The quenching of propane deflagrations by crimped ribbon flame arrestors |
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Institution: | 1. CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD), 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 Civil Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China;2. Anhui International Joint Research Center on Hydrogen Safety, Hefei 230009, PR China;1. CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD), 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;3. Nanjing Engn Inst Aircraft Syst, Aviat Key Lab Sci & Technol Aero Electromech Syst, Nanjing 211106, Jiangsu, PR China |
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Abstract: | Experimental studies of deflagration flame quenching by crimped ribbon flame arrestors were performed in a circular ducting with propane-air flammable mixture. The corresponding flameproof velocities were determined systemically. The results showed that the channel length, the expansion ratio and the aperture size must be taken into consideration to predict the performance of the crimped ribbon flame arrestors. To explore the relationship between flameproof velocity and arrestor structure, numerical simulations were carried out. The simulated results showed that with the reduction of the hydraulic diameter of the aperture size, the flameproof velocity is increased, which implies the basic angle must be considered when crimped ribbon flame arrestors are used to quench deflagration flame. In addition, the influence of the expansion ratio is of great significance on the efficiency of flame arrestors. The flameproof velocity can be reduced to be a value related to the expansion ratio. Two empirical formulas were derived to exhibit the relation between the flameproof velocity and the characteristics of the flame arrestor, which can be used to predict the performance of crimped ribbon arrestors. |
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Keywords: | Crimped ribbon flame arrestor Flame quenching Flameproof velocity Expansion ratio |
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