Studies of Dry-Powder Extinguishment of Diffusion Flames for Condensed Fuels

摘要

A powder delivery system for the extinction of diffusion flames of condensed fuels is studied. The main component of the delivery system is a glass elutriation vessel containing a bed of powder. The extinction experiments were conducted in counterflow flame geometry. A flat, laminar diffusion flame was produced in a stagnation-point boundary layer by directing an oxidizing gas stream downward onto the surface of a liquid fuel burning at atmospheric pressure. The extinction data can be used to extract overall activation energies and prefactors for the inhibition processes in one-step reaction rate approximations, perhaps ultimately leading to conclusions regarding chemical mechanisms for powder suppression.