A rectangular-bore gas gun

Hutchings, IM; Rochester, Michael Colin; Camus, J.-J.

doi:10.1088/0022-3735/10/5/012

Cited by 19 publications

(8 citation statements)

References 3 publications

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“…The shock amplitude was 0.3 GPa produced by the impact of a rectangular, phosphor-bronze flyer plate fired between the transparent blocks so that it impacted the front surface of the gelatine. The slider had a circular section removed to reduce its mass and was fired from a rectangular-bore gas gun (Hutchings, Rochester & Camus 1977). The slider was accelerated to a velocity of about 150 m s-l and had a mass of 5.5 g.…”

Section: Methodsmentioning

confidence: 99%

Cavity collapse in a liquid with solid particles

Bourne

Field

1994

J. Fluid Mech.

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An experimental study of the interaction of weak shock waves in a liquid with bubbles and solid particles has been conducted. Cavities were punched, and solid particles were cast, into a thin sheet of gelatine clamped between two transparent blocks. A shock of pressure 0.3 GPa was introduced by impacting the gelatine layer with a flyer plate. The subsequent collapse of the cavities was photographed using high-speed framing cameras, and waves in the gelatine were visualized using schlieren optics. Assorted cavity/particle geometries were studied. In the first, cavity and particle were aligned on an axis parallel to the incident shock front. The jet crossing the cavity was found to deviate from the perpendicular to the shock front. This deviation was towards the solid particle when separations were small and away from the particle when separations were increased. When a cavity was placed upstream of a solid particle the collapse time was reduced. Conversely, when a cavity was placed downstream of a solid particle, collapse time was increased and the closure was more symmetrical. These observations were explained in terms of wave reflections. Collapses where the cavity/particle axis was inclined to the incident shock showed features of each of the geometries described above.

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Section: Methodsmentioning

confidence: 99%

Cavity collapse in a liquid with solid particles

Bourne

Field

1994

J. Fluid Mech.

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“…The slider had a circular section removed to reduce weight. The velocity of the slider was 150 m s-1 and it had a weight of 5.5 g. The slider was fired from a rectangular-bore gas gun of a type described by Hutchings et al (1977).…”

Section: Methodsmentioning

confidence: 99%

Bubble collapse and the initiation of explosion

Bourne

Field

1991

Proc. R. Soc. Lond. A

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Experiments were conducted to investigate the initiation of an emulsion explosive containing cavities. Cylindrical cavities were created in thin sheets of either gelatine or an ammonium nitrate/sodium nitrate emulsion confined between transparent blocks. Shocks were launched into the sheets with either a flier-plate or an explosive plane-wave generator so as to collapse the cavities asymmetrically. The closure of the cavities and subsequent reaction in the explosive was photographed by using high- speed framing cameras. The collapse of the cavity proceeded in several stages. First, a high-speed jet was formed which crossed the cavity and hit the downstream wall sending out a shock wave into the surrounding material. Secondly, gas within the cavity was heated by rapid compression achieving temperatures sufficient to lead to gas luminescence. Finally, the jet penetrated the downstream wall to form a pair of vortices which travelled downstream with the flow. When such a cavity collapsed in an explosive, a reaction was observed to start in the vapour contained within the cavity and in the material around the heated gas. The ignition of material at the point at which the jet hit was found to be the principal ignition mechanism.

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“…In order to perform this research, Winter and Hutchings developed laboratory light gas guns for accelerating both spherical (or cylindrical) [32] and angular [33] projectiles. The aim at this stage was to study the fundamental mechanisms of solid particle erosion by taking high-speed photographic sequences of the impact of single macroscopic particles.…”

Section: Metalsmentioning

confidence: 99%