In this work gaseous fuels were released continuously and
concentrically into confined annular co-flows of turbulent hot air.
Following injection the fuel and air mixed and at some length
downstream of the nozzle the reactive mixture autoignited. Original
phenomena are reported of autoignition spots, unsteady flame
propagation and extinction or flashback. The frequency of the spots
was measured, as were their acoustic and chemiluminescence
characteristics. Optical measurements of the autoignition locations
were made and used to estimate mean delay times from injection. As
would be expected by considerations of simple chemical kinetics and
the mean concentration field, higher air temperatures and lower
fuel velocities resulted in autoignition closer to the injector.
However, as the air velocity and hence also turbulent fluctuations
were increased, autoignition shifted downstream and was delayed,
while its frequency and sound intensity decreased. Such and other
situations are presented that cannot be explained purely in terms
of chemical arguments, i.e. homogeneous delay times, highlighting
the significance of the mixing field through the mixture fraction
and scalar dissipation rate.
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