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Ignition-Induced Flow Dynamics in Bagged-Charge Artillery
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Over recent years a number of efforts have been undertaken to develop interior ballistics models capable of treating ignition-induced, two-phase flow dynamics in gun chambers. A coincidental requirement was thus generated for experimental data usable for validation of such models. While data have been provided in the past on flame-front propagation as well as pressure- wave development in cased-ammunition guns, no direct information on flames spread in bagged charges was available. The initial confinement of the propellant bed and ignition species imposed by the bag, followed by allowable gas and solid phase mobilities in radial as well as axial directions upon bag rupture, could have a major impact on flamespread and flow dynamics during the early portion of the interior ballistic cycle. Such processes might significantly affect the usefulness of existing two-phase flow models formulated under an assumption of one-dimensional flow. Data are presented which reflect the recent results of efforts to characterize flame-front propagation, propellant-bed mobility and pressure-wave development in bagged charges. Some experimental results are compared to numerical simulations, and inferences are drawn both about the adequacy of the models and about the basic phenomenology of bagged-charge performance.
APPROVED FOR PUBLIC RELEASE