Experimental study on detonation wave profiles in RDX-based aluminized explosives

DING Tong; PEI Hongbo; GUO Wencan; ZHANG Xu; ZHENG Xianxu; LIU Cangli

doi:10.11883/bzycj-2021-0217

Volume 42 Issue 6

Jun. 2022

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DING Tong, PEI Hongbo, GUO Wencan, ZHANG Xu, ZHENG Xianxu, LIU Cangli. Experimental study on detonation wave profiles in RDX-based aluminized explosives[J]. Explosion And Shock Waves, 2022, 42(6): 062301. doi: 10.11883/bzycj-2021-0217

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DING Tong, PEI Hongbo, GUO Wencan, ZHANG Xu, ZHENG Xianxu, LIU Cangli. Experimental study on detonation wave profiles in RDX-based aluminized explosives[J]. Explosion And Shock Waves, 2022, 42(6): 062301. doi: 10.11883/bzycj-2021-0217

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Experimental study on detonation wave profiles in RDX-based aluminized explosives

doi: 10.11883/bzycj-2021-0217

1.
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China
2.
China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2021-05-27
Rev Recd Date: 2021-11-08

Available Online: 2022-05-30

Publish Date: 2022-06-24

Abstract

Abstract

In order to evaluate the reaction of the aluminum powder in detonation products of aluminized explosives, experimental measurements of the detonation wave profiles in RDX/Al and RDX/LiF explosives using photon Doppler velocimetry (PDV) were performed. Planar detonations were produced by impacting the explosives with sapphire flyers in a gas gun. LiF windows with very thin vapor deposited aluminum mirrors were used in the experiments. The original data obtained in the experiments were processed by the window Fourier transform method, then the pressure in the detonation reaction zone was calculated using the impedance matching formula. The initial reaction times were compared between the Al powders with the Al particle sizes of 2 and 10 μm by averaging the interface particle velocities at multiple locations measured in each experiment. Simultaneously, the isentropic equation of state of LiF was used as the reference line to construct the equation of state of the aluminized explosives and to analyze the reaction degrees of the Al powders. The results show that the detonation wave profiles in the aluminized explosives are different from those in ideal explosives. And measurements show no distinct end to the reaction zone indicating a CJ point. At the beginning, the interface particle velocity in the RDX/Al explosive is lower than that in the RDX/LiF explosive due to the temperature disequilibrium between the Al particles and gas detonation products. Subsequently, the interface particle velocity in the RDX/Al explosive is higher than that in the RDX/LiF explosive due to the energy released by the reaction of aluminum. Micron-sized Al particles hardly react before the CJ front. And for the Al particles with the sizes of 2 and 10 μm, the Al reaction delay time is less than 0.8 μs. At the end of the measurements, the evaluated Al reaction degree was about 16% to 31%.
- aluminized explosive,
- detonation reaction zone,
- photon Doppler velocimetry (PDV),
- reaction delay time,
- interface particle velocity

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References(23)

References

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