Accession Number : ADA118394

Title :   A Comparison of Barrel-Heating Processes for Granular and Stick Propellant Charges.

Descriptive Note : Memorandum Rept. Jan-Jul 81,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Horst,Albert W

PDF Url : ADA118394

Report Date : Aug 1982

Pagination or Media Count : 27

Abstract : The natural flow channels offered by propelling charges composed of bundles of stick propellant significantly reduce the resistance to gas flow when compared to that of granular propellant charges, virtually eliminating potentially damaging pressure waves in the gun chamber. However, this same feature which reduces pressure waves may also result in more propellant remaining in the chamber, burning behind the origin of rifling, and perhaps increasing barrel erosion. In this study, a two-phase flow interior ballistic code (NOVA) is employed to compare propellant motion and heat transfer processes for ballistically-equivalent stick and granular propellant charges. A large difference in the motion of the solid phase during ignition and combustion is predicted for the two configurations, leading ultimately to an approximately 300 K higher maximum wall temperature for the stick propellant charge.

Descriptors :   *Gun propellants, *Interior ballistics, Gas flow, Heat transfer, Propellants, Gun barrels, Erosion, Gun chambers, Fluid flow, Hydrodynamic codes, Temperature

Subject Categories : Ammunition and Explosives
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE