CJ Detonation Structure -3D Rectangular Tube Case-

摘要

An unsteady three-dimensional simulations are performed for hydrogen/air CJ detonation in a rectangular tube, where a detailed reaction model is used to reveal its structure. The simulations clearly show detailed three-dimensional detonation modes: a rectangular mode and a diagonal mode. It turns out that the rectangular mode consists of 2 two-dimensional waves and that its cell length is approximately equal to that of the two-dimensional simulations. The diagonal mode is shown to be a three-dimensional diagonal motion of the lines of the triple points completely. The cell length of the diagonal mode is about 3/4 of those obtained in the two-dimensional and other three-dimensional simulations. The detonation front for both rectangular and diagonal modes becomes various and complicated three-dimensional pattern, and the three-dimensional simulations agree well with the results of the experiments reported by many researchers. Furthermore, the formations of unreacted pockets and vortex rings behind the detonation are captured for the diagonal mode.