Accession Number : ADA264193


Title :   Blast Field Contouring Using Upstream Venting


Descriptive Note : Final rept.,


Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS


Personal Author(s) : Carofano, G C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a264193.pdf


Report Date : Mar 1993


Pagination or Media Count : 177


Abstract : Modem cannon often employ vents in the tube wall near the muzzle as a lightweight brake. While all brakes reduce weapon impulse at the expense of increasing blast upstream, this type affords some opportunity to contour the blast field. Normally, the vents are clustered at the muzzle, but calculations indicated that relocating some upstream could reduce blast levels near the breech without compromising weapon impulse or projective velocity. Laboratory experiments using a 20-mm cannon showed a reduction of 4 to 5 dB, as predicted. However, field experiments with a 105-mm cannon showed no beneficial effect of upstream venting. The presence of the ground plane in the latter is believed to be the reason


Descriptors :   *AMMUNITION , *BREECH MECHANISMS , *INTERIOR BALLISTICS , *GUN MUZZLES , VELOCITY , PROJECTILES , OVERPRESSURE , BLAST LOADS , TUBE LAUNCHED , VENTING , GUN PROPELLANTS , BRAKES , EULER EQUATIONS , GAS DYNAMICS , FLOW FIELDS , PRESSURE


Subject Categories : Guns
      Ballistics


Distribution Statement : APPROVED FOR PUBLIC RELEASE