Gas‐phase ignition of a dilute spray

Abstract

Abstract Using asymptotic perturbation analysis in the limit of large activation energy, and assuming the spray is dilute such that the droplet effects are of e order, the behavior of gas‐phase ignition of a stagnant dilute spray is described on the basis of the strength of a chemical reaction in a gas‐phase mixture, the heat loss to the preheating of the gasified vapor and to the droplet vaporization process. The lifetime of liquid droplets can be predicted by the theory of single droplet vaporization. Results show that the complete vaporization time of liquid droplets increases with increasing initial droplet size but is very insensitive to the amount of liquid fuel, and that the ignition delay time in the gas mixture becomes longer with a larger amount of liquid fuel and a lower initial gas temperature.