Hierarchical and comparative kinetic modeling of laminar flame speeds of hydrocarbon and oxygenated fuels

Ranzi, E.; Frassoldati, Alessio; Graña, Roberto Barberena; Cuoci, Alberto; Faravelli, Tiziano; Kelley, Andrew; Law, Chung K.

doi:10.1016/j.pecs.2012.03.004

Cited by 794 publications

(504 citation statements)

References 140 publications

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“…Several experimental methods can be used to measure the laminar burning velocity of fuels: the onedimensional (1D) burner-stabilized flame, the counterflow flame, the expanding spherical flame, the Bunsen flame, etc. 5 However, experimental measurements of the laminar burning velocity are mostly limited in pressure and temperature and are compromised by the effects of flame stretch and instabilities. Computationally, these effects can be avoided by calculating 1D, planar adiabatic flames using chemical oxidation mechanisms.…”

Section: ■ Introductionmentioning

confidence: 99%

Alternative Fuels for Spark-Ignition Engines: Mixing Rules for the Laminar Burning Velocity of Gasoline–Alcohol Blends

et al. 2012

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Experimental measurements of the laminar burning velocity are mostly limited in pressure and temperature and can be compromised by the effects of flame stretch and instabilities. Computationally, these effects can be avoided by calculating one-dimensional, planar adiabatic flames using chemical oxidation mechanisms. Chemical kinetic models are often large, complex and take a lot of computation time, and few models exist for multi-component fuels. The aim of the present study is to investigate if simple mixing rules are able to predict the laminar burning velocity of fuel blends with a good accuracy. An overview of different mixing rules to predict the laminar burning is given and these mixing rules are tested for blends of hydrocarbons and ethanol. Experimental data of ethanol/n-heptane and ethanol/n-heptane/iso-octane mixtures and modeling data of an ethanol/nheptane blend and blends of ethanol and a toluene reference fuel are used to test the different mixing rules. Effects of higher temperature and pressure on the performance of the mixing rules are investigated. It was found that simple mixing rules that consider only the change in composition are accurate enough to predict the laminar burning velocity of ethanol/hydrocarbon blends. For the blends used in this study, a Le Chatelier's rule based on energy fractions is preferable because of the similar accuracy in comparison to other mixing rules while being more simple to use.

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Section: ■ Introductionmentioning

confidence: 99%

Alternative Fuels for Spark-Ignition Engines: Mixing Rules for the Laminar Burning Velocity of Gasoline–Alcohol Blends

et al. 2012

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“…As the geometry of the combustion chamber and the operating conditions were the same it is likely that this behaviour of M85 can be explained by the combustion kinetics of methanol. The high laminar flame speed of methanol was explained on the basis of the successive dehydrogenations of the methoxyl radical by Veloo et al [66] in Ranzi et al [67]. Finally, Table 8 summarises the effect of different engine speeds and higher CRs on the flame speeds of the tested fuels.…”

Section: Resultsmentioning

confidence: 98%

Assessment of elliptic flame front propagation characteristics of iso-octane, gasoline, M85 and E85 in an optical engine

Ihracska

Korakianitis

Ruiz

et al. 2014

Combustion and Flame

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a b s t r a c tPremixed fuel-air flame propagation is investigated in a single-cylinder, spark-ignited, four-stroke optical test engine using high-speed imaging. Circles and ellipses are fitted onto image projections of visible light emitted by the flames. The images are subsequently analysed to statistically evaluate: flame area; flame speed; centroid; perimeter; and various flame-shape descriptors. Results are presented for gasoline, isooctane, E85 and M85. The experiments were conducted at stoichiometric conditions for each fuel, at two engine speeds of 1200 rpm (rpm) and 1500 rpm, which are at 40% and 50% of rated engine speed. Furthermore, different fuel and speed sets were investigated under two compression ratios (CR: 5.00 and 8.14). Statistical tools were used to analyse the large number of data obtained, and it was found that flame speed distribution showed agreement with the normal distribution. Comparison of results assuming spherical and non-isotropic propagation of flames indicate non-isotropic flame propagation should be considered for the description of in-cylinder processes with higher accuracy. The high temporal resolution of the sequence of images allowed observation of the spark-ignition delay process. The results indicate that gasoline and isooctane have somewhat similar flame propagation behaviour. Additional differences between these fuels and E85 and M85 were also recorded and identified.

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“…Toluene is an essential aromatic component found in gasoline and surrogate fuels seeing it plays an important role in suppressing autoignition and reduce the tendency of engine knock with a higher RON number compared to typical n-alkanes [47,48]. Anisole has the similar RON value (118 for toluene and 119 for anisole) indicating the same advantages with those of toluene presents in gasoline fuels.…”

Section: Mixture Of St0mentioning

confidence: 99%

Laminar flame speed of lignocellulosic biomass-derived oxygenates and blends of gasoline/oxygenates

Rossow

Modica

et al. 2017

Fuel

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Hierarchical and comparative kinetic modeling of laminar flame speeds of hydrocarbon and oxygenated fuels

Cited by 794 publications

References 140 publications

Alternative Fuels for Spark-Ignition Engines: Mixing Rules for the Laminar Burning Velocity of Gasoline–Alcohol Blends

Alternative Fuels for Spark-Ignition Engines: Mixing Rules for the Laminar Burning Velocity of Gasoline–Alcohol Blends

Assessment of elliptic flame front propagation characteristics of iso-octane, gasoline, M85 and E85 in an optical engine

Laminar flame speed of lignocellulosic biomass-derived oxygenates and blends of gasoline/oxygenates

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