Simulations of both inert mixing and sustained combustion are analyzed for a cavity flameholder based on corresponding experiments. An M = 1 round ethylene jet fuels a cavity with length-to-depth ratio L / D = 3.5 and a 45° inclined downstream wall. Oxidizer mixes into the cavity from the M = 3 core flow. The simulations reproduce shock angles and wall pressures of the corresponding experiment. The effects that cavity combustion has on the core-flow gas dynamics and cavity entrainment are analyzed in detail. Relative to the inert case, heat release leads to a complex core flow, with upstream boundary layers transiently separating and highly unsteady shocks over the cavity. Their collective effect is the formation of a virtual throat, which decreases the core flow to M = 2 above the cavity. Lagrangian trajectories assess the roles that turbulence, combustion, and three-dimensional side-wall boundary layers have on oxidizer entrainment into the cavity. Overall, sustained cavity combustion suppresses entrainment by a factor of about 2.


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    Title :

    Flow and Combustion in a Supersonic Cavity Flameholder



    Published in:

    AIAA Journal ; 60 , 8 ; 4566-4577


    Publication date :

    2022-05-16


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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