Flame Acceleration under Conditions of Boundary Layer Instability Development

Flame acceleration in an acetylene-oxygen-nitrogen mixture in a channel due to the formation of a vortex flow on the boundary layer scale is studied numerically. The simulation is carried out using the complete system of gas dynamics equations for a reacting medium, taking into account the reduced mechanism of combustion kinetics in a setup simulating the gas flow in a channel by specifying the motion of the side walls. It is shown that when the flow regime changes from stable to unstable, an exponential increase in the flame propagation velocity occurs. The results obtained in this paper qualitatively describe the relationship between the instability of the boundary layer and the flame evolution scenario in the channel.