Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures
© 2016 Elsevier B.V. All rights reserved. 29 batches of vented explosion tests were conducted in a 12 m 3 concrete chamber filled with methane-air mixtures to investigate the effects of methane concentration and venting pressure on the development of overpressure inside the chamber. The deflagratio...
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| Format: | Journal Article |
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Elsevier Ltd
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/55578 |
| _version_ | 1848759656528216064 |
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| author | Bao, Q. Fang, Q. Zhang, Y. Chen, L. Yang, S. Li, Zhan |
| author_facet | Bao, Q. Fang, Q. Zhang, Y. Chen, L. Yang, S. Li, Zhan |
| author_sort | Bao, Q. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2016 Elsevier B.V. All rights reserved. 29 batches of vented explosion tests were conducted in a 12 m 3 concrete chamber filled with methane-air mixtures to investigate the effects of methane concentration and venting pressure on the development of overpressure inside the chamber. The deflagrations were vented from a square side window with a venting area of 0.64 m 2 upon rupture of the vent cover. The venting pressures were varied by using six different types of vent covers, and determined by performing a numerical simulation. Methane concentrations in the mixed gas varied between 6.5 and 13.5 vol.%, covering both lean and rich combustion regimes. The generation conditions of the four types of overpressure-time profiles with different overpressure transients were summarized. Among the overpressure transients, the ?P 1 caused by failure of the vent cover and the ?P 4 resulted from the coupling between acoustic mode and flame were basically dominant. The rate of ?P 1 rise as well as peak value of ?P 1 and ?P 4 showed a same trend of first increasing and then decreasing with the methane concentration from lean to rich. They reached their maximum value at the methane concentration of about 9.5%, whereas the rate of ?P 4 rise was found to be insensitive to the methane concentration. The peak value of ?P 1 increased with the venting pressure, while that of ?P 4 first increased and then decreased as the venting pressure increased. In addition, the rates of ?P 1 and ?P 4 rise were both insensitive to the venting pressure. The occurrence of ?P 4 was depended on the methane concentration and the venting pressure. The differences in the behavior of these overpressure transients suggest their different generation mechanisms. |
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| format | Journal Article |
| id | curtin-20.500.11937-55578 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:03:21Z |
| publishDate | 2016 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-555782017-09-13T16:10:52Z Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures Bao, Q. Fang, Q. Zhang, Y. Chen, L. Yang, S. Li, Zhan © 2016 Elsevier B.V. All rights reserved. 29 batches of vented explosion tests were conducted in a 12 m 3 concrete chamber filled with methane-air mixtures to investigate the effects of methane concentration and venting pressure on the development of overpressure inside the chamber. The deflagrations were vented from a square side window with a venting area of 0.64 m 2 upon rupture of the vent cover. The venting pressures were varied by using six different types of vent covers, and determined by performing a numerical simulation. Methane concentrations in the mixed gas varied between 6.5 and 13.5 vol.%, covering both lean and rich combustion regimes. The generation conditions of the four types of overpressure-time profiles with different overpressure transients were summarized. Among the overpressure transients, the ?P 1 caused by failure of the vent cover and the ?P 4 resulted from the coupling between acoustic mode and flame were basically dominant. The rate of ?P 1 rise as well as peak value of ?P 1 and ?P 4 showed a same trend of first increasing and then decreasing with the methane concentration from lean to rich. They reached their maximum value at the methane concentration of about 9.5%, whereas the rate of ?P 4 rise was found to be insensitive to the methane concentration. The peak value of ?P 1 increased with the venting pressure, while that of ?P 4 first increased and then decreased as the venting pressure increased. In addition, the rates of ?P 1 and ?P 4 rise were both insensitive to the venting pressure. The occurrence of ?P 4 was depended on the methane concentration and the venting pressure. The differences in the behavior of these overpressure transients suggest their different generation mechanisms. 2016 Journal Article http://hdl.handle.net/20.500.11937/55578 10.1016/j.fuel.2016.01.084 Elsevier Ltd restricted |
| spellingShingle | Bao, Q. Fang, Q. Zhang, Y. Chen, L. Yang, S. Li, Zhan Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures |
| title | Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures |
| title_full | Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures |
| title_fullStr | Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures |
| title_full_unstemmed | Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures |
| title_short | Effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures |
| title_sort | effects of gas concentration and venting pressure on overpressure transients during vented explosion of methane-air mixtures |
| url | http://hdl.handle.net/20.500.11937/55578 |