An overpressure-time history model of methane-air explosion in tunnel-shape space

Chen, D; Wu, C; Li, J; Liao, K

An overpressure-time history model of methane-air explosion in tunnel-shape space

Chen, D Wu, C

Li, J

Liao, K

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Loss Prevention in the Process Industries, 2023, 82, pp. 105004
Issue Date:: 2023-04-01

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Field	Value	Language
dc.contributor.author	Chen, D
dc.contributor.author	Wu, C https://orcid.org/0000-0001-6786-7934
dc.contributor.author	Li, J https://orcid.org/0000-0003-2457-1994
dc.contributor.author	Liao, K
dc.date.accessioned	2023-03-26T21:19:23Z
dc.date.available	2023-03-26T21:19:23Z
dc.date.issued	2023-04-01
dc.identifier.citation	Journal of Loss Prevention in the Process Industries, 2023, 82, pp. 105004
dc.identifier.issn	0950-4230
dc.identifier.uri	http://hdl.handle.net/10453/168411
dc.description.abstract	This study investigated methane-air explosion in tunnel-shape space and developed an overpressure-time history model based on numerical results. The findings revealed that for the progressively vented gas explosion with movable steel obstacles in a 20 m long tunnel, the inner peak overpressure increased as the activation pressure of the tunnel top cover got higher but remained below 6 bar. However, as the activation pressure increased to 8 bar or higher, the peak inner overpressure remained unchanged. As the segment cover panel became wider, the peak pressure was almost unchanged, but the pressure duration and impulse declined significantly. The peak pressure and impulse increased as the tunnel length vary from 10 to 30 m. With fixed tunnel length, higher blast pressure but lower impulse was observed as the inner obstacles were closer or the activation pressure of obstacles was higher. It is also found that a local enlarged space in the tunnel enhanced the peak pressure significantly. An overpressure time history model for the tunnel with fixed top cover and enlarged end zone was established. The model considered activation pressure of vent cover, area and length of vent opening, methane concentration, number and blockage ratio of fixed obstacles was developed to calculate the overpressure and corresponding time at characteristic points of the pressure-history curve. The cubic Hermite interpolation algorithm and a specially tuned formula consisting of the power and exponential function were used to interpolate pressure values between characteristic points. The proposed model can predict both the peak pressure and the overpressure time history with acceptable accuracy.
dc.language	en
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/DP210101100
dc.relation.ispartof	Journal of Loss Prevention in the Process Industries
dc.relation.isbasedon	10.1016/j.jlp.2023.105004
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0904 Chemical Engineering, 0911 Maritime Engineering
dc.subject.classification	Strategic, Defence & Security Studies
dc.title	An overpressure-time history model of methane-air explosion in tunnel-shape space
dc.type	Journal Article
utslib.citation.volume	82
utslib.for	0904 Chemical Engineering
utslib.for	0911 Maritime Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	in_progress	*
dc.date.updated	2023-03-26T21:19:21Z
pubs.publication-status	Accepted
pubs.volume	82

Abstract:

This study investigated methane-air explosion in tunnel-shape space and developed an overpressure-time history model based on numerical results. The findings revealed that for the progressively vented gas explosion with movable steel obstacles in a 20 m long tunnel, the inner peak overpressure increased as the activation pressure of the tunnel top cover got higher but remained below 6 bar. However, as the activation pressure increased to 8 bar or higher, the peak inner overpressure remained unchanged. As the segment cover panel became wider, the peak pressure was almost unchanged, but the pressure duration and impulse declined significantly. The peak pressure and impulse increased as the tunnel length vary from 10 to 30 m. With fixed tunnel length, higher blast pressure but lower impulse was observed as the inner obstacles were closer or the activation pressure of obstacles was higher. It is also found that a local enlarged space in the tunnel enhanced the peak pressure significantly. An overpressure time history model for the tunnel with fixed top cover and enlarged end zone was established. The model considered activation pressure of vent cover, area and length of vent opening, methane concentration, number and blockage ratio of fixed obstacles was developed to calculate the overpressure and corresponding time at characteristic points of the pressure-history curve. The cubic Hermite interpolation algorithm and a specially tuned formula consisting of the power and exponential function were used to interpolate pressure values between characteristic points. The proposed model can predict both the peak pressure and the overpressure time history with acceptable accuracy.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/168411