简介：Theblue-greenemittingEu2+andNd3+dopedpolycrystallinebariumaluminate(BaAl2O4:Eu2+,Nd3+)phosphor,waspreparedbyasolution-combustionmethodat500oCwithoutapost-annealingprocess.Thecharacteristicvariationinthestructuralandluminescencepropertiesoftheas-preparedsampleswasevaluatedwithregardstoachangeintheBa/Almolarratiofrom0.1:1to1.4:1.Themorphologiesandthephasestructuresoftheproductswerecharacterizedbyscanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),X-raydiffraction(XRD)andX-rayphotoelectronspectroscopy(XPS),whiletheopticalpropertieswereinvestigatedusingultra-violet(UV)andphotoluminescence(PL)spectroscopy,respectively.TheXRDandTEMresultsrevealedthattheaveragecrystallitesizeoftheBaAl2O4:Eu2+,Nd3+phosphorwasabout70nm.Thebroad-bandUV-excitedluminescenceofthephosphorswasobservedatλmax=500nmduetotransitionsfromthe4f65d1tothe4f7configurationoftheEu2+ion.ThePLresultsindicatedthatthemainpeaksintheemissionandexcitationspectrumofphosphorparticlesslightlyshiftedtotheshortwavelengthduetothechangesinthecrystalfieldduetothestructurechangescausedbythevariationinthequantityoftheBaionsinthehostlattice.

简介：Anewgenerationconicalspraysystemforconventionaldieselenginesorpremixedcombustiondieselenginesisintroduced.Bymeansoforientedimpingementmethod,flexiblespraypenetrationindesignisrealized.High-speedphotographwasusedtoinvestigatethespatialdistributioncharacteristicsofthenewsprayforcasesofdifferentimpingementanglesandneedlevalveopeningpressures.Theresultsshowthat,byapplyingsprayimpingementorientation,fueljetsspreadalongtheconesurfaceasshapeofsectors,sothedispersionofjetsisincreasedobviously.Changingonimpingementangleleadstovariationofpenetration,whichiscriticalinhomogeneousmixturepreparation.Duetotheflexibilityofspraypenetrationindesign,thesprayimpingementonlinerisavoidedinagreatextent.Theresultsalsoindicatethathigherneedlevalveopeningpressureresultsinlongerpenetrationandlargersprayangleafterimpingement.Combustioncharacteristicsoftheimpingedconicalspraywerestudiedinthe1135typedieselengine.ThenewimpingedconicalspraysystemworksmoothlyinfullloadrangewithbetterfueleconomyandloweremissionsofNOxandsootthantheoriginaltestengine.

简介：RecentlyalowcostcookingdevicefordevelopingandemergingcountrieswasdevelopedatKITincooperationwiththecompanyBoschundSiemensHausgerteGmbH.Afterconstructinganinnovativebasicdesignfurtherdevelopmentwasrequired.Numericalinvestigationswereconductedinordertoinvestigatetheflowinsidethecombustionchamberofthestoveundervariationofdifferentgeometricalparameters.Beyondtheperformanceimprovementafurtherreasonoftheinvestigationswastoratetheeffectsofmanufacturingtoleranceproblems.InthispaperthenumericalinvestigationofaplantoilstovebymeansofRANSsimulationwillbepresented.Inordertoreducethecomputationalcostsdifferentmodelreductionstepswerenecessary.Thesimulationresultsofthebasicconfigurationcompareverywellwithexperimentalmeasurementsandproblematicbehaviorsoftheactualstovedesigncouldbeexplainedbytheinvestigation.

