Scale and material effects on flame characteristics in small heat recirculation combustors of a counter-current channel type |
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| Authors: | Min Jung Lee Sang Moon Cho Byung Il Choi Nam Il Kim |
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| Affiliation: | 1. School of Mechanical Engineering, Chung-Ang University, Heukseok-dong, Dongjak-gu, Seoul 156-756, Republic of Korea;2. Korea Institute of Machinery and Materials, Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea;1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;2. School of Power Engineering, Chongqing University, Chongqing 400044, China;3. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China;3. Institute of New Energy and Energy-Saving & Emission-Reduction Technology, Hunan University, Changsha 410082, China;1. Department of Mechanical Engineering, University of Canterbury, Private Bag 4800, Christchurch, 8041, New Zealand;2. School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China;3. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China;1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;2. Guangzhou Institute of Energy Conversion, CAS, Guangzhou 510640, China;1. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China;2. Institute of Fluid Science, Tohoku University, Sendai 980-8577, Japan |
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| Abstract: | Small energy sources have been interested with the recent development of small-scale mechanical systems. With the purpose of developing a basic model of micro-combustors of heat recirculation, small combustors of a counter-current channel type were fabricated, and the premixed flame stabilization characteristics were investigated experimentally. Each combustor consists of a combustion space and a pair of counter-current channels for heat recirculation. The channel gap was less than the ordinary quenching distance of a stoichiometric methane-air premixed flame. Depending on the flame locations and structures, flame stabilization was classified into four modes: an ordinary mode, a channel mode, a radiation mode, and a well-stirred reaction mode. Base-scale combustors of stainless steel were initially examined. Additional half-scale combustors of stainless steel and quartz were fabricated and their flame stabilization conditions were compared. Consequently, a change of the material of the combustor significantly affected the flame stabilization compared to the effects of a scale-down design. A half-scale quartz combustor had a wide range of flame stabilization conditions. Surface temperatures and the composition of the emission gas were measured. At a higher flow rate, the combustor temperature increases and the light emission from the middle wall is enhanced to extend the flame stabilization conditions. The combustion efficiency and the composition of emitted gas were feasible. These results provide useful information for the design of small-scale combustors. |
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