Model of the explosive traces appearance mechanism in the detonation products
Authors: Andreev S.G., Boiko M.M., Chernov A.I.
Published in issue: #2(158)/2025
DOI: 10.18698/2308-6033-2025-2-2421
Category: Mechanics | Chapter: Mechanics of Liquid, Gas, and Plasma
The paper considers a detonation complex propagating along the open cylindrical charge in relation to the problems of restoring information on the energetic materials from their traces in the explosion products. It establishes that, under the non-ideal detonation, three zones of the reacting medium flow could be distinguished, where the explosive passes sequentially from the charge initial state to the final explosion products with traces of the explosive. In this case, upon exiting the first zone (detonation front in the non-ideal detonation) and depending on the critical detonation diameter ratio to the charge diameter, as well as on the charge chemical composition and microstructure, the undecomposed explosive mass fraction lies in the range of 5...30% (and even 80%). After extinction due to the pressure drop in the second zone, the charge particles remain and enter the third zone, where certain explosive grains could ignite and burn due to excitation of the thermal explosion. The paper shows that size of the charge particles in the initial state, which after its detonation could form the charge traces, is directly determined by the combustion law and the explosive kinetic characteristics. Correlation in size of the resulting traces with the critical charge diameter is indirect due to the fact that a decrease in the ratio of the critical detonation diameter to the charge diameter leads to an increase in pressure, density and temperature of the gaseous explosion products, as the explosive particles surrounding them are facing combustion, extinction and flash.
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References
[1] Dremin A.N., Savrov S.D., Trofimov V.S., Shvedov K.K. Detonatsionnye volny v kondensirovannykh sredakh [Detonation waves in the condensed media]. Moscow, Nauka Publ., 1970.
[2] Trofimov A.N., Dremin A.N. O strukture fronta neidealnoy detonatsii v tverdykh VV [On the structure of the non-ideal detonation front in solid explosives]. Fizika goreniya i vzryva — Combustion, Explosion and Shock Waves, 1971, vol. 7, no. 3, pp. 427–428.
[3] Andreev S.G., Perevalov I.A., Boyko M.M., Klimenko V.Yu. Analiticheskaya model neidealnoy detonatsii i printsip Kharitona [Analytical model of the non-ideal detonation and the Khariton principle]. In: Ekstremalnye sostoyaniya veshchestva. Detonatsiya, udarnye volny. Trudy Mezhdunarodnoy konferentsii XI Kharitonovskie chteniya, Rossiya [Extreme states of matter. Detonation, shock waves. Proceedings of the International Conference XI Kharitonov Readings, Russia]. Sarov, RFYaTs-VNIIEF Publ., 2009, pp. 89–94.
[4] Wood W.W., Kirkwood J.G. Diameter Effect in condensed explosives. The relation between velocity and radius of curvature of the detonation wave. J. Chem. Phys., 1954, vol. 22, no. 11, pp. 1920–1924.
[5] Boyko M.M., Andreev S.G., Vlasova L.N., Solovyev V.S. Vliyanie raskhodimosti potoka na kharakter techeniya produktov detonatsii za frontom DV [Flow divergence effect on the nature of the flow of detonation products behind the detonation front]. Fizika goreniya i vzryva — Combustion, Explosion and Shock Waves, 1987, vol. 23, no. 1, pp. 50–54.
[6] Andreev S.G. Ustanovlenie svyazi kriticheskikh usloviy rasprostraneniya detonatsii so srednimi skorostyami razlozheniya vzryvchatykh veshchestv v detonatsionnykh volnakh [Determining the relationship between critical conditions of detonation propagation and the average decomposition rates of explosives in detonation waves]. Inzhenerny zhurnal: nauka i innovatsii — Engineering Journal: Science and Innovation, 2019, iss. 4. https://doi.org/10.18698/2308-6033-2019-4-1864
[7] Bolkhovitinov L.G. Neidealnaya detonatsiya kondensirovannykh vzryvchatykh veshchestv [Non-ideal detonation of the condensed explosives]. In: Sb. “Vzryvnoe delo” [Journal “Explosion technology”]. Moscow, Nedra Publ., 1976, no. 76/33, pp. 150–164.
[8] Jones H.A. Theory of the dependence of the rate of detonation of solid explosives on the diameter of the charge. Proc. Roy. Soc., 1947, Series A 189, pp. 415–426.
[9] Haskins P.J., Cook M.D., Wood A.D. On the dependence of critical diameter and velocity decrement at failure on the burn law. In: Proceedings of the 33rd International Pyrotechnics Seminar. Fort Collins, USA, 2006, pp. 385–391.
[10] Kennedy D.L. Multi-valued normal shock velocity versus curvature relationships for highly non-ideal explosives. In: 11th Int. Detonation. Symp. Snowmass, Colorado, USA, 1998, pp.181–188.
[11] Assovskiy I.G. Fizika goreniya i vnutrennyaya ballistika [Combustion physics and internal ballistics]. Moscow, Nauka Publ., 2006, 357 p. ISBN 5-02-006395-9.
[12] Frank-Kamenetskiy D.A. K teorii nestatsionarnoy teorii teplovogo vzryva [On the theory of non-stationary thermal explosion]. Zhurn. phys. khim. — Russian Journal of Physical Chemistry, 1949, vol. 20, no. 2, pp. 139–146.
[13] Mader Ch. Numerical Modeling of Detonation. University of California, 1979 [In Russ.: Meyder Ch. Chislennoe modelirovanie detonatsii. Moscow, Mir Publ., 1985].
[14] Dubnov L.V., Bakharevich N.S., Romanov A.I. Promyshlennye vzryvchatye veshchestva [Industrial explosives]. Moscow, Nedra Publ., 1973, 320 p.
[15] Belyaev A.F. Gorenie, detonatsiya i rabota vzryva kondensirovannykh sistem [Combustion, detonation, and explosive work of the condensed systems]. Moscow, Nauka Publ., 1968, 255 p.