简介：汽油的清洁与它的部件有关，properties.All广告汽油在引擎的注射者，吸入阀门和燃烧房间上建立存款，罐头它显著地降低引擎表演和影响用尽煤气的emissions.In这研究，吸入阀门存款(IVD)和燃烧房间存款(电荷耦合器件)从包含aromatics的21v-42v的燃料的燃烧生产了，石蜡的8v-31v被学习了使用de的福特引擎测试，和特征

简介：热分解和波兰的沥青的煤的oxy燃料燃烧特征用非等温的thermogravimetric分析被学习。热分解测试证明集体损失侧面是几乎类似的直到870??郱

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简介：Combustionreactionwelding,onepromisingmethodtoweldceramicsandmetals,wasusedtoweldTiB2andMo.TheresultsshowedthatthereactedproductsthroughcombustionreactionwereTiB2andMoBwhentheMocontentsinreactantswere20wtpctand40wtpctwhiletherewasMobesidesMoBandTiB2whentherewere60wtpctand80wtpctMoinreactants.Diffusionofelementsoccurredattheinterfacesofthetwosubstrates.Theinterfacesbetweenthereactedandthetwosubstrateswereindistinctafterbeingwelded.Theweldingtemperaturestronglyaffectedpropertiesofthesamples.Thevalueofbendingstrengthofthesamplewith80wtpctMoinreactantweldedat1500℃wasthehighest,368.52MPa.Thehighestvalueofshearstrengthamongallthesampleswasthatoftheonewith40wtpctMoinreactantweldedat1500℃,50.97MPa.

简介：Thispaperdescribestheeffectsofnon-equilibriumairplasmageneratedbyadielectricbarrierdischarge（DBD）onthecombustionoflowheatingvaluefuels.TheexperimentalresultsindicatethatadditionofaverysmallamountofenergytotheairflowintheformofDBDsignificantlyimprovestheflamestability.Moreover,maincombustioncharacteristicssuchasflamepropagationspeed,combustionintensityandleanblow-offlimitsarealsoenhancedbytheeffectofplasma.SomeactiveradicalssuchasexcitedOatomandexcitedN2moleculeareobservedbyspectrographinthedischargearea.BasedontheresultsofnumericalinvestigationwecanconcludethattheseactiveradicalsgeneratedindischargeareacanacceleratetheproductionrateofactiveOHradicalwhichplaysakeyroleintheoxidationprocessoflowheatingvaluefuel,andthusthewholecombustionprocessisaccelerated.

简介：ThemetaloxidesCuMnCeandCeYwashcoatsoncordieritewerepreparedusinganimpregnationmethod,andthenusedassupportfortheactivePtcomponenttopreparethePt/CuMnCeandPt/CeYmonolithiccatalystsforthedeepoxidationofVOCs.IncomparisonwiththePt/CeY,CuMnCe,andCeYmonolithiccatalysts,thePt/CuMnCemonolithiccatalystshowsanexcellentperformancefortoluene,ethylacetate,andn-hexaneoxidationandtheT90%islowto216,200and260℃,respectively.TheactivecomponentsPt/PtOandCuMnCeresultinabettersynergeticinteraction,whichpromotethecatalystreducibility,increasetheoxygenmobility,andenhancetheadsorptionandactivationoforganicmolecules.

简介：Leanpremixedcombustion,whichallowsforreducingtheproductionofthermalNOx,ispronetocombustioninstabilities.Thereisanextensiveresearchtodevelopareducedphysicalmodel,whichallows-withouttime-consumingmeasurements-tocalculatetheresonancecharacteristicsofacombustionsystemconsistingofHelmholtzresonatortypecomponents(burnerplenum,combustionchamber).FortheformulationofthismodelnumericalinvestigationsbymeansofcompressibleLargeEddySimulation(LES)werecarriedout.Intheseinvestigationstheflowinthecombustionchamberisisotherm,non-reactingandexcitedwithasinusoidalmassflowrate.Firstlyacombustionchamberasasingleresonatorsubsequentlyacoupledsystemofaburnerplenumandacombustionchamberwereinvestigated.Inthispapertheresultsofadditionalinvestigationsofthesingleresonatorarepresented.Theflowinthecombustionchamberwasinvestigatedwithoutexcitationattheinlet.Itwasdetected,thatthemassflowrateattheoutletcrosssectionispulsatingoncetheflowinthechamberisturbulent.ThefastFouriertransformofthesignalshowedthatthedominantmodeisattheresonancefrequencyofthecombustionchamber.Thisresultshedslightonaveryimportantsourceofself-excitedcombustioninstabilities.FurthermoretheLEScanprovidenotonlythedampingratiofortheanalyticalmodelbuttheeigenfrequencyoftheresonatoralso.

