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Detailed Characterization of the Interior Ballistics of Slotted Stick Propellant

机译：开槽棒推进剂内弹道的详细表征

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While classical, lumped-parameter modeling of granular propellant gun firings is often quite successful at reproducing experimental data, a similar treatment of stick propellant firings typically yields somewhat lower pressures and muzzle velocities than actually experienced in the gun. To identify those processes responsible for this behavior, a set of highly-instrumented gun firings has been performed in a 155-mm howitzer, using both stick and granular propellant charges. To simplify the investigation as well as to facilitate the analysis, a slotted, single-perforated stick propellant was employed, and the granular propellant was prepared simply by cutting some of the sticks to a shorter length. Firings of the two types of charges yielded the same muzzle velocities, but with the stick charges operating at a 4% lower maximum chamber pressure. Detailed analysis of pressure versus time and travel profiles, obtained using fixed and on-board pressure instrumentation, along with concurrent multiphase flow (NOVA) simulations of the event, suggest two major contributors to the unexpected performance of the stick propellant charges. The first is an artificial progressivity resulting from higher post-peak chamber pressures associated with the more localized burning of the stick propellant (vis that of the longitudinally distributed, fluidized bed of granular propellant). The second is a hydrodynamic effect resulting from the non-Lagrangian pressure and velocity profiles exhibited by a stick propellant charge, again ultimately associated with the grossly discontinuous distribution of the burning stick propellant as opposed to the more continuous distribution of the granular propellant throughout most of the tube.

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