Bubble detonation conditions

Abstract

Initiation of bubble detonation in the system "inert liquid-explosive gas bubbles" by a detonation wave in a gas was studied experimentally. Compression-wave pressure profiles were determined as functions of the length of the initiation section and the initial pressure of the explosive gas mixture in it. It was shown that because of the effect of the explosive-gas volume between the diaphragm and the upper boundary of the bubble medium, the pressure in front of the initiating wave increased much more slowly than the initial pressure. The optimal length of the initiation section was found, and the critical (minimum) initiation pressure in it and at the shock-wave front were determined. It was found that for a fixed gas volume concentration in the bubble medium, the pressure in the initiation section increased insignificantly as the length of the section decreased.

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

“…1. Comparison of typical pressure oscillograms [34] in a bubble detonation wave at the first (a) and second (b) pressure transducers with the analytical relations obtained: 1) experimental pressure profile; 2) pressure obtained by averaging of oscillogram 1; 3) pressure profile calculated from (19); the gas mixture is C2H2 + 2.5O2 and the liquid is 75% H2O + 25% glycerin (μ1 = 2.3 · 10 −3 Pa · sec), U = 750 m/sec, Δp0 = 7 MPa, γ = 1.33, q0 = 15.2 MJ/m 3 , k = 42, and σ1 = 1.6.…”