简介：Thisstudycomparestheregenerativeradiant-tubeheaterwiththetraditionalradiant-tubeheater,showingtheregenerativeradiant-tubeheatershavemanyadvantagesinfuelconsumption.Basedontheexperienceofchangingaheatingsystemwithtraditionalradiant-tubeburnerstoaheatingsystemwithregenerativecombustion,propositionsaregivenforthecombustioncontrolsystem,pilotburner,flamedetectionandfortroublepreventioninrebuildingthecontinuousannealingproductionline(CAPL)andthecontinuousgalvanizingline(CGL).

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简介：Themajoraimscombustionengineersallovertheworldarestrivingatareconservationofenergyandallevia-tionofenvironmentalpollution,forwhichthemonitoringandcontrolofthefurnaceprocessareofprimeimportancetoattainanoptimizedconditionofcombustion.Oxygencontentinfluegasisgenerallyusedasanindicatorofwhethertherightamountofcombustionairissupplied.However,itcannotdirectlyreflectthedegreeofperfectionofthecombustionprocesstakingplaceinthefurnace.OntheotherhandCOisaproductofchemicalreactionwhichdirectlyreflectsthe

简介：一条全球存在定理为一个起始边界的值问题被建立，与时间依赖者边界数据，在脉搏燃烧的一个lumped参数模型产生；在问题的模型产生一个非线性的混合夸张寓言的系统。用以前为联系线性问题建立的结果，固定的点争论被采用与人工的粘性为非线性的问题的一个调整版本证明存在本地。适当-priori估计然后被导出它暗示本地存在结果能为调整问题被扩大到一条全球存在定理。最后，priori估计的一个不同集合被产生当人工的粘性参数收敛到零，它允许拿限制；调整问题的相应答案然后被证明收敛到原来的、非线性的、夸张寓言的系统的起始边界的价值问题的唯一的答案。

简介：Anaccurateandcompletegeometricmodelwasconstructedtosimulatethecombustion,flowandtemperatureenvironmentintheradiantsectionofthesteamcrackingfurnace.Simulationofflowandradiationstatushasutilizedthestandardk-εmodelandP1model.Thefinite-rate/eddy-dissipation(finite-rate/ED)combustionmodelandnon-premixedcombustionmodelwerebothusedtosimulateaccuratelythecombustionandtheoperationstatusofthesteamcrackingfurnace.Threedifferentsurfacesofthesteamcrackingfurnacewereobtainedfromthesimulation,namely:thefluegastemperaturefieldoftheentrancesurfaceinlongflameburners,thecentralsurfacelocationoftubes,andthecrossoversectionsurface.Detailedinformationonthefluegastemperatureandthemassconcentrationfractionofthesedifferentsurfacesinthesteamcrackingfurnacecanalsobeobtainedbythesimulation.Thispaperanalyzedandcomparedthesimulationresultswiththetwocombustionmodels,estimatedtheoperationstatusofthesteamcrackingfurnace,andreportedthatthefinite-rate/EDmodelisappropriatetosimulatethesteamcrackingfurnacebycomparingkeysimulationdatawithactualtestdata.Thisworkhasalsoprovidedatheoreticalbasisforsimulatingandoperatingthesteamcrackingfurnace.

