Accurate measurements of detonation pressure and detonation reaction zones of several commonly-used explosives

SHU Junxiang; PEI Hongbo; HUANG Wenbin; ZHANG Xu; ZHENG Xianxu

doi:10.11883/bzycj-2021-0305

Volume 42 Issue 5

May 2022

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SHU Junxiang, PEI Hongbo, HUANG Wenbin, ZHANG Xu, ZHENG Xianxu. Accurate measurements of detonation pressure and detonation reaction zones of several commonly-used explosives[J]. Explosion And Shock Waves, 2022, 42(5): 052301. doi: 10.11883/bzycj-2021-0305

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SHU Junxiang, PEI Hongbo, HUANG Wenbin, ZHANG Xu, ZHENG Xianxu. Accurate measurements of detonation pressure and detonation reaction zones of several commonly-used explosives[J]. Explosion And Shock Waves, 2022, 42(5): 052301. doi: 10.11883/bzycj-2021-0305

Citation:

SHU Junxiang, PEI Hongbo, HUANG Wenbin, ZHANG Xu, ZHENG Xianxu. Accurate measurements of detonation pressure and detonation reaction zones of several commonly-used explosives[J]. Explosion And Shock Waves, 2022, 42(5): 052301. doi: 10.11883/bzycj-2021-0305

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Accurate measurements of detonation pressure and detonation reaction zones of several commonly-used explosives

doi: 10.11883/bzycj-2021-0305

Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2021-07-16
Rev Recd Date: 2021-11-02

Available Online: 2022-03-30

Publish Date: 2022-05-27

Abstract

Abstract

The detonation pressure and detonation reaction zone are important for the detonation performance evaluation of explosives. In order to obtain the reaction zone parameters of several common high explosives, the detonation wave profiles in TNT, PETN, RDX, HMX, TATB and CL-20 based explosives were experimentally measured with photon Doppler velocimetry (PDV). The explosive samples were initiated by explosive plane-wave lenses or a powder gun, and the thickness of the samples was more than 10 mm to insure a stable detonation in the test area. A transparent LiF window covered by a 0.7-μm-thick aluminum reflective coating on the distal side was attached to the explosive sample, and the particle velocity histories of the interface between the explosive and window were measured with PDV. The Chapman-Jouguet (CJ) point was determined by the inflexion point in the corresponding profile or the separation point of the particle velocity histories for samples of different lengths. The CJ pressure was calculated using the impedance matching method. The pressure at the von Neumann (VN) spike was also obtained. The results show that for ideal explosives such as PETN, RDX, HMX and CL-20, the interface particle velocity profiles show a distinct end of the reaction zone, and the detonation reaction zones are narrow. The detonation reaction time is between 7 ns and 15 ns for those ideal explosives. For TNT and TATB based explosives, measurements show an indistinct end of the reaction zone because the reaction of solid carbon formation is slow, and the detonation reaction time is about (100±15) ns and (255±20) ns, respectively. The ratio of the measured spike pressure to CJ pressure of the explosives ranges from 1.22 to 1.46. The analysis indicates that the relative expanded uncertainty of the detonation pressure measured with PDV is 4.4% at k=2, and the uncertainty of the detonation reaction time is 2－4 ns for those ideal explosives or 10－20 ns for those unideal explosives.
- detonation pressure,
- detonation zone length,
- laser velocity interferometry,
- CL-20,
- explosion measuring technique

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References(25)

References

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