Study on the protection of flexible facilities in urban underground space against hydrogen-blended methane explosion
The severe challenges of urban planning have made the utilization of urban space a significant trend in urban development. However, leakage from low hydrogen-doped natural gas pipeline networks can pose a significant explosion risk to urban underground spaces with many rigid and flexible facilities....
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25009001 |
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| Summary: | The severe challenges of urban planning have made the utilization of urban space a significant trend in urban development. However, leakage from low hydrogen-doped natural gas pipeline networks can pose a significant explosion risk to urban underground spaces with many rigid and flexible facilities. In order to effectively address the complexity of rigid/flexible facility layout and the uncertainty of explosion risk in urban underground space, as well as the explosion impact damage effect. This study uses a bottom-end ignition experiment in a semi-open pipe to simulate the explosion scenario in an urban underground space. By changing the flexible thickness and blockage rate, the protection technology of flexible facilities placed in front of rigid facilities against low hydrogen-doped methane explosion in urban underground space is investigated to reduce the explosion intensity. The research results show that when the blockage rate of the thinner flexible facilities is lower than that of the rigid facilities, the optimal protective effect can be achieved, effectively slowing down the flame speed and the peak of overpressure, and the explosion overpressure can be attenuated by 30.88 %; on the contrary, if the blockage rate of the flexible facilities exceeds that of the rigid facilities, it will aggravate the intensity of the explosion, and the explosion overpressure grows by 39.35 %. The existence of flexible facilities can not only disturb the flame vortex through its deformation, but also change the incident angle of pressure wave, so as to reduce the impact of pressure wave on rigid facilities. |
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| ISSN: | 2214-157X |