Advancements in catalytic reforming have demonstrated the ability to generate syngas (a mixture of CO and hydrogen) from a single hydrocarbon stream. This syngas mixture can then be used to replace diesel fuel and enable dual-fuel combustion strategies. The role of port-fuel injected syngas, composed of equal parts hydrogen and carbon monoxide by volume, was investigated experimentally for soot reduction benefits under diesel pilot ignition and reactivity controlled compression ignition strategies. Particle size distribution measurements were made with a scanning mobility particle sizer and condensation particle counter for different levels of syngas substitution. To explain the experimental results, computational fluid dynamics simulations utilizing a detailed stochastic soot model were used to validate and initialize additional simulations that isolate mixing and chemistry effects. Based on these simulations, the influence of adding syngas on soot particle size and quantity is discussed.
HanDIckesAMBohacSVHuangZAssanisDN.Premixed low-temperature combustion of blends of diesel and gasoline in a high speed compression ignition engine. P Combust Inst2011; 33: 3039–3046.
2.
DecJEYangYDronniouN.Boosted HCCI-controlling pressure-rise rates for performance improvements using partial fuel stratification with conventional gasoline. SAE Int J Eng2011; 4: 1169–1189.
3.
HwangWDecJSjobergM.Spectroscopic and chemical-kinetic analysis of the phases of HCCI autoignition and combustion for single-and two-stage ignition fuels. Combust Flame2008; 154: 387–409.
4.
WissinkMReitzR.Exploring the role of reactivity gradients in direct dual fuel stratification. SAE Int J Eng2016; 9: 1036–1048.
5.
KlosDKokjohnSL.Investigation of the sources of combustion instability in low-temperature combustion engines using response surface models. Int J Engine Res2015; 16: 419–440.
6.
ChuahyFDFKokjohnSL. High efficiency dual-fuel combustion through thermochemical recovery and diesel reforming. Appl Energ2017; 195: 503–522.
7.
ChuahyFDKokjohnSL.Single fuel RCCI combustion using reformed fuel. In: Proceedings of the 10th US national combustion meeting, College Park, MD, 23–24 April 2017. The Combustion Institute.
8.
ChuahyFDFOlkJKokjohnS.Reformed fuel substitution for transient peak soot reduction. SAE technical paper 2018-01-0267, 2018.
9.
KittelsonDBWattsWFJohnsonJP.Nanoparticle emissions on Minnesota highway. Atmos Environ2004; 38: 9–19.
10.
ZhangY.Comparisons of particulate size distributions from multiple combustion strategies. PhD Thesis, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI, 2017.
11.
BalthasarMKraftM.A stochastic approach to calculate the particle size distribution function of soot particles in laminar premixed flames. Combust Flame2003; 133: 289–298.
12.
CelnikMPattersonRKraftMWagnerW.Coupling a stochastic soot population balance to gas-phase chemistry using operator splitting. Combust Flame2007; 148: 158–176.
13.
PattersonRIASinghJBalthasarMKraftMNorrisJR.The linear process deferment algorithm: a new technique for solving population balance equations. SIAM J Sci Comput2006; 28: 303–320.
CalcoteHFManosDM.Effect of molecular structure on incipient soot formation. Combust Flame1983; 49: 289–304.
18.
FrenklachMWangH.Detailed mechanism and modeling of soot particle formation. In: BockhornH (ed.) Soot formation in combustion. Berlin; Heidelberg: Springer, 1994, pp.165–192.
19.
CarrMACatonPAHamiltonLJCowartJSMehlMPitzWJ. An experimental and modeling-based study into the ignition delay characteristics of diesel surrogate binary blend fuels. J Eng Gas Turbines Power2012; 134: 072803.
20.
AppelJBockhornHFrenklachM. Kinetic modeling of soot formation with detailed chemistry and physics: laminar premixed flames of C2 hydrocarbons. Combust Flame2000; 121: 122–136.
21.
RenSKokjohnSLWangZLiuHWangBWangJ.A multi-component wide distillation fuel (covering gasoline, jet fuel and diesel fuel) mechanism for combustion and PAH prediction. Fuel2017; 208: 447–468.
KeeRJRupleyFMMillerJAColtrinMEGrcarJFMeeksE, et al. CHEMKIN: a software package for the analysis of gas-phase chemical and plasma kinetic (Release 3.6), vol. 20. San Diego, CA: Reaction Design, 2000, https://www3.nd.edu/∼powers/ame.60636/chemkin2000.pdf
RaYReitzRD.The application of a multicomponent droplet vaporization model to gasoline direct injection engines. Int J Engine Res2003; 4: 193–218.
