Abstract The primary objective of this paper is to study the detonation re-initiation through multiple reflections upon its entry into a confined space containing liquid fuel within a flow system, which holds significant implications for two-phase pulse detonation engines (PDE) and rotating detonation engines (RDE). Utilizing the Eulerian-Lagrangian method, this study investigates the disparities in the diffraction, quenching, and re-initiation processes of liquid n-heptane/air detonation upstream and downstream. Additionally, it explores the interaction between shock waves and droplets as well as determines the lean flammability limit for re-initiation within a flow system. The findings suggest that the incoming flow significantly contributes to the upstream decoupled detonation re-initiation, as it intensifies the leading shock, thereby expediting droplet fragmentation and evaporation. However, the compressive effect of the incoming flow is insufficient to initiate upstream detonation independently. To achieve re-initiation, it is still necessary for the detonation wave to be reflected by the wall. Moreover, the incoming flow expands the re-initiation boundaries, thereby facilitating the re-initiation of upstream detonation. As the equivalence ratio decreases, a higher inflow Mach number is required to achieve upstream re-initiation.

    Highlights Upstream and downstream detonation re-initiation are compared. Interaction between droplets and leading shock upstream and downstream are illustrated. The detonation re-initiation boundaries beneath an incoming flow are found.


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    Title :

    Effect of incoming flow on the detonation re-initiation in liquid n-heptane/air mixtures


    Contributors:
    Jiang, Chao (author) / Pan, Jianfeng (author) / Zhu, Yuejin (author) / Fan, Baowei (author) / Lu, Qingbo (author) / Nauman, Muhammad (author)

    Published in:

    Acta Astronautica ; 218 ; 102-113


    Publication date :

    2024-02-18


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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