Influences of negative pressure conditions on the explosion temperature field and harmful effects of emulsion explosive

LI Zihan; CHENG Yangfan; WANG Hao; ZHU Shoujun; SHEN Zhaowu

doi:10.11883/bzycj-2023-0106

Volume 43 Issue 8

Aug. 2023

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LI Zihan, CHENG Yangfan, WANG Hao, ZHU Shoujun, SHEN Zhaowu. Influences of negative pressure conditions on the explosion temperature field and harmful effects of emulsion explosive[J]. Explosion And Shock Waves, 2023, 43(8): 082301. doi: 10.11883/bzycj-2023-0106

Citation:

LI Zihan, CHENG Yangfan, WANG Hao, ZHU Shoujun, SHEN Zhaowu. Influences of negative pressure conditions on the explosion temperature field and harmful effects of emulsion explosive[J]. Explosion And Shock Waves, 2023, 43(8): 082301. doi: 10.11883/bzycj-2023-0106

Citation:

LI Zihan, CHENG Yangfan, WANG Hao, ZHU Shoujun, SHEN Zhaowu. Influences of negative pressure conditions on the explosion temperature field and harmful effects of emulsion explosive[J]. Explosion And Shock Waves, 2023, 43(8): 082301. doi: 10.11883/bzycj-2023-0106

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Influences of negative pressure conditions on the explosion temperature field and harmful effects of emulsion explosive

doi: 10.11883/bzycj-2023-0106

1.
School of Chemical Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China
2.
School of Engineering Science, University of Science and Technology of China, Hefei, 230027, Anhui, China

Received Date: 2023-03-27
Rev Recd Date: 2023-05-20

Available Online: 2023-05-25

Publish Date: 2023-08-31

Abstract

Abstract

In order to explore the mechanism of the detonation reaction of emulsion explosives under negative pressure conditions, a self-made visualized spherical explosion tank was designed, and the explosion flame propagation process, detonation wave pressure and explosion noise of emulsion explosive were measured by a high-speed camera, a pressure sensor and a noise meter, respectively. Furthermore, the two-dimensional temperature field of explosion fireball was reconstructed by using the colorimetric temperature measurement technology and the effects of the initial vacuum degree on the explosion temperature field, while the detonation wave characteristic parameters and the explosion noise of emulsion explosives were studied in depth. Combined with the simulation results of the AUTODYN software, the influences of negative pressures on the explosive pressure fields were analyzed, and the detonation mechanism of the emulsion explosive in the negative pressure environment was also discussed. The experimental results show that with the increase of the initial vacuum degree, the explosion fireball became brighter, lasted longer and had a more stable morphology; when the vacuum degree was 0 kPa, the fireball began to rupture at 19.35 μs, while the vacuum degree was 100 kPa, the fireball began to rupture at 58.05 μs; a low initial vacuum degree had little effect on the fireball temperature, while the initial vacuum degree above 60 kPa would significantly increase the explosion temperature of emulsion explosives. The peak pressure and specific impulse of shock wave decreased with the increase of initial vacuum degree, while the effect of initial vacuum degree on the positive pressure action time of shock wave was not obvious. AUTODYN numerical simulation results show that the peak pressure of the shock wave decreases with the increase of the vacuum degree, the shock wave velocity gradually decreases, being closer to the expansion velocity of the detonation product. In addition, the increase of the initial vacuum degree was beneficial for the reduction of the explosion noise, compared with atmospheric pressure, when the vacuum degree in the tank was 100 kPa, the sound pressure level of explosion noise was reduced by 35.9 dB, with a reduction of 29.8%.
- vacuum explosion,
- emulsion explosive,
- colorimetric pyrometer,
- shock wave parameters,
- explosion noise

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References(22)

References

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