Short-Duration Autoignition Temperature Measurements for Hydrocarbon Fuels Near Heated Metal Surfaces.
Short-Duration Autoignition Temperature Measurements for
Hydrocarbon Fuels Near Heated Metal Surfaces.
Smyth, K. C.; Bryner, N. P.
Combustion Science and Technology, Vol. 126, 225-253,
hydrocarbon fuels; autoignition; nickel; premixed
flames; stainless steels; titanium
An apparatus has been designed, built, and extensivley
tested for making short-duration autoignition
temperature measurements of hydrocarbon fuels under
atmospheric pressure conditions where the fuel/air
stoichiometry, the nature of the hot metal surface, and
the contact time between the fuel air mixture and the
heated surface are well controlled. This approach
provides a much more reliable database to establish the
importance of fuel structure and surface effects on
measured autoignition temperatures than the current ASTM
E659 procedure, which involves variable ignition delay
times and unspecified stoichiometries for ignition in a
heated glass flask. Two series of tests have been
conducted: (1) over 1100 individual autoignition
temperature determinations for the ignition of 15
hydrocrabon fuels containing 1 to 8 carbon atoms on
heated nickel, stainless steel, and titanium surfaces
for three different stoichiometries, and (2) ~190
determinations for 10 linear and branched alkanes on
heated nickel for stoichiometric conditions. Excellent
repeatability has been achieved within a given series of
measurements and good replicate values have been
obtained for data collected on separate days.