheypassthroughthemuffler,sotheygooutofthetailpipequietly.譯文:廢氣在高壓下離開發(fā)動(dòng)機(jī)。如果這些廢氣直接從發(fā)動(dòng)機(jī)排出,將會(huì)產(chǎn)生巨大的噪音。因此,排氣歧管將廢氣送到消聲器,廢氣通過有著許多孔洞的金屬盤或管道。當(dāng)廢氣通過消聲器,壓力被減小,這樣廢氣就可以安靜地排出尾管。Chapter6EXHAUSTSYSTEM2.TheMufflerThemufflerismadeofmetalandislocatedunderneaththebodyofacar.It’sconnectedbetweenthetailpipeandthecatalyticconverter.譯文:消聲器由金屬做成,位于汽車車身下面。它與尾管和催化轉(zhuǎn)換器相連。Chapter6EXHAUSTSYSTEMTherearetwotypesofmufflerdesign.Onetypeusesseveralbaffledchamberstoreducenoise.Theothertypesendsthegasesstraightthroughperforatedpipewrappedinmetalorfiberglass.Thistypeofmufflerisdesignedforthepurposeofreducingbackpressureand,consequently,makesslightlymorenoise.譯文:有兩種形式的消音器設(shè)計(jì)。一種是采用一些擋板隔腔來減小噪音,另一種是將噪音直接送到由金屬或玻璃纖維包裹的多孔管道中。這種消音器的設(shè)計(jì)是用來減小背壓,從而減小噪音。Chapter6EXHAUSTSYSTEMThemufflerquietsthenoiseoftheexhaustbymufflingthesoundwavescreatedbytheopeningandclosingoftheexhaustvalve.Whenanexhaustvalveopens,itdischargestheburnedgasesathighpressuresintotheexhaustpipe,whichisatlowpressure.Thistypeofactioncreatessoundwavesthattravelthroughtheflowinggas,movingmuchfasterthanthegasitself(upto1400mph)thatthemufflermustsilence.譯文:消聲器通過消除打開和關(guān)閉排氣門產(chǎn)生的噪音來減小排氣噪音。當(dāng)排氣門打開,它排出高壓的燃燒氣體至低壓的排氣管。這個(gè)動(dòng)作產(chǎn)生聲波,在廢氣中傳播,并且速度要比廢氣本身速度更快(達(dá)到1400英里每小時(shí))。這個(gè)噪音是消音器必須要消除的。Chapter6EXHAUSTSYSTEMItgenerallydoesthisbyconvertingthesoundwaveenergyintoheatbypassingtheexhaustgasandthroughperforatedchambersofvariedsize.Passingintotheperforationsandreflectorswithinthechamberforcesthesoundwavestodissipatetheirenergy.譯文:消音器一般將廢氣通過不同尺寸的多孔腔室,從而將聲波能轉(zhuǎn)換為熱能。廢氣通過腔室的孔洞及其在腔室內(nèi)的反射可以消耗聲波的能量。Chapter6EXHAUSTSYSTEMCarmanufacturersareexperimentingwithanelectronicmuffler,whichusessensorstomonitorthesoundwavesoftheexhaustnoise.Thesoundwavedataaresenttoacomputerthatcontrolsspeakernearthetailpipe.Thesystemgeneratessoundwave180degreesoutofphasewiththeenginenoise.譯文:汽車生產(chǎn)商正在實(shí)驗(yàn)一種電子消聲器,它使用傳感器來檢測排氣噪音聲波。聲波信號(hào)被送到計(jì)算機(jī),控制尾管附近的揚(yáng)聲器來產(chǎn)生一個(gè)與發(fā)動(dòng)機(jī)噪音180度反相的聲音。Chapter6EXHAUSTSYSTEMThesoundwavesfromtheelectronicmufflercollidewiththeexhaustsoundwavesandtheycanceleachotherout,leavingonlylow-levelheattoemergeformthetailpipe.譯文:來自電子消聲器的聲波與排氣噪音聲波相撞,互相抵消,只將較少的能量由尾管排出。Chapter6EXHAUSTSYSTEM3.TheExhaustManifoldandHeaderTheexhaustmanifold,usuallyconstructedofcastiron,isapipethatconductstheexhaustgasesfromthecombustionchamberstotheexhaustpipe.Ithassmoothcurvesinitforimprovingtheflowofexhaust.

