The problem of detonation initiation in a supersonic flow of a stoichiometric propane-air mixture occupying partially or completely the cross-section of a plane channel is considered. The initiation in the flow is produced by a step or a wall completely cutting off the flow. The study is conducted within the framework of one-stage combustion kinetics. A numerical method based on the Godunov scheme is employed. The critical conditions for detonation formation are determined in terms of the oncoming flow velocity. A previously unknown mechanism of detonation propagation is found. The problem of detonation initiation in a supersonic flow of propane-air mixture in a plane channel with bends and constant cross-section area is considered. The detonation occurs due to curvature of the channel. The critical flow velocity and angle of rotation separating different flow regimes (including stationary with detonation) are determined.
|