简介：Anewlydesignedstrutisproposedinthispaperforfuelinjectionandflameholdinginaliquid-kerosene-fueledsupersoniccombustor.Thethicknessofthestrutis8mmandthefrontblockageisabout8%.Thecharacteristicofthisstrutisthatextraoxygencanbeinjectedthroughasetoforificesatthebackofthestrut,whichcanchangethelocalflowfieldstructureandER(EquivalenceRatio).Basedontheabovementionedstrut,astablelocalflameisgeneratedatthebackofthestrutandthemaincombustioncanbeorganizedaroundthislocalfire.Numericalsimulationisconductedtocomparethelocalflowfielddistributionatthebackofthestrutwith/withoutextraoxygeninjection.Experimentsareconductedtotestthecombustioncharacteristicsbasedonthisfuelinjectionandflameholdingstrategy.Thetemperaturedistributionwhichcanreflectthelocalflamecharacteristichasbeenmeasuredintheexperimentsconductedundercoldincomingsupersonicairflowcondition.Inaddition,theoverallcombustionperformanceinafull-scalesupersoniccombustorhasbeenevaluatedintheexperimentsconductedunderhotincomingsupersonicairflowcondition.Resultsshowthatthisstrutstrategyisverypromisingsinceitcanorganizestablesupersoniccombustionatthecenterofthecombustorwithoutanycavityorrearwardfacingstep.Besidesthat,evenwiththe8mmthickstrut,thecombustioncanbestableinawiderangeofERfrom0.25-1byusingliquidroom-temperaturekerosene.

简介：Thecombustionperformanceoftheboilerlargelydependsonthecoaltype.Lotsofexperimentalresearchshowsthatdifferentfuelshavedifferentcombustioncharacteristics.ItisobviousthatfuelwillchangethewholeoperatingperformanceofCirculatingFluidizedBedCombustion(CFBC).Weknoweveninapilot-scalerunningboiler,themeasurementofsomeparametersisdifficultandcostly.Therefore,wedevelopedthewayofsimulationtoevaluatethecombustionperformanceofChinesecoalsinCFB,Thesimulationresultsshowthat,differentcoalswillresultindifferentcoalparticlediameterandcominutiondependingontheirmineralcomponentandthechangewillaffectthedistributionofashinCFBCsystem.Inaword.thecomputationalresultsareinaccordancewithexperimentalresultsqualitativelybuttherearesomedifferencesquantitatively.

简介：Combustioncharacteristicsofmethanejetflamesinanindustrialburnerworkinginhightemperaturecombustionregimewereinvestigatedexperimentallyandnumericallytoclarifytheeffectsofswirlinghightemperatureaironcombustion.Speziale-Sarkar-Gatski(SSG)Reynoldsstressmodel,Eddy-DissipationModel(EDM),DiscreteOrdinatesMethod(DTM)combinedwithWeighted-Sum-of-GreyGasesModel(WSGG)wereemployedforthenumericalsimulation.BothThermal-NOandPrompt-NOmechanismwereconsideredtoevaluatetheNOformation.Temperaturedistribution,NOemissionsbyexperimentandcomputationinswirlingandnon-swirlingpatternsshowcombustioncharacteristicsofmethanejetflamesaretotallydifferent.Non-swirlinghightemperatureairmadehighNOformationwhilesignificantNOprohibitionwereachievedbyswirlinghightemperatureair.Furthermore,velocityfields,dimensionlessmajorspeciesmolefractiondistributionsandThermal-NOmolarreactionrateprofilesbycomputationinterpretaninnerexhaustgasrecirculationformedinthecombustionzoneinswirlingcase.

简介：为尖晶石铁酸盐nanomaterial合成的大音阶的第五音胶化汽车燃烧方法的最近的开发和趋势简短被讨论并且极其分析了。能被用于合成过程的更好的理解和微观结构的控制和尖晶石铁酸盐nanopowder产品的性质的反应的各种各样的参数的分析是这篇评论文章的主要目的。特殊注意对粒子尺寸和阶段纯净的变化被给予。为这些目的在complexant，氧平衡和燃烧过程化学药品添加剂，以及加热机制和空气之间的关联，被建立。这些结果从申请的立场是相关的并且铁酸盐处理。