Abstract
This study is a numerical analysis on propagation behavior of a three dimensional detonation in a square tube and, influence on motion trajectories of high pressure region(shock triple points) due to the change of aspect ratio of tube was solved by a finite difference method which consists of the semi-implicit MacCormack method and TVD scheme in order to prevent numerical stiffness and Gibb's phenomena. Gas utilized in this computational study is the stoichiometric hydrogen and oxygen gas mixture. It was found from numerical results that Change in propagation mode can be explained from the relation between the geometric form of a section and the behavior of triple points. Moreover, it was shown that the instability of the propagation form and propagation mode may not be settled causing the aspect ratio of the section.
