Two-Dimensional Modeling of Flame Propagation in Fuel Stream Arrangements.

摘要

In an effort to provide a useful simplified model of flame initiation and propagation in a spray arrangement consisting of several droplet streams injected in a gas flow, this work analyzes a two-dimensional heterogeneous flow between parallel walls in which the droplet streams are represented by parallel droplet sheets of specified inlet droplet number density and velocity. Thermal expansion of the gas flow is partly considered by allowing for the streamwise acceleration of the gas as the heat released by the chemical reaction increases the gas-phase temperature. The results indicate that ignition is dependent on local conditions only, although the overall efficiency of the reaction process may be a function of the general geometry of the system. A number of distinct reaction zones are shown to exist in different parts of the flowfield, indicating that the assumption of a unique flame front propagating throughout the mixture may be too simplistic. Premixed-type flames and diffusion-type flames are generally observed and various levels of interaction between them are possible. Spray combustion, Flame propagation, Reprints, Fuel sprays, Combustors, Fuel air ratio, Liquefied gases. (jg)