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Analysis of Unburned Hydrocarbon Generated from Wall under Lean Combustion
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Combustion of a lean air-fuel mixture diluted with a large amount of air or Exhaust Gas Recirculation (EGR) gas is one of the important technologies that can reduce thermal NOx and improve gasoline engine fuel economy by reducing cooling loss. On the other hand, lean combustion increases unburned Hydro Carbon (HC) and unburned loss compared to stoichiometric combustion. This is because lean combustion reduces the burning rate of the air-fuel mixture and forms a thick quenching layer near the wall surface. In this study, the relationship between the thickness of the unburned HC and the excess air ratio is analyzed using Laser Induced Fluorescence (LIF) method and Computational Fluid Dynamic (CFD) of combustion.
The HC distribution near the engine liner when the excess air ratio is increased is investigated by LIF. As a result, it is found that the quenching distance of the flame in the cylinder is larger for lean conditions than the general single-wall quenching relationship.
Two turbulent models, RANS and LES are used for CFD. RANS using a normal wall function cannot express the distribution of unburned HC as in the experimental results, because detailed mesh makes [Y +] too small and the turbulent behavior near the wall is not analyzed correctly.
LES without using wall function can give near-wall behavior that is similar to the experimental results. By analyzing quantities of state calculated by LES, it is found that turbulence affects the thermal diffusion from the flame when the excess air ratio increases, and the unburned HC region expands. A revised relationship for a single-wall quenching considering the effect of turbulence on the thermal diffusion from the flame is proposed, and the increase of the quenching distance for lean conditions can be explained.
CitationSakai, H., Sato, S., Mori, S., Nogawa, S. et al., "Analysis of Unburned Hydrocarbon Generated from Wall under Lean Combustion," SAE Technical Paper 2020-01-0295, 2020, https://doi.org/10.4271/2020-01-0295.
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- Heywood, M.J.B. , Internal Combustion Engine Fundamentals (McGraw Hill, 1988), aligne.
- El-Mawla, A. and Mirsky, W. , “Hydrocarbons in the Partial-Quench Zone of Flames: An Approach to the Study of the Flame Quenching Process,” SAE Technical Paper 660112, 1966, https://doi.org/10.4271/660112.
- Seegmiller, S. , “Examination of Hydrocarbon Emission Mechanisms in a Flame Propagation Engine Model,” SAE Technical Paper 930715, 1993, https://doi.org/10.4271/930715.
- Panesar, A., Brown, P., and Woods, W. , “The Results of Recent Experiments on Unburnt Hydrocarbons,” SAE Technical Paper 884045, 1988.
- Browning, L. and Pefley, R. , “Kinetic Wall Quenching of Methanol Flames with Applications to Spark Ignition Engines,” SAE Technical Paper 790676, 1979, https://doi.org/10.4271/790676.
- Hasse, C. and Peters, N. , “Differences between Iso-Octane and Methane during Wall Quenching with Respect to HC Emissions,” SAE Technical Paper 2000-01-2807, 2000, https://doi.org/10.4271/2000-01-2807.
- Sellnau, M., Springer, G., and Keck, J. , “Measurements of Hydrocarbon Concentrations in the Exhaust Products from a Spherical Combustion Bomb,” SAE Technical Paper 810148, 1981, https://doi.org/10.4271/810148.
- Blint, R. and Bechtel, J. , “Hydrocarbon Combustion near a Cooled Wall,” SAE Technical Paper 820063, 1982, https://doi.org/10.4271/820063.
- Peckham, M. and Collings, N. , “Flametube Studies of Wall Quench,” SAE Technical Paper 912375, 1991, https://doi.org/10.4271/912375.
- Cleary, D. and Farrell, P. , “Single-Surface Flame Quenching Distance Dependence on Wall Temperature, Quenching Geometry, and Turbulence,” SAE Technical Paper 950162, 1995, https://doi.org/10.4271/950162.
