Fuad Alasfour - Academia.edu (original) (raw)
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Papers by Fuad Alasfour
Symposium (International) on Combustion, 1991
Laminar, premixed flat flames of CH 4 with 5120 have been stabilized and studied at 50 torr. This... more Laminar, premixed flat flames of CH 4 with 5120 have been stabilized and studied at 50 torr. This study represents the first nearly complete study of the structure and kinetics of CH4---N20 flames including stable and unstable species measurements and detailed chemical kinetic modeling. Three flames were investigated, with slightly fuel rich, near stoichiometric and lean mixtures. Stable species concentration profiles were measured using probe sampling with gas chromatographic sample analysis. Laser-Induced Fluorescence was used to measure the composition of the intermediate species CH, CN, Nil, NH~, and OH. Temperature was measured with coated, radiation corrected thermocouples and by the LIF rotational temperature of CN. The CH4----NaO flames have high N2 and H20 and low NO concentration in the products. The CO is oxidized to C02 through its reaction with OH. These flames were characterized by strong radical emission spectra, but no NH2 fluorescence signal was observed. A reaction mechanism was developed for the CH4--NzO flames and results are presented comparing the calculated and experimental profiles of species concentration for the flame with equivalence ratio 1.13. Comparison of the stable species profiles is very good; comparison of the unstable species profiles is qualitatively correct with some displacement of the concentration maxima calculated compared to the data. Sensitivity analysis was used to evaluate the effects of changing rate constants in the mechanism on the species concentration profiles. The flame modeling and sensitivity analysis suggest the major reaction paths responsible for the conversion of reactants to products and the formation and consumption of the intermediates.
Symposium (International) on Combustion, 1991
Laminar, premixed flat flames of CH 4 with 5120 have been stabilized and studied at 50 torr. This... more Laminar, premixed flat flames of CH 4 with 5120 have been stabilized and studied at 50 torr. This study represents the first nearly complete study of the structure and kinetics of CH4---N20 flames including stable and unstable species measurements and detailed chemical kinetic modeling. Three flames were investigated, with slightly fuel rich, near stoichiometric and lean mixtures. Stable species concentration profiles were measured using probe sampling with gas chromatographic sample analysis. Laser-Induced Fluorescence was used to measure the composition of the intermediate species CH, CN, Nil, NH~, and OH. Temperature was measured with coated, radiation corrected thermocouples and by the LIF rotational temperature of CN. The CH4----NaO flames have high N2 and H20 and low NO concentration in the products. The CO is oxidized to C02 through its reaction with OH. These flames were characterized by strong radical emission spectra, but no NH2 fluorescence signal was observed. A reaction mechanism was developed for the CH4--NzO flames and results are presented comparing the calculated and experimental profiles of species concentration for the flame with equivalence ratio 1.13. Comparison of the stable species profiles is very good; comparison of the unstable species profiles is qualitatively correct with some displacement of the concentration maxima calculated compared to the data. Sensitivity analysis was used to evaluate the effects of changing rate constants in the mechanism on the species concentration profiles. The flame modeling and sensitivity analysis suggest the major reaction paths responsible for the conversion of reactants to products and the formation and consumption of the intermediates.