Numerical Study of PBX 9501 Explosive Combustion Process in Confined Space
Abstract
:1. Introduction
2. Methodology
2.1. Combustion Rate Model
- Ignition stage of black powder. At this stage, the high-temperature gas produced by the combustion of black powder in the ignition chamber enters the crack, and the contact time between the surface of the explosive and the high-temperature combustion product produced by the combustion of black powder is short, so the combustion reaction of the explosive has not occurred.
- Phase of convection combustion and crack growth. The hot gas generated by the burning black powder propagates into the middle of the crack, initiating the combustion of a portion of the explosive near the ignition chamber. As the burning progresses, the explosive undergoes crack formation, allowing the high-temperature product gas to enter the crack, expanding the combustion surface area.
- The stage of rapid pressure rise. The continuous combustion of the upper and lower surface of the crack leads to increasing pressure inside the crack. When the pressure near the open end exceeds the pressure inside the ignition chamber, the product gas inside the crack flows into the ignition chamber through the open end. As the crack pressure continues to rise, the outlet’s flow velocity also increases.
- Restrain the shell breaking and pressure unloading stage. This stage is not within the research scope of this paper and will not be discussed in this paper.
2.2. Turbulence Model
2.3. Geometric Structure and Grid
2.4. Simulation Set-Ups
2.5. UDF Specification
3. Results and Discussion
3.1. Comparative Analysis of Temperature Field
3.2. Comparative Analysis of Pressure Field
- The simulated pressure rise curve is basically consistent with that from the literature, showing an exponential rising trend.
- In the literature, when the explosive is burned to 5.5 ms, the pressure at each node rises to about 250 MPa. In the simulation, when the combustion reaches 5.6 ms, the pressure at 100 mm, 148 mm and 196 mm rises to about 250 MPa, the pressure at 52 mm rises to about 200 MPa and the pressure at 4 mm rises to about 100 MPa.
- In the experiment, the sequence of rising edges at nodes is 52 mm, 100 mm, 148 mm and 196 mm. In the simulation, the ascending edges at each node are in the same order of 52 mm, 100 mm, 148 mm and 196 mm. In addition, the time of each node’s rising edge in the experiment and simulation is distributed between 4.2 ms and 4.8 ms.
- In the experiment, the explosive may have uneven filling pressure and it is impossible to achieve a complete seal, resulting in more fluctuations and bending of the experimental curve. The simulation is an ideal explosive combustion in a completely closed container, so the curve shows a relatively smooth rise.
- In the experiment, the explosive itself may have local cracks, resulting in a partial pressure surge in the low-pressure section. In the simulation, the explosive is a uniform entity, so the curve shows a smooth rise.
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
PBX | Plastic bonded explosive |
MWSD | Modified Wescott–Stewart–Davis model |
UDF | User-defined functions |
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Hu, Y.; Liu, J.; Wan, Q.; Zhang, M.; Li, M. Numerical Study of PBX 9501 Explosive Combustion Process in Confined Space. Processes 2023, 11, 2056. https://doi.org/10.3390/pr11072056
Hu Y, Liu J, Wan Q, Zhang M, Li M. Numerical Study of PBX 9501 Explosive Combustion Process in Confined Space. Processes. 2023; 11(7):2056. https://doi.org/10.3390/pr11072056
Chicago/Turabian StyleHu, Yupeng, Jiawen Liu, Qiang Wan, Meng Zhang, and Minghai Li. 2023. "Numerical Study of PBX 9501 Explosive Combustion Process in Confined Space" Processes 11, no. 7: 2056. https://doi.org/10.3390/pr11072056