Experimental study on vented gas explosion in a cylindrical vessel with a vent duct |
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| Authors: | RM Kasmani GE Andrews HN Phylaktou |
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| Institution: | 1. Energy and Resources Research Institute, University of Leeds, LS2 9JT, UK;2. Faculty of Petroleum and Renewable Energy, Universiti Teknologi Malaysia, 81300 Johor, Malaysia;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. Department of Physics and Technology, University of Bergen, Allégaten 55, 5007 Bergen, Norway;2. GexCon AS, Fantoftveien 38, 5072 Bergen, Norway;3. GexCon UK, Suite 218 BE Business Centre Wembley, 1 Olympic Way, Wembley, HA9 0NP, United Kingdom;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;2. State Key Lab of Gas Geology and Control-Cultivation Base, Henan Polytechnic University, Jiaozuo, Henan 454003, China |
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| Abstract: | A study of vented explosions in a length over diameter (L/D) of 2 in cylindrical vessel connecting with a vent duct (L/D = 7) is reported. The influence of vent burst pressure and ignition locations on the maximum overpressure and flame speeds at constant vent coefficient, K of 16.4 were investigated to elucidate how these parameters affect the severity of a vented explosion. Propane and methane/air mixtures were studied with equivalence ratio, Φ ranges from 0.8 to 1.6. It is demonstrated that end ignition exhibited higher maximum overpressures and flame speeds in comparison to central ignition, contrary to what is reported in literature. There was a large acceleration of the flame toward the duct due to the development of cellular flames and end ignition demonstrated to have higher flame speeds prior to entry into the vent due to the larger flame distance. The higher vent flow velocities and subsequent flame speeds were responsible for the higher overpressures obtained. Rich mixtures for propane/air mixtures at Φ = 1.35 had the greatest flame acceleration and the highest overpressures. In addition, the results showed that Bartknecht's gas explosion venting correlation is grossly overestimated the overpressure for K = 16.4 and thus, misleading the impact of the vent burst pressure. |
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