Convective burning of pressed aluminum-ammonium perchlorate charges View Full Text


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Article Info

DATE

2007-02

AUTHORS

V. E. Khrapovskii, B. S. Ermolaev, A. A. Sulimov, A. A. Belyaev, V. A. Foteenkov

ABSTRACT

The convective burning of pressed aluminum-ammonium perchlorate (AP) charges with a porosity of 7 to 18% was studied. The experiments were performed at pressures of up to 300 MPa in a constant volume bomb provided with means for recording pressure-time diagrams, and in a nozzle setup equipped with a streak photocamera and piezoelectric pressure gauges. In contrast to loose-packed-density charges, which are highly explosive, the burning of pressed aluminum-AP charges propagates without marked acceleration, with a moderate velocity and a relatively slow rise in pressure in the bomb. The basic regularities were studied, and the key factors that determine the characteristics of convective burning, such as the aluminum particle shape (when a finely dispersed spherical-particle powder was replaced by a flaky aluminum powder with the same speciic surface area, the convective burning velocity decreased by more than an order of magnitude), ratio of mixture components, and charge porosity, were identified. The effects of the ammonium perchlorate particle size, an organic additive, and the ignitor mass were also studied. The experimental data were analyzed by invoking numerical modeling. The calculations were performed using a program developed earlier based on a model of the convective burning of aluminum-AP mixtures. The calculation results, which were in qualitative agreement with the available experimental data, made it possible to explain the main experimentally observed regularities. The compositions tested and the results obtained are of considerable interest for designing convective-burning charges for multipurpose pulse engines and thermo-and gas generators with operation durations from a few milliseconds to several tens of milliseconds. More... »

PAGES

27-38

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1990793107010046

DOI

http://dx.doi.org/10.1134/s1990793107010046

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032369532


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