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Impact of Fuel Properties and Flame Stretch on the Turbulent Flame Speed in Spark-Ignition Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 8, 2013 by SAE International in United States
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The current decrease in fossil energy resources requires a diversification of the liquid and gaseous fuels potentially consumable in internal combustion engines. The use of these fuels modifies the combustion process and the heat released as well. In a Spark Ignition (SI) engine, the heat released is mainly piloted not only by the mixture reactivity but also by its sensitivity to stretch effects. Only a few results can be found in the literature about stretch effects for SI engine configurations. The purpose of the present paper is to evaluate stretch effects on the flame front propagation in an optical SI engine and to investigate the relative importance of these effects depending on the fuel considered.
Different air-fuel mixtures presenting different flame stretch sensitivities were selected. Four different engine regimes (1400, 1600, 1800 and 2000 rpm) were studied for all the mixtures in order to evaluate the impact of different turbulence intensities. In-cylinder pressure analyses were performed to determine the heat release rate and the crank angle corresponding to 5% of mass burned. At the same time, direct visualizations of the flame through the piston were performed using an intensified high-speed video camera. From the recorded images, a global flame stretch and an equivalent propagation speed were defined and their evolution studied. An increase in the stretch rate is observed for higher engine speeds but the combustion process for the mixtures presenting a strong sensitivity to stretch is slowed down when the regime is increased.
CitationBrequigny, P., Mounaïm-Rousselle, C., Halter, F., Moreau, B. et al., "Impact of Fuel Properties and Flame Stretch on the Turbulent Flame Speed in Spark-Ignition Engines," SAE Technical Paper 2013-24-0054, 2013, https://doi.org/10.4271/2013-24-0054.
- Candel S.M., Poinsot T.J., Flame Stretch and the Balance Equation for the Flame Area, Combustion Science and Technology. 70 (1990) 1-15.
- Bradley D., Hicks R.A., Lawes M., Sheppard C.G.W., Woolley R., The Measurement of Laminar Burning Velocities and Markstein Numbers for Iso-octane-Air and Iso-octane-n-Heptane-Air Mixtures at Elevated Temperatures and Pressures in an Explosion Bomb, Combustion and Flame. 115 (1998) 126-144.
- Bradley D., Lawes M., Mansour M.S., Explosion bomb measurements of ethanol-air laminar gaseous flame characteristics at pressures up to 1.4MPa, Combustion and Flame. 156 (2009) 1462-1470.
- Kelley A.P., Smallbone A.J., Zhu D.L., Law C.K., Laminar flame speeds of C5 to C8 n-alkanes at elevated pressures: Experimental determination, fuel similarity, and stretch sensitivity, Proceedings of the Combustion Institute. 33 (2011) 963-970.
- Bradley D., Lawes M., Liu K., Mansour M.S., Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures, Proceedings of the Combustion Institute. (2012).
- Abdel-Gayed R.G., Bradley D., Hamid M.N., Lawes M., Lewis number effects on turbulent burning velocity, Symposium (International) on Combustion. 20 (1985) 505-512.
- Renou B., Boukhalfa A., Puechberty D., Trinité M., Effects of stretch on the local structure of freely propagating premixed low-turbulent flames with various lewis numbers, Symposium (International) on Combustion. 27 (1998) 841-847.
- Aleiferis P.G., Taylor A.M.K.P., Ishii K., Urata Y., The nature of early flame development in a lean-burn stratified-charge spark-ignition engine, Combustion and Flame. 136 (2004) 283-302.
- Aleiferis P.G., Serras-Pereira J., Richardson D., Characterisation of flame development with ethanol, butanol, iso-octane, gasoline and methane in a direct- injection spark-ignition engine, Fuel. (2013).
- Serras-Pereira, J., Aleiferis, P., Richardson, D., and Wallace, S., “Characteristics of Ethanol, Butanol, Iso-Octane and Gasoline Sprays and Combustion from a Multi-Hole Injector in a DISI Engine,” SAE Int. J. Fuels Lubr. 1(1):893-909, 2009, doi:10.4271/2008-01-1591.
- Driscoll J.F., Turbulent premixed combustion: Flamelet structure and its effect on turbulent burning velocities, Progress in Energy and Combustion Science. 34 (2008) 91-134.
- Richard S., Colin O., Vermorel O., Benkenida A., Angelberger C., Veynante D., Towards large eddy simulation of combustion in spark ignition engines, Proceedings of the Combustion Institute. 31 (2007) 3059-3066.
- Markstein G.H., Non-steady Flame Propagation, Pergamon Press, 1964.
- Clavin P., Dynamic behavior of premixed flame fronts in laminar and turbulent flows, Progress in Energy and Combustion Science. 11 (1985) 1-59.
- Chen Z., On the extraction of laminar flame speed and Markstein length from outwardly propagating spherical flames, Combustion and Flame. 158 (n.d.) 291-300.
- Kelley A.P., Law C.K., Nonlinear effects in the extraction of laminar flame speeds from expanding spherical flames, Combustion and Flame. 156 (2009) 1844-1851.
- Halter F., Tahtouh T., Mounaïm-Rousselle C., Nonlinear effects of stretch on the flame front propagation, Combustion and Flame. 157 (2010) 1825-1832.
- Broustail G., Seers P., Halter F., Moréac G., Mounaim-Rousselle C., Experimental determination of laminar burning velocity for butanol and ethanol iso-octane blends, Fuel. 90 (2011) 1-6.
- Tahtouh T., Halter F., Mounaïm-Rousselle C., Measurement of laminar burning speeds and Markstein lengths using a novel methodology, Combustion and Flame. 156 (2009) 1735-1743.
- Pajot, O., Mounaϊm-Rousselle, C., and Queiros-Conde, D., “New Data on Flame Behaviour in Lean Burn S.I. Engine,” SAE Technical Paper 2001-01-1956, 2001, doi:10.4271/2001-01-1956.
- Jerzembeck S., Peters N., Pepiot-Desjardins P., Pitsch H., Laminar burning velocities at high pressure for primary reference fuels and gasoline: Experimental and numerical investigation, Combustion and Flame. 156 (2009) 292-301.
- Sarathy S.M., Vranckx S., Yasunaga K., Mehl M., Oßwald P., Metcalfe W.K., et al., A comprehensive chemical kinetic combustion model for the four butanol isomers, Combustion and Flame. 159 (2012) 2028-2055.
- Galmiche B., Halter F., Foucher F., Effects of high pressure, high temperature and dilution on laminar burning velocities and Markstein lengths of iso-octane/air mixtures, Combustion and Flame. 159 (2012) 3286-3299.
- Gu X.J.J., Haq M.Z.Z., Lawes M., Woolley R., Laminar burning velocity and Markstein lengths of methane-air mixtures, Combustion and Flame. 121 (2000) 41-58.
- Broustail G., Halter F., Seers P., Moréac G., Mounaïm-Rousselle C., Experimental determination of laminar burning velocity for butanol/iso-octane and ethanol/iso-octane blends for different initial pressures, Fuel. 106 (2013) 310-317.