Investigation of the chemical structures of laminar premixed flames fueled by acetaldehyde

Abstract

Acetaldehyde is a key intermediate formed during the combustion of hydrocarbon and oxygenated fuels, and its role as an air pollution is concern-arousing. A better understanding of its combustion characteristics is of significance in developing core mechanisms and reducing the associated emissions. In this work, chemical structures of low-pressure laminar premixed acetaldehyde flames with equivalence ratios of 1.7 and 1.0 were measured by employing molecular-beam mass spectrometry with synchrotron vacuum ultraviolet light for ionization. Totally, about 40 species were identified and their mole fraction profiles are reported with well estimated uncertainty. To our knowledge, some oxygenated species, such as ethenol and butanal, were measured for the first time in acetaldehyde flames. Experimental species mole fraction profiles were compared with modeling results using several available kinetic mechanisms. These mechanisms well reproduce the mole fraction profiles of the major species and the C 1 /C 2 hydrocarbon intermediates, however, their unsatisfactory predictive capability for some fuel-related oxygenated intermediates, such as C 2 H 3 O isomers, suggests that the acetaldehyde sub-mechanism needs further investigation. Our experimental results provide valuable information for future mechanism development.

Kinetics of Ethylene Glycol: The first validated reaction scheme and first measurements of ignition delay times and speciation data

“…Taatjes et al [17,18] investigated many hydrocarbon flames depicting most of the chemical classes and concluded that in the low pressure hydrocarbon flames, the major source of enols is through reactions of alkenes with OH. Since then, various studies reported ethenol formation in hydrocarbons and various oxygenated fuels [14,[19][20][21][22][23][24][25][26]. The consumption of ethenol can be through direct and/or radical-catalyzed tautomerization forming acetaldehyde or through decomposition forming other products.…”

Emission of Carbonyl and Polyaromatic Hydrocarbon Pollutants From the Combustion of Liquid Fuels: Impact of Biofuel Blending

“…• CHOH → CH 3 CHO) can explain the high concentrations of formaldehyde and acetaldehyde [24]. As proposed by Tao et al [25], the degradation of acetaldehyde can result in the formation of CH 3…”

Laminar Burning Velocity and Ignition Delay Time of Oxygenated Biofuel

“…In the end, due to the huge differences observed during the research, the authors recommended the need for new experimental and detailed numerical studies. Tao et al [145] reported nearly 40 species in laminar and premixed flames of acetaldehyde. Christensen et al [146] studied the laminar burning velocities at atmospheric pressure and different initial temperatures.…”