scholarly journals Study of laser-driven shock wave propagation in Plexiglas targets

1992 ◽  
Vol 10 (1) ◽  
pp. 201-211 ◽  
Author(s):  
L. J. Dhareshwar ◽  
P. A. Naik ◽  
T. C. Kaushik ◽  
H. C. Pant
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
High Speed ◽  
Second Harmonic ◽  
Optical Probe ◽  
Shock Wave Propagation ◽  
Hydrodynamic Simulation ◽  
One Dimensional ◽  
Laser Beam Irradiation ◽  
Shock Fronts

An experimental study of laser-driven shock wave propagation in a transparent material such as Plexiglas using a high-speed optical shadowgraphy technique is presented in this paper. A Nd:glass laser was used to produce laser intensity in the range 1012-1014 W/cm2 on the target. Optical shadowgrams of the propagating shock front were recorded with a second-harmonic (0.53-μm) optical probe beam. Shock pressures were measured at various laser intensities, and the scaling was found to agree with the theoretically predicted value. Shock pressure values have also been obtained from a one-dimensional Lagrangian hydrodynamic simulation, and they match well with experimental results. Shadowgrams of shock fronts produced by nonuniform spatial laser beam irradiation profiles have shown complete smoothing when targets with a thin coating of a material of high atomic number such as gold were used. Shock pressures in such coated targets are also found to be considerably higher compared with those in uncoated targets.

scholarly journals Universal shock-wave propagation in one-dimensional Bose fluids

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Romain Dubessy ◽  
Juan Polo ◽  
Hélène Perrin ◽  
Anna Minguzzi ◽  
Maxim Olshanii
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Shock Wave Propagation ◽  
One Dimensional

Experimental Contribution to the Modeling of Shock Propagation Induced by a Linear Pyrotechnical Source

2008 ◽  
Vol 51 (1) ◽  
pp. 122-145 ◽  
Author(s):  
Christelle Collet ◽  
Philippe Chabin ◽  
Henri Grzeskowiak
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
High Speed ◽  
Composite Plates ◽  
Shock Wave Propagation ◽  
Shock Propagation ◽  
Mechanical Responses ◽  
Space Agency ◽  
Out Of Plane ◽  
Space Launcher

In recent years, the phenomena occurring during shock wave propagation in spatial structures have been studied to characterize more accurately and to minimize the effects of pyrotechnical sources. As part of a program managed by the Centre National d'Etudes Spatiales (CNES, the French space agency), SNPE Matériaux Energétiques (SME) and MBDA France collaborated in a study to understand the mechanisms of shock wave propagation induced by the detonation of a linear pyrotechnical source. The focus of the study was on structures representative of space launcher structures such as those used for the Ariane 5 launcher. Various experiments were performed with metallic and composite plates, and two types of measurement devices (strain gauges and accelerometers) were investigated. Additional out-of-plane velocity and displacement measurements were provided by laser vibrometers, and displays of the separation of the plates were provided by a high-speed camera (up to 4800 feet/second). Signals treatment provided bending and compression strain describing plate mechanical responses. The apparatus used and the associated concerns that arose during the firings also are discussed.

scholarly journals One-Dimensional Numerical Simulation of Shock Wave Propagation Induced by Vacuum Accidents in a Beamline.

1997 ◽  
Vol 63 (609) ◽  
pp. 1642-1648
Author(s):  
Toshio TAKIYA ◽  
Fumio HIGASHINO ◽  
Shinichi MIYAJIMA ◽  
Yukihiro TERADA ◽  
Akio KOMURA ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Wave Propagation ◽  
Shock Wave Propagation ◽  
One Dimensional

Numerical Study on Shock Wave Propagation with Obstacles during Methane Explosion

2010 ◽  
Vol 33 ◽  
pp. 114-118 ◽  
Author(s):  
Zhi Ming Qu
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Velocity Gradient ◽  
High Speed ◽  
Numerical Study ◽  
Shock Wave Propagation ◽  
Gradient Field ◽  
Shock Propagation ◽  
Mixture Flow ◽  
Methane Mixture

During shock wave propagation in the pipeline, the flow field of speed, pressure and temperature is evenly distributed. If there are obstacles, then the flow will be changed while the velocity gradient is formed near the obstacles. Passing through the obstacles, a high-speed gradient of the unburned methane mixture flow is established. While reaching the obstacle, the shock wave surface is rapidly stretched to increase the significant transmission speed. Propagating in the gradient field, the shock wave will be stretched and folded. The deformation of shock wave causes consumption of fuel and oxygen in greater unburned methane surface, which results in heat release rate increasing and faster shock propagation. In conclusion, shock wave causes larger advection speed in front of the unburned methane mixture, increasing flow velocity gradient further and leading to more intense shock wave propagation.

