共查询到20条相似文献,搜索用时 125 毫秒
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I. F. Kobylkin 《Combustion, Explosion, and Shock Waves》2006,42(2):223-226
This paper deals with the further development of the quantitative theory of critical detonation diameter that was earlier
proposed by the author. According to this theory, to calculate the critical diameter, it is necessary to know the shock adiabat,
detonation velocity, and the generalized kinetic characteristic of decomposition of a high-explosive (HE) charge under shock-wave
compression. It is suggested that the generalized kinetic characteristic of decomposition of a HE can be found from an experimental
dependence of the shock-wave amplitude on the distance the shock wave travels during shock-wave initiation of the HE charge.
This approach allows one to calculate the critical detonation diameters of HE charges with sufficient accuracy.
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Translated from Fizika Goreniya i Vzryva, Vol. 42, No. 2, pp. 112–115, March–April, 2006. 相似文献
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Density dependence of detonation velocity for some explosives 总被引:1,自引:0,他引:1
V. V. Sil’vestrov 《Combustion, Explosion, and Shock Waves》2006,42(4):472-479
The nonmonotonic dependence of the detonation velocity of a cylindrical charge on density for explosives of the 2nd type is
due to the effect of the finite charge diameter and is related to an increase in the width of the reaction zone with a reduction
in the porosity of the explosive.
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Translated from Fizika Goreniya i Vzryva, Vol. 42, No. 4, pp. 116–124, July–August, 2006. 相似文献
4.
M. D. Tarasov I. I. Karpenko V. A. Sudovtsov A. I. Tolshmyakov 《Combustion, Explosion, and Shock Waves》2007,43(4):465-467
The detonation temperature of pressed PETN grains with a relative volumetric concentration of air pores of 0.0047–0.147 was
measured using an optical fiber pyrometer at wavelengths of 678 and 487 nm. The nonequilibrium nature of the radiation of
the detonation front was shown to be due to the presence of two radiation sources with different temperatures. One source
was the explosion products and the other was the strongly compressed air pores, in which air was heated to a temperature above
104 K.
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Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 4, pp. 108–110, July–August, 2007. 相似文献
5.
N. V. Kozyrev B. V. Larionov G. V. Sakovich 《Combustion, Explosion, and Shock Waves》2008,44(2):193-197
The effect of the particle size of HMX in alloys with TNT on the synthesis of nanodiamonds in a detonation wave was studied experimentally. Mixtures with a TNT content of 40 to 90% and the specific surface area of HMX varied in the range of 5–510 m2/kg were investigated. For all mixtures, an increase in the particle size of HMX was found to lead to an increase in the yield of nanodiamonds with the maximum yield shift toward alloys with increased TNT content. The results are explained using a model based on the absence of thermodynamic equilibrium between the components of the heterogeneous explosive during detonation. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 79–84, March–April, 2008. 相似文献
6.
N. V. Kozyrev 《Combustion, Explosion, and Shock Waves》2008,44(6):698-703
The tracer method was used to study the synthesis of nanodiamonds during detonation of composite explosives. Alloys of TNT
with RDX, HMX, PETN, and benzotrifuroxan were studied. It was shown that, in all cases, most nanodiamonds were formed from
TNT carbon. It was concluded that during the chemical reaction in the detonation wave propagating in heterogeneous explosives,
equilibrium parameters were not established. In homogeneous TNT/PETN mixtures, individual components react with each other
to form common products.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 6, pp. 92–98, November–December, 2008. 相似文献
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Continuous spin detonation of hydrogen-oxygen mixtures. 1. Annular cylindrical combustors 总被引:2,自引:0,他引:2
F. A. Bykovskii S. A. Zhdan E. F. Vedernikov 《Combustion, Explosion, and Shock Waves》2008,44(2):150-162
A comprehensive numerical and experimental study of continuous spin detonation of a hydrogen-oxygen mixture in annular combustors
with the components supplied through injectors is performed. In an annular combustor 4 cm in diameter, burning of a hydrogen-oxygen
gas mixture in the regime of continuous spin detonation is obtained. The flow structure is considered for varied flow rates
of the components of the mixture and the combustor length and shape. The dynamics of the transverse detonation wave is numerically
studied in a two-dimensional unsteady statement of the problem with the geometric parameters of the combustors consistent
with experimental ones. A comparison with experiments reveals reasonable agreement in terms of the detonation velocity and
pressure in the combustor. The calculated size and shape of detonation fronts are substantially different from the experimental
data.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 32–45, March–April, 2008. 相似文献
8.
