Accession Number : ADA195173

Title :   One-Dimensional Modeling of Liquid Injection in a Regenerative Propellant Gun.

Descriptive Note : Technical rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Coffee, Terence P

PDF Url : ADA195173

Report Date : Mar 1988

Pagination or Media Count : 62

Abstract : The experimental data from a 30-mm regenerative liquid propellant gun has been analyzed. The injection of the liquid propellant into the combustion chamber is usually modeled as steady state Bernoulli flow with a fixed discharge coefficient. However, the data analysis indicates that the discharge coefficient increases slowly to approximately a steady value. To explain this phenomenon, a series of codes have been developed to model the injection process. These are a zero-dimensional (lumped parameter) model (LPIN), a one-dimensional model (ODIN), and a two-dimensional model (MAGIC). For a simple test problem, the three codes are in reasonable agreement. The two-dimensional code is currently under development, and cannot presently model the large area changes typical of an inline regenerative propellant gun. The zero-dimensional and one-dimensional codes have been applied to an injector resembling that of an actual gun fixture, and agree closely for this case. However, they predict a rapid rise to a steady value. Preliminary indications are that the two-dimensional code will give similar results. The models do not agree well with the data obtained from the experimental gun firings. Once the two-dimensional model is fully functional, the agreement may improve. But it appears that other phenomena not included in the model are important. Keywords: Computational fluid dynamics; Transient flow; Fuel injection; One-dimensional modeling; Discharge coefficient; Liquid flow; regenerative gun.

Descriptors :   *GUNS, *LIQUID PROPELLANTS, CODING, COEFFICIENTS, COMBUSTION CHAMBERS, COMPUTATIONS, DATA PROCESSING, EXPERIMENTAL DATA, FLOW, FLUID DYNAMICS, FUEL INJECTION, GUNFIRE, INJECTION, LIQUIDS, MODELS, ONE DIMENSIONAL, PARAMETERS, REGENERATION(ENGINEERING), STEADY STATE, TEST AND EVALUATION, TRANSIENTS, TWO DIMENSIONAL

Subject Categories : Ammunition and Explosives
      Guns

Distribution Statement : APPROVED FOR PUBLIC RELEASE