The law of gas explosion and gas-liquid coupling in urban underground drainage pipelines

ZHOU Gang; KONG Yang; CUI Yangyang; QIAN Xinming; FU Liye; ZHANG Qi

doi:10.11883/bzycj-2023-0123

Volume 44 Issue 3

Mar. 2024

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Article Navigation > Explosion And Shock Waves > 2024 > 44(3): 032101

ZHOU Gang, KONG Yang, CUI Yangyang, QIAN Xinming, FU Liye, ZHANG Qi. The law of gas explosion and gas-liquid coupling in urban underground drainage pipelines[J]. Explosion And Shock Waves, 2024, 44(3): 032101. doi: 10.11883/bzycj-2023-0123

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ZHOU Gang, KONG Yang, CUI Yangyang, QIAN Xinming, FU Liye, ZHANG Qi. The law of gas explosion and gas-liquid coupling in urban underground drainage pipelines[J]. Explosion And Shock Waves, 2024, 44(3): 032101. doi: 10.11883/bzycj-2023-0123

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The law of gas explosion and gas-liquid coupling in urban underground drainage pipelines

doi: 10.11883/bzycj-2023-0123

ZHOU Gang^{1, 2
,},
KONG Yang^{1, 2},
CUI Yangyang³,
QIAN Xinming⁴,
FU Liye⁴,
ZHANG Qi^{1, 2, 4
,
,}

1.
College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
2.
State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
3.
China Center for Safety Research, Ministry of Emergency Management of the People’s Republic of China and China Coal Strategic Research Center, Beijing 100713, China
4.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China

Received Date: 2023-04-07
Rev Recd Date: 2023-09-05

Available Online: 2023-11-15

Publish Date: 2024-03-14

Abstract

Abstract

There are frequent gas explosion accidents in urban rain and sewage drainage pipes, which pose a serious threat to people’s lives and property safety. To study the propagation characteristics of gas explosion and the law of gas-liquid two-phase coupling in urban underground drainage pipes, based on the gas-liquid two-phase flow theory and computational fluid dynamics method, a numerical simulation study of the explosion-acceleration-decay process of gas/air mixture under different water depth ratio was conducted. The results show that when the water depth ratio is less than 0.7, as the water depth ratio increases, the long-diameter ratio of the gas phase space increases, the fuel combustion intensifies, and the flame acceleration phenomenon gradually becomes significant, which leads to a gradual increase in peak overpressure, a gradual reduction in peak overpressure time, and a more significant effect of peak overpressure along the axial direction. When the water depth ratio reaches 0.7, the propagation of the flame in the pipeline is blocked, and the fluctuation caused by the water shock and the fine water column quickly occupy a small gas phase space, blocking the continuous propagation of the flame, which makes the explosion overpressure appear only near the ignition source. Under different water depth ratios, in the same zone of the pipeline and at the same moment, the height of the water being rolled up and the velocity field of the gas phase region is different, and the cryogenic liquid is rolled up to cool and block the high-temperature flame in the adjacent zone. Then, due to the macroscopic flow of the gas, the cryogenic gas adjacent to the liquid surface flows to the high-temperature region in the pipeline, resulting in a decrease in the flame temperature in the pipeline. The shock of water and the flying of fine water columns greatly reduce the risk of explosion overpressure. The research results provide a scientific basis for the explosion protection of urban gas lifelines.
- urban drainage pipeline,
- natural gas explosion,
- explosion overpressure,
- flame extinction

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