Abstract-
To model the combustion of gasoline, kerosene, or other long-chain hydrocarbon
fuels, an accurate kinetics mechanism must first be developed for the
oxidation of small hydrocarbons, such as methane, ethane, and ethylene.
Even for methane, a generally accepted mechanism is still elusive due to a
lack of kinetically-independent experimental data. In this work, a combined
experimental and modeling technique is developed to validate and further
optimize these mechanisms, towards the development of a predictive model for
small hydrocarbon combustion. This technique relies on detailed measurements
of strained flames in a jet-wall stagnation flow using simultaneous Particle
Streak Velocimetry (PSV) and CH Planar Laser Induced Fluorescence (PLIF).
Stagnation flames are simulated using a one-dimensional model with accurate
specification of the requisite boundary conditions. Velocity profiles of both
non-reacting and reacting stagnation flow are found to be independent of the
nozzle-to-plate separation distance. Model predictions are directly compared
to experimental profiles to assess the accuracy of several kinetics
mechanisms. Mechanism performance is found to be relatively independent of
both the mixture dilution and the imposed strain rate, while exhibiting a
stronger dependence on the fuel type and stoichiometry. Results for methane,
ethane, and ethylene flames will be discussed.
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