Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe

ZHU Wenyan; WANG Quan; ZHANG Jun; XU Xiaomeng; FANG Jingxian; LI Xuejiao

doi:10.11883/bzycj-2024-0024

Volume 44 Issue 7

Jul. 2024

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ZHU Wenyan, WANG Quan, ZHANG Jun, XU Xiaomeng, FANG Jingxian, LI Xuejiao. Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe[J]. Explosion And Shock Waves, 2024, 44(7): 075402. doi: 10.11883/bzycj-2024-0024

Citation:

ZHU Wenyan, WANG Quan, ZHANG Jun, XU Xiaomeng, FANG Jingxian, LI Xuejiao. Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe[J]. Explosion And Shock Waves, 2024, 44(7): 075402. doi: 10.11883/bzycj-2024-0024

Citation:

ZHU Wenyan, WANG Quan, ZHANG Jun, XU Xiaomeng, FANG Jingxian, LI Xuejiao. Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe[J]. Explosion And Shock Waves, 2024, 44(7): 075402. doi: 10.11883/bzycj-2024-0024

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Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe

doi: 10.11883/bzycj-2024-0024

ZHU Wenyan^1
,,
WANG Quan^{1, 2
,
,},
ZHANG Jun¹,
XU Xiaomeng¹,
FANG Jingxian¹,
LI Xuejiao^{1, 3}

1.
School of Chemical and Blasting Engineering, Anhui University of Science and Technology, Huainan 232001, Anhui, China
2.
Anhui Province Blasting Equipment and Technology Engineering Laboratory, Huainan 232001, Anhui, China
3.
School of Chemical and Blasting Engineering, Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining, Huainan 232001, Anhui, China

Received Date: 2024-01-10
Rev Recd Date: 2024-03-25

Available Online: 2024-03-29

Publish Date: 2024-07-05

Abstract

Abstract

To investigate the variation law of the blasting characteristics of the gas-powder two-phase mixed system, blast experiments with different outlet static action pressures (p_st) were carried out in a self-built stainless steel flame acceleration pipeline, and the variation law of p_st on two-phase blasting pressure, flame propagation velocity, and blasting flame morphology was emphatically studied. p_st is determined by the blasting hole blocking ratio (θ) and the number of blasting film layers (n). The increase of θ and n together increases p_st. The increase of p_st strengthens the constraint of gas powder and reaction products flowing out of the pipe, increases the viscosity effect of the fluid in the pipe, promotes the reaction of gas powder in the pipe, and reduces the degree of secondary explosion of unfired gas outside the pipe. For the pressure-time interval curve analysis, p_st increases from 2.97 kPa to 14.64 kPa, and the pressure time interval curve shows a double peak structure with a keep platform. The first pressure peak increases from 5.48 kPa to 10.20 kPa, the keep time extends from 6 ms to 25 ms, and the second pressure peak decreases from 23.03 kPa to 9.71 kPa. When p_st is 16.08 and 24.12 kPa, the pressure before the bursting film is superimposed and reflected many times, resulting in the time-history curve of bursting film pressure showing a special oscillating and rising three-peak structure. In the analysis of flame propagation velocity, the increase of p_st decreases the average flame propagation velocity from 161.33 m/s to 67.99 m/s. When n=2, the increase of θ makes the flame structure change from cluster to jet. When θ=88.9%, the blasting flame shows a typical jet shape. The increase of θ and n makes the flame brightness gradually decrease, the length of the flame luminescence zone decreases, the time interval from breaking film to flame emergence and the flame duration increase.
- explosion venting,
- gas-powder two-phase,
- static action pressure,
- deflagration pressure,
- flame pattern

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References(25)

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