Visualization and analysis of muzzle flow fields using the Background-Oriented Schlieren technique

Moumen, Abdelhafidh; Grossen, Jurgen; Ndindabahizi, I.; Gallant, Johan; Hendrick, Patrick

doi:10.1007/s12650-020-00639-w

Cited by 17 publications

(18 citation statements)

References 27 publications

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“…A frame rate of 20,000 fps (frame per second) and a shutter speed of 6.42 µs are chosen together with a picture resolution of 704 × 520 pixels in order to measure the projectile velocity at the exit of the tube. A black and white speckle pattern, printed on a transparency film, is attached to the plexiglas [26]. Additionally, the speckle pattern is back-illuminated using two 575 W halogen lamps.…”

Section: Description Of the Experimental Setupmentioning

confidence: 99%

An Explosive Driven Shock Tube-Based Laboratory Scale Test for Combined Blast and Fragment Impact Loading

et al. 2022

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This work is a part of a larger research effort to better understand the combined effect of the blast wave and fragment impacts following the detonation of a shrapnel bomb. It is known that the time interval Δt, which represents the difference in arrival time between the blast wave front and the fragment at the position of a given target object, has a significant influence on its response mode. This paper presents insights into the establishment of a laboratory scale technique to generate a combined blast loading and single or multiple projectile impacts on a target. The objective of the setup is to control the time interval Δt to a certain extent so that the different response modes of the tested structures can be investigated. In order to reduce the complexity associated with the random nature of the shrapnel, steel ball bearings are used to simulate the projected fragments. They are embedded in a solid explosive charge, which is detonated at the entrance of an explosive driven shock tube. The experimental work demonstrates that it is possible to orient the path of a single projectile inside the tube when aiming at a target positioned at its exit. The setup guarantees the generation of a well-controlled planar blast wave characterized by its peak pressure, impulse and blast wave arrival time at the exit of the tube. The influence of the mass of the charge and the diameter of the projectile on its velocity study shows that for the same charge mass, the time interval increases with increasing projectile diameter. The experiments are numerically simulated based on an Eulerian approach using the LS-DYNA finite element software. The computational model allows to reveal details about the projectile flight characteristics inside the tube. Both the experimental and numerical data show the influence of the charge and projectile parameters on the time interval.

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Section: Description Of the Experimental Setupmentioning

confidence: 99%

An Explosive Driven Shock Tube-Based Laboratory Scale Test for Combined Blast and Fragment Impact Loading

et al. 2022

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“…is a considerable progress in the capacity for quantitative flow visualization. BOS is increasingly employed in a broad range of areas ranging from ballistics (Moumen et al (2020)) to aeronautics research (Raffel (2015)) thanks to its simplicity and low cost. Moreover, its large field of view has enabled to expand from laboratory to real-scale experiments (Hargather and Settles (2010)).…”

Section: List Of Symbolsmentioning

confidence: 99%

Monte Carlo-based a posteriori uncertainty quantification for background-oriented schlieren measurements

Moumen

Briey

Atoui

et al. 2022

J Vis

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“…Based on several visualization experiments on the muzzle flow field of the gun fired in air [1][2][3][4], the gas expansion and shock wave structure of the muzzle flow field have been clearly understood. Nevertheless, it is difficult to observe the fine structure of the muzzle flow field through experiments due to the complexity of the muzzle flow field and the extremely high time-space evolution characteristics.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Muzzle Flow Field Characteristic of Machine Gun in Different Environments

Zhang

2023

J. Phys.: Conf. Ser.

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To study the distribution characteristics of the muzzle flow field of the underwater sealed launch in different environments, a two-dimensional axisymmetric multiphase flow numerical model was established. The VOF multiphase flow model, Standard k-ε turbulence model, user-defined function (UDF), and dynamic mesh technology are used to simulate the evolution process of the muzzle flow field of underwater sealed launch and air launch. The calculation results show that the muzzle flow field of the underwater sealed launch is significantly different from that in air. The initial velocity of the projectile for underwater sealed launch is 64 m/s, lower than that in air, while the muzzle pressure and temperature are significantly increased. The Mach disk is initially formed at about 145μs for launched underwater, while it is about 240μs for air launch. When launching underwater, the velocity of the projectile is linear attenuation after it leaves the muzzle, while the projectile first accelerates and then slowly decays launched in air. Compared with launching in air, the core area of the shock wave launched underwater is smaller, the pressure at the warhead is relatively higher, and there is no crown shock wave in front of the projectile head.

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Visualization and analysis of muzzle flow fields using the Background-Oriented Schlieren technique

Cited by 17 publications

References 27 publications

An Explosive Driven Shock Tube-Based Laboratory Scale Test for Combined Blast and Fragment Impact Loading

An Explosive Driven Shock Tube-Based Laboratory Scale Test for Combined Blast and Fragment Impact Loading

Monte Carlo-based a posteriori uncertainty quantification for background-oriented schlieren measurements

Analysis of Muzzle Flow Field Characteristic of Machine Gun in Different Environments

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