A New High-Progressivity/High-Density Propulsion Concept: Partially Cut Multiperforated Stick Propellant
Final rept. Jan-Oct 1987
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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This report presents the results from investigations with a high- progressivehigh-density HPD propelling charge concept using partially-cut, multiperforated stick propellant. While multiperforated stick propellant is attractive both for its progressivity and loading density, the internal pressurization of the long, unvented perforations is of considerable concern. Such internal pressurization may result in mechanical failure of the grains, exposing unprogrammed burning surfaces and leading to overpressurization of the chamber. In the partially cut configuration, the perforations are vented via cuts made through the perforations perpendicular to the axis of the grain at periodic locations along the axis. In order for the partial cutting to be effective, the spacing of the cuts must take into account the diameter of the perforation and the burning rate of the propellant in the perforation.
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