Evolution of the Boundary Layer in a Channel During Nonstationary Combustion of a Gas Mixture

The article presents the results of the computational and theoretical analysis of the mechanisms of formation of a vortex flow during flame propagation in a channel filled with a combustible gas mixture. It is shown that at the initial stage of combustion development the flow formed in the near-wall region can be described in accordance with the Blasius boundary layer theory. It is established that the nonstationary nature of flame evolution leads to disturbance of the boundary layer and that under certain conditions the development of the boundary layer instability determines the formation of vortex structures ahead of the flame front. In such a case, depending on the composition of the combustible gas mixture, stable flow regimes without the formation of vortex structures and regimes with flow stabilization are possible.