Critical energy of bubble detonation wave initiation by a wire explosion

Initiation of bubble detonation by a short shock wave generated by exploding a wire located in a chemically active bubbled medium is studied experimentally. Critical energies of detonation initiation are determined for different volume fractions of bubbles. It is demonstrated that this method of initiation transforms the compression wave to a detonation wave at a length of ≈0.3 m. In the case of a wire explosion in a gas-liquid medium, the critical energy of bubble detonation initiation can be reduced by more than two orders of magnitude, as compared with initiation by a gas detonation wave.     

Damping of plane waves generated in an explosion medium during realization of undercompressed detonation modes

Moscow. Translated from Fizika Goreniya i Vzryva, Vol. 25, No. 3, pp. 102–108, May–June, 1989.     

Energy limits for the existence of detonation waves in bubbly media

The detonation waves in single- and multicomponent bubbly media were investigated experimentally. Data were obtained on the critical conditions for the initiation, the structure and properties of the detonation waves. Energy limits were established and the existence regions were determined for the detonation waves in the investigated systems.M. A. Lavrent'ev Hydrodynamics Institute, Siberian Section, Russian Academy of Science, 630090 Novosibirsk. Translated from Fizika Goreniya Vzryva, Vol. 30, No. 1, pp. 86–91, January–February, 1994.     

Protection of an explosion chamber against fracture by a detonation wave

The results of numerical simulation of the protective properties of layered and porous shields that are used to reduce peak stresses and to prevent failure of the walls of an explosion chamber under detonation loading are presented. It is shown that porous shields have stronger protective properties than layered shields of the same thickness. Institute of Applied Mathematics and Mechanics, Tomsk 634050. Translated from Fizika Goreniya i Vzryva, Vol. 33, No. 1, pp. 131–137, January–February, 1997.     

Bubble detonation in polydisperse media

Detonation waves in polydisperse bubble media have been studied experimentally. Data on the critical initiation conditions and on the structure and properties of detonation waves were obtained. The characteristics of detonation waves in poly- and monodisperse media were compared. The behavior of gas bubbles with various diameters in the detonation wave have been investigated. Lavrent’ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from Fizika Goreniya i Vzryva, Vol. 33, No. 3, pp. 114–119, May–June, 1997.     

Modeling of propagation of shock and detonation waves in dusty media with allowance for particle collisions

Shock-wave and detonation flows in a two-phase medium consisting of a gas and incompressible particles are studied by methods of numerical simulation with allowance for the random motion and collisions of particles. Steady solutions corresponding to two previously predicted wave types are obtained for the problem of interaction of a plane shock wave with a cloud of particles. The influence of the mixture parameters on the corresponding solutions is determined. In considering the problem of propagation of cellular heterogeneous detonation in a mixture of reacting particles, oxidizer, and inert particles, it is found that the detonation flow structure and the cell size are retained in the mixture with particle collisions. However, smearing (dispersion) of the layers and inert phase structures formed in the far zone of cellular detonation occurs because of particle collisions.     

Initiation of an explosion of a single bubble and bubble detonation

Interaction of a single chemically active bubble in water with acoustic waves is numerically studied within the framework of the model of a two-dimensional unsteady flow of an ideal compressible medium. The boundaries between the phases are explicitly identified. It is demonstrated that bubble explosion initiation can be determined by the character of bubble deformation. Nonsphericity of deformation and jet formation lead to an explosion even if the bubble does not collapse. The possibility of the bubble explosion in an expansion wave, transfer of detonation from one bubble to another, and, thus, emergence of bubble detonation is demonstrated.