An experimental study of the diffraction and re-initiation of detonations in divergent channels in 2 H 2 + O 2 + 3 Ar 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 ( TD L ) and the other toward the top wall ( TD T ). For re-initiation from the expansion wave front, the re-initiation is due to TD L 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 TD T . The reflection point distance for re-initiation from the lower wall is 4 λ (smooth wall) or 11 λ (porous wall) ( λ 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 TD L and TD T , i.e., subcritical collision as 2 l c / λ < 10 , critical collision as 2 l c / λ = 10 , and supercritical collision as 2 l c / λ > 10 ( l c is inlet channel width). The collision point distances are approximately 10 λ for the smooth wall and 16 λ for the porous wall.


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    Title :

    Detonation Diffraction in Divergent Channels with Smooth and Porous Walls


    Contributors:
    Zhou, Zhen-Yang (author) / Ma, Hong-Hao (author) / Wang, Lu-Qing (author) / Yuan, Fei (author)

    Published in:

    Publication date :

    2025-04-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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