Modelling the behaviour of additives in gun barrels
Abstract
A mathematical model which predicts the flow and heat transfer in a gun barrel is described. The model is transient, twodimensional and equations are solved for velocities and enthalpies of a gas phase, which arises from the combustion of propellant and cartridge case, for particle additives which are released from the case; volume fractions of the gas and particles. Closure of the equations is obtained using a twoequation turbulence model. Preliminary calculations are described in which the proportions of particle additives in the cartridge case was altered. The model gives a good prediction of the ballistic performance and the gas to wall heat transfer. However, the expected magnitude of reduction in heat transfer when particles are present is not predicted. The predictions of gas flow invalidate some of the assumptions made regarding case and propellant behavior during combustion and further work is required to investigate these effects and other possible interactions, both chemical and physical, between gas and particles.
 Publication:

In AGARD Interior Ballistics of Guns 11 p (SEE N8629063 2031
 Pub Date:
 January 1986
 Bibcode:
 1986ibg..agar.....R
 Keywords:

 Additives;
 Cartridges;
 Guns (Ordnance);
 Interior Ballistics;
 Prediction Analysis Techniques;
 Propellant Combustion;
 Structural Design;
 Computerized Simulation;
 Geometry;
 Heat Transfer;
 Mathematical Models;
 Turbulence Models;
 Wear Inhibitors;
 Fluid Mechanics and Heat Transfer