Ignition of petn particles by a gas-detonation wave

Григорьев, В. В.; Luk’yanchikov, L. A.; Pruuél, É. R.

doi:10.1007/bf02671921

Cited by 4 publications

(5 citation statements)

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“…Thus, the diameter d * cr , similarly to the critical diameter of ordinary detonation d cr , determines the limiting conditions of high-velocity convective combustion, whose propagation mechanism is not completely understood (it is obviously not a shock-wave one). Following [18][19][20], we will call such high-velocity combustion ablation combustion.…”

Section: Results Of Experimentsmentioning

confidence: 99%

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Ablation combustion of secondary powder explosives

Luk’yanchikov

Pruuél

Kashkarov

et al. 2010

J Appl Mech Tech Phy

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The explosive transformation in a passive charge initiated by an air shock wave was studied using synchrotron diagnostics of density. It was found that in the passive charge, a compression wave capable of forming effective hot spots does not arise and classical initiation conditions do not occur. The development of the reaction can be attributed to the ablation combustion observed in studies of the initiation of secondary powder explosives by a spark and gaseous detonation.

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Section: Results Of Experimentsmentioning

confidence: 99%

“…The specific ignition conditions were studied experimentally in great detail in [20] using multibeam pyrometry. This made it possible to measure the ignition delay of dispersed PETN particles in a gas detonation wave.…”

Section: On the Mechanism Of High-velocity Combustionmentioning

confidence: 99%

Ablation combustion of secondary powder explosives

Luk’yanchikov

Pruuél

Kashkarov

et al. 2010

J Appl Mech Tech Phy

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“…Thus, compositions with a thick liquid layer are being developed, leading to the necessity of estimating and describing the generally unsteady behavior of this layer at any site of the blown burning surface, and in particular, at the site of sudden flow expansion. The hypothesis of melt tearing down from the burning particle surface by gas flow was used for plausible explanation of experimental results [16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of unsteady solid-propellant combustion models (review)

Gusachenko

Зарко

2008

Combust Explos Shock Waves

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Recent studies of solid-propellant combustion models are briefly analyzed. The models are divided into purely one-dimensional (classical and phenomenological models with various generalizations of the Zel'dovich approach) and non-one-dimensional. The latter include models with local non-one-dimensionality, which is always accompanied by local unsteadiness. This all can be eliminated by averaging. The main disadvantage of unsteady solid-propellant combustion models, which is no fault of their authors, is the same as in the case of steady-state models: the lack of detailed information on chemical and physical processes in the condensed phase. Impropriety of extending the purely one-dimensional approach to the instability region is noted. Possible directions for further development of unsteady (and quasi-steady-state) solid-propellant combustion models for homogeneous compositions may involve accounting for local non-one-dimensionality and the unsteadiness due to instability of the subsurface reactions zone and verification of the possibility of the existence of chemical instability capable of causing similar non-one-dimensionality and unsteadiness.

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“…At lower pressures of the mixture, the reaction is not observed over the entire time of recording (30 #sec). In [9], such a nature of the entrance of PETN into the reaction was explained by development of instabilities in the micron-size layer of melt on the surface of the HE grains under the action of the flow of gas-detonation products. For the experimental conditions of [9], the thermal parameters of the detonation products are such that heating and melting can proceed to precisely this depth.…”

mentioning

confidence: 97%

“…A disadvantage of this approach is that the process of formation of this layer itself is elimination from consideration. This concept was further developed in [9], where the interaction of individual PETN crystals with a gas detonation wave in a stoichiometric mixture of acetylene and oxygen was studied. This concept was developed with allowance for the weU-known facf that a gas detonation can excite the same transient process as that occurring in spark and dynamic initiation [10].…”

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confidence: 98%

Initiation systems using secondary explosives

Luk’yanchikov¹

2000

J Appl Mech Tech Phys

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The work in this area directed by M. A. Lavrent'ev was begun even in 1956 at the Moscow Physicotechnical Institute. Cumulation and flows in water and ground explosions were studied, and methods of high-velocity particle acceleration for problems of space engineering were developed. In 1957, most of the creative team moved to the newly founded Institute of Hydrodynamics of the Siberian Division, but until 1958, studies were performed on the experimental facilities at the Moscow Physicotechnical Institute.Most explosive experiments require strict synchronization using microsecond detonators. Such a detonator was designed on the basis of RDX powder initiated by a pulsed spark discharge. It had a simple design and low sensitivity to external action.In 1961, the Central Institute of Underground Mining Engineering presented a proposal to M. A. Lavrent'ev that shaped charges be employed for blasting of hard rocks. Over a short time, preliminary. experiments were performed, and they confirmed the effectiveness of this blasting method. Therefore, the need arose to design an explosive actuating device for sequential explosion of a large number of simple charges delivered at specified points in a working space. Such an initiation system was designed on the basis of high-voltage, high-current detonators using secondary high explosives (HE).Soon it was suggested that shaped charges be also used to solve another problem --designing a mechanized explosive installation for explosive forming of the fuselage of MiG-25 aircraft. The MiG-25 airframe was manufactured using new superstrong stainless steels, which, because of their low plasticity, could be molded only by a sequential explosion of a large number of small charges. This technology could be implemented only by explosive automatic control units ensuring a low cost of each explosion. Design of such devices was performed with participation of the Institute of Hydrodynamics of the Siberian Division Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090.

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Ignition of petn particles by a gas-detonation wave

Cited by 4 publications

References 0 publications

Ablation combustion of secondary powder explosives

Ablation combustion of secondary powder explosives

Analysis of unsteady solid-propellant combustion models (review)

Initiation systems using secondary explosives

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