Analysis of rippled shock-wave propagation and ablation-front stability by theory and hydrodynamic simulation

1999 ◽  
Vol 61 (1) ◽  
pp. 43-50 ◽  
Author(s):  
N. MATSUI ◽  
K. MIMA ◽  
M. HONDA ◽  
A. NISHIGUCHI
Keyword(s):  
Shock Wave ◽  
Surface Roughness ◽  
Wave Propagation ◽  
Target Surface ◽  
Shock Wave Propagation ◽  
Hydrodynamic Simulation ◽  
Fluid Equation ◽  
Temporal Behaviour ◽  
Deceleration Phase ◽  
Acceleration And Deceleration

The hydrodynamic start-up problem is one of the most crucial issues in laser-driven symmetrical implosion. The target-surface roughness and initial imprint by nonuniform laser irradiation result in Rayleigh–Taylor instability in the acceleration and deceleration phase. To estimate the tolerance of the target-surface roughness, the temporal behaviour of corrugated ablation surface and rippled shock-wave propagation are investigated using a perturbation analysis of the fluid equation, which is solved under the boundary model of a fire-polished ablation surface. The results show good agreement with two- dimensional hydrodynamic simulation and experimental results [T. Endo et al., Phys. Rev. Lett.74, 3608 (1995)].

scholarly journals Experimental Study on Shock Wave Propagation of the Explosion in a Pipe with Holes by High-Speed Schlieren Method

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Gang Zhang
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
High Speed ◽  
Experimental System ◽  
Test System ◽  
Shock Wave Propagation ◽  
Oblique Shock Wave ◽  
Schlieren Method ◽  
Wave Fronts ◽  
Blast Energy

The shock wave propagation of the explosion in a pipe with holes was studied by a high-speed schlieren experimental system. In the experiments, schlieren images in the explosion were recorded by a high-speed camera from parallel and perpendicular orientations, respectively, and the pressure in the air was measured by an overpressure test system. In parallel orientation, it is observed that the steel pipe blocks the propagation of blast gases, but it allows the propagation of shock waves with a symmetrical shape. In perpendicular orientation, oblique shock wave fronts were observed, indicating the propagation of explosion detonation along the charge. Shock wave velocity in the hole direction is larger than that in the nonhole direction, indicating the function of holes in controlling blast energy, that is, leading blast energy to hole direction. Furthermore, the function of holes is verified by overpressure measurements in which peak overpressure in the hole direction is 0.87 KPa, 2.8 times larger than that in the nonhole direction. Finally, the variation of pressure around the explosion in a pipe with holes was analyzed by numerical simulation, qualitatively agreeing with high-speed schlieren experiments.

High Speed Photography For Studying The Shock Wave Propagation At High Mach Numbers Through A Reflection Nozzle

1979 ◽  
Author(s):  
S. G. Zaytsev ◽  
E. V. Lazareva ◽  
A. V. Mikhailova ◽  
V. L. Nikolaev-Kozlov ◽  
E. I. Chebotareva
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
High Speed ◽  
Shock Wave Propagation ◽  
High Speed Photography ◽  
Mach Numbers ◽  
High Mach

scholarly journals Dynamics in a one-dimensional ferrogel model: relaxation, pairing, shock-wave propagation

2018 ◽  
Vol 20 (22) ◽  
pp. 15037-15051 ◽  
Author(s):  
Segun Goh ◽  
Andreas M. Menzel ◽  
Hartmut Löwen
Keyword(s):  
Shock Wave ◽  
Wave Propagation ◽  
Shock Wave Propagation ◽  
Relaxation Dynamics ◽  
One Dimensional

Based on theory and simulations, we elucidate the relaxation dynamics of a one-dimensional ferrogel model and provide classification scenarios.

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