Gas flow peculiarities in a semi-closed volume during the explosion of an elongated charge of a condensed explosive substance

Purpose. Confirmation of effect refinement of cord charge detonation during the simultaneous combustion of high-energy materials based on double-base propellants and artillery powders on the walls of a semi-closed volume. Methodology. To verify the results of previous experimental studies on features of important element of cord detonation engines, in particular the damper, the study used numerical flow simulation in a semi-closed volume according to the Navier-Stokes equations by the finite volume method in the SolidWorks application software package. In the initial area of the engine, the unsteady problem of extended charge detonation along a spiral was considered. Findings. Based on the detonation feature analysis of energetic materials in a semi-closed volume, the design of a detonation solid-fuel engine was refined and its application scope was set on depending on the starting mass. The energy characteristics of a solid-fuel detonation engine were determined taking into account the gasification process of pentaerythritol tetranitrate and double-base gun powder in different combustion modes. A significant impact of detonation products on the engine body has been revealed, which requires the protective shell using in the design or the removal of an extended charge to a certain distance Originality. It consists in establishing a significant impact of detonation products on the engine body, which requires modernization of the engine design. Practical value. The assessment of flow nature of reaction products of high-energy materials allows predicting the consequences of the process and preventing negative results during engine operation process. The determined characteristics and the behavior features of double-base gunpowder combustion products must be taken into account when working with rock, especially during blasting operations and crushing under significant pressure.