Near-source characteristics of two-phase gas–solid outbursts in roadways
Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the form of the outburst, proximity to source, the structure and form of the transmitting roadways and the influence of obstacles. The following...
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| Published in | International journal of coal science & technology Vol. 8; no. 4; pp. 685 - 696 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
Singapore
Springer Singapore
01.08.2021
Springer Springer Nature B.V SpringerOpen |
| Subjects | |
| Online Access | Get full text |
| ISSN | 2095-8293 2198-7823 2198-7823 |
| DOI | 10.1007/s40789-020-00362-9 |
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| Abstract | Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the form of the outburst, proximity to source, the structure and form of the transmitting roadways and the influence of obstacles. The following characterizes the propagation of coal and gas outbursts as two-phase gas–solid flows proximal to source where the coupled effects of pulverized coal and gas flows dominate behavior. The characteristics of shock wave propagation and attenuation were systematically examined for varied roadway geometries using experiments and numerical models. The results demonstrate that the geometry of roadway obstructions is significant and may result in partial compression and sometimes secondary overpressurization in blocked and small corner roadways leading to significant attenuation of outburst shock waves. The shock waves attenuate slowly in both straight and abruptly expanding roadways and more significantly in T-shaped roadways. The most significant attenuation appears in small angle corners and bifurcations in roadways with the largest attenuation occurring in blocked roadways. These results provide basic parameters for simplifying transport in complex roadway networks in the far-field, and guidance for the design of coal and gas outburst prevention facilities and emergency rescue. |
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| AbstractList | Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the form of the outburst, proximity to source, the structure and form of the transmitting roadways and the influence of obstacles. The following characterizes the propagation of coal and gas outbursts as two-phase gas–solid flows proximal to source where the coupled effects of pulverized coal and gas flows dominate behavior. The characteristics of shock wave propagation and attenuation were systematically examined for varied roadway geometries using experiments and numerical models. The results demonstrate that the geometry of roadway obstructions is significant and may result in partial compression and sometimes secondary overpressurization in blocked and small corner roadways leading to significant attenuation of outburst shock waves. The shock waves attenuate slowly in both straight and abruptly expanding roadways and more significantly in T-shaped roadways. The most significant attenuation appears in small angle corners and bifurcations in roadways with the largest attenuation occurring in blocked roadways. These results provide basic parameters for simplifying transport in complex roadway networks in the far-field, and guidance for the design of coal and gas outburst prevention facilities and emergency rescue. Abstract Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the form of the outburst, proximity to source, the structure and form of the transmitting roadways and the influence of obstacles. The following characterizes the propagation of coal and gas outbursts as two-phase gas–solid flows proximal to source where the coupled effects of pulverized coal and gas flows dominate behavior. The characteristics of shock wave propagation and attenuation were systematically examined for varied roadway geometries using experiments and numerical models. The results demonstrate that the geometry of roadway obstructions is significant and may result in partial compression and sometimes secondary overpressurization in blocked and small corner roadways leading to significant attenuation of outburst shock waves. The shock waves attenuate slowly in both straight and abruptly expanding roadways and more significantly in T-shaped roadways. The most significant attenuation appears in small angle corners and bifurcations in roadways with the largest attenuation occurring in blocked roadways. These results provide basic parameters for simplifying transport in complex roadway networks in the far-field, and guidance for the design of coal and gas outburst prevention facilities and emergency rescue. |
| Audience | Academic |
| Author | Zhang, Meng Elsworth, Derek Wang, Kai Zhou, Aitao |
| Author_xml | – sequence: 1 givenname: Aitao surname: Zhou fullname: Zhou, Aitao organization: Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, Pennsylvania State University – sequence: 2 givenname: Meng surname: Zhang fullname: Zhang, Meng organization: School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing) – sequence: 3 givenname: Kai surname: Wang fullname: Wang, Kai email: safety226@126.com organization: Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing) – sequence: 4 givenname: Derek surname: Elsworth fullname: Elsworth, Derek organization: Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, Pennsylvania State University |
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| Cites_doi | 10.1007/s40789-015-0063-4 10.1007/BF00425934 10.3390/en11040797 10.1007/s40789-019-00284-1 10.1016/j.jlp.2016.07.011 10.1016/j.fuel.2017.05.001 10.1007/s40789-020-00317-0 10.1016/j.jlp.2015.03.003 10.1007/s00193-012-0362-2 10.1007/s00193-013-0435-x 10.1016/j.ssci.2011.08.024 10.1016/j.jngse.2016.06.033 10.1016/j.euromechflu.2016.05.002 10.1016/j.coal.2011.02.006 10.1007/s40789-018-0203-8 10.1016/j.coal.2018.05.012 10.1016/j.jlp.2017.02.014 10.1007/s00193-009-0237-3 |
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| Keywords | Two-phase gas–solid flow Coal and gas outburst Shock wave propagation Outburst prevention Proximity to source |
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| Snippet | Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the... Coal and gas outbursts compromise two-phase gas-solid mixtures as they propagate as shock waves and flows from their sources. Propagation is influenced by the... Abstract Coal and gas outbursts compromise two-phase gas–solid mixtures as they propagate as shock waves and flows from their sources. Propagation is... |
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| SubjectTerms | Analysis Coal Coal and gas outburst Energy Fossil Fuels (incl. Carbon Capture) Geotechnical Engineering & Applied Earth Sciences Mathematical models Mineral Resources Outburst prevention Propagation Proximity to source Research Article Roads & highways Shock wave propagation Shock waves Two-phase gas–solid flow Wave propagation |
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| Title | Near-source characteristics of two-phase gas–solid outbursts in roadways |
| URI | https://link.springer.com/article/10.1007/s40789-020-00362-9 https://www.proquest.com/docview/2569483246 https://link.springer.com/content/pdf/10.1007/s40789-020-00362-9.pdf https://doaj.org/article/fce4ee54594745e6899c1342d0b9d12a |
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