An experimental study of the diffraction and re-initiation of detonations in divergent channels in was reported in this paper. Both smooth and porous divergent walls were used in this study. Two re-initiation modes, termed re-initiation from expansion wave front and lower wall, were detected. Two kinds of transverse detonations were observed, one propagating toward the lower wall () and the other toward the top wall (). For re-initiation from the expansion wave front, the re-initiation is due to and the influence of the wall condition can be ignored. For re-initiation from the lower wall, the re-initiation is mainly due to the Mach stem and . The reflection point distance for re-initiation from the lower wall is (smooth wall) or (porous wall) ( is the detonation cell size). The delay initiation over a porous wall is ascribed to the diffraction of Mach stem detonation. Three collision modes of re-initiation from the lower wall were determined based on the collision between and , i.e., subcritical collision as , critical collision as , and supercritical collision as ( is inlet channel width). The collision point distances are approximately for the smooth wall and for the porous wall.
Detonation Diffraction in Divergent Channels with Smooth and Porous Walls
AIAA Journal ; 1-9
2025-04-01
Article (Journal)
Electronic Resource
English
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