Calculation of pressure parameters at ignition moment of HMX-based aluminized pressed explosives during slow cook-off

GUO Lu; ZHI Xiaoqi; QU Kepeng; LIU Xinghe; JIA Jie; LI Jin

doi:10.11883/bzycj-2023-0353

Volume 44 Issue 6

Jun. 2024

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CHEN Dong-liang, SUN Jin-hua, LIU Yi, MA Ye-feng, HAN Xue-bin. Propagation characteristics of premixed methane-air flames[J]. Explosion And Shock Waves, 2008, 28(5): 385-390. doi: 10.11883/1001-1455(2008)05-0385-06

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GUO Lu, ZHI Xiaoqi, QU Kepeng, LIU Xinghe, JIA Jie, LI Jin. Calculation of pressure parameters at ignition moment of HMX-based aluminized pressed explosives during slow cook-off[J]. Explosion And Shock Waves, 2024, 44(6): 062303. doi: 10.11883/bzycj-2023-0353

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Calculation of pressure parameters at ignition moment of HMX-based aluminized pressed explosives during slow cook-off

doi: 10.11883/bzycj-2023-0353

GUO Lu^1
,,
ZHI Xiaoqi^{1
,
,},
QU Kepeng²,
LIU Xinghe¹,
JIA Jie¹,
LI Jin¹

1.
School of Electromechanical Engineering, North University of China, Taiyuan 030051, Shanxi, China
2.
Xi’an Modern Chemistry Research Institute, Xi’an 710065, Shaanxi, China

Received Date: 2023-09-28
Rev Recd Date: 2024-03-26

Available Online: 2024-03-29

Publish Date: 2024-06-18

Abstract

Abstract

In order to study the pressure parameters of HMX-based aluminized pressed explosives at the ignition moment during slow cook-off, slow cook-off tests were designed at 0.1 and 1.0 ℃/min heating rates, and internal multi-point temperature measurements were taken inside explosives. On this foundation, based on the universal cook-off model of explosives, combining the multi-step decomposition reaction mechanism of HMX-based explosives with the reaction of aluminum powder, and considering the phase transition process in the decomposition of HMX-based explosives, a slow cook-off calculation model for pressure-department reaction rate of HMX-based aluminized pressed explosives is proposed. The calculation model is then written as a user defined function and imported into Ansys Fluent to perform calculations. Slow cook-off tests were conducted on large aspect ratio (5∶1) HMX-based aluminized pressed explosive charges with 4 mm shell thickness at heating rates of 0.1 and 1.0 ℃/min and compared with simulation results. And then the numerical simulations of the temperature field and internal pressure changes are performed before ignition of the cook-off bomb at heating rates of 0.055, 0.1, 0.2, 0.3, 0.5, and 1.0 ℃/min. It is found that at the heating rate of 0.1 ℃/min, after the test reaction, the end cover is ejected, the shell is axially cracked, and there is no powder left, so it is judged to be a deflagration reaction; while at the heating rate of 1.0 ℃/min, the shell is slightly deformed, with some powder left, indicating that a combustion reaction has occurred. The numerical calculations show that as the heat stimulus increases, the ignition temperature of the explosive tends to increase logarithmically, while the extent of reaction and internal pressure of the cook-off bomb tend to decrease exponentially. Before the HMX phase transition, the internal pressure inside the cook-off bomb grows slowly, after the HMX phase transition the pressure grow rapidly increases, and finally it rises sharply near the ignition moment.
- slow cook-off,
- HMX-based aluminized pressed explosives,
- universal cook-off model,
- heating rate,
- pressure,
- cook-off bomb

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References

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