Accession Number : ADP009061

Title :   Pressure Distribution and Pumping Force of Discharging Bore Evacuator Holes,

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

Personal Author(s) : Sneck, H. J. ; Rivera, Mario

Report Date : SEP 1993

Pagination or Media Count : 18

Abstract : Bore evacuator holes are angled toward the muzzle end of a gun tube so that the small jets created during the evacuator discharge will entrain bore gases, forcing them to move toward the muzzle. A control volume analysis of the gas in the tube with an open breech shows that the only force acting in the direction of the muzzle occurs at the nozzle entrance to the tube. The pressure distribution at the nozzle entrance is investigated theoretically and experimentally in this paper. An empirical method of calculating the nozzle pumping force component is presented for 30 deg, 45 deg and 60 deg nozzle angles.

Descriptors :   *PUMPING, *EXHAUST SYSTEMS, *EXPLOSION GASES, *ENTRAINMENT, *GUN BARRELS, ANGLES, CONTROL, NOZZLES, PRESSURE DISTRIBUTION, ARTILLERY, BACK PRESSURE.

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE