Shock initiation of detonation in a mixture of gelled nitromethane with microballoons

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Abstract

Using a multichannel laser interferometer, a series of experiments with recording of particle velocity profiles have been carried out to determine the dynamics of shock initiation of detonation in the mixtures of nitromethane with microballoons, which are heterogeneous explosives with a controlled charge structure. It is shown that the addition of 5–8 wt.% microballoons to nitromethane reduces the shock wave amplitude required to initiate detonation by almost an order of magnitude. At 8 wt.% of microballoons, depending on the initiation conditions, the realization of both steady Chapman-Jouguet detonation and weak detonation is observed.

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About the authors

M. Yu. Shakula

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences; Moscow Institute of Physics and Technology

Email: utkin@icp.ac.ru
Russian Federation, Chernogolovka, Moscow region; Dolgoprudnyy, Moscow region

A. V. Utkin

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: utkin@icp.ac.ru
Russian Federation, Chernogolovka, Moscow region

V. M. Mochalova

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: utkin@icp.ac.ru
Russian Federation, Chernogolovka, Moscow region

V. V. Lavrov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: utkin@icp.ac.ru
Russian Federation, Chernogolovka, Moscow region

A. V. Savchenko

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences

Email: utkin@icp.ac.ru
Russian Federation, Chernogolovka, Moscow region

V. V. Vilkov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences; Lomonosov Moscow State University

Email: utkin@icp.ac.ru
Russian Federation, Chernogolovka, Moscow region; Moscow

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Supplementary files

Supplementary Files
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2. Fig. 1. Schematic diagram of the experiments on shock-wave initiation of detonation.

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3. Fig. 2. Schematic diagram of shock-wave initiation of detonation of liquid explosives.

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4. Fig. 3. Velocity profiles at the boundary with water for nitromethane.

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5. Fig. 4. Velocity profiles at the boundary with water for a mixture of nitromethane with 5 wt.% microspheres.

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6. Fig. 5. Evolution of the wave profile in t–x coordinates for a mixture of nitromethane with 5 wt.% microspheres.

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7. Fig. 6. Velocity profiles at the boundary with water for a mixture of nitromethane with 8 wt.% microspheres.

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8. Fig. 7. Evolution of the wave profile in t–x coordinates for a mixture of nitromethane with 8 wt.% microspheres.

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9. Fig. 8. Mass velocity profiles at the water interface for a mixture of nitromethane with 8 wt% microspheres at high initiation pressure.

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