Characteristics of flame propagation in a vortex flow in DDT

Abstract

Behaviors of flame propagation were observed by a high-speed video camera and the flow velocity in a detonation tube was measured in order to clarify the effects of a vortex flow on flame propagation in the process of deflagration-to-detonation transition (DDT). The flame near the tube wall is propagated faster than that near the central axis of the tube, because the axial velocity near the tube wall is faster than that at the central axis of the tube. The flame velocities show a constant value even when the circumferential velocity at the inlet of the mixture is increased. The effects of a vortex flow on flame propagation in the process of DDT, however, were not observed.