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Recently, more and more researchers have shown interest in studying the temperature gradient of unconventional shots, including shots with a travelling charge. The paper considers the possibility of taking into account the effect of the initial charge temperature, in particular, on the travelling charge from the pasty propellant, in the form of a linear relationship, through the use of a mathematical tool for qualitative analysis of experimental data. A study was made of taking into account the influence of the temperature coefficient in one or several parameters characterizing the propellant combustion on the ballistic characteristics of the shot. It is shown that for pasty propellants, taking into account the temperature coefficient in the travelling charge dispersion rate and the layer-by-layer burning rate of dispersed propellant particles, as well as the dependence of the transition pulse to the accelerated TC burning mode on the initial charge temperature, provides good agreement on the shapes of pressure variation curves in the loading chamber and velocity projectile in the barrel. [ABSTRACT FROM AUTHOR]

As it was shown earlier in the authors works, powder propellant charge modernization is possible by using paste-like propellants as an upper semi-charge, used as a travelling charge to push the projectile in the barrel. Advantages of this technology is to increase a loading density and a propellant charge mass, and, consequently, to increase propellant charge energy. The use of this technology leads to a redistribution of the energy of combustion products in the projection space. In this paper, there is carried out a theoretical parametric study of the muzzle bullet velocity increasing possibility while maintaining maximum pressure using model paste-like propellants, under conditions of a Mosin rifle shot. Theoretical results obtained and analyzed. A comparison is carried out on the ballistic shot parameters of a classical loading scheme and a scheme with a combined propelling charge using model pasty propellants. [ABSTRACT FROM AUTHOR]

The problems of the defense industry occupy the most important place in the constantly developing modern world. The daily development of defense technology does not stop, nor do studies on internal ballistics. The scientists of the whole world are faced with the task of managing the main characteristics of a ballistic experiment. The main characteristics of the ballistic experiment are the maximum pressure in the combustion chamber Pmax and the projected velocity at the time of barrel leaving UM. During the work the combustion law of the new high-energy fuel was determined in a ballistic experiment for different initial temperatures. This combustion law was used for a parametric study of depending Pmax and UM from a powder charge mass and a traveling charge was carried out. The optimal conditions for loading were obtained for improving the initial velocity at pressures up to 600 MPa for different initial temperatures. In this paper, one of the most promising schemes of throwing is considered, as well as a method for increasing the muzzle velocity of a projected element to 3317 m/s. [ABSTRACT FROM AUTHOR]

The work presents opportunities of hydroballistic complex for studying the characteristics of movement supercavitation model (SCM) on the length of waterway to 10 m. Gunfire of SCM implemented by this complex allows to study movement and collision of the different masses of SCM with underwater obstacles at subsonic, transonic and supersonic velocities in water. During the movement of SCM different masses the behavior supercavity was investigated. [ABSTRACT FROM AUTHOR]