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

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

doi:10.11883/bzycj-2023-0353

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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 under slow cook-off[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0353

Citation:

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 under slow cook-off[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0353

Citation:

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 under slow cook-off[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0353

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Calculation of pressure parameters at ignition moment of HMX-based aluminized pressed explosives under 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

Abstract

Abstract

In order to study the pressure parameters of HMX-based aluminized pressed explosives at the ignition moment of slow cook-off, slow cook-off test were designed at 0.1 and 1℃/min heating rates, and an 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 was established. This study wrote the calculation model as a user defined function and imported it 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℃/min and 1℃/min and compared with simulation results. And then, the numerical simulations of the temperature field and internal pressure changes were performed before ignition of the cook-off bomb at heating rates of 0.055, 0.1, 0.2, 0.3, 0.5, and 1℃/min. It was found that at the heating rate of 0.1℃/min, after the test reaction, the end cover was ejected, the shell was axially cracked, and there was no powder left, which was judged to be a deflagration reaction; at the heating rate of 1℃/min, the shell was slightly deformed, with some powder left, and it was judged that a combustion reaction had 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 rapidly increasing, 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(23)

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