Effect of the vent burst pressure on explosion venting of rich methane-air mixtures in a cylindrical vessel |
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| Institution: | 1. College of Environment and Resources, Fuzhou University, Fuzhou 350116, PR China;2. School of Civil Engineering, Hefei University of Technology, Hefei 230009, PR China;3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, PR China;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China;2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, PR China;1. Centre for Infrastructural Monitoring and Protection, School of Civil and Mechanical Engineering, Curtin University, Kent St, Bentley WA 6102, Australia;2. Department of Civil Engineering, University of Chile, Blanco Encalada 2002, Santiago, Chile;3. State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, PLA University of Science and Technology, Nanjing, Jiangsu 210007, China;1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui, 232001, China;2. College of Environment and Resources, Fuzhou University, Fuzhou, 350116, PR China;3. Anhui Electric Power Research Institute, Hefei, 230601, PR China;1. School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, PR China;2. School of Civil Engineering, Hefei University of Technology, Hefei 230009, PR China |
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| Abstract: | The effect of the vent burst pressure on explosion venting of a rich methane-air mixture was experimentally investigated in a small cylindrical vessel. The experimental results show that Helmholtz oscillation of the internal flame bubble of the methane-air mixture can occur in a vessel with a vent area much smaller than that reported by previous researchers, and the period of Helmholtz oscillation decreases slightly when the vent burst pressure increases. The maximum overpressure in the vessel increases approximately linearly with the increase in the vent burst pressure; however, the pressure peaks induced by Helmholtz oscillation always remain approximately several kilopascals. The external flame reaches its maximum length in a few milliseconds after vent failure and then oscillates in accordance with the pressure oscillation in the vessel. The maximum length of the external flame increases, but its duration time decreases with the increase in the vent burst pressure. |
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| Keywords: | Explosion venting Methane Vent burst pressure Flame propagation Helmholtz oscillation |
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