Effects of vent layout and vent area on dynamic characteristics of premixed methane-air explosion in a tube with two side-vented ducts |
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| Institution: | 1. Institute of Safety Science & Engineering, South China University of Technology, Guangzhou, 510640, China;2. Guangdong Provincial Science and Technology Collaborative Innovation Center for Work Safety, Guangzhou, 510640, China;3. Joint Laboratory of Nuclear Power Plant Fire Safety, Guangzhou Institute of Industry Technology, Guangzhou, 511458, China;1. Université de Toulouse, INSA, UPS, Mines d’Albi, ISAE, ICA (Institut Clément Ader), 135 Avenue de Rangueil, Cedex, 31077, Toulouse, France;2. Defence Technology Institute, 47/433 Moo 3, Ban Mai, Pak Kret, Nonthaburi, 11120, Thailand;3. Faculty of Engineering, Burapha University, 169 Long-Hard Bangsaen Road, Chonburi, 20131, Thailand;1. CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD), Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230026, Anhui, PR China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230026, Anhui, PR China;1. School of Chemical Engineering, Anhui University of Science and Technology (AUST), 168, Taifeng St., Anhui, 232001, China;2. Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology (YunTech), 123, University Rd. Sec. 3, Douliou, 64002, Yunlin, Taiwan;3. Department of Occupational Safety and Health, Jen-Teh Junior College of Medicine, Nursing and Management, 1, Jen-Teh Rd., Houlong, Miaoli, 35665, Taiwan, ROC;1. School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, PR China;2. School of Emergency Management and Safety Engineering, Yancheng Institute of Technology, Yancheng, 224051, PR China;3. School of Safety Science and Engineering, Changzhou University, Changzhou, 213164, PR China;4. College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao, Shandong, 266580, PR China |
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| Abstract: | To further elucidate the influence mechanism of side vents on the dynamic characteristics of gas explosions in tubes is helpful to design more reasonable vent layouts. In this paper, 9.5% methane-air explosion experiments were conducted in a tube with two side-vented ducts, and the effects of vent layouts and vent areas on the dynamic characteristics of explosion overpressure and flame propagation speed were investigated. The results demonstrate that under the same condition with a single vent area of 100 mm × 100 mm, when only the end vent is open, the maximum explosion overpressure and the maximum flame propagation speed are the highest among the five vent layouts. When the side vents 1 and 2 and the end vent are open, the maximum explosion overpressure is the lowest, and an unusual discovery is that the flame front changes into a hemispherical shape, finger shape, quasi-plane shape, tulip shape and wrinkled structure. When only side vent 1 is open, a unique Helmholtz oscillation occurs, and a new discovery is that there is a consistent oscillation relationship among the overpressure, flame propagation speed and flame structure. Helmholtz oscillation occurs only when a single vent area is 100 mm × 100 mm–60 mm × 60 mm, and the oscillation degree decreases with decreasing vent area. During the vent failure stage, the maximum explosion overpressure is generated, the flame front begins to appear irregular shape, and the flame propagation speed shows a prominent characteristic peak. After the vent failure stage, the driving effect of the end vent on the flame is higher than that of the side vent on the flame. Furthermore, the correlation equations of the mathematical relationships among the maximum explosion overpressure Pred, the static activation pressure Pstat and the vent coefficient Kv under four vent layouts are established, respectively. |
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| Keywords: | Side-vented ducts Methane-air explosion overpressure Flame propagation speed Vent layout Vent area Helmholtz oscillation |
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