Abstract
In order to clarify the relation between the evaporation process and the ignition mechanism of a fuel droplet (approximately 2 mm in diameter) on a hot surface, the mass of fuel ( n-cetane) evaporated in an arbitrary short duration soon after the droplet comes into contact with the hot plate surface whose temperature is higher than the Leidenfrost temperature has been measured. Then the profiles of fuel concentration around the droplet are obtained by the numerical integration of the unsteady diffusion equation in spherical coordinates using the experimental results mentioned above. It is shown that the location calculated as the place where the stoichiometric mixture is formed at the ignition delay time is in good agreement with the observation of the initial flame position at the ignition.
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