A. N. Dremin 《Combustion, Explosion, and Shock Waves》2008,44(4):444-450
Based on previously published results on the detonation of gaseous and liquid explosives, an explanation is given to the formation of the two-dimensional cellular structure of the detonation front of some gas mixtures undergoing a two-step exothermic transformation at the wave front and suggestions are proposed for the mechanism of development of the two-dimensional cellular structure in the case of detonation transformation of gas mixtures with one-step chemical kinetics. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 4, pp. 80–86, July–August, 2008. 相似文献
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V. F. Anisichkin 《Combustion, Explosion, and Shock Waves》2007,43(5):580-586
An analysis is performed of experimental data from isotopic tracer studies of the detonation mechanism and formation of the
diamond phase of carbon in the detonation products of TNT, RDX, HMX, and their mixtures. Dependences of the relative yield
and phase composition of carbon in the detonation products of components of composite explosives on the particle sizes of
the explosives are given.
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Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 5, pp. 96–103, September–October, 2007. 相似文献
11.
Initiation and propagation of detonation in dry and water-filled explosive charges of small diameter
V. V. Andreev A. Ya. Dammer L. A. Luk'yanchikov 《Combustion, Explosion, and Shock Waves》1994,30(4):566-568
Experiments are conducted to study the initiation and propagation of detonation in dry and water-filled detonating fuses. The structure of the detonation front is studied by electromagnetic methods and high-speed photography of luminescence at the end of the fuse. It is shown that moistening of the charge suppresses nonideal detonation regimes. Such regimes account for the sensitivity of the explosive to the formation of weak shock waves.Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630090. Translated from Fizika Goreniya i Vzryva, Vol. 30, No. 4, pp. 164–166, July–August, 1994. 相似文献
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V. M. Mochalova A. V. Utkin V. A. Garanin S. I. Torunov 《Combustion, Explosion, and Shock Waves》2009,45(3):320-325
A VISAR laser interferometer was used to measure mass velocity profiles in steady-state detonation waves in tetranitromethane
and its mixtures with methanol. In the experiments with tetranitromethane, the chemical-spike pressure was found to be 1.7
times higher than the Chapman-Jouguet pressure. In mixtures with nearly stoichiometric methanol concentrations, the detonation
front remained stable, but the chemical-spike amplitude increased suddenly and the shock broadened, probably due to the decomposition
of the explosive at the front. A 50% increase in methanol concentration led to instability of the detonation front manifested
in oscillations in the mass velocity profiles.
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Translated from Fizika Goreniya i Vzryva, Vol. 45, No. 3, pp. 95–100, May–June, 2009. 相似文献
14.
F. Virot B. Khasainov D. Desbordes H. -N. Presles 《Combustion, Explosion, and Shock Waves》2009,45(4):435-441
We present the results of a numerical study of the detonation structure in a reactive mixture whose chemical energy is released in two steps of very different characteristic times. Detonation in these mixtures exhibits a double detonation cellular structure. By decreasing the detonation tube diameter, several detonation structures are successively obtained: a multiheaded double cellular structure, a double cellular structure with a spinning mode of the transverse wave of the second exothermic step, a single cellular structure, and a spinning mode of the transverse wave of the first step. This is the first three-dimensional numerical investigation of such mixtures. Although a lack of resolution does not allow a resolution of the fine structure at the beginning of the large detonation cells, the results agree qualitatively with experiments. __________ Translated from Fizika Goreniya i Vzryva, Vol. 45, No. 4, pp. 101–108, July–August, 2009. 相似文献
15.
