Accession Number : ADP009060

Title :   Experimental Determination of Bore Evacuator Hole Flow Coefficients, Tube to Cannister.

Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY CLOSE COMBAT ARMAMENTS CENTER

Personal Author(s) : Sneck, H. J.

Report Date : SEP 1993

Pagination or Media Count : 10

Abstract : The flow-rate of the propellant gases from the gun tube through the bore evacuator holes controls the cannister charging process and determines the maximum pressure available for tube evacuation. In an attempt to model this complex flow in simple mathematical terms the holes are often treated as orifices. Formulations of this type introduce dimensionless orifice coefficients which are intended to embody the collective effect of the details of the actual flow. The determination of these coefficients is the central issue in the modeling. They are expected to vary with changes in the hole configuration, fluid properties and gross measures of the fluid motion. There have been a few attempts to predict these coefficients analytically, and even fewer to determine them experimentally. The results presented here are a modest attempt to extend the empirical database and verify previous mathematical predictions.

Descriptors :   *EXHAUST SYSTEMS, *EXPLOSION GASES, *ARTILLERY, BORES, COEFFICIENTS, CONFIGURATIONS, CONTROL, DATA BASES, DETERMINATION, EVACUATION, FLOW RATE, FORMULATIONS, GUNS, MODELS, MOTION, ORIFICES, PRESSURE, RATES, MATHEMATICAL PREDICTION, PERFORATION, GUN BARRELS, GUN CHAMBERS, WASTE GASES, COMBUSTION CHAMBER GASES, MATHEMATICAL ANALYSIS.

Subject Categories : Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE