Numerical studies on flame inclination in porous media combustors |
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| Authors: | Chenghang Zheng Leming Cheng Alexei Saveliev Zhongyang Luo Kefan Cen |
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| Affiliation: | 1. State Key Laboratory of Clean Energy Utilization (Zhejiang University), Hangzhou 310027, Zhejiang, China;2. Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA;1. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, China;3. School of Medical Technology, Xuzhou Medical College, Xuzhou 221004, China;1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;2. California State Polytechnic University, Los Angeles, CA 91768, USA;1. Marine Engineering College, Dalian Maritime University, Dalian 116026, China;2. Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China;3. School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China;1. The Institute of Problems of Chemical Physics of the Russian Academy of Sciences (IPCP RAS), Academician Semenov Avenue 1, Chernogolovka, Moscow Region 142432, Russian Federation;2. State Scientific Institution «A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus», P. Brovka Str. 15, 220072 Minsk, Belarus |
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| Abstract: | Inclinational instability developing during propagation of a filtration combustion wave in an inert porous medium is studied using two-dimensional numerical model. Stable and unstable combustion waves are generated by varying combustion parameters such as pressure, equivalence ratio, filtration velocity, effective conductivity of porous media, pellet diameter and combustor scale. The wave propagation velocity of inclinational flame is studied and compared with flat flame. The growth and reduction of inclinational instability are analyzed at different conditions. The numerical results show that a development of inclinational instability causes essential flow non-uniformity and can result in a separation of the flame front in the multiple flame zones. The limited conductive and radiant heat transfer in the solid phase, small pellet diameter of packed bed, high inlet velocity, large combustor scale and low equivalence ratio promote the instability growth. The inclinational instability is suppressed in a reciprocal combustor. |
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