Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open Tube
To understand the propagation characteristics of methane-air deflagration flames and in an obstacle-filled tube, a high-speed color video camera, photoelectric sensors, and pressure transducers were used to test the deflagration flame propagating parameters. The tests were run in a 1500 mm long plex...
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MDPI AG
2017-11-01
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Online Access: | https://www.mdpi.com/1996-1073/10/11/1908 |
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author | Quan Wang Shanghao Liu Chi-min Shu Yibin Ding Zhimin Li |
author_facet | Quan Wang Shanghao Liu Chi-min Shu Yibin Ding Zhimin Li |
author_sort | Quan Wang |
collection | DOAJ |
description | To understand the propagation characteristics of methane-air deflagration flames and in an obstacle-filled tube, a high-speed color video camera, photoelectric sensors, and pressure transducers were used to test the deflagration flame propagating parameters. The tests were run in a 1500 mm long plexiglass tube with a 100 × 100 mm square cross-section. The obstacles included four types of repeated baffles and five forms of solid structure obstacles. The results showed that: (1) the flame front was constantly distorted, stretched, and deformed by different types of obstacles and, consequently, the flame propagating parameters increased; (2) plates and triple prisms increased the speed of the flame and overpressure to the highest extent, whereas cuboids and quadrangulars exerted an intermediate effect. However, the effect of cylindrical obstacles was comparatively limited. It was suggested that the obstacle’s surface edge mutation or curvature changes were the main factors stimulating the flame acceleration; (3) the peak pressure of deflagration was relatively low near the ignition end, increased gradually until it reached the maximum at the middle of the tube, and decreased rapidly near the open end; and (4) the fixed obstacles in front of the flame exhibited a blocking effect on flame propagation during the initial stages; the flame speed and overpressure increased when the flame came into contact with the obstacles. This study is of significance because it explains the methane-air propagation mechanism induced by different types of obstacles. The findings have value for preventing or controlling gas explosion disasters. |
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institution | Directory Open Access Journal |
issn | 1996-1073 |
language | English |
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series | Energies |
spelling | doaj.art-ef6ab421e1dc4539816286df3d086ab62022-12-22T02:58:05ZengMDPI AGEnergies1996-10732017-11-011011190810.3390/en10111908en10111908Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open TubeQuan Wang0Shanghao Liu1Chi-min Shu2Yibin Ding3Zhimin Li4School of Chemical Engineering, Anhui University of Science & Technology, Huainan 232001, ChinaSchool of Chemical Engineering, Anhui University of Science & Technology, Huainan 232001, ChinaProcess Safety and Disaster Prevention Laboratory, National Yunlin University of Science and Technology, Douliu, Yunlin 64002, TaiwanSafety Engineering Technology Institute, Anhui Province Academy of Science and Technology, Hefei 230061, ChinaSchool of Chemical Engineering, Anhui University of Science & Technology, Huainan 232001, ChinaTo understand the propagation characteristics of methane-air deflagration flames and in an obstacle-filled tube, a high-speed color video camera, photoelectric sensors, and pressure transducers were used to test the deflagration flame propagating parameters. The tests were run in a 1500 mm long plexiglass tube with a 100 × 100 mm square cross-section. The obstacles included four types of repeated baffles and five forms of solid structure obstacles. The results showed that: (1) the flame front was constantly distorted, stretched, and deformed by different types of obstacles and, consequently, the flame propagating parameters increased; (2) plates and triple prisms increased the speed of the flame and overpressure to the highest extent, whereas cuboids and quadrangulars exerted an intermediate effect. However, the effect of cylindrical obstacles was comparatively limited. It was suggested that the obstacle’s surface edge mutation or curvature changes were the main factors stimulating the flame acceleration; (3) the peak pressure of deflagration was relatively low near the ignition end, increased gradually until it reached the maximum at the middle of the tube, and decreased rapidly near the open end; and (4) the fixed obstacles in front of the flame exhibited a blocking effect on flame propagation during the initial stages; the flame speed and overpressure increased when the flame came into contact with the obstacles. This study is of significance because it explains the methane-air propagation mechanism induced by different types of obstacles. The findings have value for preventing or controlling gas explosion disasters.https://www.mdpi.com/1996-1073/10/11/1908high-speed color video cameradeflagration flame propagation parametersrepeated bafflesgas explosionsolid structure obstacles |
spellingShingle | Quan Wang Shanghao Liu Chi-min Shu Yibin Ding Zhimin Li Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open Tube Energies high-speed color video camera deflagration flame propagation parameters repeated baffles gas explosion solid structure obstacles |
title | Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open Tube |
title_full | Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open Tube |
title_fullStr | Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open Tube |
title_full_unstemmed | Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open Tube |
title_short | Influence of Different Types of Obstacles on the Propagation of Premixed Methane-Air Flames in a Half-Open Tube |
title_sort | influence of different types of obstacles on the propagation of premixed methane air flames in a half open tube |
topic | high-speed color video camera deflagration flame propagation parameters repeated baffles gas explosion solid structure obstacles |
url | https://www.mdpi.com/1996-1073/10/11/1908 |
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