Two main understandings about Mach reflection of cellular detonation wave have been identified in this study. One is that the trajectory of Mach triple point does seem to follow the three-shock theory except for initial propagation of Mach stem near the beginning of wedge. Another is the effect of track angle and the angle of Mach triple point on the trajectory of Mach triple point. With increasing of the track angle or the angle of Mach triple point, the ratio of the trajectory of Mac triple point over cell size λ decreases.
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