Accession Number : ADA195081

Title :   Flamespreading Processes in Obliquely Loaded Stick Propellant Beds.

Descriptive Note : Technical rept. Oct 85-Sep 86,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Minor, Thomas C

PDF Url : ADA195081

Report Date : Mar 1988

Pagination or Media Count : 30

Abstract : Stick propellants have seen increasing use in recent years, in part because the small resistance to the flow of ignition and early combustion gases presented by the packed stick bundle allows the use of simplified, base ignition systems. The resistance to gas flow along the axial dimension is approximately two orders of magnitude lower for a stick propellant bed than for a granular one. However, in the real world of propellant charges, conditions arise in which the flow of gases might attack the stick bundle obliquely rather than along its axis. Such situations might include propellants contained in cases in a manner that the sticks can become shifted or twisted to some degree of obliquity either during the loading process or during handling prior to firing. A similar situation might arise with a central primer venting into a stick bed, in which case the flow might be perpendicular to the axis of the sticks. Clearly, to varying degrees the picture of nearly resistanceless flow within the bed does not apply in these cases. Keywords: Interior ballistics, Artillery propelling charges, Stick propellants, Flamespreading, Guns, Gun propellants, Flow resistance.

Descriptors :   *ARTILLERY AMMUNITION, *COMBUSTION PRODUCTS, *INTERIOR BALLISTICS, *PROPELLING CHARGES, *PROPELLANT GRAINS, EXPLOSIVE CHARGES, GAS FLOW, GASES, GUN PROPELLANTS, GUNS, IGNITION, IGNITION SYSTEMS, PRIMERS, PROPELLANTS, VENTING, BURNING RATE

Subject Categories : Ammunition and Explosives
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE