Soloviev

The study of aerodynamics of bodies that received permanent deformation in the process of movement is a very important task. The authors developed an efficient matrix method for describing the geometry of bodies with an arbitrarily curved axis; this method was used as the basis for creating a general method for calculating aerodynamic characteristics of such bodies; this general technique is based on the physical "Newtonian inhibition" hypothesis. This approach allows to calculate not only aerodynamic but inertial characteristics of curved bodies; also it can serve as a basis for formation of a combined method of deformed bodies with head and tail surfaces.

The authors present a review of works dealing with the problem of shock explosive initiation; this review covered shock pulses administered by a single high-speed penetrator or by a flow of several penetrators. Expressions describing particular cases of interaction between an explosive charge and two high-speed penetrators are included in the article. Feasibility of numerical simulation was asserted to be the principal research technique for studying such high-speed processes. Different numerical setups using the AUTODYN 2D and 3D hydrocode are considered. Reasons behind planar symmetry used in a two-dimensional setup are included in the article. The authors show good agreement between the results obtained using two-dimensional setup with planar symmetry and results obtained during three-dimensional numerical runs.

The authors show the possibility of simple analytical evaluation of properties of multicomponent explosive mixtures with known properties and weight percentage of components. Expressions that expand the applicability of additivity laws were obtained from known shock wave theory relations for specific volume, density, isentrope exponent, explosive heat, detonation speed of explosive mixture. The authors provide a technique of calculation of detonation properties of explosive mixtures for a general multicomponent explosive, for two-phase medium and for a mixture of explosive and inert additive. An analytical shock adiobatic curve of a multicomponent explosive could be easily derived from the obtained results. This may be particularly useful for estimation of detonation process behavior in explosive mixtures when there is no experimental data concerning their particular properties.

The article deals with the effects of non-ideal initiation and propagation of detonation in the equipment of weapons and ammunition, the basics of principles of operation of which is directed detonation-wave transmission of the explosion energy of charges of condensed explosives. The main causes of these effects and their influence on the functioning of explosive devices are analyzed. The data on the degree of influence of this factor on the stability characteristics of the damaging effect of modern high-performance ammunition was offered for cumulative and shell forming types, designed to destroy armored vehicles at long range.

Technology imperfections, operational and functional affects on high explosive charges of projectiles and ammunitions cause birth structural defects. Influence mechanisms of compact and flat local defects on the evolution of detonation wave were studied with the help of computational fluid dynamics method. Amplitude of detonation wave front deformations in relation to the compressible behavior of point defects and cracks with different orientations was calculated.

Studying aerodynamics of bodies which received irreversible deformations in the process of motion is an extremely urgent task today. The authors analyze the approaches used in studying flow around elongated bodies at high angles of attack. The authors provide a general formula for a body with constant curvature of direct axis. The authors give primary attention to the description of original experimental studies of flow near a curved body at supersonic speeds. The results of the visualization of flows and drainage studies are given. The authors justify the proposals on modifications of the Newton theory of flow and other theories for creating a method of calculating aerodynamic characteristics of random deformed bodies.