Abstract
Detonation is a combustion wave that propagates at the supersonic speed in a stationary reactive mixture in the form that consists of a precursor shock wave and a reaction region induced by the shock. In addition, the detonation front is known to have shock triple points which are composed of an incident shock, reflected shock and Mach stem shock. In this study, a one-dimensional detonation was analyzed at first. Second, the three-dimensional detonation at a rectangular tube was analyzed in the moving coordinate system, using the one-dimensional result as an initial condition. And last, the three-dimensional detonation propagating in the tube with a right corner was analyzed in the stationary coordinate system, using above-mentioned three-dimensional results as the part of initial condition. The results of this study are as follows: Results due to a change of coordinate system are no large difference, but the detonations in over-driven condition propagate a short while at the start of calculation. When the detonations propagate into a large space, its configurations collapse by the Prandtl-Meyer expansion and the long induction length. When the detonation propagates into a narrow space, part of the triple points disappear once, but its configuration re-generates by interference with the reflected wave and collisions with the wall. No large differences are shown on results of the propagation behavior due to location of the triple points just before diffraction.
