Self-sustaining detonation in liquids with bubbles of explosive gas

Bubble detonation as a self-sustained solitary wave with energy release

“…In [1][2][3][4][5][6], it is noted that the bubble detonation parameters are determined by the initial properties of the gas-liquid medium (volume concentration of bubbles β 0 and liquid viscosity μ 1 ) and that a bubble detonation wave and a solitary wave in an inert liquid [4] have close properties and structures. Energy release in the bubbles leads to a 10-30% increase in the bubble detonation velocity compared to a solitary wave in an inert medium [3,4,6].…”

“…In [15], the compressibility of the liquid, the induction period of the chemical reaction, and the shift of chemical equilibrium in gas bubbles by the kinetic model were taken into 1 Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090; avpin@ngs.ru. 2 Novosibirsk State University, Novosibirsk 630090; kii@gorodok.net account [24]. In numerical calculations, the bubble detonation velocity was determined from the establishment of steady-state detonation.…”

“…Self-sustained waves of bubble detonation were first found experimentally and studied [1][2][3][4][5][6] in two types of systems with a low energy release: an inert liquidexplosive gas bubbles [1,2]; a combustible liquidoxygen bubbles [3]. Those studies showed that a bubble detonation wave propagated bubble detonations in a tube 5 m long with an average uniform distribution of bubbles, and its steady-state velocity did not depend on the method and intensity of initiation.…”

Bubble detonation conditions

“…The basis for this assumption was the close agreement between the values of p ∞ and the average pressure in the shock wave propagating over the initial segment of the bubble medium [2]. Based on this, the critical (minimum) values of the shock-front pressure p * 1 in gases at which bubble detonation occurs were given in [1,3] for some systems "inert liquid-explosive gas bubbles.…”

“…In [1], direct measurements of the shock-wave pressure above the upper boundary of the bubble medium were not performed and the shock-front pressure was evaluated from the pressure in the initiation section. The pressure was estimated under the assumption that the initiating SW amplitude is close to the combustion pressure of the explosive gas mixture in a closed volume p ∞ and proportional to the initial pressure p 0i in the IS (for example, p ∞ = 17.07p 0i for a C 2 H 2 + 2.5O 2 mixture).…”