共查询到20条相似文献,搜索用时 15 毫秒
1.
A. A. Borisov A. A. Sulimov M. K. Sukoyan P. V. Komissarov I. O. Shamshin R. Kh. Ibragimov Yu. M. Mikhailov 《Russian Journal of Physical Chemistry B, Focus on Physics》2009,3(6):936-944
Experiments on the detonation of high-density (1.8 g/cm3) aluminum-ammonium perchlorate-paraffin-RDX formulations in an unconfined space demonstrated their high efficiency at pressure
amplitudes within 0.3–7.0 atm. The relative pressure amplitude and impulse of the blast waves with respect to the analogous
characteristics of TNT charges of the same mass were found to be 1.3–2.4. The TNT equivalents in pressure and impulse vary
with the distance nonmonotonically, ranging within 1.4–2.8. The blast wave produced by an infield explosion of a 1.42-kg composite
charge demonstrated its high performance characteristics. Measurements at blast wave amplitudes of 1 to 20 atm gave a TNT
equivalent in pressure of up to 3 and a TNT equivalent in impulse of 1.3 to 1.8. The high parameters of blast waves in an
unconfined space originate from both the high-energy characteristics of the systems themselves and the afterburning of excess
metal fuel in air. To estimate the extent of participation of the reaction of excess metal fuel with air in supporting the
blast wave, numerical simulations of the generation of blast waves for various rates of mixing of detonation products with
air at the contact surface were conducted. The main elements of the mechanisms of the processes that determine the efficiency
of explosive systems with a heat release spread in space and time were considered. It was concluded that an optimal regime
of blast wave generation, capable of ensuring a prolonged attenuation of the wave with the distance, could be realized for
low-velocity detonation. 相似文献
2.
A. A. Sulimov A. A. Borisov B. S. Ermolaev M. K. Sukoyan V. E. Khrapovskii P. V. Komissarov 《Russian Journal of Physical Chemistry B, Focus on Physics》2009,3(5):789-797
The results of experimental studies of the nonideal detonation of high-density, high-energy aluminum-ammonium perchlorate-organic
fuel-HE compositions and of the blast waves it generates in a channel filled with air are presented. Aluminum-enriched compositions
have high densities (up to 2 g/cm3) and high heats of explosion, nearly twice that for TNT. The studies were performed to work out scientific fundamentals of
controlling nonideal detonation and to explore the possibility of creating new high-energy high-density formulations with
an enhanced fugacity effect. The factors that enable controlling the nonideal detonation of such charges were determined.
It was demonstrated that, at RDX contents above 15%, the detonation velocity increases linearly with the charge density while
the critical detonation diameter decreases. Adjusting the density, HE content, ratio of the components makes it possible to
vary the detonation velocity in high-density charges over a wide range, from 4 to 7 km/s. The experimental data were compared
to the thermodynamically calculated velocity of ideal detonation. For the compositions under study, the pressure- time histories
of the blast wave generated in a cylindrical tube by the expanding detonation products at different distances from the charge
were measured. The results were compared to analogous data obtained under the same conditions for the detonation of the same
mass of TNT (100 g). The parameters of blast waves generated by the test compositions are markedly superior to those characteristic
of TNT: the pressure at the leading front of the wave and pressure impulse at a given distance from the charge were found
to be 1.5–2.0 (or even more) times those observed for TNT. The TNT equivalency at pressures 30–60 atm has similar values.
The TNT equivalencies in pressure and pressure impulse depend nonmonotonically on the distance from the charge, so far unclear
why. It was established that the interaction between excess fuel and air oxygen during the expansion of detonation products
contributes little to supporting the blast wave. 相似文献
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A. N. Luzin 《Russian Physics Journal》1968,11(3):65-68
The problem of the collision of two semibounded crystals, considered in [1], is generalized to the case of a lattice containing one isotopic defect. The solution is obtained in integral form. An analysis of the asymptotic behavior of the solution as t= shows that local oscillations of an impurity atom and its neighbors are excited only when this atom is located near the plane dividing the crystal into two colliding parts. 相似文献
5.
A. A. Valuev A. S. Kaklyugin G. É. Norman 《Journal of Experimental and Theoretical Physics》1998,86(3):480-488
This paper shows how the concepts commonly used for a Debye plasma—Landau damping, collisional damping, short-range and long-range
collisions, and plasma waves—must be revised to describe a nonideal electron-ion plasma. The degrees of freedom of a nonideal
plasma are divided into collective and individual. The increase and saturation of the fraction of collective degrees of freedom
as the coupling constant increases is discussed. The Tatarskii approach for a system of coupled oscillators makes it possible
to model the collective degrees of freedom of a nonideal plasma by a set of Langevin oscillators in a thermostat. The correlation
energy and the energy of the plasma waves are found. The concepts developed here made it possible to determine the dispersion
of the plasma waves and their damping. The effect of damping on the discrepancy between the position of the maximum of the
dynamic structure factor and the real part of the solution of the dispersion equation is considered. The effective collision
frequency of the individual degrees of freedom (the electrons) is estimated, taking into account both short-range pairwise
scattering and scattering at plasma waves.
