Effect of blocking ratio on aluminum powder explosion’s characteristicsin vertical duct

ZHU Xiaochao; ZHENG Ligang; YU Shuijun; WANG Yalei; LI Gang; DU Depeng; DOU Zengguo

doi:10.11883/bzycj-2019-0006

Volume 39 Issue 10

Oct. 2019

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Article Navigation > Explosion And Shock Waves > 2019 > 39(10): 105402

ZHU Xiaochao, ZHENG Ligang, YU Shuijun, WANG Yalei, LI Gang, DU Depeng, DOU Zengguo. Effect of blocking ratio on aluminum powder explosion’s characteristicsin vertical duct[J]. Explosion And Shock Waves, 2019, 39(10): 105402. doi: 10.11883/bzycj-2019-0006

Citation:

ZHU Xiaochao, ZHENG Ligang, YU Shuijun, WANG Yalei, LI Gang, DU Depeng, DOU Zengguo. Effect of blocking ratio on aluminum powder explosion’s characteristicsin vertical duct[J]. Explosion And Shock Waves, 2019, 39(10): 105402. doi: 10.11883/bzycj-2019-0006

Citation:

ZHU Xiaochao, ZHENG Ligang, YU Shuijun, WANG Yalei, LI Gang, DU Depeng, DOU Zengguo. Effect of blocking ratio on aluminum powder explosion’s characteristicsin vertical duct[J]. Explosion And Shock Waves, 2019, 39(10): 105402. doi: 10.11883/bzycj-2019-0006

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Effect of blocking ratio on aluminum powder explosion’s characteristicsin vertical duct

doi: 10.11883/bzycj-2019-0006

ZHU Xiaochao^1
,,
ZHENG Ligang^{1, 2
,
,},
YU Shuijun^{1, 2},
WANG Yalei¹,
LI Gang¹,
DU Depeng¹,
DOU Zengguo¹

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
The Collaborative Innovation Center of Coal Safety, Production of Henan Province, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received Date: 2019-01-08
Rev Recd Date: 2019-01-24

Available Online: 2019-09-25

Publish Date: 2019-10-01

Abstract

Abstract

In this work, experimenting on a self-built vertically transparent duct, we investigated the influence of the blocking ratio (φ) for duct-end venting on the explosive characteristics of aluminum dust explosion through analysis of its such characteristics as the flame front evolution and pressure history. The results show that the blocking ratio had a great influence on the flame front structure of aluminum powder of a small particle size. The overpressure in the pipeline exhibited a bimodal waveform and there was an inflection point of the blocking ratio φ=0.4 where the dominance of two overpressure peaks reversed. The first overpressure peak as a function of the blocking ratio was different from that of the second beyond the inflection point. The first overpressure peak increased as did the blocking ratio, and the increase rate rose greatly with φ=0.4 as the turning point. The second overpressure peak first rose and then fell with the increase of the blocking ratio, and reached the maximum at φ=0.4. Both peak values as a function of the blocking ratio for the large particle size were similar to that for the small particle size. However, the inflection point shifted to φ=0.6. The maximum (dominant) overpressure peak increased with the increase of the blocking ratio. A smaller particle size dust is prone to generating a more hazardous overpressure.
- blocking ratio,
- aluminum,
- explosion,
- duct,
- flame propagation,
- overpressure

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References

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