ON THE DETONABILITY AND BLAST FROM PROPYLENE-OXIDE AND NITROMETHANE DROPLET-AIR CLOUDS

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Authors
  1. Murray, S.B.
  2. Gerrard, K.B.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
This paper describes the results of experiments to assess the potential of fuel-air explosive (FAE) line charges in minefield breaching operations. The line charge consists of a 65-mm diameter hose filled with a liquid hydrocarbon and fitted with an internal detonating cord referred to as the "burster" charge. When the detonating cord is initiated, the hose fragments and the fuel is propelled outward to form a large droplet-air cloud. The cloud is detonated a short time later by a high-explosive "secondary" charge. The detonability of propylene oxide fuel is first determined in a series of tests employing FAE cansiters of nominal 3-litre volume. The critical mass of secondary charge for direct initiation of spherical detonation in a globally stoichiometric droplet-air cloud is found to be 10 grams of DM12 (85% PETN) explosive, indicating that propylene-oxide-air and ethylene-air have similar detonation sensitivities. The results of line-charge trials show that the optimum ratio of fuel mass to burster charge mass (the F/B ratio) is about 50 and that an initiation time delay (delta t) of 150 ms is most satisfactory. The blast efficiency of the line charges in this study is about 40% based on a comparison between the measured and theoretically predicted positive impulses. TRUNCATED
Keywords
Line charge;Nitromethane;Droplet cloud;Initiation of Detonation;Impulse;Detonability;Detonation wave;Minefield breaching
Report Number
DRES-M-1499 — Memorandum
Date of publication
01 Oct 1997
Number of Pages
30
DSTKIM No
98-01923
CANDIS No
508783
Format(s):
Hardcopy;Document Image stored on Optical Disk

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