I. F. Kobylkin 《Combustion, Explosion, and Shock Waves》2011,47(1):96-102
The critical detonation diameter of industrial explosive charges is analyzed as a function of their state characteristics
(composition, density, and structure) and the presence of a casing. The main reason for the increase in the critical diameter
with increasing density of ammonium nitrate explosive charges is the reduction in the energy release rate in the chemical
reaction zone of the detonation wave. The effect of the particle size of the components and the amount of the sensitizing
component on the critical diameter of powdered and granular explosives fits into the concept of explosive combustion. An analytical
formula for the critical detonation diameter of emulsion explosives is obtained which correctly describes experimental data.
A possible mechanism of the effect of metal casings on the critical detonation diameter is considered for porous explosives
whose detonation velocity is lower than the sound velocity in the casing. 相似文献
16.
Methods for determining the propellant performance of high explosives (HEs) are considered. The common and distinguishing
features of the techniques of end acceleration of plates and shell expansion are shown. Experimental data on the propellant
performance of individual explosives are given. The influence of metal additives on the brisance (propellant performance)
and blast effect of explosive compositions is considered. A theoretical method for estimating the propellant performance is
proposed, and the propellant performance of hydrogen-free HEs is calculated using experimental data on the enthalpies of formation
and densities of single crystals. The energy output and detonation velocity limits of organic HEs are considered and estimated.
Promising directions in the investigation of the properties of HEs are considered.
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Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 1, pp. 99–111, January–February, 2007. 相似文献
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Continuous spin detonation of fuel-air mixtures 总被引:12,自引:0,他引:12
F. A. Bykovskii S. A. Zhdan E. F. Vedernikov 《Combustion, Explosion, and Shock Waves》2006,42(4):463-471
Results of an experimental study of controlled continuous spin detonation of acetylene-air and hydrogen-air mixtures, as well
as propane-air-oxygen and kerosene-air-oxygen mixtures in a flow-type cylindrical combustor 30.6 cm in diameter are described.
The flow structure and the conditions, properties, and areas of existence of continuous detonation are considered.
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Translated from Fizika Goreniya i Vzryva, Vol. 42, No. 4, pp. 107–115, July–August, 2006. 相似文献
19.
I. F. Kobylkin 《Combustion, Explosion, and Shock Waves》2009,45(3):326-330
Correlation dependences between the critical diameter of high explosive (HE) charges and characteristics of their shock-wave
sensitivity are theoretically justified. Relations for the critical radius of curvature of the detonation-wave front and for
the critical detonation diameter are derived on the basis of the author’s theory of the critical diameter and the generalized
kinetic characteristic of HE decomposition determined from the experimental dependence of the distance of transition of the
initiating shock wave to the detonation wave on the wave amplitude. A qualitative analysis of these relations reveals good
agreement with available experimental data. Key words: detonation, critical diameter, sensitivity, shock-wave initiation of
detonation, HE decomposition kinetics.
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Translated from Fizika Goreniya i Vzryva, Vol. 45, No. 3, pp. 101–105, May–June, 2009. 相似文献
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S. A. Zhdan F. A. Bykovskii E. F. Vedernikov 《Combustion, Explosion, and Shock Waves》2007,43(4):449-459
A two-dimensional unsteady mathematical model of spin detonation in an annular cylindrical ramjet-type combustor is formulated.
The wave dynamics in the combustor filled by a hydrogen-oxygen mixture is studied numerically.
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Translated from Fizika Goreniya i Vzryva, Vol. 43, No. 4, pp. 90–101, July–August, 2007. 相似文献