지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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The Numerical simulation was performed on the flow field around the two-dimensional rectangular bluff body in order to complement the previous experimental results of the bluff body stabilized flames [1]. For both fuel ejection configurations against an oxidizer stream, the flame stability was affected mainly by vortex structure and mixing field near bluff body. FDS(Fire Dynamic Simulator) based on the LES(Large Eddy Simulation) was employed to clarify the isothermal mixing characteristic and wake flow pattern around bluff body. The air used atmosphere and the fuel used methane. The result of counter flow configuration shows that the flow field depends on air velocity but the mixing field is influenced on the fuel velocity. At low fuel velocity the fuel mole fraction is below the flammable limit and hence the mixing is insufficient to react. Therefore, as the result, the flame formed at low fuel velocity is characterized by non-premixed flames. For the flow field of co-flow configuration, flame stability was affected by fuel velocity as well as air velocity. the vortex generated by fuel stream has counter rotating direction against the air stream. Therefore, the momentum ratio between air and fuel stream was important to decide the flame blow out limit, which is result in the characteristic of the partially premixed reacting wake near extinction.
목차
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참고문헌 (16)
참고문헌 신청
I. Glassman / 2008 / Combustion / Elsevier
B. J Armstrong / 1987 / A Comparison of the Structure of the Wake Behind a Circular Cylinder in a Steady Flow with that in a Perturbed Flow / Physics of Fluid 30(1):19~26
S. J. Shanbhogue / 2009 / Lean Blowoff of Bluff Body Stabilized Flames: Scaling and Dynamics / Progress in Energy and Combustion Science 35:98~120
B. B. Dallya / 1996 / Measurements of NO in Turbulent Non-premixed Flames Stabilized on a Bluff Body / Proc. Combust. Inst. 26:2191~2197
A. Kempfa / 2006 / Largeeddy Simulation of a Bluff-body Stabilized Nonpremixed Flame / Combust and Flame 144:170~189
B. J Armstrong / 1987 / A Comparison of the Structure of the Wake Behind a Circular Cylinder in a Steady Flow with that in a Perturbed Flow / Physics of Fluid 30(1):19~26
S. J. Shanbhogue / 2009 / Lean Blowoff of Bluff Body Stabilized Flames: Scaling and Dynamics / Progress in Energy and Combustion Science 35:98~120
B. B. Dallya / 1996 / Measurements of NO in Turbulent Non-premixed Flames Stabilized on a Bluff Body / Proc. Combust. Inst. 26:2191~2197
A. Kempfa / 2006 / Largeeddy Simulation of a Bluff-body Stabilized Nonpremixed Flame / Combust and Flame 144:170~189
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