- Adamczyk, A.A. and Lavoie, G.A. , “Laminar Head-on Flame Quenching-A Theoretical Study,” SAE Transactions 87:3652-3671, 1978.
- Lavoie, G. , “Correlations of Combustion Data for S. I. Engine Calculations - Laminar Flame Speed, Quench Distance and Global Reaction Rates,” SAE Technical Paper 780229, 1978, https://doi.org/10.4271/780229.
- Isack, A., Askey, J., Adamczyk, A., Lavoie, G. et al. , “The Effect of Turbulence on the Hydrocarbon Emissions from Combustion in a Constant Volume Reactor,” SAE Technical Paper 840366, 1984, https://doi.org/10.4271/840366.
- Amano, T. and Okamoto, K. , “Unburned Hydrocarbons Emission Source from Engines,” SAE Technical Paper 2001-01-3528, 2001, https://doi.org/10.4271/2001-01-3528.
- Metghalchi, M. and Keck, J.C. , “Laminar Burning Velocity of Propane-Air Mixtures at High Temperature and Pressure,” Combustion and Flame 38:143-154, 1980.
- Boust, B., Sotton, J., Labuda, S.A., and Bellenoue, M. , “A Thermal Formulation for Single-Wall Quenching of Transient Laminar Flames,” Combustion and Flame 149(3):286-294, 2007.
- Turcios, M., Ollivier-Gooch, C., and Huang, J. , “Numerical Calculation of Quench Distance for Laminar Premixed Flames under Engine Relevant Conditions,” SAE Technical Paper 2011-01-1997, 2011, https://doi.org/10.4271/2011-01-1997.
- Teraji, A., Tsuda, T., Noda, T., Kubo, T., and Itoh, T. , “Prediction of Unburned HCs by Using Three-Dimensional Combustion Simulation in Spark Ignition Engines,” Journal of the Combustion Society of Japan 49(147), 2007.
- Henningsen, S. , “A Theoretical Model for Propagating and Quenching of a One-Dimensional, Laminar Two-Reaction Flame,” SAE Technical Paper 800105, 1980, https://doi.org/10.4271/800105.
- An, Y., Teng, S., Li, X., Qin, J. et al. , “Study of Polycyclic Aromatic Hydrocarbons Evolution Processing in GDI Engines Using TRF-PAH Chemical Kinetic Mechanism,” SAE Technical Paper 2016-01-0690, 2016, https://doi.org/10.4271/2016-01-0690.
- An, Y.Z. et al. , “Development of a PAH (Polycyclic Aromatic Hydrocarbon) Formation Model for Gasoline Surrogates and its Application for GDI (Gasoline Direct Injection) Engine CFD. (Computational Fluid Dynamics) Simulation,” Energy 94:367-379, 2016.
- An, Y.Z. et al. , “Kinetic Modeling of Polycyclic Aromatic Hydrocarbons Formation Process for Gasoline Surrogate Fuels,” Energy Conversion and Management 100:249-261, 2015.
- Tsurushima, T. , “A New Skeletal PRF Kinetic Model for HCCI Combustion,” Proceedings of the Combustion Institute 32(2):2835-2841, 2009.
- Oehlschlaeger, M.A., Davidson, D.F., and Hanson, R.K. , “Investigation of the Reaction of Toluene with Molecular Oxygen in Shock-Heated Gases,” Combustion and Flame 147(3):195-208, 2006.
- Lien, F.S. and Leschziner, M.A. , “Low-Reynolds-Number Eddy-Viscosity Modelling Based on Non-Linear Stress-Strain/Vorticity Relations,” in Proceedings of the 3rd Symposium on Engineering Turbulence Modelling and Measurements, Crete, Greece, 1996.
- Pomraning, E. , “Development of Large Eddy Simulation Turbulence Models,” Ph.D. thesis, University of Wisconsin-Madison, Madison, WI, 2000.
- Kim, S.-E. and Choudhury, D. , “A Near-Wall Treatment Using Wall Functions Sensitized to Pressure Gradient,” Separated and Complex Flows 217:273-280, 1995.