譯文:排氣歧管一般由鑄鐵做成,將廢氣由燃燒室送到排氣管。排氣歧管內(nèi)有著光滑的表面,這是為了提高廢氣的流動(dòng)。Chapter6EXHAUSTSYSTEM3.TheExhaustManifoldandHeaderTheexhaustmanifoldisboltedtothecylinderhead,andhasentrancesfortheairthatisinjectedintoit.Itisusuallylocatedundertheintakemanifold.Aheaderisadifferenttypeofmanifold,itismadeofseparateequal-lengthtubes.譯文:排氣歧管使用螺栓連接在氣缸蓋上,有著供空氣噴入的通道。它同樣位于進(jìn)氣歧管的下面。集氣管是另一種形式的歧管,它由許多獨(dú)立等長的管道組成。Chapter6EXHAUSTSYSTEM4.ManifoldtoExhaustPipeGasketsThereareseveraltypesofgasketsthatconnectstheexhaustpipetothemanifold.Oneisaflatsurfacegasket.Anothertypeusesaballandsocketwithspringstomaintainpressure.Thistypeallowssomeflexibilitywithoutbreakageofthesealorthemanifold.Athirdtypeisthefullballconnectortype,whichalsoallowsalittleflexibility.譯文:有幾種類型連接排氣管和歧管的墊圈。一種是平面墊圈。另一種使用球鉸式墊圈,使用彈簧來保持壓力,它可以在不破壞密封和歧管的條件下允許產(chǎn)生一定的變形。第三種是全球式接頭墊圈,它也允許產(chǎn)生少量的變形。Chapter6EXHAUSTSYSTEM5.ExhaustPipeHangersHangersholdtheexhaustsysteminplace.Theygivethesystemflexibilityandreducethenoiselevel.Thehangersystemconsistsofrubberrings,tubesandclamps.譯文:排氣管吊耳將排氣系統(tǒng)固定住,并且使得排氣系統(tǒng)有一定的靈活性和減小噪音級(jí)別。吊耳系統(tǒng)由橡膠圈,管子和夾具組成。Chapter6EXHAUSTSYSTEM6.ExhaustPipeTheexhaustpipeisthebent-uporconvolutedpipesunderneathacar.Someareshapedtogoovertherearaxle,allowingtherearaxletomoveupanddownwithoutbumpingintotheexhaustpipe,someareshapedtobendaroundunderthefloorofthecar,connectingthecatalyticconverterwiththemuffler.譯文:排氣管彎曲盤旋于汽車底部。一些排氣管布置在后軸上,這樣后軸上下跳動(dòng)就不會(huì)撞擊到排氣管,一些盤旋彎曲于汽車底盤上,連接催化轉(zhuǎn)換器和消聲器。Chapter6EXHAUSTSYSTEM6.ExhaustPipeExhaustpipesareusuallymadeoutofstainlesssteel,sincethehighheatconditionsinvolvedwiththemufflersystemwillcauserust.譯文:由于消聲器的高溫環(huán)境容易產(chǎn)生銹,所以排氣管一般采用不銹鋼做成。Chapter6EXHAUSTSYSTEM7.DualExhaustSystemTheadvantageofadualexhaustsystemisthattheengineexhaustsmorefreely,therebyloweringthebackpressure,whichisinherentinanexhaustsystem.Withadualsystem,asizableincreaseinenginehorsepowercanbeobtainedbecausethebreathingcapacityoftheengineisimproved,leavinglessexhaustgasesintheenginesattheendofeachexhauststroke.This,inturn,leavesmoreroomforanextraintakeoftheair-fuelmixture.譯文:雙排氣系統(tǒng)的優(yōu)勢就是發(fā)動(dòng)機(jī)能夠更自由地排氣,因此可以降低排氣系統(tǒng)固有的背壓。裝有雙排氣系統(tǒng)的發(fā)動(dòng)機(jī)可以獲得相當(dāng)大的功率提升,這是因?yàn)榘l(fā)動(dòng)機(jī)進(jìn)氣的能力得到了改善。每次排氣沖程末端,更少的廢氣被留在發(fā)動(dòng)機(jī)內(nèi),從而給發(fā)動(dòng)機(jī)吸入可燃混和氣留下更多的空間。Chapter6EXHAUSTSYSTEMExercise1Carbonmonoxide(CO)alsoincreasestherateatwhichthephotochemicalsmogisformedbyspeedinguptheconversionofnitricoxide(NO)tonitrogendioxide.一氧化碳也增加了光化學(xué)煙霧形成的幾率。因?yàn)橐谎趸即龠M(jìn)了一氧化氮向二氧化氮的轉(zhuǎn)變。2Oxideofsulfurwereinitiallyignoredintheexhaustsystem,sincethesulfurcontentofgasolineasafuelislessthan1/10of1percent.Becauseofthissmallamount,itwasfeltthatitcontributedverylittletotheoverallpollutionproblem.However,theautomobileexhaustsystem,whenequippedwithacatalyticconverter,changesthesulfurdioxideintosulfurtri

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