The fuel films that can be generated during the injection process in gasoline direct injection engines are the most important factor in carbon particle mass and number. They also have an influence on combustion chamber and injector tip deposits. A model experiment was set up to study a liquid film, its evaporation, and combustion with soot generation on a metal plate in realistic engine conditions. The experiment was conducted in a dedicated constant volume vessel. A liquid fuel injection system (with injection pressures up to 100 bar) directs the spray onto a plate with a controlled temperature in the range of 80 °C–200 °C. The resulting liquid film and vaporization process were studied when subjected to interaction with a laminar spherical flame. A blend of four components was used as a gasoline surrogate. The liquid film spreading, thickness, and evaporation rates were initially measured in ambient conditions. Mie scattering and schlieren measurements in the chamber conditions returned a qualitative correlation of the vaporized area with the surface temperature. Fluorescence of the light and heavy fuel components was used to quantify the influence of the vaporization process on soot production. Simultaneous measurements of natural luminosity and KL factor were analyzed to understand the process of soot production. The results showed a critical wall temperature of 120 °C at which the maximum quantity of soot is generated, which can be due to the quantity and composition of fuel film in interaction with the entrainment flows generated during combustion.
MontanaroAAlloccaLLazzaroMMeccarielloG. Vapor and liquid phases of the ECN spray G impacting on a flat wall at engine-like conditions. SAE technical paper, 2016-01-2199, 2016.
2.
MontanaroAAlloccaLRoccoVCostaMPiazzulloD. Transient heat transfer effects on a gasoline spray impact against hot surfaces: experimental and numerical study. SAE technical paper, 2017-24-0107, 2017.
MontanaroAAlloccaLLazzaroMMeccarielloG. Impinging jets of fuel on a heated surface: effects of wall temperature and injection conditions. SAE technical paper, 2016-01-0863, 2016.
5.
MiyashitaKTsukamotoTFukudaYKondoKAizawaT. High-speed UV and visible laser shadowgraphy of GDI in-cylinder pool fire. SAE technical paper, 2016-01-2165, 2016.
6.
StevensESteeperR. Piston wetting in an optical DISI engine: fuel films, pool fires, and soot generation. SAE technical paper, 2001-01-1203, 2001.
7.
DrakeMFanslerTSolomonASzekelyGA. Piston fuel films as a source of smoke and hydrocarbon emissions from a wall-controlled spark-ignited direct-injection engine. SAE technical paper, 2003-01-0547, 2003.
8.
AlloccaLLazzaroMMeccarielloGMontanaroA. Schlieren visualization of a GDI spray impacting on a heated wall: non-vaporizing and vaporizing evolutions. Energy2016; 108: 93–98.
9.
MurthyBSNatarajanRRamalingamKK. Vapourization of fuel drops on a hot plate. SAE technical paper, 1976-02-01, 1976.
10.
MillsAASharrockNF. Rate of evaporation of n-alcohols from a hot surface: Nukiyama and Leidenfrost temperatures. Eur J Phys1986; 7: 52–54.
11.
FardadDLadommatosN. Evaporation of hydrocarbon compounds, including gasoline and diesel fuel, on heated metal surfaces. Proc IMechE Part D: J Automobile Engineering1999; 213: 625–645.
12.
StanglmaierRHRobertsCEMosesCA. Vaporization of individual fuel drops on a heated surface: a study of fuel-wall interactions within direct-injected gasoline (DIG) engines. SAE technical paper, 2002-01-0838.
13.
HabchiC. A comprehensive model for liquid film boiling in internal combustion engines. Oil Gas Sci Technol2010; 65: 331–343.
14.
HenkelSBeyrauFHardalupasYTaylorAM. Novel method for the measurement of liquid film thickness during fuel spray impingement on surfaces. Opt Express2016; 24(3): 2542–2561.
15.
SchulzFBeyrauF. The effect of operating parameters on the formation of fuel wall films as a basis for the reduction of engine particulate emissions. Fuel2019; 238: 375–384.
16.
LuoHNishidaKUchitomiSOgataYZhangWFujikawaT. Effect of temperature on fuel adhesion under spray-wall impingement condition. Fuel2018; 234: 56–65.
17.
YoonJKMyongKJSendaJFujimotoH. Analysis of spatial vapor-phase distribution using the LIF method on multi-component fuel. J Mech Sci Technol2009; 23: 2565–2573.
18.
ItaniLMBruneauxGDi LellaASchulzC. Two-tracer LIF imaging of preferential evaporation of multi-component gasoline fuel sprays under engine conditions. Proc Combust Inst2015; 35: 2915–2922.
