Dias, Véronique
[UCL]
Jeanmart, Hervé
[UCL]
The combustion of various oxygenated compounds is studied in laminar premixed flat flames, at low pressure, with the aim of evaluating the formation of pollutants and their concentrations. In this work, we study four oxygenated species which are fundamental in several energetic and environmental problematics: - ethanol (C2H5OH) and acetaldehyde (CH3CHO) as potential alternative fuels, - acetic acid (CH3COOH) in the perspective of reducing the emission of this pollutant mainly present in acid rain, - formaldehyde (CH2O) which is an important intermediate species in hydrocarbon and oxygenated species. Its emissions are harmful to the health and the environment. They should be decreased. The structures of these four oxygenated flames were investigated experimentally at low pressure (50 mbar), using a molecular beam sampling coupled with a mass spectrometer. The initial compositions were: - CH2O/O2/Ar (φ = 1.09) and CH2O/O2 (φ = 0.22) [1] - C2H5OH/O2/Ar (φ = 0.75 – 1.00 – 1.25) [2] - CH3CHO/O2/Ar (φ = 0.75 – 1.00 – 1.25) [3] - CH3COOH/O2/Ar (φ = 0.77 – 0.90 – 1.05) [4] Over the last few decades, sub-mechanisms for several fuels have been developed taking into account the formation and the consumption of species detected in these flames. This work will contribute to the effort of developing and improving a global reaction mechanism, the «UCL» mechanism: a unique kinetic model that is able to simulate the combustion of all the studied fuels. This mechanism will provide precious information on the degrees and the rates of reactants conversion, the formation pathways of pollutants, the effects of additives, etc. Thus far, the «UCL» mechanism [5] has already been validated against several flames of hydrocarbons: CH4 (methane), C2H2 (acetylene), C2H4 (ethylene), C2H6 (ethane), iC4H8 (isobutene) but also against flames of oxygenated species: C3H8O2 (methylal) and C5H12O2 (ethylal). This work extends the validity of the kinetic model to the aforementioned oxygenated fuels. It now contains 111 chemical species and 587 elementary reactions. This mechanism is available on the website [5]: www.veroniquedias.github.com, with all the experimental data of the flames described above. References [1] V. Dias, C. Duynslaegher, F. Contino, J. Vandooren, H. Jeanmart, Experimental and modeling study of formaldehyde combustion in flames, Combustion and Flame 159 (2012) 1814-1820. [2] N. Leplat, P. Dagaut, C. Togbé, J. Vandooren, Numerical and experimental study of ethanol combustion and oxidation in laminar premixed flames and in jet-stirred reactor, Combustion and Flame 158 (2010) 705-725. [3] N. Leplat, J. Vandooren, Experimental investigation and numerical simulation of the structure of CH3CHO/O2/Ar flames at different equivalence ratios, Combust. Sci. and Tech. 182 (2010) 436-448. [4] N. Leplat, J. Vandooren, Numerical and experimental study of the combustion of acetic acid in laminar premixed flames, Combustion and Flame 159 (2012) 493-499. [5] www.veroniquedias.github.com


Bibliographic reference |
Dias, Véronique ; Jeanmart, Hervé. Kinetic model for oxygenated species combustion.Twenty-Second Journées d'Etudes of the Belgian Section of the Combustion Institute (Leuven, Belgium, du 11/09/2012 au 12/09/2012). |
Permanent URL |
http://hdl.handle.net/2078/116730 |