Abstract
Behaviors of flame propagation in a detonation tube were observed by a high-speed video camera in order to clarify the effects of rapid flame propagation in a vortex flow on DDT. The flame speeds near the wall of the detonation tube are faster than those at the central part of the tube. The flame is accelerated between the first half part and the latter half part of the observation windows due to a turbulence which is generated at the ramp between the first half part and the latter half part of the windows. The flame speeds show nearly constant value even when the rotating velocity is increased, thus the effects of rapid flame propagation in the vortex flow on DDT is not observed.
