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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
Detonation structure of C $_2$ H $_4$ -O $_2$ -Ar mixtures at elevated initial temperature
Springer Science and Business Media LLC - Tập 9 - Trang 107-111 - 1999
Y. Auffret, D. Desbordes, H.N. Presles
The influence of initial pressure and temperature on the detonation structure of stoichiometric ethylene-oxygen-argon mixtures was studied. The detonation tube (53 mm i.d. and 7.2 m long) was electrically heated by Joule effect at a rate of about 100 K per minute. For initial pressures ranging from 0.1 to 1 bar, experimental results show that the detonation cell size increases with the initial te...... hiện toàn bộ
Experimental investigation of shock wave diffraction over a single- or double-sphere model
Springer Science and Business Media LLC - Tập 27 - Trang 97-107 - 2016
L. T. Zhang, T. H. Wang, L. N. Hao, B. Q. Huang, W. J. Chen, H. H. Shi
In this study, the unsteady drag produced by the interaction of a shock wave with a single- and a double-sphere model is measured using imbedded accelerometers. The shock wave is generated in a horizontal circular shock tube with an inner diameter of 200 mm. The effect of the shock Mach number and the dimensionless distance between spheres is investigated. The time-history of the drag coefficient ...... hiện toàn bộ
Thermochemical study of the detonation properties of boron- and aluminum-containing compounds in air and water
Springer Science and Business Media LLC - Tập 33 - Trang 501-520 - 2023
K. A. Byrdin, S. M. Frolov, P. A. Storozhenko, S. L. Guseinov
Contrary to the conventional chemical propulsion systems based on the controlled relatively slow (subsonic) combustion of fuel in a combustor, the operation process in pulsed detonation engines (PDEs) and rotating detonation engines (RDEs) is based on the controlled fast (supersonic) combustion of fuel in pulsed and continuous detonation waves, respectively. One of the most important issues for su...... hiện toàn bộ
Editorial
Springer Science and Business Media LLC - Tập 14 - Trang 1-1 - 2005
Kazuyoshi Takayama
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
Suppression of embedded shocks in supersonic free-shear-layer structures
Springer Science and Business Media LLC - Tập 6 - Trang 167-175 - 1996
A. Umemura, K. Miura, K. Takada
Although the suppressed instability of supersonic free shear layer flow has been documented by many investigators, the underlying physics are still ambiguous. In the present study, numerical simulations were performed to cast physical insight into the two-dimensional large-scale structure which is organized in a supersonic free shear layer. It is found that an acoustic interaction of the disturbed...... hiện toàn bộ
Holographic interferometric investigation of shock wave interaction with a ramp
Springer Science and Business Media LLC - Tập 2 - Trang 133-138 - 1992
S. M. Tieng, K. T. Chang, F. M. Yu
The internal flowfield including shock reflections structure inside a 2-D half inlet model was examined by a double exposure holographic interferometry using a Q-switched pulse laser. The interferograms give detailed flow visualization pictures. The structures of regular reflection, lambda reflection and Mach reflection in the inlet channel were observed. From the analysis of fringe patterns, the ...... hiện toàn bộ
Aerodynamic characteristics of a two-dimensional supersonic biplane, covering its take-off to cruise conditions
Springer Science and Business Media LLC - Tập 18 - Trang 437-450 - 2008
Daigo Maruyama, Kazuhiro Kusunose, Kisa Matsushima
Supersonic biplanes can possibly achieve low-boom and low-drag supersonic flights. In the present study, aerodynamic analysis and design of two-dimensional (2-D) biplanes were investigated with the help of computational fluid dynamics (CFD) tools. By utilizing an inverse-design method, a 2-D biplane configuration with lower wave drag than the single flat-plate airfoil at sufficient lift conditions...... hiện toàn bộ
Aluminum Particles–air Detonation at Elevated Pressures
Springer Science and Business Media LLC - Tập 15 - Trang 313-324 - 2006
F. Zhang, S. B. Murray, K. B. Gerrard
The effect of initial pressure on aluminum particles–air detonation was experimentally investigated in a 13 m long, 80 mm diameter tube for 100 nm and 2 µm spherical particles. While the 100 nm Al–air detonation propagates at 1 atm initial pressure in the tube, transition to the 2 µm aluminum–air detonation occurs only when the initial pressure is increased to 2.5 atm. The detonation wave manifest...... hiện toàn bộ
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