19.
SendaJFujimotoH. Multicomponent fuel consideration for spray evaporation field and spray-wall interaction. SAE technical paper, 2001-01-1071, 2001.
20.
BardiMDi LellaABruneauxG. A novel approach for quantitative measurements of preferential evaporation of fuel by means of two-tracer laser induced fluorescence. Fuel2019; 239: 521–533.
21.
DesoutterGCuenotBHabchiCPoinsotT. Interaction of a premixed flame with a liquid fuel film on a wall. Proc Combust Inst2005; 30: 259–265.
22.
TaoMGeHVanDerWegeBZhaoP. Fuel wall film effects on premixed flame propagation, quenching and emission. Int J Engine Res. Epub ahead of print 12 September 2018. DOI: 10.1177/1468087418799565.
23.
KettererJEChengWK. On the nature of particulate emissions from DISI engines at cold-fast-idle. SAE technical paper, 2014-01-1368, 2014.
24.
OhCChengWK. Assessment of gasoline direct injection engine cold start particulate emission sources. SAE technical paper, 2017-01-0795, 2017.
25.
ChenBFengLWangYMaTLiuHGengCYaoM. Spray and flame characteristics of wall-impinging diesel fuel spray at different wall temperatures and ambient pressures in a constant volume combustion vessel. Fuel2019; 235: 416–425.
26.
LiKNishidaKOgataYShiB. Effect of flat-wall impingement on diesel spray combustion. Proc IMechE Part D: J Automobile Engineering2015; 229: 535–549.
27.
LiKIdoMOgataYNishidaKShiBShimoD. Effect of spray/wall interaction on diesel combustion and soot formation in two-dimensional piston cavity. SAE technical paper, 2013-32-9021, 2013.
28.
RoqueAFoucherFImoehlWHelieJ. Generation and oxidation of soot due to fuel films utilizing high speed visualization techniques. SAE technical paper, 2019-01-0251, 2019.
SaggeseCSinghAVXueXChuCKholghyMRZhangT, et al. The distillation curve and sooting propensity of a typical jet fuel. Fuel2019; 235: 350–362.
31.
KobayashiYAraiM. Characteristics of PM exhausted from pool diffusion flame with gasoline and surrogate gasoline fuels. SAE technical paper, 2015-01-2024, 2015.
32.
SlavchovRIMosbachSKraftMPearsonRFilipSV. An adsorption-precipitation model for the formation of injector external deposits in internal combustion engines. Appl Energ2018; 228: 1423–1438.
33.
LindTRobertsGEagleWRousselleCAnderssonOMusculusMPB. Mechanisms of post-injection soot-reduction revealed by visible and diffuse-background-illumination soot extinction imaging. SAE technical paper, 2018, 2018-01-0232.
34.
LamielQLamarqueNHélieJLegendreD. Spreading model for wall films generated by high-pressure sprays. In: Proceedings ILASS–Europe 2017, 28th conference on liquid atomization and spray systems, Valencia, 6–8 September 2017, pp. 6–8. Valencia: Universitat Politècnica de València.
35.
GalmicheBHalterFFoucherF. Effects of high pressure, high temperature and dilution on laminar burning velocities and Markstein lengths of iso-octane/air mixtures. Combust Flame2012; 159: 3286–3299.
36.
EndouardCHalterFChauveauCFoucherF. Effects of CO2, H2O, and exhaust gas recirculation dilution on laminar burning velocities and Markstein lengths of iso-octane/air mixtures. Combust Sci Technol2016; 188: 516–528.
37.
PolingBEPrausnitzJMO’ConnellJP. The properties of gases and liquids. 5th ed.New York: McGraw-Hill, 2001.
38.
ChoatePJEdwardsJC. Relationship between combustion chamber deposits, fuel composition, and combustion chamber deposit structure. SAE technical paper, 932812, 1993.
39.
ChengS. The impacts of engine operating conditions and fuel compositions on the formation of combustion chamber deposits. SAE technical paper, 2000-01-2025, 2000.
40.
SandquistHDenbrattIOwrangFOlssonJ. Influence of fuel parameters on deposit formation and emissions in a direct injection stratified charge SI engine. SAE technical paper, 2001-01-2028, 2001.
41.
FatouraieMFrommherzMMosburgerMChapmanELiSMcCormickRFioroniG. Investigation of the impact of fuel properties on particulate number emission of a modern gasoline direct injection engine. SAE technical paper, 2018-01-0358, 2018.
