均质混合气压缩着火(hcci)技术解析 homogeneous charge compression

均质混合气压缩着火(hcci)技术解析 homogeneous charge compression

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时间:2018-10-01

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1、均质混合气压缩着火(HCCI)技术解析HomogeneouschargecompressionignitiontechnologyofshrinkageTheHCCIenginelikethetraditionalgasolineenginethat,mixedgassuctionuniform,butwithoutthesparkplugignition,butbyincreasingthecompressionratio,theexhaustgasrecirculation,intakeheatingandpressurizingtechnology,improvethemixture

2、incylindertemperatureandpressure,andthespontaneouscombustionofmixedgascompressor.Apluralityofignitionkernelisformedinthecylinder,effectivelymaintainthestabilityofflamecombustion,andreduceplantflamepropagationdistanceandthecombustionduration.Theburningrateitisonlyrelatedwithchemicalreactionkinetics

3、ofitself.ThecharacteristicsofdieselHCCIcombustionTherealizationofdieselHCCIcombustiontoface,facingtwodifficulties:oneisthedieseloilofhighviscosity,lowvolatility.Itisdifficulttoformahomogeneousmixture;twoisadieselisashighassixteenoctanefuel,pronetospontaneouscombustionatlowtemperaturereaction,theco

4、mbustionspeedcontroldifficultyofhomogeneousmixture,easycauseroughburning.DieselHCCIcombustionisalsooccursinmanypoints,thereisnoobviousflame,combustionreactionisrapid,thecombustiontemperatureislowandthedistributionisuniform,onlylowproductionofNOxandPM,withhighthermalefficiencyatlowloads.Butthetradi

5、tionaldieselenginewithhighpressureinjectionformingnonuniformlymixedgasdiffusioncombustion,gasmixtureandtemperaturedistributionisveryuneven,inthediffusionflameshell7coffeeChenshovelstudentNOx,internalhighstainlesshypoxiahouseholdsstudentPmorethan3,theinfluencefactorsofdieselHOClcombustionmode3,effe

6、ctof3kindsofmixedgas!TheformationofdieselHCCIcombustion.HomogeneousmixtureformationistoachievethefirststepofHCCIcombustioncontrol,includingtheinternationaluseofdieselhomogeneouspremixedgas:inletcylinderexternalpremixed,earlyincylinderinjectionandlateinjection.CylinderpremixedHCCIThatis,thedieselsp

7、raypeopleintakepipeintheintakestroke,andairmixtureformationofpremixedgas.Usingaportinjection,tostrengthenthemixtureformationbyintakeswirl,istoimprovethemixtureuniformityofarelativelysimplemethod.3,1,2earlyincylin

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