Accession Number : AD0615081

Title :   THE CONSTANT ACCELERATION GAS GUN PROBLEM,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Winkler,Ernst H.

Report Date : 15 AUG 1964

Pagination or Media Count : 123

Abstract : An analytical study of the constant acceleration gas gun problem was made. It is shown that a necessary and sufficient condition exists which the propellant flow in the gun barrel must fulfill in order to maintain a constant pressure at the base of the projectile. The particular flow phenomenon which fulfills the required condition is characterized by the absence of any relative variation of flow velocity. The whole flow then is in a state of constant acceleration. The governing equation of this constant acceleration flow and the gradients which exist in it are derived. The conditions which must be produced in the gun chamber to generate a constant acceleration flow have been evaluated and the limitations imposed on its production are determined. A comparison is made of the pressure-time relation obtained from a free piston compressor and the required p-t relation to produce a constant acceleration flow. Various modifications of the pump chamber of a two-stage gun are investigated in order to determine the most suitable modification by which a constant acceleration gun can be realized. (Author)

Descriptors :   (*LIGHT GAS GUNS, ACCELERATION), (*HYPERVELOCITY GUNS, ACCELERATION), HYPERVELOCITY PROJECTILES, PROPELLANTS, FLUID FLOW, COMPRESSORS, DIFFERENTIAL EQUATIONS, INTEGRALS

Distribution Statement : APPROVED FOR PUBLIC RELEASE