Flame Stability in a System with Counterflow Heat Exchange

摘要

Propagation of two flame fronts in a mixture of gases in adjacent channels with oppositely moving gas flows is described within the framework of a one-dimensional model.Stationary solutions of the problem are constructed,and their stability to small perturbations is examined.The ranges of problem parameters (level of heat losses,composition of the mixture,gas-flow velocity,etc.) that allow flame stabilization are found.Conditions for flame oscillations are identified.It is shown that extremely lean mixtures of gases can burn in such a system,even if the channel diameters are smaller than the critical value corresponding to the initial temperature.