Calculated Gun Interior Ballistic Effects of In-Depth Burning of VHBR (Very High Burning Rate) Propellant
Technical rept. Jun 1988-Jun 1989
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Very High Burning Rate VHBR propellants exhibit sufficiently high burning rates to motivate consideration of a charge consisting of single- perforated monolithic grain. If the outside surfaces, including the ends, of such a grain were inhibited, the result would be a highly progressive grain whose performance could be quite attractive. The VHBR picture is complicated, however, by the fact that some of these propellants seem to burn not only on the surface but also at some depth into the surface, so that they have an extended reaction zone. This paper details the development of a lumped parameter interior ballistic code which permits an examination of the ballistic effects of in-depth propellant combustion. It is concluded that if in-depth burning occurs in a reproducible manner, and if the grain is properly designed so that it is fully burned at the time of shot ejection, then the performance improvement over that expected from a conventional charge for the same gun is significant. Monolithic charge, In-depth burning.
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