机械类文献翻译发动机冷却系统Word格式.docx

机械类文献翻译发动机冷却系统Word格式.docx

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机械类文献翻译发动机冷却系统@#@1Summarize@#@Outlineusesamorecompactdesignalongwiththeengineandhasinabigway,theengineproducesthewasteheatdensityalsoobviouslyincreasesalongwithit.Someessentialregions,ifaroundarowoftyrevalveradiatesthequestiontohavefirsttoconsider,thecoolingsystemevenifappearsthesmallbreakdownalsopossiblytocreatethedisasterinsuchregionconsequence.Theenginecoolingsystemradiationabilitygenerallyshouldsatisfywhentheenginefullloadradiationdemand,becausethistimeengineproducesthequantityofheatisbiggest.However,whenpartialloads,thecurrentcapacitywhichthecoolingsystemcanhavethepowerloss,whichthewaterpumpingstationprovidestherefrigerantcurrentcapacitysurpassesneeds.Wehopedstartsthestartingtimetobeasfaraspossibleshort.Becauseenginetimedischargespollutantmore,theoilconsumptionisalsobig.Thecoolingsystemstructurehasamoretremendousinfluencetotheenginecoldstartingtime.@#@2Characteristicsofmodernenginecoolingsystem@#@Modernenginesseriescharacteristictraditioncoolingsystemfunctionreliablyprotectstheengine,butalsoshouldhavethefunctionwhichtheimprovementfueleconomyandreducesdischarges.Therefore,themoderncoolingsystemmustsynthesizeundertheconsiderationthefactor:

@#@Engineinteriorfrictionloss;@#@Coolingsystemwaterpumppower;@#@Burningboundarycondition,likecombustionchambertemperature,completedensity,completetemperature.Theadvancedcoolingsystemusessystematized,themodulardesignmethod,theoverallplanconsideredeachinfluencefactor,causesthecoolingsystembothtoguaranteetheenginenormalwork,andenhancestheengineefficiencyandthereductiondischarges.@#@2.1Thetemperaturessetpoint@#@Temperatureshypothesesfiringinburstsmotiveoperatingtemperaturelimitvaluearedecidedbyarowoftirevalvetheperipheralregionmaximumtemperature.Themostidealsituationisaccordingtothemetaltemperaturebutisnottherefrigeranttemperaturecontrolcoolingsystem,likethiscanprotecttheenginewell.Becausethecoolingsystemhypothesiscoolingtemperatureisbythefullloadtimemostisbigisthefoundation,therefore,engineandcoolingsysteminpartialloadstimeisatnottootheperfectcondition,whenurbandistricttravelandlowspeedtravel,canhavethehighoilconsumptionanddischarge.Supposesthefixedpointthroughthechangerefrigeranttemperaturetobepossibletoimprovetheengineandthecoolingsysteminpartialloadstimeperformance.Accordingtoarowoftyrevalvetheperipheralregiontemperaturelimitvalue,mayelevateeitherreducetherefrigerantorthemetaltemperaturesupposesthefixedpoint.Elevatesorreducedtemperatureallrespectivelyhasthecharacteristic,thisisdecidedthegoalwhichachievedtothehope.@#@2.2Enhancesthetemperature@#@Enhancesthetemperaturetosupposethefixed-pointenhancementoperatingtemperaturetosupposethefixedpointisonekindofcomparisonthemethodwhichwelcome.Enhancesthetemperaturetohavemanymerits,itdirectlyaffectstheenginelossandthecoolingsystemeffectaswellastheenginedischargingformation.WillenhancetheoperatingtemperaturetoenhancetheengineMacreducetheenginetorubwears,reducestheenginefueloilconsumption.Theresearchindicatedthat,theengineoperatingtemperaturetorubsthelosstohavetheverytremendousinfluence.Dischargesthetemperaturetherefrigeranttoenhanceto150℃,causesthecylindertemperaturetoelevateto195℃,theoilconsumptiondrops4%-6%.Maintainstherefrigeranttemperaturein90-115℃scope,causestheenginemachineoilthemaximumtemperatureis140℃,thenoilconsumptioninpartialloadstimedrops10%.Enhancestheoperatingtemperaturealsoobviousinfluencecoolingsystemthepotency.Enhancestherefrigerantorthemetaltemperaturecanimprovetheengineanddispersethesteamheattransfertransmissiontheeffect,reducestherefrigerantthespeedofflow,reducesthewaterpumptheratedpower,thusreducestheenginethepowerdissipation.Inaddition,mayselectthedifferentmethod,furtherreducestherefrigerantthespeedofflow.@#@2.3Reducethetemperaturessetpoint@#@Reducedtemperaturessupposethefixedpointtoreducethecoolingsystemtheoperatingtemperaturetobepossibletoenhancetheenginechargeefficiency,reducestheinlettemperature.Thistothecombustionprocess,thefueloilefficiencyanddischargesadvantageously.Thereducedtemperaturesupposesthefixedpointtobeallowedtosavetheenginemovementcost,enhancesthepartservicelife.Theresearchindicated,ifthecylinderheadtemperaturereducesto50℃,theignitionangleofadvancemay3℃Abutnothavetheengineknockaheadoftime,thechargeefficiencyenhances2%,theengineoperationalfactorimprovement,ishelpfultothe