Ignition of gas mixture by combustion products of thermite composition Al/CuO

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Abstract

The paper presents new experimental results on the dynamics of the cloud of explosive combustion products of the mechanoactivated composition Al/CuO. The parameters of the cloud of combustion products depending on the mass of the mixture were determined using the methods of high-speed photoregistration, pyrometric measurements, and photovoltaic and electrocontact sensors. Various methods of ignition and formation of the product flow are considered. Optimal conditions for the formation of a torch for ignition of combustible gas–air mixtures have been determined.

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About the authors

Boris D. Yankovskii

Joint Institute for High Temperatures of the Russian Academy of Sciences

Author for correspondence.
Email: yiy2004@mail.ru

Candidate of Science in physics and mathematics, senior research scientist

Russian Federation, 13-2 Izhorskaya Str., Moscow 125412

Sergey Yu. Ananev

Joint Institute for High Temperatures of the Russian Academy of Sciences

Email: serg.ananev@gmail.com

Candidate of Science in physics and mathematics, research scientist

Russian Federation, 13-2 Izhorskaya Str., Moscow 125412

Alexander Yu. Dolgoborodov

Joint Institute for High Temperatures of the Russian Academy of Sciences; N. N. Semenov Federal Research Center for Chemical Physics of the Russian Academy of Sciences; National Research Nuclear University MEPhI

Email: aldol@ihed.ras.ru

Doctor of Science in physics and mathematics, chief research scientist, head of laboratory, teacher

Russian Federation, 13-2 Izhorskaya Str., Moscow 125412; 4 Kosygin Str., Moscow 119991; 31 Kashirskoe Sh., Moscow 115409

Leonid I. Grishin

Joint Institute for High Temperatures of the Russian Academy of Sciences; National Research Nuclear University MEPhI

Email: lenya-grishin@mail.ru

junior research scientist, Ph.D. student

Russian Federation, 13-2 Izhorskaya Str., Moscow 125412; 31 Kashirskoe Sh., Moscow 115409

Galina S. Vakorina

Joint Institute for High Temperatures of the Russian Academy of Sciences

Email: vakorinags@ihed.ras.ru

Candidate of Science in physics and mathematics, leading engineer

Russian Federation, 13-2 Izhorskaya Str., Moscow 125412

References

  1. Dolgoborodov, A. Yu. 2015. Mechanically activated oxidizer–fuel energetic composites. Combust. Explo. Shock Waves 51(1):86–99.
  2. Dreizin E. L., and M. Schoenitz. 2017. Mechanochemically prepared reactive and energetic materials: A review. J. Mater. Sci. 52(20):11789–11809.
  3. Streletskii, A. N., M. V. Sivak, and A. Yu. Dolgoborodov. 2017. Nature of high reactivity of metal/solid oxidizer nanocomposites prepared by mechanoactivation: A review. J. Mater. Sci. 52(20):11810–11825.
  4. Dolgoborodov, A. Yu., V. G. Kirilenko, A. N. Streletskii, I. V. Kolbanev, A. A. Shevchenko, B. D. Yankovskii, S. Y. Ananev, and G. E. Val’yano. 2018. Mehanoaktivirovanyy termitnyy sostav Al/CuO [Mechanoactivated thermite composition Al/CuO]. Goren. Vzryv (Mosk.) — Combustion and Explosion 11(3):117–124.
  5. Polak, L. S., A. A. Ovsyannikov, D. I. Slovetsky, and F. B. Wurzel. 1975. Teoreticheskaya i prikladnaya plazmokhimiya [Theoretical and applied plasma chemistry]. Moscow: Nauka. 304 p.
  6. Kondratiev, V. N., and E. E. Nikitin. 1981. Khimicheskie protsessy v gazakh [Chemical processes in gases]. Moscow: Higher School. 264 p.
  7. Lawton, J., and F. J. Weinberg. 1969. Electrical aspects of combustion. Oxford, U.K.: Clarendon Press. 419 p.
  8. Ananev, S. Y., A. Yu. Dolgoborodov, and B. D. Yankovskii. 2017. Dinamika razleta produktov goreniya mekhanoaktivirovannoy smesi alyuminiya s oksidom medi [Expansion dynamics of combustion products of a mechanically activated mixture of aluminum with copper oxide]. Goren. Vzryv (Mosk.) — Combustion and Explosion 10(4):81–85.
  9. Bratton, K. R., C. Woodruffa, L. L. Campbell, R. J. Heaps, and M. L. Pantoya. 2020. A closer look at determining burning rates with imaging diagnostics. Opt. Laser. Eng. 124:105841.

Supplementary files

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2. Figure 1 Schemes of experimental assemblies for the formation of a thermite mixture combustion torch: 1 — a weighed portion of the thermite mixture; 2 — point of initiation; 3 — cloud of products; 4 — electrical contact sensor; 5 — channel; 6 — target; Mcm — mass of the sample; Einit — spark energy; dchannel — channel diameter; Lchannel — channel length; linit — distance from the initiation point to the open end of the channel; and Lmix — length of the mixture charge in the channel

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3. Figure 2 A typical photograph (a) and graphical representation of the expansion dynamics of the luminous area during burning of a mixture sample in free space: 1 — 0.06 g; 2 — 0.25; 3 — 0.75, and 4 — 1.5 g (b)

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4. Figure 3 Expansion dynamics of the luminous area in time: 1 — 0.06 g; 2 — 0.25; 3 — 0.75, and 4 — 1.5 g

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5. Figure 4 Rate of expansion of the luminous area depending on the weight of the sample: 1 — dV/dt = −0,6M2 + 2,1M; and 2 — dV/dt = 1,5M

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6. Figure 5 A typical photograph of a quasi0cylindrical torch of mixture combustion (0.06 g). The mixture sample was placed in a shell with a depth of 2 mm with one free surface (a); and dynamics of linear expansion (b) and volume increase (c) of the luminous area at different energies of electrospark initiation: 1 — 120mJ; and 2 — 20mJ

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7. Figure 6 Dynamics of expansion of the luminous area (a) and the increase in the torch volume (b) depending on the location of initiation point along the channel depth

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8. Figure 7 The breakdown-burning traces of the flow of reacting mixture particles on a 0.3-millimeter thick polymer target

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9. Figure 8 Photographs of ignition process of propane–butane gas mixture: (a) the initial stage of the initiation process in the chamber; and (b) radiation recorded outside the chamber with the release and afterburning of propane–butane–air mixture outside the chamber

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