Accession Number : ADP001027

Title :   Two-Phase Flow of Liquid Propellant Guns by Space Mean Approach,

Corporate Author : ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ FIRE CONTROL AND SMALL CALIBER WEAPON SYSTEMS LAB

Personal Author(s) : Yalamanchili,Rao

Report Date : FEB 1983

Pagination or Media Count : 11

Abstract : Liquid propellants have many potential advantages over solid propellants for use in guns, including elimination of cartridge cases, reduced gun tube erosion, and higher muzzle velocities. However, in the past, nonreproducibility of ballistics was the main obstacle. An accurate mathematical model is essential to characterize and predict the interior ballistics of a liquid propellant gun in order to overcome this obstacle. A regenerative injection model is considered where the force derived from the combustion of a small portion of the propellant and differential-area piston is utilized to inject the main charge into the chamber. The model involves a compressible liquid, injection fluid mechanics and the burning rate of propellant in addition to an imperfect gas law. The continuity, momentum and energy equations are utilized in addition to two moving boundary conditions which are formulated by Newton's law. These are solved by numerical integration and digital computers. Model capability includes not only conventional interior ballistics results but also the rate of propellant injection, the rate of propellant combustion as well as propellant distribution inside the chamber. (Author)

Descriptors :   *Mathematical models, *Interior ballistics, *Liquid gun propellants, *Two phase flow, Differential equations, Guns, Numerical integration, Digital computers, Burning rate, Injection, Fluid mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE