1970-02-01

The Ignition Delay and Combustion of a Drop Under Pressure on a Hot Surface 700502

The ignition delay, combustion time, and smoke from a single drop of fuel on a hot surface were studied at various pressures up to 69 atm. The experimental results were correlated with previous data for drop evaporation on a hot surface, thereby yielding evidence that physical factors, in particular the rate of evaporation and consequent mixture formation, strongly influence the ignition delay and combustion of a drop. It is also shown that the magnitude of the critical temperature and pressure of a liquid fuel plays a significant role in all aspects of its combustion.
A mechanism of ignition is proposed which contributes to better understanding of ignition delay phenomena.

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