Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"blast wave"”.
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Blast wave attenuation using liquid sheets
Strong blast waves, such as those associated with gun fire or rocket exhausts, can cause serious physiological and/or structural damage. It is necessary, therefore, to develop ways in which to minimise this damage whilst still allowing the system that produces the blast waves to function normally. …
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An investigation of blast wave transmission through rodent simulants
… caused by exposure to explosively generated blast waves. The protection of soldiers is paramount, so research into the effect of blast waves on the brain and body has been ongoing so that more effective protective equipment can be created. Historically, this research has been done by …
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Theoretical investigation of the second shock in the blast wave
In the study of blast waves from a finite sphere, it has been observed that in addition to the primary strong shock wave ahead of the driving gas, a second shock also forms inside of this driving gas. This formation of the second shock will invalidate all the existing theories of blast waves in …
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Performance of mild steel perforated plates as a blast wave mitigation technique
… on the performance of perforated plates as a blast wave mitigation technique. Results of experimental and numerical simulations are reported. The main objective of this investigation was to determine the effects of the perforated plate hole size on the blast wave mitigation capability of the …
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Effect of endplate on the blast wave profile in a compressed gas shock tube
Blast related brain injuries are commonly encountered in the recent wars of Iraq and Afghanistan increased use of improvised explosive devices (IEDs). An estimated 20% of veterans returning from these operations have suffered traumatic brain injuries (TBI). The mechanisms and long-term effects of …
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The Blast Wave Produced by Bursting Spheres With Simultaneous or Delayed Explosion or Implosion of The Contents
… a systematic study to determine the structure of blast waves generated by a variety of non-ideal energy sources. The energy sources considered included bursting spheres, centrally initiated spherical explosions, edge initiated spherical implosions and combinations of the above with and without …
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Ultrastructural damages in the brain induced by low-intensity primary blast wave : a transmission electron microscopy study on mild traumatic brain injury
… AT AUTHOR'S REQUEST.] Explosive blast-induced mild traumatic brain injury (mTBI), a "signature wound" of recent military conflicts, commonly affects Service Members. While past blast injury studies have provided insights into TBI with moderate-to high-intensity explosions, the …
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Numerical study on scaling effects and decoupled network-based simulation of gaseous explosion
… space is divided into a driver section and a blast-wave section. Governing equations including conservation of mass, momentum, and energy, together with chemical reaction and turbulence models are solved for the driver and the blast-wave sections using computational fluid dynamics (CFD) solver …
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Numerical study of detonation in solid explosives under hydrodynamic and elastic-plastic confinement
… capture their interaction with the detonation wave. We initially consider detonation propagation in annular charges. The model and implementation are validated against experimental data for steady state propagation. Then, the numerical solution is used to obtain a detailed description of the …
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The Blast Waves From Unconfined Axisymmetric Vapour-Cloud Explosions
… dissertation presents a systematic study of the blast waves produced by axisymmetric detonation waves and constant velocity as well as accelerating deflagration waves propagating through homogeneous axisymmetric clouds whose energy density approximate that of a typical hydrocarbon-air mixture. …
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Active control of supersonic boundary layers using electric arc plasma actuators
… behavior is believed to be due to complex wave dynamics and reflections within the cavity. The maximum transverse velocity achieved by the jet was about 9.8% of the freestream velocity, and the maximum penetration of the jet into the crossflow was about 1.33δ. There was also some evidence …
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On the formation of Friedlander waves in a compressed gas driven shock tube
… as a laboratory-scale replacement for field blast tests. The well-known initial structure of the Riemann problem eventually evolves into a shock structure resembling a Friedlander wave. In this thesis, we develop an analytical model to predict its key characteristics: location where the wave …
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The effect of blast loading on a guy cable
The blast loading on a structure is a function of the incident blast wave characteristics, that is, overpressure and dynamic pressure. But the most damaging effect to the guy cable from a nuclear explosion would be the dynamic pressure caused by the high winds which follow the chock front. This …
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Using optical techniques to measure aluminum burning in post-detonation explosive fireballs
… is activated and combusted in the initial blast wave and the subsequent fireball containing high pressure and high temperature detonation products. Tests in four environments–air, pure O2, pure CO2, and pure N2–show that even when AlO emission intensity is lower by 90 percent in N2 or CO2 …
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Applications of Lie Group Methods to the Equations of Magnetohydrodynamics
… are solved numerically: The problem of a blast wave in an inhomogeneous atmosphere, the problem of a piston moving according to a power law in time, and the problem of a piston moving according to an exponential law in time.
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Rodent testing device surrogate for shockwave blast testing
… laboratories around the world are conduct shockwave blast injury tests on rodents to simulate blast traumatic brain injury (TBI). Each of these laboratories has different techniques for creating the shockwave blasts as well as positioning the rats. There is no device to determine whether or not …
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An innovative protective jacket for structures subject to blast loads: A comprehensive experimental and simulation study
… aids in the preservation of life safety during blast events is an important topic of research in structural engineering. This protection is especially vital for blast and explosion mitigation, where a vehicle-borne bomb or an improvised explosive device can readily cause an under-designed …
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Digital analysis of narrow band imagery of the Cygnus loop
… a continuous transition with distance behind the blast wave from non-steady-flow shocks with velocities >= 13 km/sec to steady-flow shocks with velocities ≈ 6 km/sec .
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Mechanics of blast-induced traumatic brain injury in porcine brain tissue
<p>Blast-induced traumatic brain injury (bTBI) often results from the detonation of improvised explosive devices (IEDs) in war settings. However, the material properties of the brain and their changes during and after bTBI are currently not well understood. Characterizing brain tissue is …
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Blast Propagation and Damage in Urban Topographies
… for an improved approach to the prediction of blast propagation in urban cityscapes. Urban geometry has a significant impact on blast wave propagation. Presently, only computational fluid dynamics (CFD) methods adequately simulate these effects. However, for large-scale urban domains, these …
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