Uticaj promene gasodinamičkih karakteristika barutnih gasova na intenzitet natpritiska primenom specijalnih gasnih uređaja oružja

Abstract

This doctoral dissertation presents the theoretical models of the shock wave overpressure powder gases propagation around the weapon barrel. Analytical and numerical mathematical models have been defined. These models describe the physical phenomena of wave propagation based on acoustic and gas dynamic principles. Based on the mathematical models, electro-acoustic analogy and CFD techniques, the appropriate computational models for simulation of the shock wave propagation and monitoring of the overpressure value in the field around the firearm barrel with and without special gas devices have been created. The changes of the primary gas dynamic parameters in the defined spatial points in relation to the wave source or the last section of the gun barrel have been determined by the simulation models. Experimental tests were performed on a real model by registering the shock wave overpressure changes in the defined spatial points. In addition to the primary parameter monitoring, the impact of silencer to change of the projectile initial velocity was measured. The comparative analysis of the calculations and experimental results has provided the qualitative assessment of simulation models. In addition, possible applications of the simulation models in design of new weapon gas devices have been defined, with remarks on additional checks and possible modifications. The research performed in this paper has yielded an optimized mathematical model and optimized numerical techniques based on the unsteady RANS multiphase model for simulation of the main shock wave gunpowder gas parameters during the firing process. The numerical simulation model has been used to visualize the process and thus illustrate the real physical process of the shock wave propagation.