Deflagration-to-detonation transition in mixtures of finely divided ammonium perchlorate with submicron aluminum powder View Full Text


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Article Info

DATE

2015-11

AUTHORS

V. G. Khudaverdiev, A. A. Sulimov, B. S. Ermolaev, V. E. Khrapovskii

ABSTRACT

Deflagration-to-detonation transition in binary mixtures of fine ammonium perchlorate (20-μm grains) with submicron ALEX-L aluminum powder (0.2-μm particles) is studied using high-speed photography and pressure recording with quartz crystal sensors. The test mixtures were loaded in thin-walled quartz tubes of inner diameter 10 mm. The charges had a porosity of ~50%. It has been shown that, even under very mild conditions (low-strength shell and a weak source of initiation), the deflagration mode of mixture combustion easily transforms into the detonation mode. The shortest length of the region of transition from deflagration to normal detonation (not more than 30 mm) was observed for a lean mixture, with an aluminum content of ~5%. The mechanism of transition to detonation involves the stage of convective combustion, resulting in the formation of a brightly luminescent crescent-shaped area behind the primary flame front, which, in turn, generates a forward (in the direction of propagation) and a backward wave. The forward wave gives rise to low-speed detonation, which later transforms into normal detonation. The pressure profile within the region of low speed detonation is measured. A comparison with similar experiments in which ALEX-L alu- minum powder was replaced by ASD-4 aluminum (4 μm particles) shows that ALEX-L sensitizes the mixture, resulting in a dramatic reduction of the length of the transition region, making it possible to produce normal detonation in low-strength shells. More... »

PAGES

901-906

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1990793115060056

DOI

http://dx.doi.org/10.1134/s1990793115060056

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032908096


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