26.
AbaniNKokjohnSParkSWBerginMMunnannurANingW, et al. An improved spray model for reducing numerical parameter dependencies in diesel engine CFD simulations. SAE technical paper 2008-01-0970, 2008.
27.
BealeJCReitzRD.Modeling spray atomization with the Kelvin-Helmholtz/Rayleigh-Taylor hybrid model. Atomization Spray1999; 9: 623–650.
28.
HanZReitzRD.Turbulence modeling of internal combustion engines using RNG κ-ε models. Combust Sci Technol1995; 106: 267–295.
29.
MunnannurAReitzRD.A new predictive model for fragmenting and non-fragmenting binary droplet collisions. Int J Multiphas Flow2007; 33: 873–896.
30.
PeriniFGalliganiEReitzRD.An analytical Jacobian approach to sparse reaction kinetics for computationally efficient combustion modeling with large reaction mechanisms. Energy & Fuels2012; 26: 4804–4822.
31.
LiuFDaunKJSnellingDRSmallwoodGJ.Heat conduction from a spherical nano-particle: status of modeling heat conduction in laser-induced incandescence. Appl Phys B2006; 83: 355–382.
32.
StricklandTKokjohnS.Detailed soot modeling of mixing controlled compression ignition engines. In: Proceedings of the 11th US national combustion meeting, Pasadena, CA, 24–27 March, 2019.
33.
TesnerPA.Formation of dispersed carbon by thermal decomposition of hydrocarbons. Sym (Int) Combust1958; 7: 546–553.
34.
TesnerPARobinovitchHJRafalkesIS.The formation of dispersed carbon in hydrocarbon diffusion flames. Sym (Int) Combust1961; 8: 801–806.
35.
DeardenPLongR.Soot formation in ethylene and propane diffusion flames. J Appl Chem1968; 18: 243–251.
36.
GuoHLiuFSmallwoodGJGulderL.Numerical study on the influence of hydrogen addition on soot formation in a laminar ethylene-air diffusion flame. Combust Flame2006; 145: 324–338.
37.
WeiMLiuJGuoGLiS.The effects of hydrogen addition on soot particle size distribution functions in laminar premixed flame. Int J Hydrogen Energ2016; 41: 6162–6169.
38.
BockhornH.Soot formation in combustion: mechanisms and models. Berlin; Heidelberg: Springer, 2013.
39.
ChuahyFDF.A pathway to higher efficiency IC engines through thermochemical recovery and fuel reforming. PhD Thesis, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, MI, 2018.
40.
KavuriCPazJKokjohnSL.A comparison of reactivity controlled compression ignition (RCCI) and gasoline compression ignition (GCI) strategies at high load, low speed conditions. Energ Convers Manage2016; 127: 324–341.
41.
KookSZhangRChanQAizawaTKondoKPickettL, et al. Automated detection of primary particles from transmission electron microscope (TEM) images of soot aggregates in diesel engine environments. SAE Int J Eng2016; 9(1): 279–296.
42.
MosbachSCelnikMSRajAKraftMZhangHRKuboSKimK-O.Towards a detailed soot model for internal combustion engines. Combust Flame2009; 156: 1156–1165.
43.
MorganNKraftMBalthasarMWongDFrenklachMMitchellP.Numerical simulations of soot aggregation in premixed laminar flames. P Combust Inst2007; 31: 693–700.
44.
LallAAFriedlanderSK.On-line measurement of ultrafine aggregate surface area and volume distributions by electrical mobility analysis: I. Theoretical analysis. J Aerosol Sci2006; 37: 260–271.
45.
ParkKCaoFKittelsonDBMcMurryPH.Relationship between particle mass and mobility for diesel exhaust particles. Environ Sci Technol2003; 37: 577–583.
46.
RogakSNFlaganRC.Stokes drag on self-similar clusters of spheres. J Colloid Interf Sci1990; 134: 206–218.
47.
KennedyIM.Models of soot formation and oxidation. Prog Energ Combust1997; 23: 95–132.
48.
WangHFrenklachM.A detailed kinetic modeling study of aromatics formation in laminar premixed acetylene and ethylene flames. Combust Flame1997; 110(1): 173–221.
