The mechanism of flame propagation affected by flow/shock wave in a confined combustion chamber equipped with a perforated plate |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, PR China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;3. School of Materials Science & Engineering, Henan Polytechnic University, Jiaozuo 454000, PR China;4. School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, PR China;1. School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, People''s Republic of China;2. China-Australia Joint Laboratory for Energy & Environmental Materials, Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou, 510641, People''s Republic of China;3. Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering (IAPME), University of Macau, Macau SAR, China;1. Department of Mechanical Engineering, College of Engineering, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand;2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;3. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;1. Joint Institute for High Temperatures of Russian Academy of Science, 125412, Izhorskaya str., 13, build. 2, Moscow, Russia;2. Bauman Moscow State Technical University, 105005, 2nd Baumanskaya str., 5, Moscow, Russia |
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| Abstract: | The whole evolution of flame propagation in a confined combustion chamber was firstly experimentally observed in a newly designed experimental apparatus equipped with a perforated plate. The effect of the flame-flow/acoustic/shock wave interaction on the flame propagation was studied. The experiment was conducted with a stoichiometric hydrogen-air mixture. According to the flame morphology and the flame tip velocity, the whole evolution of flame propagation in the experimental apparatus was classified into the following three stages: laminar flame, jet flame and turbulent flame. In the present work, different flame propagation modes were obtained in different conditions. Depending on the initial pressure, three different flame propagation modes were observed. At an initial pressure of 1 bar, the flame propagation after perforated plate was mainly controlled by the interactions of the flame and combustion-generated flow ahead of the flame front. As initial pressures went up to 3 bar and 5 bar, shock waves were clearly observed ahead of the flame, which played a significant role on the flame propagation. The flame decelerated sharply and even propagated backwards, induced by the flame-shock wave interactions. Depending on the intensity of the shock wave, the backward-propagation velocity was higher at 5 bar with a stronger shock wave. In addition, the pressure oscillation at different initial pressures was discussed. |
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| Keywords: | Flame propagation Combustion Confined space Gas flow Shock wave |
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