Zh. éksp. Teor. Fiz. 113, 880–896 (March 1998) 相似文献
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The peculiarities of propagation of acoustic excitations through an imperfect 1D superlattice are studied in the virtual crystal approximation. The dependence of the lowest acoustic band gap of a nonideal (disordered in composition) two-sublattice 1D phonon crystal on the concentration of impurity layers is simulated numerically. 相似文献
8.
The flow of bubbly fluid comprising a mixture of bubbles filled with explosive and inert gases, which is driven through a converging channel, was studied. Depending on the velocity of the hummer hitting the bubbly fluid boundary, the flow may be accompanied by the development of detonation waves which compress the bubbles with inert gas. 相似文献
9.
The generation of a magnetic field by a system of detonation waves in a condensed explosive is reported. The convergence of the detonation waves, which exhibit a high conductivity in the chemical reaction zone, increases the magnetic field at the axis of the system. The fact of magnetic field generation is demonstrated experimentally. Features of the new method of magnetic cumulation are discussed. A simple compression model that qualitatively agrees with experimental data is proposed. 相似文献
10.
Spin detonation of fuel-air mixtures in a cylindrical combustor 总被引:1,自引:0,他引:1
11.
Fortov VE Ilkaev RI Arinin VA Burtzev VV Golubev VA Iosilevskiy IL Khrustalev VV Mikhailov AL Mochalov MA Ternovoi VY Zhernokletov MV 《Physical review letters》2007,99(18):185001
High-explosive driven generators of cylindrical and plane shock waves in D2 and H2 were used for the generation of warm and dense strongly nonideal matter with an intense interparticle interaction and Fermi statistics. Highly resolved flash x-ray diagnostics were used to measure the adiabatic plasma compressibility. The thermodynamic measurements demonstrated the 20% increase of density at megabar pressure, just in the density range, where the electrical measurements indicated a sharp--5 orders of magnitude--increase of electrical conductivity due to pressure ionization in strongly coupled plasmas. 相似文献
12.
We investigate theoretically and experimentally the capillary-gravity waves created by a small object moving steadily at the water-air interface along a circular trajectory. It is well established that, for straight uniform motion, no steady waves appear at velocities below the minimum phase velocity c(min)=23 cm s(-1). We demonstrate that no such velocity threshold exists for a steady circular motion, for which, even for small velocities, a finite wave drag is experienced by the object. This wave drag originates from the emission of a spiral-like wave pattern. Our results are in good agreement with direct experimental observations of the wave pattern created by a circularly moving needle in contact with water. Our study leads to new insights into the problem of animal locomotion at the water-air interface. 相似文献
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A theoretical solution is proposed to predict acoustic waves generated in a homogeneous and isotropic hollow cylinder by a laser line source under either ablation or thermoelastic regime. The Fourier series expansion is introduced for one spatial coordinate to solve this transient response problem. Theoretical displacements are obtained in both regimes for aluminum hollow cylinders with various thickness including a rod of the same size. The corresponding displacements are observed experimentally by the laser ultrasonic technique. Agreement has been found in the time arrival, shape and relative amplitude of surface waves and various longitudinal and transverse bulk waves. These acoustic waves are further identified by the ray trajectory analysis. This work will be helpful when dealing with the inverse problem of the nondestructive evaluation of hollow cylindrical parts. 相似文献
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A nonlinear 1D model of longitudinal wake waves generated in a relativistic epi plasma by an ultrarelativistic modulated proton
bunch is developed. The model is used for constructing the score of concentration profiles of the concentrations of the plasma
component in the wake wave. It is shown that the wave period increases with the concentration of the ion component of the
plasma and with the proton bunch density. 相似文献
19.
B. P. Aduev G. M. Belokurov S. S. Grechin A. V. Puzynin 《Russian Journal of Physical Chemistry B, Focus on Physics》2010,4(3):449-451
The results of measurements of the velocity of shock waves generated in pressed pentaerythritol tetranitrate samples by a
pulsed electron beam (0.25 MeV, 15 J/cm2, and 20 ns) and of the velocity of expansion of the explosion products into vacuum are presented. It was demonstrated that,
during the interaction of the electron beam with pentaerythritol tetranitrate, it experiences decomposition accompanied by
a pressure rise high enough to produce a shock-wave initiation of the sample. 相似文献