42.
MaligneDBruneauxG. Time-resolved fuel film thickness measurement for direct injection SI engines using refractive index matching. SAE technical paper, 2011-01-1215, 2011.
43.
SchindelinJArganda-CarrerasIFriseEKaynigVLongairMPietzschT, et al. Fiji: an open-source platform for biological-image analysis. Nat Methods2012; 9: 676–682.
44.
MontanaroAAlloccaLMeccarielloGLazzaroM. Schlieren and Mie scattering imaging system to evaluate liquid and vapor contours of a gasoline spray impacting on a heated wall. SAE technical paper, 2015-24-2473, 2015.
45.
XiaoDLiXHungDLSXuM. Characteristics of impinging spray and corresponding fuel film under different injection and ambient pressure. SAE technical paper, 2019-01-0277, 2019.
46.
MaXHeXWangJShuaiS-J. Design and optimization of multi-component fuel for fuel concentration measurement by using tracer PLIF in SI engine. SAE technical paper, 2010-01-0344, 2010.
47.
MaXHeXWangJShuaiS. Co-evaporative multi-component fuel design for in-cylinder PLIF measurement and application in gasoline direct injection research. Appl Energ2011; 88: 2617–2627.
48.
BoggavarapuPRavikrishnaRV. Quantitative vapour concentration measurements in n-dodecane and n-hexadecane sprays. Exp Therm Fluid Sci2019; 102: 397–405.
49.
KaiserSALongMB. Quantitative planar laser-induced fluorescence of naphthalenes as fuel tracers. Proc Combust Inst2005; 30: 1555–1563.
50.
BenzlerTDreierTSchulzC. UV absorption and fluorescence properties of gas-phase p-difluorobenzene. Appl Phys B2017; 123: 1–10.
51.
LindSRetzerUWillSZiangL. Investigation of mixture formation in a diesel spray by tracer-based laser-induced fluorescence using 1-methylnaphthalene. Proc Combust Inst2015; 36: 4497–4504.
52.
KranzPKaiserS. LIF-based imaging of preferential evaporation of a multi-component gasoline surrogate in a direct-injection engine. Proc Combust Inst2019; 37: 1365–1372.
53.
CevizMAKaymazI. Temperature and air-fuel ratio dependent specific heat ratio functions for lean burned and unburned mixture. Energ Convers Manage2005; 46: 2387–2404.
54.
SchulzFSamenfinkWSchmidtJBeyrauF. Systematic LIF fuel wall film investigation. Fuel2016; 172: 284–292.
55.
MouvanalSLamielQLamarqueNHelieJBurkhardtABakshiSChatterjeeD. Evaporation of thin liquid film of single and multi-component hydrocarbon fuel from a hot plate. Int J Heat Mass Tran2019; 141: 379–389.
56.
LamielQ. On the spreading of high-pressure spray-generated liquid wall films. Phys Rev Fluids (in press).
57.
KawanoDSendaJWadaYFujimotoHGotoYOdakaM, et al. Numerical simulation of multicomponent fuel spray. SAE technical paper, 2003-01-1838, 2003.
58.
LuoHNishidaKOgataY. Fuel adhesion characteristics under non-evaporation and evaporation conditions: part 2—effect of ambient pressure. Fuel2019; 251: 98–105.
59.
MetghalchiMKeckJC. Burning velocities of mixtures of air with methanol, isooctane, and indolene at high pressure and temperature. Combust Flame1982; 48: 191–210.
60.
SongJKimTJangJParkS. Effects of the injection strategy on the mixture formation and combustion characteristics in a DISI (direct injection spark ignition) optical engine. Energy2015; 93: 1758–1768.
61.
KimKKimDJungYBaeC. Spray and combustion characteristics of gasoline and diesel in a direct injection compression ignition engine. Fuel2013; 109: 616–626.
62.
LiKDongPMatsuoTShiBOgataYNishidaK. Characteristics of diesel spray flame under flat wall impinging condition—LAS, OH* chemiluminescence and two color pyrometry results. SAE technical paper, 2014-01-2636, 2014.
63.
LindTRobertsGEagleWRousselleCAnderssonOMusculusMPB. Mechanisms of post-injection soot-reduction revealed by visible and diffused back-illumination soot extinction imaging. SAE technical paper, 2018-01-0232, 2018.
64.
JiaoQReitzRD. Modeling soot emissions from wall films in a direct-injection spark-ignition engine. Int J Engine Res2015; 16: 994–1013.
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