Numerical study of detonation waves in a monofuel-gas mixture in sharply expanding pipes

Mathematical simulation of the propagation mechanisms of combustion waves and heterogeneous detonation in sharply expanding pipes was performed using the equations of two-dimensional axisymmetric unsteady motion of a reacting mixture of a gas and monofuel particles. The influence of the main determining parameters of the gas-particle mixture and the pipeline on the propagation of nonstationary detonation waves was studied. Dependences of the critical ratio of the pipe diameters of the composite pipeline on the relative mass content of monofuel particles of different sizes are given.     

Numerical simulation of inviscid flows with hydrogen combustion behind shock waves and in detonation waves

A new numerical algorithm for simulation of nonequilibrium chemically reacting flows of an inviscid multicomponent gas is described. Application of this algorithm to the numerical solution of several problems of air-hydrogen mixture combustion in oblique detonation waves is demonstrated.Zhukovskii Central Aerodynamic Institute, Zhukovskii 140160. Translated from Fizika Goreniya i Vzryva, Vol. 31, No. 3, pp. 118–133, May–June, 1995.     

Numerical study of detonation in CH4 (H2) + air mixtures behind shock waves

A comparative analysis is performed of the variation of the gas-dynamic parameters and of the dynamics of formation of nitrogen-containing components during combustion ofCH ₄ + air andH ₂ + air mixtures in supersonic flow behind a shock wave. The sizes of the induction and combustion zones at different initial values of the Mach number of are calculated and the possibility of reduction of the kinetic scheme in describingCH ₄ + air detonation behind a shock wave is considered.Translated from Fizika Goreniya i Vzryva, Vol. 32, No. 1, pp. 94–110, January–February, 1996.     

Radiographic study of interaction of shock and detonation waves in a high explosive

Collisions of shock and detonation waves in an HMX-based high explosive are experimentally studied with the use of flash radiography. Based on X-ray patterns, specific features of the wave-interaction process are identified, and qualitative differences are found in detonation formation and evolution in an explosive precompressed by a weak shock wave and in an undisturbed explosive. __________ Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 3, pp. 132–138, May–June, 2007.     

Structure of detonation waves in PETN

A VISAR technique was used to study the structure of the reaction zone in PETN for various initial densities and dispersion of samples. The flow in the pressed charges corresponds to the classical denotation model. In the case of bulk density, the peculiarities corresponding to an explosive combustion model are recorded. In the vicinity of the initial density of 1.7 g/cm³, a kink is found on the curve showing detonation velocity versus density, and the shock-wave initiation of PETN above and below the kink point is studied.     

Numerical study of heat waves in the oxidation of a magnesium wire

A mathematical model of ignition of magnesium samples is proposed based on the concept of the existence of thermal deceleration of a chemical reaction responsible for ignition. The model gives realistic values of temperatures after sample ignition and is in satisfactory agreement with experimental data on the dependence of the radius of a small particle on the limiting temperature of the ambient medium. It is shown that heat waves can be excited by heterogeneous oxidation of Mg wire located in the external flow. The range of parameters in which self-excited wave regimes are observed fits experimental data on oxidation of metal wires qualitatively and in order of magnitude. The problem of initiation of an ignition wave by the initial distributions of the sample temperature is solved numerically, and the stability of heat waves to small and finite perturbations is shown. Tranlated fromFizika Goreniya i Vzryva, Vol. 34, No. 6, pp. 29–38, November–December 1998.     

Numerical modeling of the detonation of a submerged hydrogen-air jet

Moscow. Translated from Fizika Goreniya i Vzryva, Vol. 26, No. 4, pp. 110–116, July–August, 1990.