Simulation study on propagation characteristics of gas explosion in Y-shaped ventilated coal face

LIU Jiajia; ZHANG Yang; ZHANG Xiang; NIE Zishuo

doi:10.11883/bzycj-2023-0018

Volume 43 Issue 8

Aug. 2023

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Article Navigation > Explosion And Shock Waves > 2023 > 43(8): 085401

LIU Jiajia, ZHANG Yang, ZHANG Xiang, NIE Zishuo. Simulation study on propagation characteristics of gas explosion in Y-shaped ventilated coal face[J]. Explosion And Shock Waves, 2023, 43(8): 085401. doi: 10.11883/bzycj-2023-0018

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LIU Jiajia, ZHANG Yang, ZHANG Xiang, NIE Zishuo. Simulation study on propagation characteristics of gas explosion in Y-shaped ventilated coal face[J]. Explosion And Shock Waves, 2023, 43(8): 085401. doi: 10.11883/bzycj-2023-0018

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Simulation study on propagation characteristics of gas explosion in Y-shaped ventilated coal face

doi: 10.11883/bzycj-2023-0018

LIU Jiajia^{1, 2, 3, 4
,},
ZHANG Yang¹,
ZHANG Xiang¹,
NIE Zishuo¹

1.
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, Anhui, China
3.
State Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, Henan, China
4.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China

Received Date: 2023-01-16
Rev Recd Date: 2023-04-06

Available Online: 2023-04-25

Publish Date: 2023-08-31

Abstract

Abstract

To study the propagation law of gas explosion in a Y-shaped ventilated coal face, the simulation software of Fluent was used to carry out numerical simulation research combined with the actual situation of the N2105 working face in the Yuwu Coal Mine. Firstly, the reliability of the mathematical model in this paper was demonstrated. In addition, the simulation parameters were optimized to make the results fit the actual situation. Finally, a numerical simulation was carried out. The results show that the maximum error between the simulation results and the previous experimental results is 11.3%, and the minimum error is only 1.7%, which verifies the reliability of the mathematical model in this paper. The most reasonable key parameters for the numerical simulation of gas explosion were determined including mesh size, iteration step size and ignition temperature, which are 0.4 m, 0.10 ms and 1 800 K, respectively. The overpressure peak of the gas explosion in the air inlet channel, belt fluting, return airway, and working face and its distance from the explosion source accords with an exponential function, and the relationship between the time required to reach the overpressure peak and the distance from the explosion source is linear. The overpressure attenuation ratio of the working face is 41.03% at 7.5 m away from the tunnel bifurcation, and the overpressure attenuation ratio of the belt fluting is 25.99%. Belt fluting is more dangerous in the event of a gas explosion. In the bifurcation of the working face, the turbulent flow zone gradually moves from the right side to the left side, and the overpressure peak at the bifurcation of the roadway increases. The flame dissipation of the return airway is the fastest, followed by the flame dissipation of the belt fluting, and the flame dissipation of the working face is the slowest. The direction of the flame dissipation in the belt fluting and return airway is opposite to the direction of the flame propagation in the early stage of the gas explosion, while the direction of the flame dissipation in the working face is consistent with the direction of the flame propagation in the early stage of the gas explosion.
- Y-shaped ventilation,
- coal face,
- gas explosion,
- overpressure peak,
- flame propagation

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References

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