The quasi-steady regime in critically initiated detonation waves

摘要: Experimental work is described on the initiation of spherical detonation waves, in oxyacetylene with various diluents, using an exploding wire and a lead azide pellet as sources. The transition blast wave to detonation, when source energy either above or at critical value, studied by three methods. Changes structure are inferred from cellular patterns obtained smoked foils orientated radially flow: wavefront velocity derived Doppler frequencies pilot pressure variation measured. For supercritical energies results provide detailed history process. At it shown that transverse structure, which present initially overdriven wave, disappears low-velocity regime established. duration quasi-steady approximately 10 mu s (or distance 1 cm) before establishment normal CJ wave.