Hydrocarbon burning velocities determination using modified CFR engine

Uso de motor CFR modificado para medição de velocidade de queima de hidrocarbonetos

SANTOS, Dinarte; NUNES, Gustavo; MIRANDA, Kleiton Ferreira

Artigo:

Hydrocarbon burning velocities have been investigated for a long time, as they affect internal combustion engine performance. Burning velocities depend on temperature, pressure and mixture composition, and can be evaluated by open pipe or constant volume vessel techniques. Farrell [2] published experimental data on combustion velocities for pure compounds measured in a constant volume vessel under typical conditions of temperature and pressure found at the end of an Otto engine compression stroke. Dalavia proposed a method of assessing overall burning time in an Otto cycle CFR engine, measuring the time elapsed from the mixture ignition to the flame front arrival at the opposite cylinder wall, as detected by an ionization sensor. Our work compared flame travel times measured in a modified CFR engine to burning velocity data published by Farrell for pure hydrocarbons, checking the correlation between them. The mean combustion speeds of ten pure hydrocarbons were evaluated at stoichiometric conditions, keeping the compression ratio constant as the ignition advance was changed. The results were validated and the modified CFR engine was found to be an effective tool to determine burning velocities.

Hydrocarbon burning velocities have been investigated for a long time, as they affect internal combustion engine performance. Burning velocities depend on temperature, pressure and mixture composition, and can be evaluated by open pipe or constant volume vessel techniques. Farrell [2] published experimental data on combustion velocities for pure compounds measured in a constant volume vessel under typical conditions of temperature and pressure found at the end of an Otto engine compression stroke. Dalavia proposed a method of assessing overall burning time in an Otto cycle CFR engine, measuring the time elapsed from the mixture ignition to the flame front arrival at the opposite cylinder wall, as detected by an ionization sensor. Our work compared flame travel times measured in a modified CFR engine to burning velocity data published by Farrell for pure hydrocarbons, checking the correlation between them. The mean combustion speeds of ten pure hydrocarbons were evaluated at stoichiometric conditions, keeping the compression ratio constant as the ignition advance was changed. The results were validated and the modified CFR engine was found to be an effective tool to determine burning velocities.

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DOI: 10.5151/engpro-simea2016-PAP110

Referências bibliográficas

• [1] Dalávia, D; Santos, D.; Buboli, H. C.; Bortolini, M.; Bassani, I. A. Modifications in CFR Engine in Order to Measure Overall Burning Time. SAE Paper 2010-36-0119P
• [2] Farrell, J. T.; Johnston, R. J.; Androulakis, I. P. Molecular Structure Effects On Laminar Burning Velocities At Elevated Temperature And Pressure. SAE Paper 2004-01-2936
• [3] Guibet, J. C.; Martin, B. Carburants et Moteurs. Éditions Technip, Paris, 1975.
• [4] Heywood, J. B. Internal Combustion Engine Fundamentals. McGraw-Hill, 1988.
• [5] Lenz, H. P. Mixture Formation in Spark-Ignition Engines. Springer-Verlag, 1992.

Como citar:

SANTOS, Dinarte; NUNES, Gustavo; MIRANDA, Kleiton Ferreira; "Hydrocarbon burning velocities determination using modified CFR engine", p-838-844. In: Anais do XXIV Simpósio Internacional de Engenharia Automotica - SIMEA 2016 [=Blucher Engineering Proceedings].. São Paulo: Blucher, 2016.
ISSN 23577592, DOI 10.5151/engpro-simea2016-PAP110