Propagation mechanism of non-steady gaseous detonation

The propagation mechanism of two and three-dimensional detonation waves in a tube with and without obstacles are systematically investigated using Euler equations and two-step chemical reaction model as the governing equations for hydrogen-oxygen detonation. For this purpose, numerical simulation methods are employed using fifth order "Weighted Essentially Non-Oscillatory" (WENO) scheme in multi-space dimensions and the third order Runge-Kutta in time dimension. The cellular pattern formation mechanism and re-initiation phenomenon of two-dimensional detonation in a tube with and without obstacles are obtained, and the transformation mechanism between diagonal and rectangular modes of three-dimensional detonation wave is explored. Numerical results show that the triple wave structure of detonation wave plays a vital role in the self-sustaining propagation of non-steady detonation wave. These results provide important grounds for exploring the propagation mechanism and for controlling detonation formation.