The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of Explosions
As the urban underground natural gas pipeline network expands, the explosion risk arising from methane accumulation in drainage ditches due to pipeline leakage has increased severely. A two-dimensional numerical model—9.7 m in length (including a 1-m obstacle section), 0.1 m in diameter, and with a...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
|
| Series: | Fire |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2571-6255/8/7/275 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849303536555261952 |
|---|---|
| author | Xingxing Liang Junjie Cheng Yibo Zhang Zhongqi Wang |
| author_facet | Xingxing Liang Junjie Cheng Yibo Zhang Zhongqi Wang |
| author_sort | Xingxing Liang |
| collection | DOAJ |
| description | As the urban underground natural gas pipeline network expands, the explosion risk arising from methane accumulation in drainage ditches due to pipeline leakage has increased severely. A two-dimensional numerical model—9.7 m in length (including a 1-m obstacle section), 0.1 m in diameter, and with a water volume fraction of 0.2—was developed to address the flexible boundary characteristics of urban underground ditches. The investigation examined the influence of methane concentration on explosion propagation characteristics. Results indicated that, at a methane concentration of 11%, the peak pressure attained 157.9 kPa, and the peak temperature exceeded 3100 K—all of which were significantly higher than the corresponding values at 10%, 13%, and 16% concentrations. Explosion-induced water motion exerted a cooling effect that inhibited heat and pressure transfer, while obstacles imposed partial restrictions on flame propagation. Temporal profiles of temperature and pressure exhibited three distinct stages: “initial stability–rapid rise–attenuation”. Notably, at a methane concentration of 16%, the water column formed by fluid vibration demonstrated a pronounced cooling effect, causing faster decreases in measured temperatures and pressures compared to other concentrations. |
| format | Article |
| id | doaj-art-bd1d99d3b7d84cef999c9ea83642cfe9 |
| institution | Kabale University |
| issn | 2571-6255 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fire |
| spelling | doaj-art-bd1d99d3b7d84cef999c9ea83642cfe92025-08-20T03:58:26ZengMDPI AGFire2571-62552025-07-018727510.3390/fire8070275The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of ExplosionsXingxing Liang0Junjie Cheng1Yibo Zhang2Zhongqi Wang3Faculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650500, ChinaState Key Laboratory of Explosion Science and Safety Protection, Beijing Institute of Technology, Beijing 100081, ChinaAs the urban underground natural gas pipeline network expands, the explosion risk arising from methane accumulation in drainage ditches due to pipeline leakage has increased severely. A two-dimensional numerical model—9.7 m in length (including a 1-m obstacle section), 0.1 m in diameter, and with a water volume fraction of 0.2—was developed to address the flexible boundary characteristics of urban underground ditches. The investigation examined the influence of methane concentration on explosion propagation characteristics. Results indicated that, at a methane concentration of 11%, the peak pressure attained 157.9 kPa, and the peak temperature exceeded 3100 K—all of which were significantly higher than the corresponding values at 10%, 13%, and 16% concentrations. Explosion-induced water motion exerted a cooling effect that inhibited heat and pressure transfer, while obstacles imposed partial restrictions on flame propagation. Temporal profiles of temperature and pressure exhibited three distinct stages: “initial stability–rapid rise–attenuation”. Notably, at a methane concentration of 16%, the water column formed by fluid vibration demonstrated a pronounced cooling effect, causing faster decreases in measured temperatures and pressures compared to other concentrations.https://www.mdpi.com/2571-6255/8/7/275methane explosionurban underground ditchnumerical simulationconfined space explosion dynamicsgas–liquid two-phase flow |
| spellingShingle | Xingxing Liang Junjie Cheng Yibo Zhang Zhongqi Wang The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of Explosions Fire methane explosion urban underground ditch numerical simulation confined space explosion dynamics gas–liquid two-phase flow |
| title | The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of Explosions |
| title_full | The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of Explosions |
| title_fullStr | The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of Explosions |
| title_full_unstemmed | The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of Explosions |
| title_short | The Influence of Different Concentrations of Methane in Ditches on the Propagation Characteristics of Explosions |
| title_sort | influence of different concentrations of methane in ditches on the propagation characteristics of explosions |
| topic | methane explosion urban underground ditch numerical simulation confined space explosion dynamics gas–liquid two-phase flow |
| url | https://www.mdpi.com/2571-6255/8/7/275 |
| work_keys_str_mv | AT xingxingliang theinfluenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions AT junjiecheng theinfluenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions AT yibozhang theinfluenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions AT zhongqiwang theinfluenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions AT xingxingliang influenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions AT junjiecheng influenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions AT yibozhang influenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions AT zhongqiwang influenceofdifferentconcentrationsofmethaneinditchesonthepropagationcharacteristicsofexplosions |