Open AccessReaction Mechanisms Testing with Spatial and Thermal Resolutions of Methane/Air Flames
Author(s) -
Akram Mohammad
Publication year - 2022
Publication title -
maǧallaẗ al-abḥāṯ al-handasiyyaẗ
Language(s) - English
Resource type - Journals
eISSN - 2307-1885
pISSN - 2307-1877
DOI - 10.36909/jer.15115
Subject(s) - methane , stoichiometry , thermal , flame structure , formaldehyde , reaction rate , chemistry , reaction mechanism , atmospheric pressure , elementary reaction , materials science , thermodynamics , mechanics , meteorology , combustion , kinetics , organic chemistry , catalysis , physics , quantum mechanics , combustor
Spatial and thermal dispersals of hydroxyl (OH), formaldehyde (CH2O), and other minor species have been acquired using various detail reaction mechanisms in the weak flame of stoichiometric methane and air mixture at ambient pressure. The weak flame was simulated inside a microflowcombustor with a prescribed temperature profile which releases a very small amount of heat. A wide reaction zone (~ 1 cm) was observed for methane and air flames compared to normal/conventional flames. Detailed oxidation analysis was carried out based on the normal and weak flames simulations. The computational flame structure was assessed with the experimentalresults available in the existing literature. Numerical modeling under the experimental conditions with various detail mechanism predicts a similar wide reaction zone. However, the species production and consumption temperatures were observed to vary for the different mechanisms used in present studies. The GRI mech 3.0 shows a typical two-peak heat release rate profile. The initial breakdown of fuel is vital for such scatter. The production of OH radical governs the initial breakdown of fuel at the intermediate temperatures. The present investigation is pretty useful in understanding the chemistry of intermediate species for different fuel-air mixtures specially at intermediate temperatures 800–1200 K.