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Semi-confined blast loading: experiments and simulations of internal detonations
Springer Science and Business Media LLC -
Martin Kristoffersen, Folco Casadei, Valsamos Georgios, Martin Larcher, K. O. Hauge, Arianna Minoretti, Tore Børvik
AbstractFar-field blast loading has been studied extensively for decades. Close-in, confined, and semi-confined detonations less so, partly because it is difficult to obtain good experimental data. The increase in computational power in recent years has made it possible to conduct studies of this kind numerically, but the results of such simulations ultimately depe...... hiện toàn bộ
Numerical simulations of shock-induced load transfer processes in granular media using the discrete element method
Springer Science and Business Media LLC - Tập 22 - Trang 57-68 - 2011
Y. Sakamura, H. Komaki
By the discrete element method (DEM), we perform numerical simulations of shock-induced load transfer processes in granular layers composed of spherical particles packed in vertical channels. In order to isolate the load transfer through the grains’ contact points from the complicated load transfer processes, we simulate the shock wave interactions with granular layers having no permeability for g...... hiện toàn bộ
Simulation of the Mach reflection in supersonic flows by the CE/SE method
Springer Science and Business Media LLC - Tập 14 - Trang 307-311 - 2005
T. I. Tseng, R. J. Yang
This study employs the Space-Time Conservation Element and Solution Element (CE/SE) method to determine the influence of downstream flow conditions on Mach stem height. The results indicate that the Mach stem height depends on the incident shock wave angle and the distance between the trailing edge and the symmetry plane. Furthermore, it is shown that the downstream length ratio and the trailing e...... hiện toàn bộ
Investigations of gas and particle dynamics in first generation needle-free drug delivery devices
Springer Science and Business Media LLC - Tập 10 - Trang 395-404 - 2001
N.J. Quinlan, M.A.F. Kendall, B.J. Bellhouse, R.W. Ainsworth
Abstract. Transdermal powdered drug delivery involves the propulsion of solid drug particles into the skin by means of high-speed gas-particle flow. The fluid dynamics of this technology have been investigated in devices consisting of a convergent-divergent nozzle located downstream of a bursting membrane, which serves both to initiate gas flow (functioning as the diaphr...... hiện toàn bộ
Propagation of blast waves with exponential heat release and internal heat conduction and thermal radiation
Springer Science and Business Media LLC - Tập 3 - Trang 95-104 - 1993
W. Gretler, P. Wehle
The problem of reactive blast waves in a combustible gas mixture, where the heat release at the detonation front decays exponentially with the distance from the center, is analyzed. The central theme of the paper is on the propagation of reactive blast into a uniform, quiescent, counterpressure atmosphere of a perfect gas with constant specific heats. The limiting cases of Chapman-Jouguet detonati...... hiện toàn bộ
11th international Mach reflection symposium
Springer Science and Business Media LLC - Tập 4 - Trang 113-115 - 1994
J. M. Dewey
An analytical model for shock wave impact on compressible open-cell foam
Springer Science and Business Media LLC - Tập 16 - Trang 287-298 - 2007
M. W. Seitz, B. W. Skews
A simple model is proposed to describe the main features of the complex phenomena that occur when a plane shock wave strikes a open-cell foam block. The complex two-phase interactions can be simplified using the experimental evidence that the foam face may be treated as a contact surface, that the length of the collapsed foam plug grows linearly in time, and that the gas pressure profile in the re...... hiện toàn bộ
The flow field near the triple point in steady shock reflection
Springer Science and Business Media LLC - Tập 21 - Trang 267-272 - 2011
A. Sakurai, M. Tsukamoto, D. Khotyanovsky, M. Ivanov
This paper investigates the flow field near three intersecting shock waves appearing in steady Mach reflection. Results of numerical computations reveal a “von Neumann Paradox”—like feature for weak shock waves, in which the flow field between the reflected and the Mach stem is smooth with no distinct slip flow region and changes rather smoothly. An analytical solution of the Navier–Stokes equatio...... hiện toàn bộ
Computational and experimental study of supersonic flow over axisymmetric cavities
Springer Science and Business Media LLC - Tập 21 Số 3 - Trang 175-191 - 2011
Khadijeh Mohri, R. Hillier
Scale effect of spherical projectiles for stabilization of oblique detonation waves
Springer Science and Business Media LLC - Tập 25 - Trang 141-150 - 2015
S. Maeda, S. Sumiya, J. Kasahara, A. Matsuo
Oblique detonation waves (ODWs) were stabilized by launching a spherical projectile with 1.2–1.4 times the Chapman–Jouguet (C–J) velocity into detonable mixtures at rest. We used smaller projectiles (3.18 mm diameter) than those (4.76 mm diameter) in our previous studies and investigated the effect of the projectile scale on the stabilization of ODWs. We carried out high time resolution schlieren ...... hiện toàn bộ
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