T. Selerland et Ar. Karagozian, IGNITION, BURNING AND EXTINCTION OF A STRAINED FUEL STRIP WITH COMPLEX KINETICS, Combustion science and technology, 131(1-6), 1998, pp. 251
Flame structure and ignition and extinction processes associated with
a strained fuel strip are explored numerically using detailed transpor
t and complex kinetics for a propane-air reaction. Ignition modes are
identified that are similar to those predicted by one-step activation
energy asymptotics, i.e., modes in which diffusion dames can ignite as
independent or dependent interfaces and modes in which single premixe
d or partially premixed flames ignite and burn. These ignition modes h
ave been found to be dependent on critical combinations of strain rate
, fuel strip thickness and initial reactant temperatures. The formatio
n of NO/NO2 is found to be strongly dependent on strain rate and the l
ocal molecular mixing of reactants which occurs as a consequence of st
rain. Extinction in this configuration is seen to occur due to fuel co
nsumption by adjacent flames, although viscosity is seen to have the e
ffect of delaying extinction by reducing the effective strain rate exp
erienced by the flames. Response of the flames to oscillatory strain r
ates is seen to be strongly dependent on the amplitude and frequency o
f the oscillation.