Simulation of Blast Fields by Hydraulic Analogy,
CRANFIELD INST OF TECH (ENGLAND)
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The blast wave emanating from the rear of most shoulder-launched recoilless weapons can be literally deafening. To reduce the blast over-pressure a number of different silencers have been proposed. The cost of field trials on the actual weapon is considerable so the hydraulic analogy has been used to investigate over 70 configurations, and to try to understand the various mechanisms that reduce the overpressure at the relevant ear position. Measurements have also been made using a 32 mm air-driven, open-ended shock-tube fitted with a variety of silencers and exhausting into the atmosphere. Comparisons have been made between the two-dimensional hydraulic analogy and the three-dimensional shock tube results in order to check hydraulic analogy has also been used to simulate the effects of one or more reflecting surfaces when firing recoilless weapons in rooms, streets and passageways.