Abstract
An experimental study has been made of the ignition process of fuel droplet array subjected to a laminar fiat flame propagating through a lean homogeneous propane-air mixture at constant pressure. A combustion chamber made of a transparent duct was installed with spark electrodes, a pair of fine quartz fibers to suspend fuel droplets and a shutter to allow the burned gas to flow out. A high speed video camera was provided for the photographic observation of the droplets ignited by the propagating flame and for the determination of the ignition delay. The results showed that the ignition delay increased with a decrease in the volatility of liquid fuel and an increase in the initial droplet diameter. A part of the propagating flame behind the droplet was deformed to be convex toward the unburned gas as it passed by the highly volatile fuel droplet. Also evident was that the ignition delay of the second droplet showed a minimum as a function of droplet spacing.
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