Effect of explosive charge geometry on shock wave propagation

Johnson, Catherine E.; Mulligan, Phillip R.; Williams, Kelly; Langenderfer, Martin; Heniff, Jeffrey

doi:10.1063/1.5044977

Cited by 16 publications

(2 citation statements)

References 5 publications

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“…Then, the shock wave front leaves the decelerated discharge channel, as can be seen in frame #5. In addition, the shock wave gradually evolves from the initial cylindrical shape to a spherical one, due to the pressure gradient and redistribution on the shock wave front [25]. Mach stem is observed above the plate, which is caused by the reflection of shock waves.…”

Section: Lightning Strike On Aluminiun Platementioning

confidence: 99%

Observation and verification of surface electrical explosion driven by radial‐distributed pulsed current in laboratory lightning strike test

Han,

Cao,

Liu

et al. 2023

High Voltage

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The laboratory lightning test is essential for assessing the effectiveness of lightning strike protection (LSP). Particularly, direct lightning strike damage can be performed with pulsed current injection into the specimen. This paper focuses on the dynamic process of arc plasma and shock wave behaviour in the vicinity of the ‘strike’ point. A rod‐plate discharge load is built for testing aluminium and coated plate under 40‐kA‐level pulsed current. The visualisation of the luminous discharge plasma and its flow field via high‐speed photography (from different angles) is meticulously designed and implemented, synchronised with electro‐physical diagnostics. The results indicate some new mechanisms for lightning strike damage, apart from the impulse heat loading from the thermal arc. The transient current injection through the arc root concentrates on a thin skin layer (skin‐depth effect), with the radial‐attenuated current density, driving asynchronously electrical explosions on the plate surface. The inhomogeneous Joule heating of the plate leads to outwardly propagating phase transition and shock wave along the conductive surface. In addition, the electro‐thermal instability is observed and regarded as the seed of irregular erosion region. Spectroscopic information reveals two different plasma states of main discharge arc channel and adjacent surface electrical explosion. The correspondence of the physical mechanism of electrical explosion and optical radiation is established. Microscopic images for different regions depict erosion characteristics and summarise influencing factors, further confirming the mechanism above. The research clarifies the role of skin‐depth effect in transaction arc erosion for electrode, complements the electrical explosion theory with unevenly distributed current and helps optimise strategies of LSP.

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Section: Lightning Strike On Aluminiun Platementioning

confidence: 99%

Observation and verification of surface electrical explosion driven by radial‐distributed pulsed current in laboratory lightning strike test

Han,

Cao,

Liu

et al. 2023

High Voltage

View full text Add to dashboard Cite

show abstract

“…It has various configurations (e.g. blast wave [31] from a charge [32] of various geometries [33]). Smallest possible devices is 04 placed at the corners of regular tetrahedron.…”

Section: Polyhedron Configurationmentioning

confidence: 99%

Design of Non-Tactical Deployable 20 Gwh (17.20841 Kilo Ton TNT) Fusion Device - Energy Basis

Rafique¹

2022

Preprint

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Fusion device and its structure may be designed by various means. Two of most popular are; weight basis (described in previous study by author) and energy basis. In present research, later method is explored and described. Energy basis is based on amount of energy released from device upon detonation followed by explosion. Its beneficial in a sense that device size can be kept as independent variable as compared to dependent in former case. Further, it shortens the design procedure. For example, heat transfer pattern in such approach directly helps in quantifying wall thickness which dictates material, fabrication, and manufacturing route. It may also eliminate anisotropy as wall thickness is direct function of amount of heat at which it will rupture and can be much thinner. Device geometry can also be flexibility controlled as it is no longer dependent on pay load bay capacity. This allows more freedom in designing subsystems (compartments, their locations, focusing, switches, and mixers). Such devices can be more compact and simpler. Few such design configurations are proposed.

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An evaluation of measured and predicted air blast parameters from partially confined blast waves

et al. 2021

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Effect of explosive charge geometry on shock wave propagation

Cited by 16 publications

References 5 publications

Observation and verification of surface electrical explosion driven by radial‐distributed pulsed current in laboratory lightning strike test

Observation and verification of surface electrical explosion driven by radial‐distributed pulsed current in laboratory lightning strike test

Design of Non-Tactical Deployable 20 Gwh (17.20841 Kilo Ton TNT) Fusion Device - Energy Basis

An evaluation of measured and predicted air blast parameters from partially confined blast waves

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