Ignition of Two-Component Fuel Droplet in High-Temperature Ambient.

Abstract

The ignition of a suspended droplet in high-temperature ambient was investigated experimentally for n-heptane/n-hexadecane blends. The effects of initial fuel mixture ratio, initial droplet diameter and ambient temperature on ignition time were observed. For pure n-heptane droplets, ignition time is roughly constant with the initial droplet diameter, and it decreases gradually with increase in the initial droplet diameter under lower ambient temperatures. On the other hand, ignition time increases with increase in the initial droplet diameter for pure n-hexadecane. For the case of mixed fuel, the results show that there exists an initial droplet diameter at which the ignition time takes the maximum value, and that this diameter increases with decrease in the initial concentration of n-heptane or the ambient temperature.