Two-phase low-speed detonation of a porous explosive

Андреев, В. В.; Ершов, А. П.; Luk’yanchikov, L. A.

doi:10.1007/bf00782921

Cited by 5 publications

(8 citation statements)

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“…The maximum pressure in the wave calculated with allowance for these conditions is equal to 200 MPa. Direct pressure measurements performed later (see [7]) with an error not higher than 10% using piezoelectric transducer coincided with these results. According to [8], compression in this wave cannot lead to formation of effective chemical reaction centers.…”

supporting

confidence: 83%

“…We assumed that the failure of the condensed phase is strongly affected by ablation effects that occur during flow of a high-enthalpy gas around the HE surface and considerably increase the burning rate of the gains. This hypothesis is proposed in [7] to explain the anomalously high burning rates. According to this hypothesis, the total rate of regression of the condensed phase is determined by the rate of failure of the evaporated layer due to instabilities that arise in this layer when it is in the high-velocity flow of combustion products.…”

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confidence: 96%

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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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supporting

confidence: 83%

mentioning

confidence: 96%

Initiation systems using secondary explosives

Luk’yanchikov¹

2000

J Appl Mech Tech Phys

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“…Let us show that the regime considered above has characteristics similar to those of high-velocity convective combustion of secondary powder explosives initiated by a pulsed spark discharge and overdriven gaseous detonation [11][12][13][14][15].…”

Section: Results Of Experimentsmentioning

confidence: 99%

“…In [13], the regime corresponding to region 2 in Fig. 9 was calculated for a one-dimensional model of a multivelocity two-phase medium.…”

Section: Results Of Experimentsmentioning

confidence: 99%

“…The high-velocity convective combustion considered here has another property characteristic only of the process behind a shock wave. Figure 12 gives the results of investigation of the kinematics of the transition regime occurring during spark initiation of bulk PETN [13]. The bulk PETN charge was placed in Plexiglas tubes of various diameters with 1 mm thick walls.…”

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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